JP7533328B2 - Temperature measuring device and power transmission equipment physical quantity measuring device - Google Patents

Description

This disclosure relates to a temperature measuring device and a power transmission facility physical quantity measuring device.

To measure the temperature of the electric wire, a temperature measuring device may be attached to the electric wire (for example, Patent Document 1).

International Publication No. 2002/021088

The purpose of this disclosure is to provide technology that can stably measure the temperature of a connection.

According to one aspect of the present disclosure,
A temperature measuring device for measuring a temperature at a connection part having a polygonal cross section where an electric wire is compressed and connected,
a thermocouple including an exposed portion at which a pair of thermocouple wires are exposed;
a metal plate portion interposed between the thermocouple and the connection portion and arranged so as to be in direct contact with the connection portion;
Equipped with
the plate portion has a corrosion potential closer to a corrosion potential of the connection portion than a corrosion potential of each of the pair of thermocouple wires,
The plate portion is formed in a flat plate shape so as to be in surface contact with the outer circumferential surface of the connection portion.

According to another aspect of the present disclosure,
a temperature measuring unit for measuring a temperature of a connection portion having a polygonal cross section at which the electric wires are compressed and connected;
a power supply current transformer unit that is disposed so as to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field generated based on a current flowing through the electric wire;
a wireless unit connected to the temperature measurement unit and the power supply current transformer unit, and configured to wirelessly transmit temperature data of the connection unit measured by the temperature measurement unit to an external device using electric power from the power supply current transformer unit;
Equipped with
The temperature measuring unit is
a thermocouple including an exposed portion at which a pair of thermocouple wires are exposed;
a metal plate portion interposed between the thermocouple and the connection portion and arranged so as to be in direct contact with the connection portion;
Equipped with
the plate portion has a corrosion potential closer to a corrosion potential of the connection portion than a corrosion potential of each of the pair of thermocouple wires,
The plate portion is configured in a flat plate shape so as to come into surface contact with the outer circumferential surface of the connection portion.

According to this disclosure, the temperature of the connection can be measured stably.

FIG. 1 is a schematic perspective view showing a temperature measuring device according to a first embodiment of the present disclosure. FIG. 2 is a schematic cross-sectional view of the temperature measuring device taken along the axial direction of the thermocouple. FIG. 3 is an enlarged cross-sectional view of the plate portion and its surroundings. FIG. 4 is a schematic perspective view showing a power transmission facility physical quantity measuring device according to a second embodiment of the present disclosure. FIG. 5 is a block diagram showing a power transmission facility physical quantity measuring device according to the second embodiment of the present disclosure. FIG. 6 is a front view showing a power transmission facility physical quantity measuring device according to a second embodiment of the present disclosure. FIG. 7 is a left side view showing a power transmission facility physical quantity measuring device according to the second embodiment of the present disclosure. FIG. 8 is a bottom view showing a power transmission facility physical quantity measuring device according to the second embodiment of the present disclosure. FIG. 9 is a cross-sectional view taken along line AA in FIG. FIG. 10 is a cross-sectional view taken along line BB in FIG. FIG. 11 is a cross-sectional view taken along line CC of FIG. FIG. 12 is a schematic diagram showing a power supply current transformer section or a current measurement current transformer section. FIG. 13 is a front view showing a power transmission facility physical quantity measuring device according to a modified example of the second embodiment of the present disclosure. FIG. 14 is a left side view illustrating a power transmission facility physical quantity measuring device according to a modified example of the second embodiment of the present disclosure. FIG. 15 is a diagram showing the temperature measurement results of the example.

[Description of the embodiments of the present disclosure]
<Insights gained by the inventors>
First, the findings of the inventors will be described.

When measuring the temperature of power transmission equipment, in addition to measuring the temperature of the electric wires, it is also important to measure the temperature of the connections where the electric wires are connected. At the connections, current flows through the electrical contact surface between the electric wire and the connection. If the electrical contact surface is no longer in its normal condition due to deterioration over time, rainwater, salt damage, etc., electrical resistance will increase and the connection may become abnormally hot. If there is a connection in a power transmission line that is abnormally hot, the hot connection will cause problems in efficiently operating the entire power transmission line. For this reason, in addition to measuring the temperature of the electric wires, it is also important to measure the temperature of the connection.

Here, in temperature measurement devices that measure the temperature of electric wires and their connections, for example, IC (Integrated Circuit) temperature sensors have been used.

However, the applicable temperature for IC temperature sensors was 105°C or lower. The continuous use temperature of aluminum wire used as the metal strand of electric wires is generally 90°C, and while 105°C covers a practical range, the continuous use temperature could sometimes reach 230°C. For this reason, depending on the current flowing through the electric wire, it could be difficult to measure the temperature of the electric wire and the connection part using an IC temperature sensor.

In addition, the circuit board of the IC temperature sensor was housed in a metal housing, and the housing was filled with resin to make it waterproof. This meant that the volume of the housing that housed the circuit board of the IC temperature sensor was large, and the heat capacity of these components was also large. As a result, the accuracy of measuring the temperature of the wires and connections could decrease, and the ability of the wires and connections to follow temperature changes could decrease.

In response to this, the inventors considered using a thermocouple in a temperature measurement device.

By appropriately selecting the material that constitutes the pair of thermocouple wires in a thermocouple, it is expected that it will be possible to accurately measure the temperature of the wire and the connection up to the maximum operating temperature of the aluminum wire. In addition, by using a thermocouple, it is possible to eliminate the need for a large housing to house the circuit board of an IC temperature sensor. This is expected to make it possible to suppress the deterioration of the temperature measurement accuracy of the wire and the connection, and the deterioration of the response to temperature changes of the wire and the connection, caused by the thermal capacity of the housing.

However, the inventors discovered that the use of thermocouples creates the following new problems:

The thermocouple is, for example, placed in direct contact with the electric wire and the connection. In this case, due to the difference between the corrosion potential of the electric wire and the connection and the corrosion potential of each of the pair of thermocouple elements, there is a possibility that electrolytic corrosion (corrosion caused by contact between dissimilar metals: galvanic corrosion) may occur in at least one of the electric wire and the connection and the pair of thermocouple elements. If electrolytic corrosion occurs in these, there is a possibility that the accuracy of temperature measurement by the thermocouple may gradually decrease. In addition, there is a risk that the mechanical and electrical properties of the electric wire and the connection themselves may decrease. As a result, it becomes difficult to stably measure the temperature of the electric wire and the connection, and there is a possibility that the electric wire and the connection may be damaged.

When measuring the temperature of a connection where electric wires are connected, the thermocouple is attached to the connection by, for example, a band-shaped bundling part. However, because linear thermocouples of different thicknesses are attached to a connection with a hexagonal cross section, even if the connection and thermocouple are fastened by the bundling part, a gap is likely to occur between the connection and the thermocouple, and they can easily become misaligned. For this reason, it may not be possible to stably maintain the position of the thermocouple's temperature measurement junction (temperature sensing part). As a result, there is a risk that the measured temperature of the connection will fluctuate due to changes in the temperature measurement position.

This disclosure is based on the above-mentioned new problem discovered by the inventors.

<Embodiments of the present disclosure>
Next, embodiments of the present disclosure will be listed and described.

[1] A temperature measuring device according to one aspect of the present disclosure,
A temperature measuring device for measuring a temperature at a connection part having a polygonal cross section where an electric wire is compressed and connected,
a thermocouple including an exposed portion at which a pair of thermocouple wires are exposed;
a metal plate portion interposed between the thermocouple and the connection portion and arranged so as to be in direct contact with the connection portion;
Equipped with
the plate portion has a corrosion potential closer to a corrosion potential of the connection portion than a corrosion potential of each of the pair of thermocouple wires,
The plate portion is formed in a flat plate shape so as to be in surface contact with the outer circumferential surface of the connection portion.
According to this configuration, it is possible to stably measure the temperature of the connection portion.

[2] In the temperature measuring device according to the above [1],
a block portion that holds the thermocouple together with the plate portion;
a bundling portion bundling the connection portion, the plate portion, the thermocouple, and the block portion together;
Equipped with
The block portion has an engagement groove with which the binding portion engages.
This configuration can prevent the binding portion from coming off the block portion.

[3] In the temperature measuring device according to the above [2],
The block portion has an insertion groove into which the thermocouple is inserted on the side facing the plate portion.
With this configuration, it is possible to suppress misalignment of the thermocouple.

[4] In the temperature measuring device according to the above [2] or [3],
The bundling portion is provided in plurality,
The engagement groove is provided in a plurality of grooves so that the binding portions can be engaged with each other,
One of the plurality of engagement grooves is provided at a position overlapping the exposed portions of the pair of thermocouple wires.
According to this configuration, the exposed portions of the pair of thermocouple wires can be pressed against the connecting portion by fastening the bundling portion.

[5] In the temperature measuring device according to any one of [1] to [4] above,
The thermocouple further includes a resin layer that covers the exposed portions of the pair of thermocouple wires in a state where the exposed portions are in contact with the plate portion.
According to this configuration, the occurrence of electrolytic corrosion between the thermocouple wires and the plate portion can be suppressed.

[6] In the temperature measuring device according to any one of [1] to [5] above,
The plate portion is
A first piece portion is arranged so as to be in direct contact with the electric wire;
a second piece portion that, together with the first piece portion, sandwiches the exposed portions of the pair of thermocouple wires;
has.
According to this configuration, it is possible to suppress misalignment of the pair of thermocouple wires with respect to the plate portion.

[7] The temperature measuring device according to the above [6],
The second piece is connected to one end of the first piece in a surface direction.
According to this configuration, it is possible to suppress misalignment between the first arm and the second arm.

[8] A power transmission facility physical quantity measuring device according to another aspect of the present disclosure,
a temperature measuring unit for measuring a temperature of a connection portion having a polygonal cross section at which the electric wires are compressed and connected;
a power supply current transformer unit that is disposed so as to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field generated based on a current flowing through the electric wire;
a wireless unit connected to the temperature measurement unit and the power supply current transformer unit, and configured to wirelessly transmit temperature data of the connection unit measured by the temperature measurement unit to an external device using electric power from the power supply current transformer unit;
Equipped with
The temperature measuring unit is
a thermocouple including an exposed portion at which a pair of thermocouple wires are exposed;
a metal plate portion interposed between the thermocouple and the connection portion and arranged so as to be in direct contact with the connection portion;
Equipped with
the plate portion has a corrosion potential closer to a corrosion potential of the connection portion than a corrosion potential of each of the pair of thermocouple wires,
The plate portion is formed in a flat plate shape so as to be in surface contact with the outer circumferential surface of the connection portion.
According to this configuration, it is possible to stably measure the temperature of the connection portion.

[Details of the embodiment of the present disclosure]
Next, embodiments of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

First Embodiment of the Present Disclosure
(1) Temperature Measuring Device A temperature measuring device 200 according to a first embodiment of the present disclosure will be described with reference to Figs. 1 to 3. Fig. 1 is a schematic perspective view showing a temperature measuring device according to this embodiment. Fig. 2 is a schematic cross-sectional view of the temperature measuring device along the axial direction of the thermocouple. Fig. 3 is an enlarged cross-sectional view of the vicinity of the plate portion. Note that Figs. 1 to 3 show a state opposite to the actual mounting state in the vertical direction. Fig. 1 shows a cross-sectional view of a part of the connection portion 180. In Figs. 2 and 3, the cross-sectional structure of the connection portion 180 is omitted. In Figs. 2 and 3, the thermocouple 220 is shown in a side view rather than in a cross section.

In the following, the "axial direction" of the thermocouple 220 refers to the direction along the central axis of the thermocouple 220, and in some cases can be rephrased as the longitudinal direction of the thermocouple 220.

As shown in Figures 1 to 3, the temperature measuring device 200 of this embodiment is configured to measure the temperature at, for example, a connection portion 180 having a polygonal cross section that compresses and connects the electric wire 100. Specifically, the temperature measuring device 200 includes, for example, a thermocouple 220, a resin layer 230, a plate portion 240, a block portion 260, and a bundling portion 280.

(Electric wires and connections)
In this embodiment, the electric wire 100 is configured as, for example, a so-called overhead transmission line. That is, the electric wire 100 has, for example, a plurality of metal wires in the outermost layer.

Specifically, the electric wire 100 is, for example, a steel core aluminum stranded wire (ACSR). The electric wire 100 has, for example, a central portion that bears tension during stringing, and a stranded wire layer that is configured as a conductor for carrying current during power transmission and is formed by twisting together a number of metal strands to cover the outer periphery of the central portion. The strands that make up the central portion are, for example, aluminum-clad steel wires (AC wires). The metal strands that make up the stranded wire layer contain, for example, aluminum (Al) or an Al alloy.

The connection part 180 to be measured is configured as, for example, a so-called compression connection tube that compresses and connects the electric wire 100. Examples of compression connection tubes include a compression-type retention clamp and a straight sleeve. A compression-type retention clamp is a metal fitting that physically and electrically connects the electric wire 100 and holds it to a steel tower or the like. A straight sleeve is a metal fitting that physically and electrically connects a pair of electric wires 100 together.

The connection part 180 has a polygonal cross section. Specifically, the cross-sectional shape of the connection part 180 is, for example, a hexagon. Therefore, the connection part 180 has six flat outer peripheral surfaces.

The connection part 180 is made of the same material as the metal wire of the electric wire 100 to be connected. Specifically, the connection part 180 contains, for example, Al or an Al alloy.

(Thermocouple)
2 and 3, the thermocouple 220 is configured as, for example, a so-called insulated thermocouple. Specifically, the thermocouple 220 has, for example, a pair of thermocouple wires 222, an insulating layer 224, and a shield portion (shielding layer) 226. The thermocouple 220 is, for example, peeled off stepwise from the tip to the opposite side in the axial direction.

The pair of thermocouple wires 222 contain, for example, different metal materials. Specifically, the thermocouple 220 is configured as, for example, a K thermocouple. That is, of the pair of thermocouple wires 222, the + leg thermocouple wire 222 contains nickel (Ni)-Cr alloy (chromel) containing 10% chromium (Cr), and the - leg thermocouple wire 222 contains Ni alloy (alumel) containing Al and manganese (Mn). With this configuration, the measurement temperature range can be set to -270°C or more and 1372°C or less. This makes it possible to accurately measure temperature even with a connection part 180 that connects an electric wire 100 having a metal wire such as a special heat-resistant aluminum alloy wire (XTAI) with a maximum operating temperature of 230°C.

The tips of the pair of thermocouple wires 222 are connected (joined) to each other, for example, by welding. The connected tips become what is called a temperature measurement junction. For example, a measuring instrument (not shown) having a temperature compensation circuit is connected to the end opposite the temperature measurement junction. By measuring the thermoelectromotive force generated between the pair of thermocouple wires 222 with the measuring instrument, the temperature at the temperature measurement junction can be measured (calculated).

The insulating layer 224 includes, for example, an insulating material and covers the outer circumference of the pair of thermocouple wires 222. In this embodiment, the insulating layer 224 has, for example, an inner insulating layer 224a and an outer insulating layer (outer sheath) 224b. The inner insulating layer 224a covers, for example, the outer circumference of each of the pair of thermocouple wires 222. The outer insulating layer 224b covers, for example, the outer circumference of the inner insulating layer 224a. Examples of materials constituting each of the inner insulating layer 224a and the outer insulating layer 224b include polyvinyl chloride, polyethylene, silicone rubber, fluororesin, glass fiber, and ceramic fiber.

Here, the thermocouple 220 includes an exposed portion EP where the pair of thermocouple wires 222 are exposed from the insulating layer 224, for example, over a predetermined length from the tip that constitutes the temperature measurement junction. In this embodiment, as described below, the state around the exposed portion EP of the pair of thermocouple wires 222 is important from the viewpoint of improving the temperature measurement accuracy and suppressing electrolytic corrosion.

The shield section 226 includes, for example, a braided wire that covers the outer periphery of the insulating layer 224. In this embodiment, the shield section 226 covers, for example, a portion of the insulating layer 224 that extends outward beyond the plate section 240 described below. With this configuration, the pair of thermocouple wires 222 can be shielded by the shield section 226. This makes it possible to suppress the generation of noise due to the thermoelectromotive force of the pair of thermocouple wires 222 when an electromagnetic field is generated around the connection section 180 based on the current flowing through the electric wire 100. As a result, the temperature measurement accuracy can be improved.

As shown in FIG. 1, the outer circumference of the shield portion 226 may be covered with aluminum tape 228.

(Plate portion and resin layer)
The plate portion 240 is configured as, for example, a metal plate-like member. For example, the plate portion 240 is disposed between the connection portion 180 and the thermocouple 220 so as to be in direct contact with the connection portion 180. In addition, the plate portion 240 supports, for example, at least a part of the thermocouple 220 including the exposed portion EP. With this configuration, the heat of the connection portion 180 is transferred to the thermocouple 220 via the plate portion 240. In addition, by making the plate portion 240 into a thin plate shape, the heat taken from the connection portion 180 as the object to be measured is kept to a minimum, and the temperature of the connection portion 180 can be measured with high accuracy.

In this embodiment, the corrosion potential of the plate portion 240 is closer to the corrosion potential of the connection portion 180 than the corrosion potential of each of the pair of thermocouple wires 222. With this configuration, the corrosion potential difference between the connection portion 180 and the plate portion 240, which are in direct contact with each other, can be reduced. This makes it possible to suppress the occurrence of electrolytic corrosion in the connection portion 180 or the plate portion 240.

Specifically, for example, when a saturated calomel electrode (SCE) is used as the reference potential, the corrosion potential of the Al or Al alloy contained in the connection portion 180 is approximately -1.0 to -0.75 (V vs. SCE), and the corrosion potential of the Ni contained in the thermocouple wire 222 is approximately -0.2 to -0.1 (V vs. SCE). Therefore, the corrosion potential of the plate portion 240 is, for example, -1.0 to less than -0.2, preferably -1.0 to -0.4, more preferably -1.0 to -0.6 (V vs. SCE).

Furthermore, in this embodiment, it is preferable that the plate portion 240 contains, for example, the same metal as the connection portion 180. That is, it is preferable that the plate portion 240 contains, for example, Al or an Al alloy. This can reliably bring the corrosion potential of the plate portion 240 close to the corrosion potential of the connection portion 180.

In addition, in this embodiment, the plate portion 240 is configured, for example, in a flat plate shape so as to be in surface contact with the flat outer peripheral surface of the connection portion 180. The plate portion 240 is configured, for example, in a long plate shape along the outer peripheral surface of the connection portion 180. This makes it possible to increase the contact area of the plate portion 240 with the connection portion 180. As a result, it is possible to improve the temperature measurement accuracy.

[Resin layer]
3, for example, the resin layer 230 covers the exposed portions EP of the pair of thermocouple wires 222 in a state in which the exposed portions EP are in contact with the plate portion 240. This makes it possible to suppress intrusion of water from the outside and to protect the exposed portions EP of the pair of thermocouple wires 222. As a result, even if the thermocouple wires 222 and the plate portion 240 made of different metals are in contact with each other, it is possible to suppress the occurrence of electrical corrosion between the thermocouple wires 222 and the plate portion 240.

The resin constituting the resin layer 230 preferably has, for example, waterproofness (resistance to water immersion), heat resistance, cold resistance, and adhesiveness to the thermocouple wire 222 and the plate portion 240. Specifically, examples of the resin constituting the resin layer 230 include silicone rubber and epoxy resin. The silicone rubber is preferably, for example, a room temperature vulcanizing (RTV) type. The curing type may be a one-component type or a two-component type.

[Two-piece structure]
In this embodiment, the plate portion 240 has a two-piece structure, for example, a first piece 242 and a second piece 244 .

The first piece 242 performs the main function of the plate portion 240, and is, for example, disposed between the connection portion 180 and the thermocouple 220 and in direct contact with the connection portion 180. The first piece 242 supports, for example, a portion of the thermocouple 220. This makes it possible to prevent direct contact between the connection portion 180 and the pair of thermocouple wires 222.

The second piece 244, for example, sandwiches the exposed portions EP of the pair of thermocouple wires 222 covered with the resin layer 230 together with the first piece 242. In other words, the second piece 244 is provided on the opposite side of the thermocouple 220 from the first piece 242, and covers the exposed portions EP of the pair of thermocouple wires 222. This makes it possible to suppress misalignment of the pair of thermocouple wires 222 with respect to the plate portion 240. It also makes it possible to suppress contact between the exposed portions EP of the pair of thermocouple wires 222 and the outside air.

The length of the first arm 242 in the axial direction of the thermocouple 220 is, for example, longer than the length of the second arm 244. The first arm 242 extends, for example, outward from the second arm 244 and supports a part of the thermocouple 220 over a longer range than the second arm 244. This allows the portion where the first arm 242 and the second arm 244 clamp the exposed portions EP of the pair of thermocouple wires 222 to be away from the step between the end of the first arm 242 and the electric wire 100. As a result, it is possible to suppress the application of a force that would cause the exposed portions EP of the pair of thermocouple wires 222 to slip out of the first arm 242 and the second arm 244 due to the step.

In this embodiment, the exposed portions EP of the pair of thermocouple wires 222 covered with the resin layer 230 are inserted between the first arm 242 and the second arm 244. Between the first arm 242 and the second arm 244, the gap excluding the exposed portions EP of the pair of thermocouple wires 222 is densely filled with the above-mentioned resin layer 230. This makes it possible to suppress the intrusion of outside air or moisture between the first arm 242 and the second arm 244.

In addition, in this embodiment, the second piece 244 is connected, for example, to one end of the first piece 242 in the surface direction. Specifically, the plate portion 240 is formed by folding back a single plate-like member to form the first piece 242 and the second piece 244. That is, the second piece 244 is connected to the first piece 242, for example, along the entire side at one end of the first piece 242 in the surface direction. This makes it possible to suppress misalignment between the first piece 242 and the second piece 244.

The side where the first piece 242 and the second piece 244 are connected is preferably, for example, not an adjacent side connected to the side where the exposed portions EP of the pair of thermocouple wires 222 are inserted, but an opposite side to the side where the exposed portions EP are inserted. This makes it possible to easily insert the exposed portions EP of the pair of thermocouple wires 222 between the first piece 242 and the second piece 244.

In this embodiment, the width in the short side direction of the first piece 242 is, for example, shorter than the width in the short side direction of one outer peripheral surface of the connection portion 180 (the length of one side of the hexagonal cross section). This allows the entire lower surface of the first piece 242 to abut against one outer peripheral surface of the connection portion 180. The width in the short side direction of the second piece 244 is equal to the width in the short side direction of the first piece 242.

In this embodiment, the thickness of each of the first piece 242 and the second piece 244 constituting the plate portion 240 is, for example, 0.3 mm or more and 0.5 mm or less. By making each thickness 0.3 mm, the rigidity of the plate portion 240 can be sufficiently ensured. On the other hand, by making each thickness 0.5 mm or less, the workability of the plate portion 240 can be improved.

(Block section)
The block portion 260, for example, sandwiches the thermocouple 220 together with the plate portion 240. The block portion 260 is configured, for example, in an elongated shape. The block portion 260 covers a part of the thermocouple 220 and the plate portion 240 along the axial direction of the thermocouple 220 (the longitudinal direction of the plate portion 240) on the opposite side of the plate portion 240 with the thermocouple 220 sandwiched therebetween.

The block portion 260 has a flat outer peripheral surface that corresponds to, for example, a portion of each of the six faces of a rectangular parallelepiped. In a cross section perpendicular to the axial direction of the thermocouple 220, the shape of the block portion 260 is a rectangle.

On the other hand, the block portion 260 has, for example, multiple groove portions (262, 264).

The block portion 260 has, for example, an insertion groove 264 on the side facing the plate portion 240, into which the thermocouple 220 is inserted. The thermocouple 220 is fitted into the insertion groove 264. This makes it possible to suppress displacement of the thermocouple 220. In addition, the thermocouple 220 can be hidden within the block portion 260. This makes it possible to abut the lower surface of the block portion 260, excluding the insertion groove 264, against the upper surface of the plate portion 240, while suppressing the occurrence of a gap between the plate portion 240 and the block portion 260.

The insertion groove 264 is provided, for example, along the longitudinal direction of the block portion 260 from the end of the block portion 260 to the center of the block portion 260. The inner circumferential surface of the insertion groove 264 near the center of the block portion 260 is curved so as to cover the exposed portions EP of the pair of thermocouple wires 222. This allows the thermocouple 220 to be fitted into the insertion groove 264 of the block portion 260 in accordance with the stepped stripping shape of the thermocouple 220.

In this embodiment, it is preferable that the resin layer 234 is densely filled in the gaps of the insertion groove 264 excluding the thermocouple 220 and the plate portion 240. The resin layer 234 bonds the plate portion 240, the thermocouple 220, and the block portion 260 to each other. The resin constituting the resin layer 234 is, for example, the same as the resin constituting the resin layer 230. With this configuration, it is possible to suppress the intrusion of outside air and moisture into the insertion groove 264. In addition, it is possible to suppress the displacement (rattle) of the thermocouple 220 in the insertion groove 264.

Furthermore, in this embodiment, the lower surface of the block portion 260 and the upper surface of the plate portion 240 are preferably bonded, for example, via a resin layer 234. This makes it possible to suppress the mutual misalignment of the block portion 260 and the plate portion 240. As a result, the positions of the temperature measurement junctions of the pair of thermocouple wires 222 can be stably maintained.

The block portion 260 also has an engagement groove 262 that engages with a binding portion 280 that binds the connection portion 180, the plate portion 240, the thermocouple 220, and the block portion 260 together, as described below. The engagement groove 262 is provided on the side of the block portion 260 opposite the plate portion 240. This makes it possible to prevent the binding portion 280 from coming off the block portion 260. As a result, the temperature measuring device 200 can be firmly attached to the connection portion 180, which has a polygonal cross section.

The block portion 260 is provided with, for example, a number of engagement grooves 262 so that the binding portions 280 can respectively engage with the respective binding portions 280. In this embodiment, for example, at least three engagement grooves 262 are provided. The three engagement grooves 262 are referred to as a first engagement groove 262a, a second engagement groove 262b, and a third engagement groove 262c.

Specifically, the second engagement groove 262b is provided, for example, at a position overlapping the exposed portions EP of the pair of thermocouple wires 222. That is, the second engagement groove 262b is provided, for example, at a position overlapping the end of the insertion groove 264 in the center of the block portion 260. By fastening the second bundling portion 280b (described later) that engages with the second engagement groove 262b, the exposed portions EP of the pair of thermocouple wires 222 can be pressed against the connection portion 180.

The first engagement groove 262a and the third engagement groove 262c are provided, for example, on opposite sides of the second engagement groove 262b. That is, the first engagement groove 262a is provided near the first end of the block portion 260 in the longitudinal direction, and the third engagement groove 262c is provided near the second end of the block portion 260 in the longitudinal direction.

Specific dimensions of the block portion 260 are not particularly limited, but examples include the following dimensions:

The longitudinal length of the block portion 260 (the length of the block portion 260 in the axial direction of the thermocouple 220) is, for example, equal to the longitudinal length of the plate portion 240. The lateral width of the block portion 260 is, for example, equal to or less than the lateral width of the plate portion 240. The thickness of the block portion 260 is, for example, greater than the thickness of each of the first piece 242 and the second piece 244 of the plate portion 240. With this configuration, the bundling portion 280 can be used to fasten the block portion 260 to the connection portion 180 having a polygonal cross section.

The width of the engagement groove 262 in the longitudinal direction of the block portion 260 is preferably, for example, about +2 mm relative to the width of the binding portion 280 in the lateral direction. This makes it possible to easily engage the binding portion 280 in the engagement groove 262 while preventing the binding portion 280 from coming off the block portion 260.

In this embodiment, it is preferable that the shield portion 226 of the thermocouple 220 is connected to at least one of the block portion 260 and the first piece 242. This allows the shield portion 226 of the thermocouple 220 to be at the same potential as the connection portion 180 via the block portion 260 and the first piece 242.

(Bundle section)
The bundling section 280 bundles together, for example, the connection section 180, the plate section 240, the thermocouple 220, and the block section 260. This allows the temperature measuring device 200 to be firmly attached to the connection section 180.

The binding portion 280 is configured, for example, as a band-shaped so-called cable tie. Examples of the binding portion 280 include Insulock (registered trademark) manufactured by HellermannTyton. This makes it easy to attach the temperature measuring device 200 to the electric wire 100.

In this embodiment, the number of binding parts 280 is the same as the number of engagement grooves 262 of the block part 260, i.e., three binding parts are provided. The three binding parts 280 are a first binding part 280a, a second binding part 280b, and a third binding part 280c.

The first bundling portion 280a, for example, engages with the first engagement groove 262a described above. The first bundling portion 280a, for example, bundles together the connection portion 180, the portion where the first piece 242 and the second piece 244 overlap without the thermocouple 220, and the block portion 260.

The second bundling portion 280b, for example, engages with the second engagement groove 262b described above. The second bundling portion 280b, for example, bundles together the connection portion 180, the portion where the first piece 242 and the second piece 244 sandwich the exposed portions EP of the pair of thermocouple wires 222, and the block portion 260.

The third bundling portion 280c, for example, engages with the third engagement groove 262c described above. The third bundling portion 280c, for example, bundles together the connection portion 180, the first piece portion 242, the thermocouple 220, and the block portion 260.

The first binding portion 280a, the second binding portion 280b, and the third binding portion 280c allow the temperature measuring device 200 to be fixed firmly and in a well-balanced manner to the connection portion 180.

(Location of temperature measuring device)
1 to 3, the temperature measuring device 200 is shown vertically above the connection part 180, but in practice, it is preferable to place it vertically below the connection part 180. This makes it possible to suppress a rise in temperature of the temperature measuring device 200 itself due to solar radiation. Also, it is possible to suppress interference with workers working on the electric wire 100 and the connection part 180.

(2) Effects of the Present Embodiment According to the present embodiment, one or more of the following effects can be obtained.

(a) The plate portion 240 is disposed between the connection portion 180 and the thermocouple 220 and in direct contact with the connection portion 180. This makes it possible to prevent direct contact between the pair of thermocouple wires 222 and the connection portion 180.

In addition, the corrosion potential of the plate portion 240 is closer to the corrosion potential of the connection portion 180 than the corrosion potential of each of the pair of thermocouple wires 222. With this configuration, the corrosion potential difference between the connection portion 180 and the plate portion 240, which are in direct contact with each other, can be reduced. This makes it possible to suppress the occurrence of electrolytic corrosion in the connection portion 180 or the plate portion 240.

(b) The plate portion 240 is configured, for example, in a flat plate shape so as to be in surface contact with the flat outer peripheral surface of the connection portion 180. This allows the plate portion 240 to abut against the flat outer peripheral surface of the connection portion 180 without any gaps. In other words, the contact area of the plate portion 240 with the connection portion 180 can be increased. By increasing the contact area of the plate portion 240, heat from the connection portion 180 can be efficiently transferred to the thermocouple 220 via the plate portion 240. As a result, the temperature measurement accuracy of the connection portion 180 can be improved.

As a result of (a) and (b), it becomes possible to stably measure the temperature of the connection part 180.

(c) The block portion 260 has an engagement groove 262 that engages with the binding portion 280 that binds the connection portion 180, the plate portion 240, the thermocouple 220, and the block portion 260 together. This makes it possible to prevent the binding portion 280 from coming off the block portion 260. As a result, the temperature measuring device 200 can be firmly attached to the connection portion 180, which has a polygonal cross section.

In addition, when the temperature measuring device 200 is placed vertically below the connection part 180, the block part 260 has an engagement groove 262, so that the worker can grasp the binding position of the binding part 280 by touching the engagement groove 262 of the block part 260 with his/her hand without visually checking the block part 260. As a result, the temperature measuring device 200 can be quickly and reliably attached to the connection part 180.

(d) The block portion 260 is provided with a plurality of engagement grooves 262 for engaging with the respective bundling portions 280. Of the plurality of engagement grooves 262, the second engagement groove 262b is provided at a position overlapping with the exposed portion EP of the pair of thermocouple wires 222. By fastening the second bundling portion 280b that engages with the second engagement groove 262b, the exposed portion EP of the pair of thermocouple wires 222 can be pressed against the connection portion 180. This allows heat from the connection portion 180 to be efficiently transferred toward the thermocouple 220. As a result, the temperature measurement accuracy of the connection portion 180 can be stably improved.

(e) The block portion 260 has an insertion groove 264 on the side facing the plate portion 240, into which the thermocouple 220 is inserted. This can suppress misalignment of the thermocouple 220. In addition, the thermocouple 220 can be hidden within the block portion 260. This can suppress the occurrence of gaps between the plate portion 240 and the block portion 260, while allowing the lower surface of the block portion 260, excluding the insertion groove 264, to abut against the upper surface of the plate portion 240. By suppressing the occurrence of gaps in this way, it is possible to suppress the intrusion of outside air and moisture between the plate portion 240 and the block portion 260. As a result, it is possible to suppress the occurrence of electrical corrosion in the pair of thermocouple wires 222 sandwiched between them.

(f) The resin layer 230 covers the exposed portions EP of the pair of thermocouple wires 222 while the exposed portions EP are in contact with the plate portion 240. This makes it possible to prevent water from entering from the outside and to protect the exposed portions EP of the pair of thermocouple wires 222. As a result, even if the thermocouple wires 222 and the plate portion 240, which are made of different metals, are in contact with each other, it is possible to prevent the occurrence of electrical corrosion between the thermocouple wires 222 and the plate portion 240. In other words, it is possible to maintain the temperature measuring device 200 and the connection portion 180 in a state in which the temperature of the connection portion 180 can be stably measured.

(g) The first arm 242 and the second arm 244 sandwich the exposed portion EP of the pair of thermocouple wires 222 covered with the resin layer 230. This makes it possible to suppress misalignment of the pair of thermocouple wires 222 relative to the plate portion 240. By suppressing the misalignment of the pair of thermocouple wires 222, the position of the temperature measurement junction of the pair of thermocouple wires 222 can be stably maintained. As a result, fluctuations in the measured temperature of the electric wire 100 caused by changes in the temperature measurement position can be suppressed.

(h) The second arm 244 is connected to one end of the first arm 242 in the surface direction. This makes it possible to suppress misalignment between the first arm 242 and the second arm 244. As a result, the first arm 242 and the second arm 244 can stably maintain the state in which they sandwich the exposed portions EP of the pair of thermocouple wires 222.

In addition, because the first arm 242 and the second arm 244 are connected, the intrusion of outside air or moisture between the first arm 242 and the second arm 244 can be suppressed at the connection between them. As a result, the occurrence of electrolytic corrosion in at least one of the pair of thermocouple wires 222 and the plate portion 240 can be suppressed within the plate portion 240.

Second Embodiment of the Present Disclosure
(1) Power Transmission Facility Physical Quantity Measuring Device A power transmission facility physical quantity measuring device 10 according to a second embodiment of the present disclosure will be described with reference to Figs. 4 to 12. Figs. 4 to 8 are a schematic perspective view, a block diagram, a front view, a left side view, and a bottom view, respectively, showing a power transmission facility physical quantity measuring device according to the present embodiment. Figs. 9 and 10 are cross-sectional views taken along line A-A in Fig. 6 and line B-B in Fig. 6, respectively. Fig. 11 is a cross-sectional view taken along line C-C in Fig. 7. Fig. 12 is a schematic view showing a power supply current transformer section or a current measurement current transformer section. Note that in the figures other than Fig. 5, wiring connecting each section is omitted. Also, in Figs. 6 to 11, the electric wire 100 is omitted. Also, in Figs. 9 and 10, fixing members for fixing each section are omitted.

In the following, the "axial direction" of the electric wire 100 or the power transmission facility physical quantity measuring device 10 refers to the direction along the central axis of the electric wire 100, the first electric wire insertion hole 311, the second electric wire insertion hole 321, or the electric wire insertion hole 710, and in some cases can be rephrased as the longitudinal direction of the electric wire 100 or the power transmission facility physical quantity measuring device 10. The "axial direction" of the power supply core 422 or the measurement core 522 refers to the direction along the central axis of the arc formed by the power supply core 422 or the measurement core 522. The "cross-sectional central axis" of the power supply core 422 or the measurement core 522 refers to the axis located at the center of a cross section perpendicular to the circumferential direction of the arc forming the power supply core 422 or the measurement core 522. In addition, the "radial direction" of the electric wire 100 or the power transmission facility physical quantity measuring device 10 refers to a direction perpendicular to the axial direction of the electric wire 100, the first electric wire insertion hole 311, the second electric wire insertion hole 321, or the electric wire insertion hole 710, and in some cases can be rephrased as the short side direction of the electric wire 100 or the power transmission facility physical quantity measuring device 10. In addition, the "circumferential direction" of the electric wire 100 or the power transmission facility physical quantity measuring device 10 refers to a direction along the outer periphery of the electric wire 100, or a direction along the inner periphery of the first electric wire insertion hole 311, the second electric wire insertion hole 321, or the electric wire insertion hole 710.

In addition, in each figure, the "X direction" refers to the direction perpendicular to the axial direction of the electric wire 100 and the horizontal direction, and when viewed from the first accommodating section 310 toward the second accommodating section 320, the rightward direction is the "+X direction". In addition, the "Y direction" refers to the axial direction of the electric wire 100 and the horizontal direction, and the direction from the first accommodating section 310 toward the second accommodating section 320 is the "+Y direction". In addition, the "Z direction" refers to the vertical direction, and the vertically upward direction is the "+Z direction".

As shown in Figures 4 to 12, the power transmission equipment physical quantity measuring device 10 of this embodiment is configured to be attached to, for example, an electric wire 100 and measure the physical quantity of the power transmission equipment. Specifically, the power transmission equipment physical quantity measuring device 10 has, for example, a power supply current transformer section (power supply CT section, power generation CT section) 420, a power supply section (power supply circuit) 440, a current measurement current transformer section (current measurement CT section) 520, a current measurement section (current measurement circuit) 540, a temperature measurement section (temperature measurement device) 200, a wireless section (transmitter/receiver section, communication section) 600, a first storage section 310, a second storage section 320, and a clamp (gripping section) 700.

(Power supply current transformer section)
5, 9, 10 and 12, the power supply CT unit 420 is disposed, for example, in a ring shape so as to surround the electric wire 100. The power supply CT unit 420 is configured, for example, to generate electric power by electromagnetic induction from a magnetic field generated around the electric wire 100 based on a current flowing through the electric wire 100.

Specifically, as shown in FIG. 12, the power supply CT unit 420 of this embodiment has, for example, a power supply core 422 and a power supply coil 424. The power supply core 422 is arranged, for example, in an annular shape (circular arc shape, elliptical arc shape) so as to surround the outer periphery of the electric wire 100. The power supply core 422 also includes a magnetic material. The magnetic material constituting the power supply core 422 is, for example, ferrite. The power supply coil 424 is wound around at least a part of the power supply core 422. With this configuration, an induced current can be generated in the power supply coil 424 by electromagnetic induction based on a change in magnetic flux generated in the power supply core 422 around the electric wire 100 by a current flowing through the electric wire 100.

In this embodiment, the power core 422 is, for example, split in half along the axial direction. Here, "split in half along the axial direction" refers to being split into two by a plane that includes the central axis of the arc formed by the power core 422, or a plane parallel to the central axis. The "plane" here is not limited to one, but may be a combination of two or more planes. In addition, the "plane parallel to the axis" here is not limited to a plane that is completely parallel to the central axis of the arc formed by the power core 422, but may be a plane that is inclined with respect to the central axis with a certain error. Below, the definition of "split in half along the axial direction" for other members is the same as the above definition.

For example, of the pair of power supply half cores obtained by splitting the power supply core 422 in half along the axial direction, the power supply half core arranged vertically on the lower side is referred to as the "lower power supply half core 423d," and the power supply half core arranged vertically on the upper side is referred to as the "upper power supply half core 423u." The arrangement of the power supply core 422 within the first housing section 310 will be described in detail later.

(Power supply section)
5, the power supply unit 440 is configured to be connected to the power supply CT unit 420, for example, and to convert the power generated by the power supply CT unit 420 into power suitable for the wireless unit 600 described below and supply the power to the wireless unit 600. Specifically, the power supply unit 440 is configured to convert the AC power generated by the power supply CT unit 420 into DC power suitable for the wireless unit 600. The power supply unit 440 is also configured to transform the voltage generated by the power supply CT unit 420 into a voltage suitable for the wireless unit 600.

(Measurement current transformer section)
5, 9, 10, and 12, the current measuring CT unit 520 is disposed, for example, in a ring shape so as to surround the electric wire 100. The current measuring CT unit 520 is configured, for example, to output an induced voltage corresponding to the current flowing through the electric wire 100.

Specifically, as shown in FIG. 12, the current measuring CT section 520 of this embodiment is configured in a manner similar to the power supply CT section 420 described above, and includes, for example, a measuring core 522 and a measuring coil 524. With this configuration, an induced voltage can be generated in the measuring coil 524 by electromagnetic induction based on a change in magnetic flux generated in the measuring core 522 around the electric wire 100 by the current flowing through the electric wire 100.

The measurement core 522 of this embodiment is, for example, split in half along the axial direction, similar to the power supply core 422. For example, of the pair of measurement half cores obtained by splitting the measurement core 522 in half along the axial direction, the measurement half core arranged vertically on the lower side is referred to as the "measurement lower half core 523d" and the measurement half core arranged vertically on the upper side is referred to as the "measurement upper half core 523u."

As shown in Figures 9 and 10, the measurement core 522 of this embodiment is larger than the power supply core 422 so that, for example, a large current can be measured. Specifically, the measurement core 522 has, for example, at least two unit cores (reference numbers not shown) connected in the axial direction of the arc formed by the measurement core 522. The size of one of the unit cores of the measurement core 522 is, for example, equal to or larger than the size of the power supply core 422.

The two unit cores that make up the measurement core 522 have traces of being split in half along the axial direction after being glued together via an adhesive layer (not shown) with the central axes of the arcs aligned with each other. Specific traces, for example, are that the two unit cores and the adhesive layer have cut surfaces (half surfaces) that form the same surface. With the above-mentioned configuration, when the measurement lower half core 523d and the measurement upper half core 523u are joined, the cross-sectional central axes of the two unit cores can be simultaneously and easily aligned and this state can be stably maintained.

The arrangement of the measurement core 522 within the second housing section 320 will be described in detail later.

(Current measuring section)
5, the current measuring unit 540 is configured to be connected to the current measuring CT unit 520, for example, and to measure the current flowing through the electric wire 100 based on the induced voltage output by the current measuring CT unit 520. Hereinafter, information related to the current of the electric wire 100 measured by the current measuring unit 540 will be referred to as "current data."

(Temperature measurement section)
4 and 5, the temperature measurement unit 200 is configured as, for example, the temperature measurement device 200 of the first embodiment described above. The same reference numerals are used for these. Hereinafter, information related to the temperature of the connection unit 180 measured by the temperature measurement unit 200 will be referred to as "temperature data."

(Radio section)
The wireless unit 600 is configured to, for example, communicate predetermined information. In this embodiment, the wireless unit 600 is configured to, for example, wirelessly transmit information related to a physical quantity of the power transmission facility, such as a current in the electric wire 100, to an external device.

Specifically, as shown in FIG. 5, the wireless unit 600 is connected to the current measurement CT unit 520 via the current measurement unit 540, for example, and is configured to acquire current data of the electric wire 100 measured based on the induced voltage output by the current measurement CT unit 520. The wireless unit 600 is also connected to the temperature measurement unit 200, for example, and is configured to acquire temperature data of the connection unit 180 measured by the temperature measurement unit 200. For example, the wireless unit 600 itself may have a measuring instrument with a temperature compensation circuit that measures temperature based on the thermoelectromotive force generated between a pair of thermocouple wires 222, or a measuring instrument with a temperature compensation circuit may be provided as part of the temperature measurement unit 200 separately from the wireless unit 600. The wireless unit 600 is also connected to the power supply CT unit 420 via the power supply unit 440, for example, and is configured to wirelessly transmit various data such as temperature data and current data to the outside using power supplied from the power supply unit 440.

In this embodiment, the wireless unit 600 has, for example, an MCU (Micro Controller Unit) (not shown). The MCU in the wireless unit 600 has, for example, a processor that executes a predetermined program related to the transmission and reception of various data, a memory that stores the program and various data, one or more timers that serve as a reference for the transmission period, and an I/O port that connects to each of the above-mentioned components. All of the components that make up the MCU are incorporated into a single integrated circuit. Note that the wireless unit 600 may have an external memory, such as a FROM (Flash Read-Only Memory), in addition to the memory in the MCU.

As shown in Figures 4 to 11, the wireless unit 600 has, for example, an antenna 620 and is configured to transmit and receive various data via the antenna 620.

In this embodiment, the wireless unit 600 is configured to transmit various data, for example, by so-called multi-hop wireless communication (bucket brigade method). Specifically, for example, in a power transmission equipment monitoring system (power transmission system) having multiple power transmission equipment physical quantity measuring devices 10, the multiple power transmission equipment physical quantity measuring devices 10 are arranged at predetermined intervals along the axial direction of the electric wire 100 (Y direction). Among the multiple power transmission equipment physical quantity measuring devices 10, the wireless unit 600 of a specific power transmission equipment physical quantity measuring device 10, for example, first receives various data from the adjacent power transmission equipment physical quantity measuring device 10 on the upstream side. When the wireless unit 600 of the specific power transmission equipment physical quantity measuring device 10 receives various data from the power transmission equipment physical quantity measuring device 10 on the upstream side, it aggregates various data from the power transmission equipment physical quantity measuring device 10 on the upstream side and its own various data. After the wireless unit 600 of a specific power transmission facility physical quantity measuring device 10 aggregates various data, the wireless unit 600 transmits the aggregated various data to a power transmission facility physical quantity measuring device 10 on the downstream side, which is adjacent to the power transmission facility physical quantity measuring device 10 on the opposite side of the specific power transmission facility physical quantity measuring device 10 on the upstream side. Such aggregation and transmission of various data is repeated in sequence in each of the multiple power transmission facility physical quantity measuring devices 10. When the aggregated various data are transmitted to the last power transmission facility physical quantity measuring device 10, the last power transmission facility physical quantity measuring device 10 transmits the aggregated various data to, for example, a data aggregation transmission device (not shown). The data aggregation transmission device transmits the aggregated various data wirelessly or by wire to, for example, an electric utility as a power supply source that supplies power to the electric wire 100. The electric utility controls the power transmission capacity to the electric wire 100 based on the various data. By transmitting various data in this way using multi-hop wireless communication, it is possible to reduce the power required for the wireless unit 600 of each power transmission equipment physical quantity measuring device 10 while increasing the transmission distance of the multiple power transmission equipment physical quantity measuring devices 10 as a whole.

(Housing and connection modes of each part of this embodiment)
Next, the housing and connection manner of each part of this embodiment will be described with reference to FIGS.

As shown in Figures 4 to 11, in this embodiment, the first housing section 310, for example, houses at least the power supply CT section 420 on the outside of the electric wire 100. On the other hand, the second housing section 320, for example, houses the current measurement CT section 520 on the outside of the electric wire 100. Here, "housing each section on the outside of the electric wire 100" means that each section is housed in an area radially outside the outer periphery of the electric wire 100.

The clamp 700 is connected to at least one of the first accommodating portion 310 and the second accommodating portion 320, for example, and holds the electric wire 100. This allows the first accommodating portion 310 and the second accommodating portion 320 to be fixed to the electric wire 100.

Here, in this embodiment, for example, at least a part of the first housing section 310 and at least a part of the second housing section 320 are separated from each other and configured to be able to be opened and closed individually. This allows the positions of the power supply core 422 of the power supply CT section 420 in the first housing section 310 and the measurement core 522 of the current measurement CT section 520 in the second housing section 320 to be adjusted independently.

The first storage section 310, the second storage section 320, and the clamp 700 are described in detail below.

[First storage section]
As shown in Figures 4 to 11, the first housing section 310 of this embodiment houses not only the power supply CT section 420, but also the power supply section 440, the current measurement section 540 and the wireless section 600 outside the electric wire 100, for example.

The first housing section 310 is made of, for example, a metal that does not contain a magnetic material. Specifically, the first housing section 310 of this embodiment contains, for example, Al or an Al alloy. This makes it possible to prevent the first housing section 310 from blocking the magnetic field around the electric wire 100. In addition, since the first housing section 310 contains Al or an Al alloy, the weight of the first housing section 310 can be reduced.

In addition, the first storage section 310 of this embodiment is, for example, split in half along the axial direction. Of the pair of first half sections obtained by splitting the first storage section 310 in half along the axial direction, the first half section that is positioned vertically lower is referred to as the "first lower half section 316," and the first half section that is positioned vertically upper is referred to as the "first upper half section 318."

9 and 10, the first lower half 316 houses, for example, the lower half core 423d for power supply. Meanwhile, the first upper half 318 houses, for example, the upper half core 423u for power supply. The first upper half 318 is configured, for example, to be openable and closable with respect to the first lower half 316. The first lower half 316 and the first upper half 318 are arranged to face each other with the electric wire 100 in between. Inside the first lower half 316 and the first upper half 318 arranged to face each other, the lower half core 423d for power supply and the upper half core 423u for power supply are joined with their cross-sectional central axes aligned with each other.

As shown in FIG. 4 and FIG. 6 to FIG. 8, in this embodiment, the first lower half 316 and the first upper half 318 are screwed at, for example, at least four points (four locations). Specifically, each of the first lower half 316 and the first upper half 318 has, for example, four flanges 317. Each flange 317 of the first lower half 316 is provided at a circumferential end of the first lower half 316. The four flanges 317 of the first lower half 316 are, for example, arranged symmetrically with respect to the central axis. Each flange 317 of the first lower half 316 is provided with, for example, a hinge bolt (not shown). On the other hand, each flange 317 of the first upper half 318 is provided at a circumferential end of the first upper half 318. The four flanges 317 of the first upper half 318 are, for example, symmetrically arranged with respect to the central axis and are provided at positions corresponding to the four flanges 317 of the first lower half 316. For example, nuts (reference numbers not shown) are provided on each flange 317 of the first upper half 318. The first lower half 316 and the first upper half 318 are connected so as to be able to open and close by fastening the hinge bolt on the first lower half 316 side and the nut on the first upper half 318 side. With this configuration, the first lower half 316 and the first upper half 318 can be stably connected while the power supply lower half core 423d and the power supply upper half core 423u are accurately connected.

9 and 10, the first storage section 310 of this embodiment has, for example, a double-cylinder structure. Specifically, the first storage section 310 has, for example, a first inner tube 312, a first outer tube 314, and a first lid portion 315. The first inner tube 312 has, for example, a first wire insertion hole 311. The electric wires 100 are inserted into the first wire insertion hole 311 at intervals in the radial direction. The first outer tube 314 is provided so as to surround the outer periphery of the first inner tube 312, and forms a first storage space (reference number not shown) between the first inner tube 312 and itself. The first lid portion 315 is provided (welded) to each of both axial ends of the first outer tube 314, and closes the first storage space. In this embodiment, the axial end of the first inner tube 312 on the clamp 700 side is connected to the first lid 315, but as described below, the axial end of the first inner tube 312 on the opposite side to the clamp 700 is not connected to the first lid 315. The above-mentioned first housing space contains, for example, the power supply CT unit 420, the power supply unit 440, the current measurement unit 540, and the wireless unit 600.

In this way, the first housing 310 has a double-cylinder structure, which can prevent rainwater from entering the first housing 310. In addition, by housing the power supply unit 440, the current measurement unit 540, and the wireless unit 600 together with the power supply CT unit 420 in the first housing 310, the wiring connecting them can be shortened. In addition, since the current measurement CT unit 520 in the second housing 320 is relatively heavy, the power supply unit 440, the current measurement unit 540, and the wireless unit 600 are concentrated in the first housing 310, which houses the relatively light power supply CT unit 420, thereby improving the weight balance between the first housing 310 and the second housing 320.

The gaps in the first housing section 310 other than those surrounding the power supply CT section 420, the power supply section 440, the current measurement section 540, and the wireless section 600 are filled with a filler (not shown). The filler is, for example, silicone rubber. This can improve the waterproofing of the first housing section 310.

9 and 10, in this embodiment, for example, the power supply CT unit 420 is arranged closer to the clamp 700 in the first housing 310. Specifically, for example, the power supply CT unit 420 is arranged closer to the clamp 700 than the power supply unit 440, the current measurement unit 540, and the wireless unit 600 in the first housing 310. As described above, the power supply core 422 of the power supply CT unit 420 is made of a magnetic material and is heavier than other members. By bringing the power supply CT unit 420 closer to the clamp 700, the torque applied to the first housing 310 due to the gravity of the power supply core 422 can be reduced.

As shown in Figures 7 and 8, in this embodiment, the first outer cylinder 314 of the first housing 310 has, for example, multiple adjustment screws 314a that adjust the radial position of the power supply CT unit 420. For example, multiple adjustment screws 314a are provided. For example, the multiple adjustment screws 314a are arranged symmetrically around the central axis of the first housing 310. By adjusting such multiple adjustment screws 314a, the radial position of the power supply CT unit 420 can be adjusted with high precision.

As shown in FIG. 9, in this embodiment, the power supply unit 440 is housed in the first upper half 318 of the first housing unit 310. The circuit board constituting the power supply unit 440 is, for example, semicircular in shape following the shape of the first upper half 318.

On the other hand, as shown in Figures 9 and 10, in this embodiment, the circuit boards constituting the current measurement unit 540 and the wireless unit 600 are housed in the first lower half 316 of the first housing unit 310. The circuit boards constituting the current measurement unit 540 and the wireless unit 600 are, for example, arranged in a semicircular arc shape following the shape of the first lower half 316.

In this way, by consolidating the power supply unit 440 in the first upper half 318 and consolidating the current measurement unit 540 and the wireless unit 600 in the first lower half 316, it is possible to reduce the amount of wiring connecting (across) the first upper half 318 and the first lower half 316.

As shown in Figures 4 and 6 to 9, in this embodiment, the antenna 620 of the wireless unit 600 is provided so as to protrude outward from the first lower half 316 of the first housing section 310. By providing the wireless unit 600 and antenna 620 in the first lower half 316 in this way, various data can be stably transmitted to a receiving target on the ground (such as a reader carried by a worker on the ground).

9 and 10, in this embodiment, the diameter of the first wire insertion hole 311 at the end opposite the clamp 700 is, for example, larger than the diameter of the first wire insertion hole 311 at the end on the clamp 700 side. This makes it possible to prevent the end of the first inner tube 312 opposite the clamp 700 (or the first cover portion 315) from coming into contact with the clamp 700 even if the wire 100 is bent.

9 and 10, in this embodiment, the first inner tube 312 has, for example, a first separation portion 312a separated in the axial direction. Specifically, for example, the first separation portion 312a is provided between the axial end of the first inner tube 312 on the opposite side to the clamp 700 and the first lid portion 315. The first separation portion 312a is, for example, provided in a ring shape around the entire circumference of the first inner tube 312 in a part of the axial direction of the first inner tube 312. Note that an insulating member (e.g., insulating resin, not shown) may be fitted into the first separation portion 312a. With this structure, one side and the other side (first lid portion 315) of the first inner tube 312 in the axial direction are separated and insulated from each other. This makes it possible to suppress a decrease in the power generation efficiency by the power supply CT unit 420.

As shown in Figures 4 and 6 to 11, in this embodiment, the first outer cylinder 314 has, for example, a thermocouple insertion tube (lead wire insertion tube) 319. The thermocouple 220 of the temperature measurement unit 200 is inserted into the thermocouple insertion tube 319. The thermocouple insertion tube 319 contains, for example, a metal such as Al. This allows the thermocouple insertion tube 319 to protect the intersection between the thermocouple 220 and the first outer cylinder 314, and suppresses excessive bending of the thermocouple 220.

[Second storage section]
As shown in FIGS. 4 to 11, the second housing section 320 houses the current measuring CT section 520 outside the electric wire 100, for example, as described above.

The second storage section 320 is made of, for example, the same metal as the first storage section 310. This allows the second storage section 320 to achieve the same effect as that achieved by the metal that constitutes the first storage section 310.

In addition, the second storage section 320 of this embodiment is, for example, split in half along the axial direction. Of the pair of second half sections obtained by splitting the second storage section 320 in half along the axial direction, the second half section that is positioned vertically lower is referred to as the "second lower half section 326," and the second half section that is positioned vertically upper is referred to as the "second upper half section 328."

9 and 10, the second lower half 326 houses, for example, the lower half core for measurement 523d. Meanwhile, the second upper half 328 houses, for example, the upper half core for measurement 523u. The second upper half 328 is configured, for example, to be openable and closable with respect to the second lower half 326. The second lower half 326 and the second upper half 328 are arranged to face each other with the electric wire 100 in between. Inside the second lower half 326 and the second upper half 328 arranged to face each other, the lower half core for measurement 523d and the upper half core for measurement 523u are joined with their cross-sectional central axes aligned with each other.

As shown in Figures 4, 6 to 8, in this embodiment, the second lower half 326 and the second upper half 328 are screwed at, for example, at least four points. The manner in which the second housing 320 is screwed is similar to the manner in which the first housing 310 is screwed, except that the position of the flange 327 in the axial direction of the second housing 320 is slightly different from the position of the flange 317. With this configuration, the second lower half 326 and the second upper half 328 can be stably connected while the measurement lower half core 523d and the measurement upper half core 523u are precisely joined.

9 and 10, the second storage section 320 of this embodiment has a double-tube structure, for example, similar to the first storage section 310. Specifically, the second storage section 320 has, for example, a second inner tube 322, a second outer tube 324, and a second lid portion 325. The second inner tube 322 has, for example, a second wire insertion hole 321. The electric wires 100 are inserted into the second wire insertion hole 321 at intervals in the radial direction. The second outer tube 324 is provided to surround the outer periphery of the second inner tube 322, and forms a second storage space (not shown) between the second inner tube 322 and itself. The second lid portion 325 is provided (welded) to each of both axial ends of the second outer tube 324, and closes the second storage space. In this embodiment, the axial end of the second inner tube 322 on the clamp 700 side is connected to the second lid 325, but as described below, the axial end of the second inner tube 322 on the opposite side to the clamp 700 is not connected to the second lid 325. For example, a current measuring CT unit 520 is housed in the second housing space described above.

In this way, the second storage section 320 has a double-cylinder structure, which makes it possible to prevent rainwater from entering the second storage section 320.

In addition, the gaps in the second housing section 320 other than the current measurement CT section 520 are filled with a filler material (not shown) in the same manner as the first housing section 310.

As shown in Figures 4, 6 to 11, in this embodiment, the size of the second housing section 320 is different from the size of the first housing section 310. Specifically, the size of the second housing section 320 in this embodiment is larger than the size of the first housing section 310. That is, the diameter of the second outer cylinder 324 is larger than the diameter of the first outer cylinder 314. The diameter of the second inner cylinder 322 is equal to the diameter of the first inner cylinder 312. As a result, the volume of the second housing space of the second housing section 320 is larger than the volume of the first housing space of the first housing space. As a result, the measurement core 522, which is larger than the power supply core 422, can be stably accommodated in the second housing section 320.

As shown in Figures 9 and 10, in this embodiment, for example, the current measurement CT unit 520 is arranged closer to the clamp 700 within the second housing 320. Specifically, the current measurement CT unit 520 is arranged, for example, closer to the clamp 700 within the second housing 320 than other components such as wiring. By bringing the current measurement CT unit 520 closer to the clamp 700, the torque applied to the second housing 320 due to the gravity of the measurement core 522 can be reduced.

As shown in Figures 7 and 8, in this embodiment, the second outer tube 324 of the second housing portion 320 has, for example, a plurality of adjustment screws 324a that adjust the radial position of the current measurement CT portion 520. The arrangement of the adjustment screws 324a on the second outer tube 324 is similar to the arrangement of the adjustment screws 314a on the first outer tube 314, except that the axial position of the second outer tube 324 is different. By adjusting such a plurality of adjustment screws 324a, the radial position of the current measurement CT portion 520 can be adjusted with high precision.

9 and 10, in this embodiment, the diameter of the second wire insertion hole 321 at the end opposite the clamp 700 is, for example, larger than the diameter of the second wire insertion hole 321 at the end on the clamp 700 side. This makes it possible to prevent the end of the second inner tube 322 opposite the clamp 700 (or the second cover portion 325) from coming into contact with the clamp 700 even if the wire 100 is bent.

9 and 10, in this embodiment, the second inner tube 322 has, for example, a second separation portion 322a separated in the axial direction. Specifically, for example, the second separation portion 322a is provided between the axial end of the second inner tube 322 on the opposite side to the clamp 700 and the second lid portion 325. The second separation portion 322a is, for example, provided in a ring shape around the entire circumference of the second inner tube 322 in a part of the axial direction of the second inner tube 322. Note that an insulating member (e.g., insulating resin, not shown) may be fitted into the second separation portion 322a. With this structure, one side and the other side (second lid portion 325) of the second inner tube 322 in the axial direction are separated and insulated from each other. This makes it possible to suppress a decrease in the accuracy of current measurement by the current measurement CT unit 520.

(Clamp)
4 and 6 to 11, the clamp 700 of the present embodiment is provided, for example, between the first accommodating portion 310 and the second accommodating portion 320, and is connected to each of the first accommodating portion 310 and the second accommodating portion 320. The clamp 700 grips the electric wire 100 between the first accommodating portion 310 and the second accommodating portion 320, and fixes the first accommodating portion 310 and the second accommodating portion 320 to the electric wire 100.

The clamp 700 is made of, for example, the same metal as the metal that constitutes the twisted wire layer of the electric wire 100. Specifically, the clamp 700 contains, for example, Al or an Al alloy. This makes it possible to suppress electrolytic corrosion caused by contact between the clamp 700 and the electric wire 100.

The clamp 700 has, for example, a clamp lower part 720 and a clamp upper part 740. The clamp lower part 720 is arranged, for example, on the vertical lower side of the electric wire 100. The clamp lower part 720 has, for example, a recess (not shown) in which the electric wire 100 fits, at the center of the vertical upper side. On the other hand, the clamp upper part 740 is arranged, for example, on the vertical upper side of the electric wire 100. The clamp upper part 740 has, for example, a recess (not shown) in which the electric wire 100 fits, at the center of the vertical lower side. The clamp lower part 720 and the clamp upper part 740 are arranged, for example, opposite each other with the electric wire 100 in between. The recess of the clamp lower part 720 and the recess of the clamp upper part 740 form an electric wire insertion hole 710. The clamp lower part 720 and the clamp upper part 740 are screwed together, for example, with the electric wire 100 inserted into the electric wire insertion hole 710. In this way, the clamp 700 can hold the electric wire 100.

In this embodiment, the first lower half 316 of the first accommodating section 310 and the second lower half 326 of the second accommodating section 320 are connected to the clamp lower section 720 (e.g., by screw fastening). This allows the clamp 700 to fix the first lower half 316 of the first accommodating section 310 and the second lower half 326 of the second accommodating section 320 to the electric wire 100.

On the other hand, in this embodiment, the clamp upper portion 740, the first upper half portion 318 of the first storage portion 310, and the second upper half portion 328 of the second storage portion 320 are not connected and are separated from each other. This allows the first upper half portion 318 of the first storage portion 310 and the second upper half portion 328 of the second storage portion 320 to be opened and closed individually.

In this embodiment, the clamp 700 connects the first accommodating portion 310 and the second accommodating portion 320 so that, for example, when the electric wire 100 is gripped, a predetermined gap is provided between the first inner tube 312 and the second inner tube 322 and the electric wire 100. Specifically, the diameter of the electric wire insertion hole 710 of the clamp 700 is smaller than the diameter of the first electric wire insertion hole 311 and the diameter of the second electric wire insertion hole 321, for example, and is close to the outer diameter of the electric wire 100. In addition, the clamp lower portion 720, the first lower half portion 316, and the second lower half portion 326 are connected in a state in which the electric wire insertion hole 710, the first electric wire insertion hole 311, and the second electric wire insertion hole 321 are aligned with each other. With this configuration, when the clamp 700 grips the electric wire 100, a predetermined distance can be ensured between the electric wire 100 and the inside of each of the first electric wire insertion hole 311 and the second electric wire insertion hole 321.

Here, when the clamp 700 grips the electric wire 100, one axial end of the first inner tube 312 and one axial end of the second inner tube 322 on the clamp 700 side contact the electric wire 100 via the clamp 700. As a result, the first accommodating section 310 and the second accommodating section 320 are electrically connected to the electric wire 100 via the clamp 700. As a result, the clamp 700, the first accommodating section 310, and the second accommodating section 320 are at the same potential as the electric wire 100.

On the other hand, the other axial end of the first inner tube 312 and the other axial end of the second inner tube 322 on the opposite side to the clamp 700 are radially separated from the electric wire 100, i.e., insulated, due to the above-mentioned configuration. This makes it possible to prevent both axial ends of the first inner tube 312 and both axial ends of the second inner tube 322 from being electrically connected to the electric wire 100. As a result, it is possible to prevent the formation of a detour (closed circuit) for the current flowing through the electric wire 100.

9 and 11, in this embodiment, the clamp lower part 720 has a wiring insertion hole 721 through which a predetermined wiring (not shown) is inserted. The wiring insertion hole 721 penetrates the clamp lower part 720 along the axial direction of the electric wire insertion hole 710 of the clamp 700, for example. By inserting a predetermined wiring into the wiring insertion hole 721 of the clamp 700 between the first housing part 310 and the second housing part 320, the current measurement CT part 520 in the second housing part 320 and the current measurement part 540 and the wireless part 600 in the first housing part 310 can be stably connected via wiring.

The clamp lower portion 720 connected to the first lower half portion 316 of the first storage portion 310 and the second lower half portion 326 of the second storage portion 320 has the above-mentioned wiring insertion hole 721, which can prevent the wiring from interfering with the first upper half portion 318 or the second upper half portion 328 when either the first upper half portion 318 or the second upper half portion 328 is opened or closed.

(2) Effects of the Present Embodiment According to the present embodiment, one or more of the following effects can be obtained.

(a) At least a portion of the first storage section 310 and at least a portion of the second storage section 320 are separated from each other and configured to be able to be opened and closed individually.

Here, consider the case where, in the power transmission equipment physical quantity measuring device, the pair of half cores of the power supply CT section and the pair of half cores of the current measurement CT section are housed, for example, in a single common housing. In this case, when the power transmission equipment physical quantity measuring device is attached to the electric wire and the housing section is closed, the pair of half cores of the power supply CT section are joined together, and the pair of half cores of the current measurement CT section are joined together.

However, if the power supply CT section and the current measurement CT section are housed in a common housing section, the pair of half cores of the power supply CT section and the pair of half cores of the current measurement CT section cannot be adjusted in position independently. For example, if the pair of half cores in one of the power supply CT section and the current measurement CT section are joined based on the reference, the pair of half cores in the other may not be joined with high precision. Specifically, the cross-sectional central axes of the pair of half cores in the other may be misaligned, or a gap may be created between the pair of half cores in the other. If there is poor joining of the pair of half cores in the other of the power supply CT section and the current measurement CT section, the power generation efficiency of the power supply CT section may decrease, or the current measurement accuracy of the current measurement CT section may decrease.

In contrast, in this embodiment, at least a part of the first housing section 310 and at least a part of the second housing section 320 can be opened and closed individually, so that the power supply core 422 of the power supply CT section 420 in the first housing section 310 and the measurement core 522 of the current measurement CT section 520 in the second housing section 320 can be independently adjusted in position. Specifically, the cross-sectional central axes of the pair of half-split cores of the power supply CT section 420 can be precisely aligned with each other, and the cross-sectional central axes of the pair of half-split cores of the current measurement CT section 520 can be precisely aligned with each other. In addition, the occurrence of a gap between the pair of half-split cores of the power supply CT section 420 can be suppressed, and the occurrence of a gap between the pair of half-split cores of the current measurement CT section 520 can be suppressed. In this way, the pair of half-split cores of the power supply CT section 420 can be precisely coupled, and the pair of half-split cores of the current measurement CT section 520 can be precisely coupled. As a result, it is possible to improve the power generation efficiency of the power supply CT unit 420 and improve the current measurement accuracy of the current measurement CT unit 520.

(b) The clamp 700 is provided between the first storage section 310 and the second storage section 320, and holds the electric wire 100 between the first storage section 310 and the second storage section 320. That is, the holding point (support point) of the clamp 700 can be positioned between the center of gravity of the first storage section 310 and the center of gravity of the second storage section 320. This allows the first storage section 310 and the second storage section 320 to be fixed to the electric wire 100 in a well-balanced manner via the clamp 700. That is, the structure of the power transmission facility physical quantity measuring device 10 can be made weight-balanced and mechanically stabilized. Specifically, for example, even if the electric wire 100 vibrates, the posture of the power transmission facility physical quantity measuring device 10 can be stably maintained without excessive tilting.

(c) The power supply CT section 420 is disposed closer to the clamp 700 within the first housing section 310. The power supply core 422 of the power supply CT section 420 is heavier than the other components. By bringing the power supply CT section 420 closer to the clamp 700, the torque applied to the first housing section 310 due to the gravity of the power supply core 422 can be reduced. This allows the first housing section 310 to stably hold the power supply CT section 420 and other components.

The current measurement CT unit 520 is disposed closer to the clamp 700 within the second housing 320. By bringing the current measurement CT unit 520 closer to the clamp 700, the torque applied to the second housing 320 due to the gravity of the measurement core 522 can be reduced. This allows the current measurement CT unit 520 and other components to be stably held by the second housing 320.

(d) The first outer cylinder 314 of the first housing 310 has a number of adjustment screws 314a for adjusting the radial position of the power supply CT section 420. By adjusting the number of adjustment screws 314a, the radial position of the power supply CT section 420 can be adjusted with precision. This allows the pair of half cores of the power supply CT section 420 to be easily and precisely joined. In addition, by adjusting the number of adjustment screws 314a, the central axis of the arc of the power supply core 422 of the power supply CT section 420 can be easily aligned with the axis of the electric wire 100. As a result, the power generation efficiency of the power supply CT section 420 can be improved.

The second outer cylinder 324 of the second housing 320 has a plurality of adjustment screws 324a for adjusting the radial position of the current measurement CT section 520. By adjusting the plurality of adjustment screws 324a, the radial position of the current measurement CT section 520 can be adjusted with precision. This allows the pair of half cores of the current measurement CT section 520 to be easily and precisely joined. Furthermore, by adjusting the plurality of adjustment screws 324a, the central axis of the arc of the measurement core 522 of the current measurement CT section 520 can be easily aligned with the axis of the electric wire 100. As a result, the accuracy of current measurement by the current measurement CT section 520 can be improved.

(e) By separating at least a portion of the first storage section 310 from at least a portion of the second storage section 320, the size of the first storage section 310 and the size of the second storage section 320 can be made different from each other. This allows the size of the first storage section 310 and the size of the second storage section 320 to be set arbitrarily according to the size of the power supply CT section 420 and the size of the current measurement CT section 520.

In this embodiment, for example, the measurement core 522 is larger than the power supply core 422 so that a large current can be measured, and therefore the size of the second housing section 320 is larger than the size of the first housing section 310. This allows the measurement core 522, which is larger than the power supply core 422, to be stably housed within the second housing section 320.

(f) The clamp 700 has a wiring insertion hole 721. By inserting a specific wiring through the wiring insertion hole 721 of the clamp 700 between the first housing portion 310 and the second housing portion 320, the current measurement CT unit 520 in the second housing portion 320 and the current measurement unit 540 and the wireless unit 600 in the first housing portion 310 can be stably connected via wiring.

The clamp 700, which is made of a metal that does not contain a magnetic material, can shield the wiring inserted into the wiring insertion hole 721. This makes it possible to suppress the effect of the electromagnetic field from the electric wire 100 on the wiring inserted into the wiring insertion hole 721.

As a result, the signal based on the induced voltage output by the current measurement CT unit 520 in the second housing unit 320 can be stably transmitted to the current measurement unit 540 and the wireless unit 600 in the first housing unit 310.

(g) The diameter of the first wire insertion hole 311 at the end opposite the clamp 700 is larger than the diameter of the first wire insertion hole 311 at the end on the clamp 700 side. This makes it possible to prevent the end of the first inner tube 312 opposite the clamp 700 (or the first cover portion 315) from coming into contact with the clamp 700 even if the wire 100 is bent. In other words, it is possible to prevent both axial ends of the first inner tube 312 from being electrically connected to the wire 100. As a result, it is possible to prevent the formation of a detour for the current flowing through the wire 100 in the first accommodating portion 310.

The diameter of the second wire insertion hole 321 at the end opposite the clamp 700 is larger than the diameter of the second wire insertion hole 321 at the end on the clamp 700 side. This makes it possible to prevent the formation of a detour for the current flowing through the wire 100 in the second accommodating section 320, as in the first accommodating section 310.

(3) Modifications of the Second Embodiment of the Present Disclosure The above-described embodiment can be modified as necessary as in the following modifications. Hereinafter, only elements different from the above-described embodiment will be described, and elements substantially the same as those described in the above-described embodiment will be denoted by the same reference numerals and their description will be omitted.

The power transmission facility physical quantity measuring device 12 according to the modified example will be described with reference to Figures 13 and 14. Figures 13 and 14 are a front view and a left side view, respectively, showing a power transmission facility physical quantity measuring device according to the modified example of this embodiment.

In the modified power transmission equipment physical quantity measuring device 12, the connection manner of the second housing 320 differs from that of the above-described embodiment.

As shown in Figs. 13 and 14, in the modified power transmission equipment physical quantity measuring device 12, the clamp 700 in normal operation is not connected to, for example, the second housing 320 that houses the current measuring CT unit 520 on the outside of the electric wire 100. On the other hand, the clamp 700 is configured such that, for example, the second housing 320 can be connected independently of the first housing 310.

In other words, the clamp 700 in the above embodiment may be considered to removably connect the second storage section 320.

Specifically, the clamp lower portion 720 of the clamp 700 can be connected to the second lower half portion 326 of the second housing portion 320 by, for example, screw fastening (not shown). On the other hand, the first housing portion 310 does not have a screw fastening portion for the second housing portion 320, and the second housing portion 320 is not connected to it. This allows the second housing portion 320 to be connected to the clamp 700 independently of the first housing portion 310.

The clamp lower part 720 also has, for example, a wiring insertion hole 721. This allows a predetermined wiring to be inserted through the wiring insertion hole 721 of the clamp 700 between the first housing part 310 and the second housing part 320 when the second housing part 320 is connected to the clamp 700, and the current measurement CT part 520 in the second housing part 320 and the current measurement part 540 and the wireless part 600 in the first housing part 310 can be stably connected via the wiring.

(effect)
(a) According to this modification, the clamp 700 is configured so that the second housing portion 320 can be connected independently of the first housing portion 310. This allows at least a part of the first housing portion 310 and at least a part of the second housing portion 320 to be opened and closed individually while separated from each other. As a result, it is possible to improve the power generation efficiency of the power supply CT unit 420, and when the second housing portion 320 is connected to the clamp 700, it is possible to improve the current measurement accuracy of the current measurement CT unit 520.

(b) The second housing 320 housing the current measuring CT unit 520 is not connected to the clamp 700 under normal conditions. This allows the power transmission equipment physical quantity measuring device 12 to be conveniently installed in a location where it is not necessary to measure the current of the electric wire 100. As a result, the power transmission equipment physical quantity measuring device 12 can be configured with a minimum number of parts, reducing the cost of the power transmission equipment physical quantity measuring device 12.

On the other hand, after the power transmission equipment physical quantity measuring device 12 is installed, when it becomes necessary to measure the current of the electric wire 100, the second housing section 320 housing the current measuring CT section 520 can be connected to the clamp 700. In other words, in this modified example, it is possible to appropriately select the connection mode according to the need for measuring the electric wire physical quantity.

(c) The power transmission equipment physical quantity measuring device 12 of this modified example has parts in common with the power transmission equipment physical quantity measuring device 10 of the above-described embodiment capable of measuring current. This makes it possible to reduce the manufacturing cost of the entire system including the power transmission equipment physical quantity measuring device 10 and the power transmission equipment physical quantity measuring device 12.

<Other embodiments of the present disclosure>
Although the embodiments of the present disclosure have been specifically described above, the present disclosure is not limited to the above-described embodiments and can be modified in various ways without departing from the spirit and scope of the present disclosure.

In the above embodiment, the resin layer 230 covers the exposed portions EP of the pair of thermocouple wires 222, but the resin layer 230 may also cover at least a portion of the insulating layer 224 of the thermocouple 220.

In the above embodiment, the case where the corrosion potential of the plate portion 240 is closer to the connection portion 180 than the corrosion potentials of each of the pair of thermocouple wires 222 has been described, but as long as at least the first arm 242 of the plate portion 240 satisfies the above-mentioned corrosion potential relationship, the first arm 242 may contain a metal different from the second arm 244 and the block portion 260. However, it is preferable that the first arm 242, the second arm 244, and the block portion 260 contain the same metal from the viewpoints of suppressing electrolytic corrosion between them and suppressing misalignment due to differences in their thermal expansion coefficients.

In the above embodiment, the side where the first piece 242 and the second piece 244 are connected is opposite the side of the second piece 244 where the exposed portions EP of the pair of thermocouple wires 222 are inserted. However, the connection between the first piece 242 and the second piece 244 may be located in any position as long as it does not interfere with the insertion of the exposed portions EP of the pair of thermocouple wires 222.

In the above-mentioned second embodiment, the first lower half 316 and the second lower half 326 are connected via the clamp 700, and the first upper half 318 and the second upper half 328 are separated from each other. However, this is not limited to this case. At least one of the first lower half 316 and the first upper half 318 and at least one of the second lower half 326 and the second upper half 328 may be separated from each other and configured to be individually openable and closable. Specifically, for example, the first upper half 318 and the second upper half 328 may be connected via the clamp 700, and the first lower half 316 and the second lower half 326 may be separated from each other. However, as in the above embodiment, if the first lower half 316 and the second lower half 326 are connected via a clamp 700, the work of attaching the power transmission equipment physical quantity measuring device 10 to the electric wire 100 can be performed more easily.

In the second embodiment described above, the power supply core 422, the measurement core 522, the first housing section 310, and the second housing section 320 are each split in half (split into two) along the axial direction, but this is not limited to the above case. The power supply core 422, the measurement core 522, the first housing section 310, and the second housing section 320 may each be split into three or more parts along the axial direction. However, if each of these is split in half as in the above embodiment, the work of attaching the power transmission equipment physical quantity measuring device 10 to the electric wire 100 can be performed more easily.

In the above-mentioned second embodiment, the clamp 700 is provided between the first storage section 310 and the second storage section 320, but this is not limited to the above. As long as the clamp 700 is connected to at least one of the first storage section 310 and the second storage section 320, the clamp 700 does not have to be provided between the first storage section 310 and the second storage section 320. Specifically, the clamp 700, a part of the first storage section 310, and a part of the second storage section 320 may be connected in this order, or the clamp 700, a part of the second storage section 320, and a part of the first storage section 310 may be connected in this order. Note that even in these cases, at least a part of the first storage section 310 and at least a part of the second storage section 320 must be separated from each other.

In the second embodiment described above, the clamp 700 has a wiring insertion hole 721, but this is not limited to this case. If the current measurement CT unit 520, the current measurement unit 540, and the wireless unit 600 can be connected between the first storage unit 310 and the second storage unit 320 on the outside of the clamp 700, the clamp 700 does not necessarily have to have a wiring insertion hole 721. However, in order to obtain shielding of the wiring from the electromagnetic field, the above-mentioned embodiment is preferable.

In the second embodiment described above, the first storage section 310 and the second storage section 320 are different in size, but this is not limited to the above case. The first storage section 310 and the second storage section 320 may be the same in size. This can improve the weight balance between the first storage section 310 and the second storage section 320. In addition, the first storage section 310 and the second storage section 320 can be constructed using common parts, which can reduce the manufacturing costs.

In the second embodiment described above, the case where the size of the second housing section 320 is larger than the size of the first housing section 310 has been described, but this is not limited to this case. For example, if the power supply core 422 is larger than the measurement core 522, the size of the first housing section 310 may be larger than the size of the second housing section 320.

In the second embodiment described above, the clamp 700 is divided into two parts, an upper part and a lower part, but this is not limited to this case. For example, the clamp 700 may be configured with a C-shaped cross section.

In the second embodiment described above, the clamp lower portion 720 of the clamp 700 is connected to the first lower half portion 316 and the second lower half portion 326 by screw fastening, but this is not limited to this case. The clamp lower portion 720 of the clamp 700 may be connected to the first lower half portion 316 and the second lower half portion 326 by welding (excluding modified examples).

In the above-described second embodiment, the case where the power transmission equipment physical quantity measuring device 10 is configured to measure the current flowing through the electric wire 100 and the temperature of the connection part 180 as physical quantities of the power transmission equipment has been described, but this is not limited to this case. The power transmission equipment physical quantity measuring device 10 may also be configured to measure other physical quantities in addition to the current flowing through the electric wire 100 and the temperature of the connection part 180. Examples of other physical quantities include the vibration of the electric wire 100 and the slackness of the electric wire 100.

In the above-mentioned second embodiment, the case where the wireless unit 600 is configured to transmit various data by a bucket brigade method has been described, but this is not limited to this case. For example, if the wireless unit 600 is configured to be capable of long-distance transmission, the wireless unit 600 may be configured to transmit various data directly to a data aggregation transmission device or an electric utility company.

Next, examples of the present disclosure will be described. These examples are merely examples of the present disclosure, and the present disclosure is not limited to these examples.

(1) Temperature Measuring Device An example of a temperature measuring device having the same configuration as that of the above-described first embodiment and made of the following materials and dimensions was prepared.

Thermocouple: K thermocouple Plate material: Al
The thickness of each of the first and second pieces of the plate part: 0.4 mm
Longitudinal length of the first piece: 57 mm
Longitudinal length of the second piece: 27 mm

Block material: Aluminum
Block thickness: 5mm
Length of block in longitudinal direction: 57 mm
Short side length of block part: 10 mm
Engagement groove width: 7 mm
Position of the first engagement groove and the second engagement groove: 5 mm from both ends of the block part in the longitudinal direction
Position of the second engagement groove: Center of the block in the longitudinal direction Width of the insertion groove: 3 mm
Position of the end of the insertion groove: Position overlapping with the second engagement groove

Resin layer: Silicone rubber Binding part: Insulock (registered trademark) manufactured by HellermannTyton

(2) Evaluation First, as the connection to be measured, a compression connection pipe to which the following electric wires were compression-connected was prepared.

Wire: Steel core aluminum stranded wire ACSR ^410mm2
Compression connection pipe: Compression type clamp for ACSR 410 ^mm2

A thermocouple was attached directly to one outer surface of the compression connection tube as a reference. Meanwhile, a temperature measuring device according to the embodiment was attached to the other outer surface of the same compression connection tube via a bundling part.

After installation, a current was passed through the wire to gradually increase the temperature of the wire and the compression connection tube. At this time, the temperature was measured simultaneously at approximately the same position on the compression connection tube using both the reference thermocouple and the temperature measuring device of the embodiment.

(3) Results The temperature measurement results of the example will be described with reference to Fig. 15. Fig. 15 is a diagram showing the temperature measurement results of the example.

As shown in FIG. 15, the temperature measurement value measured by the temperature measurement device of the embodiment was almost equal to the reference temperature measurement value measured by the reference thermocouple. In addition, the temperature measurement value measured by the temperature measurement device of the embodiment had good tracking ability with respect to the temperature rise of the connection part.

As a result, it was confirmed that the temperature measuring device of the embodiment can measure the temperature of the connection part stably and accurately.

In addition, with the temperature measuring device of the embodiment, it was considered that the thermal capacity of the block part would affect the accuracy of the temperature measurement. However, since the thermal capacity of the compression connection tube as the measurement object is relatively large, the effect of the thermal capacity of the block part on the accuracy of the temperature measurement was small. As a result, it was confirmed that the temperature measuring device of the embodiment can obtain sufficient accuracy in the temperature measurement.

<Preferred embodiment of the present disclosure>
Preferred aspects of the present disclosure are described below.

(Appendix 1)
A temperature measuring device for measuring a temperature at a connection part having a polygonal cross section where an electric wire is compressed and connected,
a thermocouple including an exposed portion at which a pair of thermocouple wires are exposed;
a metal plate portion interposed between the thermocouple and the connection portion and arranged so as to be in direct contact with the connection portion;
Equipped with
the plate portion has a corrosion potential closer to a corrosion potential of the connection portion than a corrosion potential of each of the pair of thermocouple wires,
The plate portion is a temperature measuring device configured in a flat plate shape so as to be in surface contact with the outer peripheral surface of the connection portion.

(Appendix 2)
a block portion that holds the thermocouple together with the plate portion;
a bundling portion bundling the connection portion, the plate portion, the thermocouple, and the block portion together;
Equipped with
2. The temperature measuring device according to claim 1, wherein the block portion has an engagement groove into which the binding portion engages.

(Appendix 3)
3. The temperature measuring device according to claim 2, wherein the block portion has an insertion groove into which the thermocouple is inserted on a side facing the plate portion.

(Appendix 4)
The bundling portion is provided in plurality,
The engagement groove is provided in a plurality of grooves so that the binding portions can be engaged with each other,
4. The temperature measuring device according to claim 2, wherein one of the plurality of engagement grooves is provided at a position overlapping with the exposed portions of the pair of thermocouple wires.

(Appendix 5)
5. The temperature measuring device according to claim 1, further comprising a resin layer covering the exposed portions of the pair of thermocouple wires in a state in which the exposed portions are in contact with the plate portion.

(Appendix 6)
The plate portion is
A first piece portion is arranged to directly contact the connection portion;
a second piece portion that, together with the first piece portion, sandwiches the exposed portions of the pair of thermocouple wires;
6. The temperature measuring device according to claim 1, further comprising:

(Appendix 7)
The temperature measuring device according to claim 6, wherein the second piece is connected to one end of the first piece in a surface direction.

(Appendix 8)
The first piece and the second piece are configured in a flat plate shape,
8. The temperature measuring device according to claim 6, wherein the exposed portions of the pair of thermocouple wires are inserted between the first piece and the second piece along a surface direction defined by the first piece and the second piece.

(Appendix 9)
The thermocouple is
an insulating layer covering an outer periphery of the pair of thermocouple wires;
a shield portion including a braided wire covering an outer periphery of the insulating layer;
having
9. The temperature measuring device according to claim 1, wherein the shield portion covers a portion of the insulating layer that extends outward beyond the plate portion.

(Appendix 10)
10. The temperature measuring device according to claim 1, wherein the temperature measuring device is disposed vertically below the connection portion.

(Appendix 11)
a temperature measuring unit for measuring a temperature of a connection portion having a polygonal cross section at which the electric wires are compressed and connected;
a power supply current transformer unit that is disposed so as to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field generated based on a current flowing through the electric wire;
a wireless unit connected to the temperature measurement unit and the power supply current transformer unit, and configured to wirelessly transmit temperature data of the connection unit measured by the temperature measurement unit to an external device using electric power from the power supply current transformer unit;
Equipped with
The temperature measuring unit is
a thermocouple including an exposed portion at which a pair of thermocouple wires are exposed;
a metal plate portion interposed between the thermocouple and the connection portion and arranged so as to be in direct contact with the connection portion;
Equipped with
the plate portion has a corrosion potential closer to a corrosion potential of the connection portion than a corrosion potential of each of the pair of thermocouple wires,
The plate portion is a power transmission equipment physical quantity measuring device configured in a flat plate shape so as to make surface contact with the outer peripheral surface of the connection portion.

(Appendix 12)
An electric wire having a plurality of metal wires at its outermost periphery and transmitting electric power;
a power supply source for supplying power to the electric wire;
a plurality of power transmission facility physical quantity measuring devices arranged at predetermined intervals along the axial direction of the electric wire, each measuring a physical quantity related to the power transmission facility and transmitting the measured physical quantity data in a bucket brigade manner;
a data aggregation and transmission device that aggregates the physical quantity data transmitted from the plurality of power transmission facility physical quantity measurement devices and transmits the aggregated physical quantity data to the power supply source;
having
The power supply source controls a transmission capacity to the power line based on the physical quantity data;
Each of the plurality of power transmission facility physical quantity measuring devices is
a temperature measuring unit for measuring a temperature of a connection portion having a polygonal cross section at which the electric wires are compressed and connected;
a power supply current transformer unit that is disposed so as to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field generated based on a current flowing through the electric wire;
a wireless unit connected to the temperature measurement unit and the power supply current transformer unit, and configured to wirelessly transmit temperature data of the connection unit measured by the temperature measurement unit to an external device using electric power from the power supply current transformer unit;
Equipped with
The temperature measuring unit is
a thermocouple including an exposed portion at which a pair of thermocouple wires are exposed;
a metal plate portion interposed between the thermocouple and the connection portion and arranged so as to be in direct contact with the connection portion;
Equipped with
the plate portion has a corrosion potential closer to a corrosion potential of the connection portion than a corrosion potential of each of the pair of thermocouple wires,
The plate portion is configured in a flat plate shape so as to be in surface contact with an outer peripheral surface of the connection portion.

10, 12 Power transmission facility physical quantity measuring device 100 Electric wire 180 Connection part 200 Temperature measuring device (temperature measuring part)
220 Thermocouple 222 Thermocouple wire 224 Insulating layer 224a Inner insulating layer 224b Outer insulating layer 226 Shield portion 228 Aluminum tape 230, 234 Resin layer 240 Plate portion 242 First piece portion 244 Second piece portion 260 Block portion 262 Engagement groove 262a First engagement groove 262b Second engagement groove 262c Third engagement groove 280 Binding portion 280a First binding portion 280b Second binding portion 280c Third binding portion 310 First storage portion 311 First electric wire insertion hole 312 First inner tube 312a First separation portion 314 First outer tube 314a Adjustment screw 315 First lid portion 316 First lower half portion 317 Flange portion 318 First upper half portion 319 Thermocouple insertion tube 320 Second accommodating portion 321 Second wire insertion hole 322 Second inner cylinder 322a Second separation portion 324 Second outer cylinder 324a Adjustment screw 325 Second lid portion 326 Second lower half portion 327 Flange portion 328 Second upper half portion 420 Power supply CT portion 422 Power supply core 423d Power supply lower half core 423u Power supply upper half core 424 Power supply coil 440 Power supply portion 520 Current measurement CT portion 522 Measurement core 523d Measurement lower half core 523u Measurement upper half core 524 Measurement coil 540 Current measurement portion 600 Wireless portion 620 Antenna 700 Clamp 710 Wire insertion hole 720 Clamp lower portion 721 Wiring insertion hole 740 Clamp upper portion EP Exposed portion

Claims (8)

A temperature measuring device for measuring a temperature at a connection part that is polygonal in cross section and contains aluminum or an aluminum alloy and that compresses and connects electric wires,
a thermocouple including an exposed portion at which a pair of thermocouple wires are exposed;
a metal plate portion interposed between the thermocouple and the connection portion and arranged so as to be in direct contact with the connection portion;
Equipped with
the plate portion has a corrosion potential closer to a corrosion potential of aluminum or an aluminum alloy than a corrosion potential of each of the pair of thermocouple wires;
The plate portion is a temperature measuring device configured in a flat plate shape so as to be in surface contact with the outer peripheral surface of the connection portion. a block portion that holds the thermocouple together with the plate portion;
a bundling portion bundling the connection portion, the plate portion, the thermocouple, and the block portion together;
Equipped with
The temperature measuring device according to claim 1 , wherein the block portion has an engagement groove into which the binding portion is engaged. 3. The temperature measuring device according to claim 2, wherein the block portion has an insertion groove, into which the thermocouple is inserted, on a side facing the plate portion. The bundling portion is provided in plurality,
The engagement groove is provided in a plurality of grooves so that the binding portions can be engaged with each other,
4. The temperature measuring device according to claim 2, wherein one of the plurality of engagement grooves is provided at a position overlapping the exposed portions of the pair of thermocouple wires. 5 . The temperature measuring device according to claim 1 , further comprising a resin layer that covers the exposed portions of the pair of thermocouple wires in a state where the exposed portions are in contact with the plate portion. The plate portion is
A first piece portion is arranged to directly contact the connection portion;
a second piece portion that, together with the first piece portion, sandwiches the exposed portions of the pair of thermocouple wires;
The temperature measuring device according to any one of claims 1 to 5, further comprising: The temperature measuring device according to claim 6 , wherein the second piece is connected to one end of the first piece in a surface direction. a temperature measuring unit for measuring a temperature of a connection part that has a polygonal cross section and contains aluminum or an aluminum alloy and that compressively connects the electric wires;
a power supply current transformer unit that is disposed so as to surround the electric wire and generates electric power by electromagnetic induction from a magnetic field generated based on a current flowing through the electric wire;
a wireless unit connected to the temperature measurement unit and the power supply current transformer unit, and configured to wirelessly transmit temperature data of the connection unit measured by the temperature measurement unit to an external device using electric power from the power supply current transformer unit;
Equipped with
The temperature measuring unit is
a thermocouple including an exposed portion at which a pair of thermocouple wires are exposed;
a metal plate portion interposed between the thermocouple and the connection portion and arranged so as to be in direct contact with the connection portion;
Equipped with
the plate portion has a corrosion potential closer to a corrosion potential of aluminum or an aluminum alloy than a corrosion potential of each of the pair of thermocouple wires;
The plate portion is a power transmission equipment physical quantity measuring device configured in a flat plate shape so as to make surface contact with the outer peripheral surface of the connection portion.

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