JPH04106477A - Electroscope - Google Patents

Abstract

PURPOSE:To enable the improving of detection accuracy and the miniaturizing of the apparatus as a whole by interposing a magnetic field sensor head between cores divided. CONSTITUTION:A core 6 is divided into an upper core 6A and a pair of lower cores 6B and 6C and a magnetic field sensor head 21 is interposed between divided parts of the lower cores 6B and 6C. Therefore, as there is no effect of other phases in three phase-electric lines appearing on the magnetic field sensor head 21, the detection of line currents or the like is accomplished for each phase accurately. In addition, it is not necessary to secure a large housing space for the magnetic field sensor head 21 in an insulated container 3, allowing the miniaturization of the apparatus as a whole. This eliminates the need for connecting the core 6 and the magnetic field sensor head 21 with a lead thereby simplifying connecting work. Furthermore, the connection of upper and lower holders 7A and 7B enables the arranging of the cores 6A, 6B and 6C simply on an electric wire 2 coaxially.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a voltage detection device disposed on a three-phase electric line and used for detecting line current, line voltage, etc.

[Prior Art] As a conventional voltage detection device of this type, for example, Japanese Patent Application Laid-open No. 1983-
A structure as shown in Japanese Patent No. 96568 is known.

In this conventional device, a core made of a magnetic material is arranged so as to surround an electric wire, a secondary winding is provided on the core, and a secondary load resistance for voltage detection and a voltage sensor head are installed in a container connected to the core. The secondary winding provided on the core, the secondary burden resistor, and the sensor head were connected by lead wires.

[Problems to be Solved by the Invention] However, in this conventional voltage detection device, since the voltage sensor head is arranged apart from the core, a large accommodation space for the sensor head is required in the container. There are problems in that the entire device becomes large-sized, and it is necessary to connect the core and the sensor head with lead wires, making the connection work very troublesome.

This invention was made by focusing on the problems that exist in the conventional technology, and its purpose is to secure a large housing space for the sensor head within the insulating container. To provide a voltage detection device that does not require a lead wire to connect a core and a sensor head, thereby making the entire device smaller and simplifying the connection work. be.

[Means for Solving the Problems] In order to achieve the above object, in the invention according to claim 1, a core made of a magnetic material is attached to a holder and arranged so as to surround the electric wire. , this holder is connected to an insulating container, the core is divided, a current sensor head is interposed between the divided parts, and a signal line of this sensor head is drawn out from one end of the insulating container.

Further, in the invention according to claim 2, the holder is divided into parts, and the electric wire is held between the divided parts.

[Function] In the voltage detection device configured as described above, the core is divided and a magnetic field sensor head is interposed between the divided parts, so a large storage space for the sensor head is provided in the insulating container. Since there is no need to secure the core and the sensor head, the entire device can be made smaller, and since there is no need to connect the core and the sensor head with a Leet wire, the connection work can be easily performed.

Furthermore, if the holder is divided and a wire is held between the divided parts, the holder can be used as a wire clamp, simplifying the structure, and by combining the holders, The core can be easily arranged coaxially with the electric wire.

[Example] Hereinafter, an example of a voltage detection device embodying the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 and 2, a detection section l serving as a detection means is suspended from and supported by an electric wire 2 while gripping it, and detects line current and line voltage. The cylindrical insulating container 3 has a conductive joint plate 4
The detection unit 1 is connected to the lower surface of the detection unit 1 via the insulating jacket 5, and an insulating jacket 5 having insulating folds 5a is fitted around its outer periphery.

Therefore, the configuration of the detection section 1 will be described in detail.
As shown in the figure and FIG. 3, the core 6 made of a magnetic material is
The upper core 6A has an inverted U-shape in front, and a pair of lower cores 6B has an L-shape in front.

It is divided into 6C. Further, the conductive holder 7 is divided into an upper holder 7A having an inverted U-shape when viewed from the front, and a lower holder 7B having an approximately U-shape from the front. Then, with the upper core 6A joined to the lower surface of the upper holder 7A, a rubber mold 8 is applied to the outer surfaces of the upper core 6A, so that they are fixed integrally, and the lower core 6B
, 6C are joined to the upper surface of the lower holder 7B, and by applying a rubber mold 9 to their outer peripheries, they are integrally fixed.

As shown in FIGS. 1 to 3, a pair of tightening portions 10.11
are formed protrudingly on both sides of the upper holder 7A and the lower holder 7B, and these tightening parts 10.11 are connected to the spacer 12.
The cores 6A, 6B, and 6C are clamped in a state surrounding the electric wire 2 by inserting a bolt 13 between the two wired portions 10.11 and tightening them with a nut 14. A plurality of mounting pieces 15 are formed to protrude from the bottom plate portion of the lower holder 7B, and by screwing a plurality of bolts 16 to the joint plate 4 through the mounting pieces 15, the joint plate 4 is attached to the lower surface of the detection unit 1. is electrically connected to and fixed to the lower holder 7B, and the joint plate 4 is fixed by inserting a plurality of bolts 17 into the joint plate 4 from the lower surface of the upper end flange portion 3a of the insulating container 3 and tightening them with nuts 18. An insulating container 3 is attached to the lower surface of the insulating container 3.

A through hole 19 is formed in the center of the lower holder 7B to match the gap between the opposing ends of the lower cores 6B and 6C, and a through hole is also formed in the center of the joint plate 4 to correspond to the through hole 19. 20 are provided. Magnetic field sensor head 2
1 is the lower core 6B.

Gap between opposite ends of 6C and through hole 19 of lower holder 7B
By applying the rubber mold 9 in the state where the lower cores 6B and 6C are inserted, the lower cores 6B and 6C are integrally interposed and fixed,
When the joint plate 4 is attached, it is arranged to protrude into the through hole 20 thereof.

A pair of mounting grooves 22 are formed to face each other on the side inner surfaces of the lower cores 6B and 6C, and an electrode support plate 23 made of an insulating plate is installed between the mounting grooves 22. The first electrode 24 is positioned between the lower cores 6B, 6C and the electric wire 2,
They are fixed to the upper surface of the electrode support plate 23 with screws 25, and by applying the rubber mold 9 with the electrode support plate 23 and the first electrode 24 attached, they are attached to the lower cores 6B, 6C.
are fixed integrally between them. In this embodiment, the holder 7 constitutes a second electrode that faces the first electrode 24, and the holder 7 serving as the second electrode is arranged around the core 6 and the first electrode 24 in an annular manner. There is.

As shown in FIG. 1, the insulating substrate 26 is disposed within the insulating container 3, and a mounting plate 27 is erected on the upper surface thereof. The capacitor 28 and voltage sensor head 29 are mounted on the mounting plate 2.
7 , and is connected to the first electrode 24 and the holder 7 as the second electrode via a lead wire 30 .

As shown in FIGS. 1 and 4, a pair of guide portions 31 consisting of two protrusions 31a are provided oppositely on the lower halves of both sides of the inner surface of the insulating container 3, and are parallel to the axial direction of the insulating container 3. It extends to

The signal lines 32 and 33 made of optical fibers are connected at their upper ends to the magnetic field sensor head 21 in the detection section 1 or the voltage sensor head 29, and are inserted through the insulating substrate 26. The tension wire 34 is fixed to the insulating substrate 26 at its upper end, and is housed in the protection tube 35 in a state in which it is aligned with the signal wires 32 and 33. It is pulled out through a protective cover 36 that is fitted and fixed to the. Holder 3
7 is the protective tube 3 to hold the signal line 32.33
5, and is composed of a pair of clamping bodies 38 and bolts 39.

A pair of locking protrusions 40 are provided on the outer periphery of the holder 37, and the locking protrusions 40 are vertically movably locked to the guide portion 31 inside the insulating container 3, thereby restricting rotation of the holder 37. This prevents twisting and deformation of the signal lines 32 and 33.

An elastic insulating layer 41 made of urethane rubber or the like with excellent adhesive properties is filled and formed in the lower half of the insulating container 3, and the insulating substrate 26, the holder 37 and the signal line 3 are placed in the insulating layer 41.
2.33 is contained.

A high viscosity insulating fluid 42 made of silicone grease or the like is filled in the upper half of the insulating container 3.
A capacitor 28, a voltage sensor head 29, and connection portions of lead wires 30 and signal wires 32 thereto are immersed therein.

Next, the operation of the voltage detecting device configured as described above will be explained.

Now, in this voltage detection device, the core 6 is the upper core 6A.
and a pair of lower cores 6B, 6C, and the magnetic field sensor head 21 is interposed between the divided portions of the lower cores 6B, 6C. 21, and line current, etc., can be accurately detected for each phase. Moreover, according to this configuration, there is no need to secure a large accommodation space for the magnetic field sensor head 21 within the insulating container 3, so that
The entire device becomes compact, and since there is no need to connect the core 6 and the magnetic field sensor head 21 with a Leet wire, the connection work can be easily performed.

Furthermore, in this embodiment, the holder 7 is divided into an upper holder 7A and a lower holder 7B, and the electric wire 2 is held between the divided parts.
can be used as a wire clamp, simplifying the structure, and by combining the upper holder 7A and the lower holder 7B, the cores 6A, 6B, 6
C can be easily arranged coaxially with respect to the electric wire 2.

Further, in the embodiment, the first electrode 2 provided on the electrode support plate 23
4 and the lower holder 7B, the voltage of the electric wire 2 can be divided into parts and detected by the voltage sensor head 29.

Note that the present invention is not limited to the configuration of the above-mentioned embodiments. For example, the holder 7 may be configured integrally without being divided into upper and lower parts, and the core 6 may be attached to the wire using a wire clamp or the like. It is also possible to change the structure of each part arbitrarily and embody it without departing from the spirit of the invention.

[Effect of the invention] Since this invention is configured as explained above,
It has the following excellent effects:

(1) According to the invention set forth in claim 1, since the core is divided and the magnetic field sensor head is interposed between the divided parts, the influence of other phases in the three-phase electric line appears on the sensor head. Therefore, the detection accuracy can be improved. Moreover, according to this configuration, there is no need to secure a large housing space for the sensor head in the insulating container, and the entire device can be downsized. There is no need to connect, which simplifies the connection work.

(2) According to the invention set forth in claim 2, the holder is divided into parts and the electric wire is held between the divided parts, so that the holder can be used as a wire clamp, simplifying the structure. In addition, the core can be easily arranged coaxially with respect to the electric wire.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing one embodiment of a voltage detection device embodying the present invention, Fig. 2 is a side view of the main parts thereof, Fig. 3 is an exploded perspective view showing the main parts, and Fig. 4 The figure is A- in Figure 1.
It is an A-line sectional view. 2... Electric wire, 3... Insulating container, 6... Core, 6A
... Upper core, 6B, 6C... Lower core, 7...
Holder, 7A... Upper holder, 7B... Lower holder, 21... Magnetic field sensor head, 32... Signal line. Patent applicant Nippon Insulator Co., Ltd. Agent
Patent attorney On 1) Hironobu (and 1 other person)

Claims (1)

[Claims] 1. A core (6) made of a magnetic material is attached to a holder (7) and arranged so as to surround the electric wire (2), and the holder (7) is attached to an insulating container (3). ), the core (6) is divided, a magnetic field sensor head (21) is interposed between the divided parts, and the signal line (32) of this sensor head (21) is connected to the insulating container (3). A voltage detection device characterized by being pulled out from one end. 2. The voltage detection device according to claim 1, wherein the holder (7) is divided into parts, and the electric wire (2) is held between the divided parts.