JP7618170B2 - Short circuit grounding device - Google Patents

Description

The present invention relates to a short-circuit grounding device used to prevent the risk of electric shock due to erroneous energization, contact with other electrical circuits, or induction from other electrical circuits when performing maintenance, inspection, etc. of electric power equipment.

For example, when replacing overhead distribution lines or utility poles, power is cut off to the distribution lines in the work area, and a voltage tester is used to confirm a power outage. In addition, to prevent the risk of electric shock due to accidental energization, contact with other electrical circuits, or induction from other electrical circuits, short-circuit earthing devices are attached to the distribution lines in the work area to ground them.

If power supply is resumed after maintenance, inspection, or other work is completed with the short-circuit earthing device still installed, there is a risk of a ground fault or short circuit accident occurring. Therefore, the short-circuit earthing device must be removed after work is completed, but there is a possibility of forgetting to remove it due to human error. Therefore, technology has been proposed to prevent forgetting to remove the short-circuit earthing device after work is completed.

For example, in the following Patent Document 1, when the clamp (ground connection part) of the grounding device is attached to the grounding member, the wireless transmitter is activated and transmits position information of the grounding device wirelessly, and when the clamp is not attached to the grounding member, the wireless transmitter is stopped and does not transmit position information of the grounding device. The position information of the grounding device transmitted from the wireless transmitter makes it possible to confirm that the grounding device has not been removed and to identify the position of the grounding device.

JP 2009-247044 A

In Patent Document 1, the wireless transmitter is started and stopped by detecting whether the clamp (ground connection part) of the grounding device is attached to the grounding member, regardless of whether the hook (electric wire connection part) of the grounding device is connected to the power distribution line. Therefore, in Patent Document 1, even if the hook is not connected to the power distribution line, if the clamp is attached to the grounding member, the wireless transmitter is started and the position information of the grounding device is transmitted. Conversely, even if the hook is forgotten to be removed from the power distribution line, if the clamp is removed from the grounding member, the wireless transmitter is stopped and the position information of the grounding device is not transmitted. In other words, in Patent Document 1, it is not possible to detect and confirm whether the grounding device is attached to the power distribution line or whether the grounding device has been removed from the power distribution line.

When grounding a three-phase distribution line with a short-circuit grounding device, it is important to check whether each device body of the short-circuit grounding device is correctly connected to the distribution line of each phase of the three-phase distribution line and whether each device body of the short-circuit grounding device has been removed from the distribution line of each phase of the three-phase distribution line.

The objective of the present invention is to provide a short-circuit grounding device that can detect and confirm whether each device body of the short-circuit grounding device is correctly connected to the distribution line of each phase of a three-phase distribution line, and whether each device body of the short-circuit grounding device has been removed from the distribution line of each phase of a three-phase distribution line.

To solve the above problems, the present invention provides a short-circuit grounding device comprising a device body attached to each phase of a three-phase distribution line, a short-circuit wire electrically connecting the device bodies to each other, and a ground wire electrically connected to a grounding member, wherein the device body comprises an electric wire connection part electrically connected to the distribution line and an attachment/detachment information communication part, and the attachment/detachment information communication part comprises a sensor that detects an electrical connection between the electric wire connection part and the distribution line, and a wireless transmission part that, when the sensor detects the electrical connection, determines that the device body is attached to the distribution line and transmits the information wirelessly, and, when the sensor does not detect the electrical connection, determines that the device body is removed from the distribution line and transmits the information wirelessly.

The short-circuit grounding device of the present invention can detect and confirm whether each device body of the short-circuit grounding device is correctly connected to the distribution line of each phase of the three-phase distribution line, and whether each device body of the short-circuit grounding device has been removed from the distribution line of each phase of the three-phase distribution line.

FIG. 2 is a front view showing the short-circuit grounding device according to the embodiment. 2A is an enlarged view of the electric wire connection part, in which FIG. 2A shows the movable part rotated clockwise to widen the gap with the receiving part, and FIG. 2B shows the movable part rotated counterclockwise to clamp the electric wire between the receiving part and the movable part. FIG. 4 is a block diagram of a mounting/removal information communication unit. FIG. 4 is a block diagram of a position information communication unit.

The following describes an embodiment of the present invention with reference to the drawings.

Figure 1 shows a short-circuit grounding device according to an embodiment. The short-circuit grounding device of this embodiment is used to short-circuit and ground a three-phase overhead distribution line, and includes device bodies 1, 2, and 3 that are attached to the distribution lines of each phase of the three-phase distribution line, short-circuit wires 4 and 5 that electrically connect the device bodies 1, 2, and 3 to each other, and a ground wire 6 that is electrically connected to a grounding member. The short-circuit wire 4 is connected to the device bodies 1 and 2, and the short-circuit wire 5 is connected to the device bodies 2 and 3. The ground wire 6 is connected to the device body 2, and is connected to the grounding member via the ground connection portion 6a.

The device bodies 1, 2, and 3 each include an insulating operating rod 1a, 2a, and 3a, an electric wire connection portion 1b, 2b, and 3b that is provided at the tip of the operating rod 1a, 2a, and 3a and electrically connected to a power distribution line, and an attachment/detachment information communication portion 1c, 2c, and 3c. The configurations of the electric wire connection portions 1b, 2b, and 3b are the same as each other, and the configurations of the attachment/detachment information communication portions 1c, 2c, and 3c are also the same as each other. Below, the electric wire connection portion 1b and the attachment/detachment information communication portion 1c will be described with reference to Figures 2 and 3, and a description of the electric wire connection portions 2b and 3b and the attachment/detachment information communication portions 2c and 3c will be omitted.

As shown in an enlarged view in FIG. 2, the electric wire connection part 1b includes a conductive receiving part 1b1 attached to the tip of the operating rod 1a, and a conductive movable part 1b2 movable relative to the receiving part 1b1. As shown in FIG. 2(a), the movable part 1b2 is movably attached to the receiving part 1b1, and can be rotated around the pivot 1b11 by a rotation mechanism (not shown) provided on the receiving part 1b1. The rotation mechanism is operated by rotating the operating rod 1a. For example, when the operating rod 1a is rotated in one direction, the movable part 1b2 rotates counterclockwise in the figure, and when the operating rod 1a is rotated in the other direction, the movable part 1b2 rotates clockwise in the figure. When the electric wire connection part 1b is connected to the electric power distribution line X, the movable part 1b2 is rotated clockwise to widen the gap with the receiving part 1b1, and the movable part 1b2 is rotated counterclockwise with the electric power distribution line X inserted between them. Then, as shown in FIG. 2(b), the gap between receiving portion 1b1 and movable portion 1b2 narrows, and distribution line X is clamped between receiving portion 1b1 and movable portion 1b2. This connects electric wire connection portion 1b to electric wire X. To release the connection to distribution line X, movable portion 1b2 is rotated clockwise from the state shown in FIG. 2(b) to return to the state shown in FIG. 2(a). This releases the connection between electric wire connection portion 1b and distribution line X, and electric wire connection portion 1b can be removed from distribution line X.

In this embodiment, the attachment/detachment information communication unit 1c is provided on the movable part 1b2 of the electric wire connection part 1b, and includes a sensor 1c1 and a wireless transmission unit 1c2, which will be described later.

Sensor 1c1 is a contact sensor having contact 1c11 protruding from the inner surface of movable part 1b2. As shown in FIG. 2(b), when distribution line X is clamped between receiving part 1b1 and movable part 1b2 and contact 1c11 of sensor 1c1 comes into contact with distribution line X, sensor 1c1 detects that wire connection part 1b is electrically connected to distribution line X. If distribution line X is a coated wire (a bare wire coated with an insulating coating layer), wire connection part 1b is connected to a location where the coating layer is removed to expose the bare wire. If wire connection part 1b is connected to a location where there is a coating layer, sensor 1c1 does not detect electrical connection with the coated wire.

Figure 3 is a block diagram of the attachment/detachment information communication unit 1c. In this embodiment, the attachment/detachment information communication unit 1c includes the above-mentioned sensor 1c1, a wireless transmitter 1c2, a power source 1c3 such as a battery, and a power switch 1c4.

When the power switch 1c4 is turned ON and the power source 1c3 is turned on, the wire connection part 1b of the device body 1 is placed against the power distribution line X, and the operating rod 1a is rotated to clamp the power distribution line X between the receiving part 1b1 and the movable part 1b2. The inner surface of the receiving part 1b1 and the contact 1c11 of the sensor 1c1 come into contact with the power distribution line X, forming an electric circuit including the receiving part 1b1, the movable part 1b2, the power distribution line X, and the sensor 1c1, and a current flows through the electric circuit. The sensor 1c1 detects that the wire connection part 1b is electrically connected to the power distribution line X by this current, and outputs a detection signal S to the wireless transmitter 1c2. When the wireless transmitter 1c2 receives the detection signal S from the sensor 1c1, it determines that the device body 1 is attached to the power distribution line X, and wirelessly transmits this information (attachment information T1).

On the other hand, when the electric wire connection part 1b of the device body 1 is removed from the power distribution line X, the electrical connection between the electric wire connection part 1b and the power distribution line X is released, and the sensor 1c1 does not output the detection signal S. When the detection signal S is not input from the sensor 1c1, the wireless transmitter 1c2 determines that the device body 1 has been removed from the power distribution line X, and wirelessly transmits that information (removal information T2).

When the power switch 1c4 is turned OFF and the power source 1c3 is cut off, the wireless transmitter 1c2 stops operating and does not transmit either the attachment information T1 or the removal information T2. However, when the power switch 1c4 is OFF and the electric wire connection part 1b is electrically connected to the power distribution line X, the power switch 1c4 may be automatically turned ON and the attachment information T1 may be transmitted (automatic ON function of the power switch). Also, when there is no electrical connection between the electric wire connection part 1b and the power distribution line X and the removal information T2 is being transmitted, in order to prolong the life of the power source 1c3 (battery), the power switch 1c4 may be automatically turned OFF after a predetermined time has elapsed and the removal information T2 may not be transmitted (automatic OFF function of the power switch).

The above-mentioned installation information T1 is transmitted in real time from the wireless transmitter 1c2 while the sensor 1c1 detects the electrical connection between the electric wire connection part 1b and the power distribution line X and outputs the detection signal S (real-time notification mode), or is transmitted at regular intervals from the wireless transmitter 1c2 (public notification mode), or is transmitted from the wireless transmitter 1c2 when the sensor 1c1 first detects the electrical connection between the electric wire connection part 1b and the power distribution line X and first outputs the detection signal S after the power source 1c3 is turned on (installation notification mode). It is preferable that these notification modes of the installation information T1 can be appropriately selected and switched taking into account circumstances such as reducing consumption of the power source 1c3. The above-mentioned removal information T2 is transmitted in real time from the wireless transmitter 1c2 while the electrical connection between the electric wire connection portion 1b and the power distribution line X is released and the sensor 1c1 is not outputting the detection signal S (real-time notification mode), or is transmitted periodically from the wireless transmitter 1c2 (public notification mode), or is transmitted from the wireless transmitter 1c2 when the detection signal S from the sensor 1c1 is interrupted (removal notification mode). It is preferable that the notification mode of the removal information T2 can be appropriately selected and switched in consideration of circumstances such as reducing consumption of the power source 1c3.

The above attachment information T1 and removal information T2 are also transmitted from the attachment/removal information communication units 2c and 3c of the device bodies 2 and 3 in the same manner as above.

The electric wire connection parts 1b, 2b, 3b of the fixture bodies 1, 2, 3 are electrically connected to the distribution lines of each phase of the three-phase distribution line, and the ground wire 6 is electrically connected to the grounding member via the ground connection part 6a, but the attachment/detachment information communication parts 1c, 2c, 3c transmit attachment information T1 and removal information T2 regardless of whether the ground wire 6 is connected or not as long as their power switches are ON. This makes it possible to detect and confirm whether the fixture bodies 1, 2, 3 are correctly attached to the distribution lines of each phase of the three-phase distribution line, and whether the fixture bodies 1, 2, 3 are correctly removed from the distribution lines of each phase of the three-phase distribution line.

For example, if the appliance bodies 1 and 2 are attached to two-phase distribution lines of a three-phase distribution line, but the appliance body 3 has been forgotten to be attached to the remaining one-phase distribution line, attachment information T1 is transmitted from the attachment/detachment information communication units 1c and 2c of the appliance bodies 1 and 2, respectively, and removal information T2 is transmitted from the attachment/detachment information communication unit 3c of the appliance body 3. The attachment information T1 transmitted from the attachment/detachment information communication units 1c and 2c makes it possible to confirm that the appliance bodies 1 and 2 are correctly attached to the two-phase distribution lines, and the removal information T2 transmitted from the attachment/detachment information communication unit 3c makes it possible to confirm that the appliance body 3 has been forgotten to be attached to the remaining one-phase distribution line.

For example, in the case where the three-phase distribution line is a covered electric wire, the device bodies 1 and 2 are attached to the two-phase distribution line where the covering layer has been removed, but the device body 3 is attached to the remaining one-phase distribution line without removing the covering layer, attachment information T1 is transmitted from the attachment/detachment information communication units 1c and 2c of the device bodies 1 and 2, respectively, and removal information T2 is transmitted from the attachment/detachment information communication unit 3c of the device body 3. The attachment information T1 transmitted from the attachment/detachment information communication units 1c and 2c makes it possible to confirm that the device bodies 1 and 2 are correctly attached to the two-phase distribution line, and the removal information T2 transmitted from the attachment/detachment information communication unit 3c makes it possible to confirm that the device body 3 is not correctly attached to the remaining one-phase distribution line.

For example, if the appliance bodies 1 and 2 are removed from a two-phase distribution line of a three-phase distribution line, but the appliance body 3 is forgotten to be removed from the remaining one-phase distribution line, removal information T2 is transmitted from the attachment/detachment information communication units 1c and 2c of the appliance bodies 1 and 2, respectively, and attachment information T1 is transmitted from the attachment/detachment information communication unit 3c of the appliance body 3. The removal information T2 transmitted from the attachment/detachment information communication units 1c and 2c makes it possible to confirm that the appliance bodies 1 and 2 have been removed from the two-phase distribution line, and the attachment information T1 transmitted from the attachment/detachment information communication unit 3c makes it possible to confirm that the appliance body 3 has been forgotten to be removed from the remaining one-phase distribution line.

As shown in Fig. 1, the short-circuit grounding device of this embodiment further includes a position information communication unit 7 that wirelessly transmits position information of the short-circuit grounding device. The position information communication unit 7 is attached to, for example, the operating rod 2a of the device body 2. The position information communication unit 7 is, for example, a GPS (Global Navigation Satellite System) (GNSS)
As shown in Fig. 4, the device is composed of a Global Navigation Satellite System (Global Navigation Satellite System) unit, and includes a position information receiver 7a that receives time-stamped position information P1 from a plurality of positioning satellites, a wireless transmitter 7b that calculates its own current position from the position information P1 received by the position information receiver 7a and wirelessly transmits position information P2 (with time) of the current position, a power source 7c, and a power switch 7d. When the power switch 7d is turned ON and the power source 7c is turned on, the position information P2 of the short-circuit grounding device is wirelessly transmitted from the wireless transmitter 7b.

The attachment information T1 and removal information T2 wirelessly transmitted from the attachment/detachment information communication units 1c, 2c, and 3c of the device main bodies 1, 2, and 3, and the position information P2 wirelessly transmitted from the position information communication unit 7 of the device main body 2 are received by an electronic terminal device such as a mobile terminal (smartphone, tablet terminal, etc.) or a PC terminal, and displayed on the display of the electronic terminal device. From the attachment information T1, removal information T2, and position information P2 displayed on the electronic terminal device, workers and managers can check the position of the short-circuit grounding device (position for grounding), whether the device main bodies 1, 2, and 3 are correctly attached to the distribution lines of each phase of the three-phase distribution line, and whether the device main bodies 1, 2, and 3 have been left unattached. In addition, the attachment information T1 and removal information T2 wirelessly transmitted from the attachment/detachment information communication units 1c, 2c, and 3c of the device main bodies 1, 2, and 3, and the position information P2 wirelessly transmitted from the position information communication unit 7 of the device main body 2 are stored in a server. Workers and managers can access the server from their own electronic terminal devices to obtain installation information T1, removal information T2, and location information P2. In addition, by importing the installation information T1, removal information T2, and location information P2 into an installation diagram (electronic data) of a three-phase distribution line in an electrical facility and plotting and displaying the installation information T1 and removal information T2 of the device bodies 1, 2, and 3 of each short-circuit grounding device on the installation diagram to create a mapping, it is possible to quickly check the installation positions and construction sections of each short-circuit grounding device, and the installation and removal status of the device bodies 1, 2, and 3 of each short-circuit grounding device at a bird's-eye view.

1: Main body 1a; Operation rod 1b; Electric wire connection portion 1b1; Receiving portion 1b2; Rotating portion 1c; Attachment/detachment information communication portion 1c1; Sensor 1c11; Contact 1c2; Wireless transmission portion 2: Main body 2a; Operation rod 2b; Electric wire connection portion 2c; Attachment/detachment information communication portion 3: Main body 3a; Operation rod 3b; Electric wire connection portion 3c; Attachment/detachment information communication portion 7; Position information transmission portion X: Power distribution line

Claims (5)

A short-circuit grounding device includes a device body attached to each of the three-phase distribution lines, a short-circuit wire electrically connecting the device bodies to each other, and a ground wire electrically connected to a grounding member,
The short-circuit grounding device further includes a location information communication unit that wirelessly transmits location information of the short-circuit grounding device,
Each of the device bodies includes an electric wire connection unit electrically connected to the power distribution line and an attachment/detachment information communication unit,
The attachment/detachment information communication unit includes a sensor that detects an electrical connection between the electric wire connection unit and the power distribution line, and a wireless transmitting unit that, when the electrical connection is detected by the sensor, determines that the device body is attached to the power distribution line and transmits the information wirelessly, and, when the electrical connection is not detected by the sensor, determines that the device body has been detached from the power distribution line and transmits the information wirelessly. the electric wire connection part has a receiving part that contacts and receives the electric power distribution line and a movable part that is movable relative to the receiving part, and the movable part is moved in a direction approaching the receiving part to clamp the electric power distribution line between the receiving part and the movable part to connect the electric power distribution line, and the movable part is moved in a direction away from the receiving part to release the connection to the electric power distribution line,
2. The short circuit grounding device according to claim 1, wherein the sensor is provided on the movable portion and has a contact that electrically contacts the distribution line when the electric wire connection portion is connected to the distribution line. The short-circuit grounding device according to claim 2, characterized in that the detachable information communication unit is provided on the movable part. The short-circuit grounding device according to any one of claims 1 to 3, characterized in that the device body has an insulating operating rod, and the electric wire connection part is provided at the tip of the operating rod. 2. The short-circuit grounding device according to claim 1 , wherein the position information communication unit is provided in the device body that is attached to a distribution line of one phase of the three-phase distribution line.

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