Short circuit grounding device

Abstract

To provide a short circuit grounding tool which can detect and confirm whether each tool body of the short circuit grounding tool is correctly connected with a distribution line of each phase of three-phase distribution lines or removed from the distribution lines.SOLUTION: A short circuit grounding tool comprises: tool bodies 1, 2, 3 attached to distribution lines of each phase of three-phase distribution lines, respectively; short circuit lines 4, 5; and a grounding line 6 electrically connected with a grounding member. The tool bodies 1, 2, 3 comprise: wire connection units 1b, 2b, 3b electrically connected with the distribution lines; and attachment / detachment information communication units 1c, 2c, 3c. The short circuit grounding tool comprises: a sensor which detects electric connection between the wire connection units 1b, 2b, 3b and the distribution lines; and a radio transmission unit which determines that the tool bodies 1, 2, 3 are attached to the distribution lines and transmits its information by radio when electric connection is detected by the sensor, and determines that the tool bodies 1, 2, 3 are detached from the distribution lines and transmits its information by radio when electric connection is not detected by the sensor.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a short-circuit earthing device used to prevent the risk of electric shock due to erroneous energization, contact with other electric circuits, or induction from other electric circuits when performing maintenance and inspection of electric power equipment. [Background technology]

[0002] For example, when carrying out work such as replacing overhead distribution lines or utility poles, the power supply to the distribution lines in the work area is stopped, 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 grounding devices are attached to the distribution lines in the work area to ground them.

[0003] If power supply is resumed after maintenance and inspection work is completed with the short-circuit earthing device still attached, there is a possibility of a ground fault or short circuit accident occurring, so the short-circuit earthing device must be removed after the work is completed, but there is a possibility of forgetting to remove it due to human error. Therefore, a technology has been proposed to prevent forgetting to remove the short-circuit earthing device after work is completed.

[0004] 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 to wirelessly transmit position information of the grounding device, and when the clamp is not attached to the grounding member, the wireless transmitter is stopped to not transmit the 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. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-247044 A Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, the start and stop of the wireless transmission unit is performed by detecting whether the clamp (ground connection part) of the grounding device is attached to the grounding member, and it is not related to whether the hook (electric wire connection part) of the grounding device is connected to the distribution line. Therefore, in Patent Document 1, even if the hook is not connected to the distribution line, if the clamp is attached to the grounding member, the wireless transmission unit is started and the position information of the grounding device is transmitted, and conversely, even if the hook is forgotten to be removed from the distribution line, if the clamp is removed from the grounding member, the wireless transmission unit 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 distribution line or whether the grounding device has been removed from the distribution line.

[0007] 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.

[0008] The present invention aims to provide a short-circuit grounding device that can detect and confirm whether or not 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 or not 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. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the present invention provides a short-circuit grounding device comprising an appliance body to be attached to each phase of a three-phase distribution line, a short-circuit wire electrically connecting the appliance bodies to each other, and a ground wire electrically connected to a grounding member, wherein the appliance bodies each comprise a wire connection portion electrically connected to the distribution line and a detachment information communication portion, and the detachment information communication portion comprises a sensor for detecting an electrical connection between the wire connection portion and the distribution line, and a wireless transmission portion for determining that the appliance body is attached to the distribution line when the electrical connection is detected by the sensor and transmitting this information wirelessly, and for determining that the appliance body has been detached from the distribution line when the electrical connection is not detected by the sensor. Effect of the Invention

[0010] According to the short-circuit grounding device of the present invention, it is possible to 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. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a front view showing the short-circuit grounding device according to the embodiment. [Diagram 2] These are enlarged views of the electric wire connection part. Fig. 2(a) shows the movable part rotated clockwise to widen the gap with the receiving part, and Fig. 2(b) shows the movable part rotated counterclockwise to clamp the electric wire between the receiving part and the movable part. [Diagram 3] FIG. 4 is a block diagram of a mounting / removal information communication unit. [Figure 4] FIG. 4 is a block diagram of a position information communication unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] 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 attached to the distribution lines of each phase of the three-phase distribution line, short-circuit wires 4 and 5 electrically connecting the device bodies 1, 2, and 3 to each other, and a ground wire 6 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 a ground connection portion 6a.

[0014] The device bodies 1, 2, and 3 each include an insulating operating rod 1a, 2a, and 3a, an electric wire connecting 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 electric wire connecting portions 1b, 2b, and 3b have the same configuration as each other, and the attachment / detachment information communication portions 1c, 2c, and 3c also have the same configuration as each other. Hereinafter, the electric wire connecting portion 1b and the attachment / detachment information communication portion 1c will be described with reference to Figs. 2 and 3, and a description of the electric wire connecting portions 2b and 3b and the attachment / detachment information communication portions 2c and 3c will be omitted.

[0015] 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 a 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 to be 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 the receiving portion 1b1 and the movable portion 1b2 narrows, and the power distribution line X is clamped between the receiving portion 1b1 and the movable portion 1b2. This connects the electric wire connection portion 1b to the power distribution line X. To release the connection to the power distribution line X, the 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 the electric wire connection portion 1b and the power distribution line X, and the electric wire connection portion 1b can be removed from the power distribution line X.

[0016] In this embodiment, the attachment / detachment information communication unit 1c is provided on the movable portion 1b2 of the electric wire connection portion 1b, and includes a sensor 1c1 and a wireless transmission unit 1c2, which will be described later.

[0017] The sensor 1c1 is a contact sensor having a contact 1c11 protruding from the inner surface of the movable part 1b2. As shown in FIG. 2(b), when the distribution line X is clamped between the receiving part 1b1 and the movable part 1b2 and the inner surface of the receiving part 1b1 and the contact 1c11 of the sensor 1c1 come into contact with the distribution line X, the sensor 1c1 detects that the electric wire connection part 1b is electrically connected to the distribution line X. If the distribution line X is a covered electric wire (an electric wire covered with an insulating covering layer), the covering layer is removed and the electric wire connection part 1b is connected to the exposed bare wire. If the electric wire connection part 1b is connected to the part with the covering layer, the sensor 1c1 does not detect the electrical connection with the covered electric wire.

[0018] 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 transmission unit 1c2, a power source 1c3 such as a battery, and a power switch 1c4.

[0019] With the power switch 1c4 turned on and the power source 1c3 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, whereby 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 the current, and outputs a detection signal S to the wireless transmitting part 1c2. When the wireless transmitting part 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 the information (attachment information T1).

[0020] On the other hand, when the electric wire connection part 1b of the fixture 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 therefore the sensor 1c1 does not output the detection signal S. When the detection signal S is not input from the sensor 1c1, the wireless transmission part 1c2 determines that the fixture body 1 has been removed from the power distribution line X, and wirelessly transmits that information (removal information T2).

[0021] When the power switch 1c4 is turned OFF and the power source 1c3 is cut off, the wireless transmission unit 1c2 stops operating and does not transmit either the attachment information T1 or the removal information T2, but when the power switch 1c4 is OFF and the electric wire connection unit 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). In addition, when there is no electrical connection between the electric wire connection unit 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 so that the removal information T2 is not transmitted (automatic OFF function of the power switch).

[0022] The above-mentioned attachment 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 portion 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 portion 1b and the power distribution line X and first outputs the detection signal S after the power source 1c3 is turned on (attachment notification mode). It is preferable that the notification mode of the attachment information T1 can be appropriately selected and switched in consideration of circumstances such as the reduction in 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 part 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 at regular intervals 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.

[0023] The above-mentioned attachment information T1 and detachment information T2 are also transmitted from the attachment / detachment information communication units 2c, 3c of the appliance bodies 2, 3 in the same manner as above.

[0024] 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 a grounding member via the ground connection part 6a, but the attachment / detachment information communication parts 1c, 2c, 3c transmit attachment information T1 and detachment information T2 as long as their power switches are ON, regardless of whether the ground wire 6 is connected or not. 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 detached from the distribution lines of each phase of the three-phase distribution line.

[0025] 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.

[0026] For example, in the case where the three-phase distribution line is a covered electric wire, if the appliance main bodies 1 and 2 are attached to the two-phase distribution line of the three-phase distribution line at the location where the covering layer has been removed, but the appliance main 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 appliance main bodies 1 and 2, respectively, and removal information T2 is transmitted from the attachment / detachment information communication unit 3c of the appliance main 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 main 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 appliance main body 3 is not correctly attached to the remaining one-phase distribution line.

[0027] Also, 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.

[0028] 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 GNSS The device is composed of a Global Navigation Satellite System (Global Navigation Satellite System) unit, and as shown in Fig. 4, is equipped with a location information receiver 7a that receives time-stamped location information P1 from a plurality of positioning satellites, a wireless transmitter 7b that calculates its own current location from the location information P1 received by the location information receiver 7a and wirelessly transmits location information P2 (with time) of the current location, 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 location information P2 of the short-circuit grounding device is wirelessly transmitted from the wireless transmitter 7b.

[0029] The attachment information T1 and removal information T2 wirelessly transmitted from the attachment / removal information communication units 1c, 2c, and 3c of the appliance main bodies 1, 2, and 3, and the position information P2 wirelessly transmitted from the position information communication unit 7 of the appliance 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, the worker or manager can check the position of the short-circuit grounding device (the position where the grounding is performed), whether the appliance 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 appliance 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 / removal information communication units 1c, 2c, and 3c of the appliance main bodies 1, 2, and 3, and the position information P2 wirelessly transmitted from the position information communication unit 7 of the appliance main body 2 are stored in a server. Workers and managers can access the server from their own electronic terminal devices to obtain the 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 the installation diagram (electronic data) of the three-phase distribution line in the electrical equipment 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 position and construction section 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 from a bird's-eye view. [Explanation of symbols]

[0030] 1. Equipment body 1a Operation rod 1b Wire connection part 1b1 Receiving part 1b2 Rotating part 1c Removable information communication unit 1c1 Sensor 1c11 contact 1c2 Radio transmitter 2. Equipment body 2a Operation rod 2b Wire connection part 2c Removable information communication unit 3. Equipment body 3a Operation rod 3b Wire connection 3c Removable information communication unit 7 Location Information Transmission Section X Power Distribution Line

Claims

1. 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.

2. 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.

3. 3. The short-circuit grounding device according to claim 2, wherein the attachment / detachment information communication unit is provided on the movable part.

4. 4. The short-circuit grounding device according to claim 1, wherein the device body comprises an insulating operating rod, and the electric wire connection portion is provided at the tip of the operating rod.

5. 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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