JP2008130297A - Short circuit grounding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a short circuit grounding apparatus which is installed on a required place to secure safety of an operator when carrying out a power failure works for legal inspection of a high voltage power receiving facility and which is provided with a constitution to give an alarm so that removal will never be forgotten after completion of work. <P>SOLUTION: This is a short circuit grounding apparatus which is connected between a power line and a grounding wire constituting a power receiving facility, and is provided with a plurality of power lines cables 2 having a connection unit 3 to be attached and detached from the power lines, a grounding cable 11 which has a grounding fitting 12 to be attached and detached from the grounding wire, and furthermore, is provided with an alarm means 20 consisting of a light-emitting part or a sounding part and a power supply 25 to supply power to the alarm means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a short-circuit grounding device capable of preventing the occurrence of an accident due to resumption of power transmission after forgetting to remove the short-circuit grounding device after mounting the short-circuit grounding device and performing a power failure operation of the high-voltage power receiving facility. .

Power outage work for periodic maintenance and inspection of high-voltage power receiving equipment is stipulated by the Industrial Safety and Health Regulations, and the use of short-circuit grounding equipment is obligatory.
In the power outage work of the high-voltage power receiving equipment, as shown in FIG. 5A, the power line (aerial lead-in line) 111 is opened by opening the nearest section switch 110 of the high-voltage power receiving equipment 100 that is the object of the legal inspection work. While the power is shut off, the short-circuit grounding device 105 is connected between the input side (power line) 102 and the ground line 103 of the shut-off device 101 with the shut-off device 101 on the power receiving equipment side closed. In this state, tests and inspections of relays and transformers constituting the power receiving equipment will be performed. Even if power is accidentally supplied from the electric circuit side during inspection of the power receiving equipment due to a failure or incorrect operation of the classification switch, the safety of the operator can be ensured by connecting the short-circuit grounding device 105. it can.
As shown in FIG. 5B, the short-circuit grounding device 105 includes a plurality of power line cables 107 having terminal portions provided on the power line 102 and connecting / disconnecting devices 106, and a grounding fitting 108 that is attached to and detached from the grounding wire 103. Each of the power line cables and a grounding cable 109 that is electrically connected.
Patent Documents 1 and 2 disclose a short-circuit grounding device excellent in safety.

By the way, when conducting legal inspections for high-voltage power receiving equipment installed in large-scale facilities such as factories, universities, hospitals, etc., power outage work is carried out with a number of short-circuit grounding equipment connected to each place, so after work completion There is a possibility of human error to forget to remove the short-circuit grounding device. If the power is restored with the short-circuit grounding equipment attached, there is a risk that a serious accident such as a short circuit or ground fault will occur.
In particular, the shut-off device 101 is often placed in a metal case that is opened and closed by a door, and the short-circuit grounding device 105 connected to the shut-off device 101 placed in such a concealed place (particularly in a dark place) You may forget to remove. In addition, when working in an environment where the surroundings are dark, such as at night, oversight of the removal of the short-circuit grounding device tends to occur frequently.
Japanese Utility Model Publication No. 05-061958 JP 2002-152935 A

As mentioned above, short-circuit grounding equipment used when performing power outage work for legal inspection of high-voltage power receiving equipment may be forgotten to be removed when the number of used equipment is large or connected to a concealed location. Yes, if power is restored with the short-circuit grounding fixture attached, there is a risk of serious accidents.
Up to now, focusing on such problems, no improvement measures have been proposed to prevent forgetting to remove the short-circuit grounding device.

  The present invention has been made in view of the above, and when a power failure operation for legally checking a high-voltage power receiving facility is carried out, a short-circuit grounding device attached to a key point in order to ensure the safety of the worker, An object of the present invention is to provide a short-circuit grounding device having a configuration for alarming so as not to forget to remove it.

In order to achieve the above-mentioned object, the invention of claim 1 is a short-circuit grounding device connected between a power line and a grounding line constituting a power receiving facility, and has a plurality of connecting devices that are attached to and detached from the power line. A power line cable, and a grounding cable that has a grounding fitting to be attached to and detached from the grounding line and is electrically connected to the power line cable, an alarm unit comprising a light emitting unit or a ringing unit, and power to the alarm unit And a power supply to be supplied.
There is a risk that an accident may occur if a short-circuit grounding device is forgotten to be removed and then restored when a short-circuit grounding device is connected to a required location of a power receiving facility and then restored. In the present invention, the alarm means for appealing to the visual and auditory senses of the worker is provided, so that the user cannot forget to remove it.

According to a second aspect of the present invention, in the first aspect, the connector includes a switch that is turned on when the power line is connected and turned off when the connection is released, and the switch supplies power from the power source to the alarm unit. It is characterized by being turned on and off.
By providing a switch that activates the alarm means by turning it on by an operation of attaching the connection tool to the power line, it is possible to cope with a problem of forgetting to turn on the power switch.

According to a third aspect of the present invention, in the first or second aspect of the invention, the connecting device is a shed clip including a clamping piece and a grip portion, and the switch is a limit switch provided in the grip portion of the shed clip. And
According to a fourth aspect of the present invention, in any one of the first to third aspects, the light emitting unit is an LED, and a plurality of the LEDs are arranged along the outer surface of the grounding cable and / or the power line cable. And connected to the power source through a lead wire.

  According to the present invention, a plurality of power line cables having a power line and a connecting tool to be attached and detached, and a grounding cable having a grounding fitting to be attached to and detached from the ground line and electrically connected to each power line cable, a light emitting unit Or the alarm means comprising the ringing section and the power source for supplying power to the alarm means, the short-circuit grounding device will not be forgotten to be removed after the work is completed.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.
FIG. 1 is a diagram illustrating the entire configuration of a short-circuit grounding apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating the configuration of an example of alarm means. The description will be made with reference to FIG.
The short-circuit grounding device 1 is a means for protecting an operator from an electric shock or the like during a power failure operation by being connected between a power line 102 and a grounding line 103 constituting the high-voltage power receiving facility 100.
The short-circuit grounding device 1 includes three power line cables 2 having a connector 3 that is attached to and detached from a terminal portion provided on the power line 102 by manual operation, and a grounding fitting 12 that is attached to and detached from the ground line 103. A grounding cable 11 that is grounded by being electrically connected to the cable 2, an alarm unit 20 that includes a light emitting unit or a ringing unit, and a power source (for example, a 12V battery) 25 that supplies power to the alarm unit 20. I have.

The connection tool 3 is, for example, a hook clip, and is always attached in a direction in which each holding piece 3a is closed, a metal holding piece 3a that is pivotally supported to be opened and closed, a grip 3b that extends integrally from each holding piece 3a, and the holding piece 3a. And a spring (not shown). The gripping piece 3a can be opened by gripping the grip 3b with one hand and gripping it against the spring force. When the gripping force is released, both clamping pieces return to the closed state by the spring force.
Each of the power line cables 2 extending from each connection tool 3 is connected to a grounding cable 11. In other words, the three power line cables 2 are branched and connected from the branch portion provided at the end of the ground cable 11.
The grounding cable 11 has a grounding fitting 12 that is detachably connected to the grounding wire at the tip thereof.

The power supply 25 may be arranged at any location, but is configured to be able to supply power by connecting to a lead wire extending from the alarm means 20.
While connecting the three connectors 3 to the overhead lead-in wire extending from the three-phase power line to the power receiving facility, and connecting the grounding metal 12 to the ground wire, The legal inspection can be implemented. Specifically, the short-circuit grounding device 1 is connected between the input side (power line) of the interruption device and the ground line in a state where the interruption device 101 on the power receiving facility side is closed.
The short-circuit grounding device 1 of the present invention is an alarm means 20 for notifying (warning) that the short-circuiting grounding device is connected to the power receiving facility visually by light emission (including blinking) or by sounding audibly. It is characteristic that it has

As shown in the enlarged view of FIG. 2, the alarm means 20 according to this embodiment includes LEDs 21 arranged at a predetermined pitch on the outer peripheral surface of the power line cable 2, lead wires 22 connecting the LEDs 21, LEDs 21, and leads. And a covering layer 23 made of a transparent vinyl tube or the like formed on the outer surface of the power line cable 2 so as to cover the wire 22. The lead wire 22 is connected to a power source 25, and is configured to light or blink the LED by operating a switch for turning on and off the power source 25. Therefore, it is necessary to turn on the power switch whenever the short-circuit grounding device 1 is connected to a required part of the power receiving facility.
The LED 21 may be provided at an appropriate position of the connector 3 or may be provided on the grounding cable 11 side. Since the LED 21 continues to emit light (flashes) unless the power switch is turned off, it is easy to visually check the light emission state even during the daytime, and know that the short-circuit grounding fixture 1 is still connected. Can do. Moreover, if it is a dark place, the alarm effect by light emission can be heightened further.

By using a buzzer sound or other sound source as the alarm means 20, it is possible to easily know the presence and position of the short-circuit grounding device in a connected state using the sound as a clue.
Further, a warning means by light emission and a warning means by voice may be used in combination.
In the above embodiment, if the power switch is forgotten to be turned on, the alarm means 20 will not operate even if the short-circuit grounding device 1 is connected to the required location, so it is assumed that the removal of the short-circuit grounding device is forgotten.

FIG. 3 is an explanatory diagram showing a switch configuration for solving such a problem.
The connecting device 3 is operated when the gripping portion 3b is turned on when the clamping piece 3a is connected to the power line (when opened), thereby energizing the alarm means 20 with power from the power supply 25 and releasing the connection. A limit switch 30 is provided to stop the operation by shutting off the energization to the alarm means by turning off when it is turned off (when closed). When the alarm means 20 is the LED 21, the limit switch turns on and off the light emission of the LED, and when the alarm means is a sounding means such as a buzzer, the limit switch turns the buzzer on and off. .

  The limit switch 30 fixes a switch body 31 to the inner surface of one grip 3b, and a switch piece 32 extends from the switch body 31 toward the inner surface of the other grip. As shown in the figure, when the clamping piece 3a is closed, the gap between the two grips 3b is widened, so that the switch piece 32 is off, but the clamping piece 3a is opened and connected to the power line. When in the state, both the grips 3b approach each other, so that the switch piece 32 is pressed by the other grip and is turned on. When the limit switch 30 is turned on, the LED 21 emits light and issues an alarm.

  Next, FIG. 4 shows another example of the configuration of the limit switch for turning on / off the alarm means. This limit switch 35 is composed of a switch body 36 disposed inside one grip 3b, and a switch body 36. And a button-type switch piece 37 supported so as to be able to appear and retract. In the case of the limit switch 35, the switch piece 37 is turned on to energize the alarm means 20 when the grip 3b is grasped and both grips are approached. It is preferable that the outer surface of the limit switch 35 is covered with a waterproof cover 38 made of a rubber sheet or a resin sheet.

  According to the short-circuit grounding device provided with the limit switch according to each embodiment of FIG. 3 and FIG. 4, a switch for turning on / off the energization of the alarm means is arranged on the connection tool 3, and the connection tool 3 is opened and closed. Since the limit switch is turned on / off by an operation of attaching / detaching to / from the power line, the situation where the operation of the alarm means 20 is forgotten while the connector 3 is attached is eliminated. Therefore, it is possible to prevent an accident that may occur by recovery with the short-circuit grounding fixture connected.

1 is an explanatory diagram of the overall configuration of a short-circuit grounding apparatus according to an embodiment of the present invention. It is structure explanatory drawing of an example of an alarm means. It is a figure which shows the structural example of the limit switch which concerns on one Embodiment of this invention. It is a figure which shows the structural example of the limit switch which concerns on other embodiment of this invention. (A) is a schematic explanatory drawing of a high voltage | pressure power receiving installation, (b) is a structure explanatory drawing of the conventional short circuit grounding fixture.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Short-circuit grounding device, 2 ... Power line cable, 3 ... Connection tool, 3a ... Holding piece, 3b ... Grip, 11 ... Grounding cable, 12 ... Grounding metal fitting, 20 ... Alarm means, 21 ... LED, 22 ... Lead wire , 23 ... coating layer, 25 ... power source, 30 ... limit switch, 31 ... switch body, 32 ... switch piece, 35 ... limit switch, 36 ... switch body, 37 ... switch piece, 38 ... waterproof cover, 100 ... high voltage power receiving equipment DESCRIPTION OF SYMBOLS 101 ... Interrupting device 102 ... Power line 103 ... Grounding wire 105 ... Short-circuit grounding fixture 106 ... Connection tool 107 ... Power line cable 108 ... Grounding metal fitting 109 ... Grounding cable 110 ... Section switch

Claims (4)

A short-circuit grounding device connected between a power line and a ground line constituting a power receiving facility, comprising a plurality of power line cables having a connection tool that is attached to and detached from the power line, and a grounding fitting that is attached to and detached from the ground line. A cable for grounding that is electrically connected to each of the power line cables;
A short-circuit grounding device, comprising: an alarm unit including a light emitting unit or a ringing unit; and a power source for supplying electric power to the alarm unit. The connector includes a switch that is turned on when connected to the power line and turned off when the connection is released,
The short-circuit grounding device according to claim 1, wherein the switch turns on / off power supply from the power source to the alarm unit.   3. The short-circuit grounding device according to claim 1, wherein the connection tool is a hook clip including a sandwiching piece and a grip portion, and the switch is a limit switch provided in a grip portion of the hook clip.   The light emitting unit is an LED, and a plurality of the LEDs are arranged along the outer surface of the grounding cable or / and the power line cable, and are connected to the power source via a lead wire. The short-circuit grounding device according to any one of claims 1 to 3.

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