JP7429832B2 - short circuit grounding device - Google Patents

Description

The present invention relates to a short-circuit grounding device that facilitates short-circuiting and grounding three-wire electric wires on the switch side of a high-voltage power receiving panel during legal inspections of power receiving equipment.

Power receiving equipment undergoes legal inspections at regular intervals, and in order to ensure the safety of workers conducting inspections, short-circuit grounding devices are installed to prevent the risk of electric shock due to incorrect energization, contact with other electrical circuits, or induction. It is mandatory to ensure short-circuit grounding by using
Patent Document 1 (Japanese Unexamined Patent Publication No. 2002-152935) describes a grounding fitting (51), one grounding side cable (54), and connecting the grounding side cable (54) to three electric wire side cables (55). A branch terminal part (52) that branches, a conductive band clamping part (57) connected to the tip of each electric wire side cable (55), and an operation rod engaging part (56) attached to each conductive band clamping part (57). and an operating rod (60) (see especially paragraphs 0008-0010 and FIGS. 1 and 2).
When performing short-circuit grounding work, each conductive band (74) should be The operator then engages the operating rod (60) with the operating rod engaging portion (56) and holds the guide band holding portion (57) in the open state. By aligning the band contacting part (573) with both ends of the lead band (74) and rotating the operating rod (60) in a predetermined direction to close the lead band contact part (573), the lead band clamping part (57) can be held between the conductive bands (74) (see especially paragraph 0015 and FIG. 3).

Furthermore, Patent Document 2 (Japanese Patent No. 4180627) discloses a grounding short-circuit tool that can facilitate the work of short-circuiting a special high-voltage electric line to ground, which is a set of grounding metal fittings provided at the end. A grounding wire (180), three branch grounding wires (160), a screw terminal (170) installed at the tip of each branch grounding wire (160), a screw terminal holder (50), and an insulated operating rod ( 200) is disclosed (see especially paragraphs 0027, 0037 and FIGS. 5-7, 10).
When performing short-circuit grounding work, the screw terminal (170) and branch grounding wire (160) are fixed to the three screw terminals (110) for grounding and short-circuiting that have been installed in advance on the electric line (100). , the worker attaches the rotary tool part (51) of the screw terminal holder (50) to the tip of the insulated operating rod (200) via the joint part (52), and attaches the screw terminal (170) to the rotary tool part (51). After installing the hexagonal screw part (173) inside, rotate the insulated operating rod (200) and screw the male screw part (172) of the screw terminal (170) into the female screw part (113) of the screw terminal (110). By doing so, the screw terminal (170) and the branch ground wire (160) can be fixed to the screw terminal (110) (see especially paragraphs 0023, 0037 to 0040 and FIGS. 2, 4, and 5).

Further, Patent Document 3 (Japanese Unexamined Patent Application Publication No. 2013-13173) discloses a ground wire attachment device for attaching a ground wire to an arc horn provided on an overhead electric wire or an insulator, which includes a handle (12). , a holding part (14) having a fixed arm body (20) and a rotating arm body (22), and an operating body (26) that can reciprocate in the extending direction of the handle part (12) in the region on the proximal end side of both arms. ), the spring (28) that urges the operating body (26) toward the distal end, the fixed arm (20), and the spring (28) are fixed, and the proximal end and handle ( A ground wire attachment device is disclosed comprising a casing (16) movably housing a ground wire (12) and a ground wire (18) (see in particular paragraphs 0020-0023 and FIG. 1).
When attaching the ground wire, the wire conductor (A) and the ground wire (18) are made to be electrically connected by holding the wire conductor (A) between the clamping parts (14). (12), and move the rod part (26b) of the operating body (26) in the direction of the arrow (100) in Fig. 1(A) to connect the upper side part (26a) to the linear conductor ( A), then move the rod (26b) further in the direction of the arrow (100), and use the linear conductor (A) to force the rod (26b) against the clamping portion (14) with the spring (28). When pushed down against the urging force of 30), the upper surface part (26e) of the operating body (26) and the protrusion (22b) come into contact with each other, and the state in which the holding part (14) holds the linear conductor (A) is maintained. (See especially paragraph 0025 and Figures 1 and 2).

However, in the short-circuit grounding device described in Patent Document 1, when performing short-circuit grounding work, the conductor band holding part (57) attached to the tip of the operating rod (60) is inserted from directly in front of the conductor band (74). After aligning the contact portions (573) with both ends of the conductive band (74), the conductive band holding portion (57) is held between the conductive band (74) by closing the conductive band contact portion (573). It was not easy to position the contact portion (573), and it was necessary to leave the front of the guide band (74) wide open.
In addition, the grounding short-circuiting tool described in Patent Document 2 is configured to screw the male screw portion (172) of the screw terminal (170) into the female screw portion (113) of the screw terminal (110) during short-circuit earthing work. In order to fix the screw terminal (170) and branch grounding wire (160) to the screw terminal (110), it is necessary to work from directly in front of the female thread part (113), and the male thread part (172) and the female thread part ( 113) was not easy to screw together. It was also necessary to widen the front of the three screw terminals (110) for ground shorting.
Further, the ground wire attachment device described in Patent Document 3 moves the rod portion (26b) of the operating body (26), brings the upper side portion (26a) into contact with the linear conductor (A), and the rod portion ( 26b) is pressed down against the biasing force of the spring (28), the state in which the holding portion (14) holds the linear conductor (A) is maintained; It is limited to the case where it is held between the holding parts (14) from substantially orthogonal directions, and is not suitable for short-circuit grounding work for grounding members such as conductive bands installed in narrow spaces.

Japanese Patent Application Publication No. 2002-152935 Patent No. 4180627 Japanese Patent Application Publication No. 2013-13173

The present invention solves the above-mentioned problems and makes it possible to perform short-circuit grounding work on columnar grounding members installed in power receiving equipment etc. easily and reliably while preventing the risk of electric shock. This is our first priority.
Furthermore, the present invention makes it possible to perform short-circuit grounding work relatively easily even when the front surface of a grounding member installed in a narrow space such as a cubicle is not wide open. This is the second issue.

The invention according to claim 1 is a short-circuit grounding device for grounding a columnar grounding member installed on a power line,
comprising a gripping part capable of gripping the grounding member and a support part supporting the gripping part,
The gripping portion includes a fixed gripping portion fixed to the supporting portion, and a movable gripping portion that is pivoted to the supporting portion or the fixed gripping portion and whose tip side can be freely opened and closed with respect to the fixed gripping portion,
The support portion has an operation rod engaging portion that removably fixes the operation rod,
The supporting portion or the fixed gripping portion opens and closes the movable gripping portion and the shorting wire fixing portion that fixes the grounding wire that is electrically connected to the grounding metal fitting or the shorting wire connected to the grounding wire, and the movable gripping portion. It has an opening and closing mechanism that allows
The fixed gripping portion and the movable gripping portion each extend from a distal end toward a proximal end, and each has a groove portion having a shape corresponding to a side surface of the grounding member;
The opening/closing mechanism is characterized in that, with the operating rod attached to the operating rod engaging portion, the movable gripping portion can be opened and closed by operating the operating rod .

According to a second aspect of the present invention, in the short-circuit grounding device according to the first aspect, the fixed gripping portion or the movable gripping portion has a stepped portion on the proximal end side of the groove portion.

The invention according to claim 3 is the short-circuit grounding device according to claim 1 or 2, characterized in that the fixed grip part is pivoted to the support part and can be fixed at an appropriate position.

The invention according to claim 4 is the short-circuit grounding device according to any one of claims 1 to 3, wherein the movable grip part has a driven part protruding toward its base end, and the opening/closing mechanism is , a biasing means for biasing the movable gripping part in an opening direction or a closing direction with respect to the fixed gripping part, a slider for controlling the position of the driven part, and a slider moving means for moving the slider. Features.

According to the short-circuit grounding device of the invention according to claim 1, the fixed gripping portion and the movable gripping portion each extend from the distal end toward the proximal end and have a groove portion having a shape corresponding to the side surface of the grounding member, In addition, since it has an opening/closing mechanism that allows the movable grip to be opened and closed by operating the operating rod with the operating rod attached to the operating rod engaging portion, the operating rod can be attached to the operating rod engaging portion. If the grip part is opened at an appropriate angle and aligned with the tip of the grounding member, the earthing member can be easily inserted into the grip part, and if the movable grip part is moved in the closing direction after insertion, The side surface portion of the grounding member is brought into close contact with the groove portions of the fixed gripping portion and the movable gripping portion. Therefore, short-circuit grounding work on the columnar grounding member can be easily and reliably performed while preventing the risk of electric shock.

According to the invention according to claim 2, in addition to the effect of the invention according to claim 1, since the fixed gripping part or the movable gripping part has a stepped part on the proximal end side of the groove part, during short circuit grounding work, The grounding member can be easily positioned at an appropriate location inside the gripping portion by simply pushing the gripping portion until the tip of the grounding member hits the stepped portion.

According to the invention according to claim 3, in addition to the effects of the invention according to claim 1 or 2, the fixed grip part is pivoted to the support part and can be fixed at an appropriate position, so that the grounding member does not fit in the cubicle. Even if the product is installed in a narrow space such as inside a building, and the front of the grounding member is not wide open, it is possible to position and fix the fixed grip in advance in a direction that makes it easy to approach the grounding member. , short circuit grounding work can be performed relatively easily.

According to the invention according to claim 4, in addition to the effects of the invention according to any one of claims 1 to 3, the movable gripping part has a driven part protruding toward its base end, and the opening/closing mechanism consists of a biasing means for biasing the movable grip part in the opening or closing direction relative to the fixed grip part , a slider for controlling the position of the driven part, and a slider moving means for moving the slider. The movable gripping portion can be reliably opened and closed relative to the fixed gripping portion only by such means.

1 is a diagram showing the configuration of a three-phase AC device using a short-circuit grounding device according to Example 1. FIG. 1 is a diagram showing the configuration of a short-circuit grounding device according to Example 1. FIG. FIG. 3 is a diagram showing a state in which the short-circuit grounding device according to the first embodiment is brought close to a grounding member. FIG. 3 is a diagram showing a state in which the fixed grip portion of the short-circuit grounding device according to the first embodiment is bent and fixed.

Embodiments of the present invention will be described below with reference to Examples.
For convenience, in this specification, in FIGS. 1 and 2, the left side will be referred to as the distal end side, and the right side will be referred to as the proximal end side, and the left end portion of each member will be referred to as the distal end portion, and the right end portion will be referred to as the proximal end portion.

FIG. 1 is a diagram showing the configuration of a three-phase AC device using the short circuit grounding device 1 according to the first embodiment, FIG. 2 is a diagram showing the configuration of the short circuit grounding device 1 according to the first embodiment, and FIG. 1 is a diagram showing a state in which the short-circuit grounding device 1 according to the first embodiment is brought close to a stainless steel hexagonal nut (hereinafter referred to as "grounding member") 11.
As shown in FIG. 1, a three-phase AC device using the short-circuit grounding device 1 of Example 1 is connected to an alligator clip (hereinafter referred to as "grounding metal fitting") 2 connected to a grounding point, and a grounding metal fitting 2. The grounding wire 3 is electrically conductive, three shorting wires 4 are connected to the grounding wire 3, and a shorting grounding device 1 is connected to the three shorting wires 4, respectively.
Further, as shown in FIGS. 2 and 3, the short-circuit grounding device 1 of the first embodiment includes a grip part 12 that can grip the grounding member 11 installed on the electrical circuit, and a support part 13 that supports the grip part 12. It consists of
The grip portion 12 of the short-circuit earthing device 1 includes a fixed grip portion 14 and a movable grip portion 15, and the support portion 13 includes a fixed member 16, a slider 17, an operating rod engaging portion 18, and a tip portion that holds the slider 17. It consists of a threaded portion 19 fixed to the operating rod engaging portion 18 and an elastic member 20 disposed between the fixing member 16 and the operating rod engaging portion 18 to urge them apart.

The fixed grip part 14 is a stainless steel member that is thin at the distal end and thick at the base end, and the base end is pivotally attached to the upper surface of the fixed member 16, and can be fixed at an appropriate position by tightening the fixing nut 21. ing.
Like the fixed grip part 14, the movable grip part 15 is also a stainless steel member that is thin at the distal end and thick at the base end, and has a hemispherical driven part 22 protruding from the base end.
The proximal end of the movable gripping part 15 is pivotally attached to the proximal end of the fixed gripping part 14 by a rotation shaft 23, and the distal end side of the movable gripping part 15 is attached to the distal end side of the fixed gripping part 14. The movable grip part 15 can be opened and closed with respect to the fixed grip part 14 by a spring (not shown).
On the inner surfaces of the fixed gripping part 14 and the movable gripping part 15, there is a groove 24 extending from the distal end toward the proximal end, having a deep groove in the center, and a groove on both sides of the groove having a plane inclined at 30 degrees from the horizontal plane. 25 is formed so that the angle formed by the planes on both sides of the groove is 120°.
Furthermore, the proximal ends of the grooves 24 and 25 are stepped portions 26 and 27, and when the grounding member 11 is inserted into the grip portion 12 and reaches an appropriate depth, the tip of the grounding member 11 becomes a stepped portion. It collides with parts 26 and 27.
Further, a large number of V-shaped grooves 30 are provided on the inner side edges 28 and 29 of the fixed gripping part 14 and the movable gripping part 15 to prevent the wires from shifting when they are pinched. There is.
Since the gripping part 12 has such a configuration, when the grounding member 11 is inserted into the inside of the gripping part 12 and the movable gripping part 15 is moved in the closing direction with respect to the fixed gripping part 14, the groove part 24 , 25 are firmly held in close contact with the side surfaces of the grounding member 11. Further, even if the grounding member 11 is not provided, the electric wire that requires grounding is positioned between the fixed gripping part 14 and the movable gripping part 15, and the movable gripping part 15 is closed with respect to the fixed gripping part 14. When moved in this direction, the electric wire is held between the V-shaped grooves 30 of the fixed gripping part 14 and the movable gripping part 15.

The fixing member 16 of the support portion 13 is a stainless steel member having a recess 31 on the lower surface side in which the slider 17 can be accommodated, and a screw hole 32 on the proximal end of the recess 31 into which the threaded portion 19 can be screwed. A shorting line fixing part 33 for fixing the end of the shorting line 4 is provided on the top surface.
The slider 17 of the support portion 13 is a stainless steel member having a trapezoidal shape in plan view, a tapered surface 34 at the distal end, and a base end rotatably held by a threaded portion 19. The driven part 22 of the movable grip part 15 that is biased in the opening direction with respect to the fixed grip part 14 has a different taper surface 34 depending on the position of the slider 17 and the angle formed between the fixed grip part 14 and the fixed member 16. They are designed to make contact at certain positions.
The operating rod engaging portion 18 of the support portion 13 is made of stainless steel and has a threaded portion 19 fixed at its distal end and an insertion hole 35 for inserting the distal end of an operating rod (not shown) at its base end. The pin provided at the tip of the operating rod is inserted into the base end of the insertion hole 35, and the pin is received at the end by tightening the lock nut provided at the tip of the operating rod. A groove 36 is provided for fixing the operating rod.
Since the support portion 13 has such a configuration, when the operating rod engaging portion 18 or the operating rod fixed to the operating rod engaging portion 18 is rotated clockwise, the threaded portion 19 also rotates clockwise. As it rotates and moves toward the distal end, the slider 17 moves toward the distal end and the driven portion 22 moves downward, so that the movable gripping portion 15 moves in the closing direction with respect to the fixed gripping portion 14. Conversely, if the operating rod engaging portion 18 or the operating rod fixed to the operating rod engaging portion 18 is rotated counterclockwise, the threaded portion 19 will also rotate counterclockwise and move toward the proximal end. Accordingly, the slider 17 moves toward the base end and the driven section 22 moves upward, so that the movable grip section 15 moves in the opening direction relative to the fixed grip section 14.

FIG. 4 is a diagram showing a state in which the fixed grip part 14 of the short-circuit grounding device 1 according to the first embodiment is bent and fixed (the intersecting angle between the longitudinal direction of the fixed grip part 14 and the longitudinal direction of the fixed member 16 is 45 degrees). be.
In the state of FIG. 4, the driven part 22 moves toward the front side of the paper, but the tapered surface 34 has a width that allows it to come into contact with the driven part 22 in the range of movement of the driven part 22 perpendicular to the paper, so there is no short circuit. As in the case where the grounding device 1 is in the state shown in FIG. can be opened and closed with respect to the fixed grip part 14.

A procedure for attaching the grip part 12 of a three-phase AC device using the short circuit grounding device 1 according to the first embodiment shown in FIG. 1 to the grounding member 11 will be described.
In addition, open the electrical circuit of the target electrical facility in advance, confirm the power outage in the electrical circuit using a voltage detection device, discharge any residual charge, and then open the LBS (high-voltage AC load switch) in the cubicle. .
(1) Connect the grounding metal fitting 2 to the grounding point (pinch the grounding terminal with the alligator clip 2).
(2) Adjust and fix the fixed grip part 14 of the first short-circuit grounding device 1 at an angle with the fixing member 16 so that it becomes an angle that is easy to work with.
(3) Rotate the operating rod engaging portion 18 of the short-circuiting grounding device 1 and adjust the distance between the tips of the fixed gripping portion 14 and the movable gripping portion 15 to be slightly larger than the size of the grounding member 11.
(4) Insert and fix the operating rod into the operating rod engaging portion 18 of the short circuit grounding device 1.
(5) Hold the operating rod and insert the tip of the grip part 12 into the tip of the grounding member 11.
(6) Push the grip part 12 until the tip of the grounding member 11 hits the stepped parts 26 and 27.
(7) Rotate the operating rod clockwise to operate the grip portion 12 in the closing direction.
(8) For the second and third short-circuit grounding devices 1, follow the steps (2) to (7) above to attach their respective grips 12 to the grounding member 11.

Next, a procedure for removing the grip portion 12 attached by the above steps (1) to (8) from the grounding member 11 will be described.
(A) The operating rod inserted into and fixed to the operating rod engaging portion 18 of the first short-circuit grounding device 1 is rotated counterclockwise, and the grip portion 12 is operated in the direction of opening.
(B) Move the operating rod to pull out the grip portion 12 from the grounding member 11.
(C) Release the fixed state of the operating rod and remove it from the operating rod engaging portion 18.
(D) For the second and third short-circuit grounding devices 1, follow the steps (A) to (C) above, pull out the respective grips 12 from the grounding member 11, and remove the operating rod. from the operating rod engaging portion 18.
(E) Remove the grounding metal fitting 2 connected to the grounding point (remove the alligator clip 2 from the grounding terminal).

Modifications of the short-circuit grounding device according to the first embodiment will be listed.
(1) In Example 1, the grounding member installed on the electric line was a hexagonal nut made of stainless steel, but the grounding member may be of any shape as long as it is column-shaped and made of a conductive material. It may be.
(2) In Example 1, the gripping part and the support part were all made of stainless steel, and the support part was provided with a shorting wire fixing part for fixing the shorting wire, but the shorting wire fixing part could also be provided in the fixed gripping part. good.
In such a case, the fixed gripping part needs to be made of a conductive material such as stainless steel, but the supporting part and the movable gripping part need not be conductive.
(3) In Example 1, the gripping part and the support part were all made of stainless steel (conductor), and the movable gripping part was pivoted to the fixed gripping part, but the movable gripping part was pivoted to the support part and the tip side It is also possible to freely open and close the fixed grip part.
In such a case, since the shorting wire fixing part for fixing the shorting wire is provided to the supporting part and the movable gripping part is connected to the supporting part, the fixed gripping part does not need to be a conductor.
(4) In the first embodiment, the fixed grip part is pivoted to the support part and can be fixed at an appropriate position, but it may be directly fixed without being pivoted.

(5) In Example 1, the fixed gripping part and the movable gripping part have a groove extending from the distal end toward the proximal end, with a deep center, and both sides of the groove are planes inclined at 30 degrees from the horizontal plane. However, the deep groove in the center does not need to be formed.
In addition, since the groove in Example 1 is for gripping a hexagonal nut, if the grounding member is not a hexagonal nut (hexagonal columnar) but a columnar one, as in the modification of (1) above, In this case, it is necessary to form the groove portion in a shape corresponding to the side surface of the grounding member.
For example, if the grounding member is cylindrical, the groove should have an arcuate cross section with the same diameter as the cross section of the grounding member, and if the grounding member is a square prism, both sides should be inclined at 45° from the horizontal plane. If the grounding member has a regular octagonal prism shape, the groove portion may be a flat surface with both sides inclined at 22.5 degrees from the horizontal plane.
(6) In Example 1, the fixed gripping portion and the movable gripping portion had a groove portion extending from the distal end toward the proximal end, and the proximal end of the groove was a stepped portion. It may be omitted, and the step portion may be provided only on either the fixed gripping portion or the movable gripping portion.
(7) In the first embodiment, the movable grip part is biased in the opening direction relative to the fixed grip part, and the movable grip part is moved in the closing direction by moving the tapered surface of the slider provided on the support part. However, by biasing the movable grip in the closing direction and changing the inclination of the tapered surface, the movable grip can be operated in the direction of opening by moving the tapered surface. You can also do that.
Furthermore, instead of moving the tapered surface, linear motion may be converted into opening/closing movement of the movable grip using a link mechanism. In other words, the movable grip can be moved with the operating rod attached to the operating rod engaging portion. An opening/closing mechanism that can be opened and closed may be provided on the support section or the fixed grip section.

1 Shorting grounding device 2 Grounding metal fitting (crocodile clip) 3 Grounding wire 4 Shorting wire 11 Grounding member (hexagonal nut) 12 Gripping portion 13 Supporting portion 14 Fixed gripping portion 15 Movable gripping portion 16 Fixed member 17 Slider 18 Operation rod engagement Part 19 Threaded part 20 Elastic member 21 Fixed nut 22 Driven part 23 Rotating shaft 24, 25 Groove parts 26, 27 Step part 28, 29 Inner side edge 30 V-shaped groove 31 Recessed part 32 Screw hole 33 Shorting line fixing part 34 Tapered surface 35 Insertion hole 36 Fixing groove

Claims (4)

A short-circuit grounding device for grounding a columnar grounding member installed on a power line,
comprising a gripping part capable of gripping the grounding member and a support part supporting the gripping part,
The gripping portion includes a fixed gripping portion fixed to the supporting portion, and a movable gripping portion that is pivoted to the supporting portion or the fixed gripping portion and whose tip side can be freely opened and closed with respect to the fixed gripping portion,
The support portion has an operation rod engaging portion that removably fixes the operation rod,
The supporting portion or the fixed gripping portion opens and closes the movable gripping portion and the shorting wire fixing portion that fixes the grounding wire that is electrically connected to the grounding metal fitting or the shorting wire connected to the grounding wire, and the movable gripping portion. It has an opening and closing mechanism that allows
The fixed gripping portion and the movable gripping portion each extend from a distal end toward a proximal end, and each has a groove portion having a shape corresponding to a side surface of the grounding member;
The short-circuit earthing device is characterized in that the opening/closing mechanism is capable of opening and closing the movable grip portion by operating the operating rod in a state where the operating rod is attached to the operating rod engaging portion. The short-circuit grounding device according to claim 1, wherein the fixed gripping portion or the movable gripping portion has a stepped portion on the proximal end side of the groove portion. The short-circuit grounding device according to claim 1 or 2, wherein the fixed grip part is pivoted to the support part and can be fixed at an appropriate position. The movable gripping portion has a driven portion protruding toward its base end,
The opening/closing mechanism includes a biasing device that biases the movable grip portion in an opening direction or a closing direction with respect to the fixed grip portion, a slider that controls the position of the driven portion, and a slider moving device that moves the slider. The short-circuit grounding device according to any one of claims 1 to 3, characterized in that it consists of:

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