JP6108905B2 - Three-phase short-circuit grounding device and grounding method using the same - Google Patents

Description

  In order to perform construction safely when performing bypass construction etc. in high voltage distribution lines, this invention is to ground both ends outside the construction section so that current does not flow into the working section. The present invention relates to a three-phase short-circuit grounding device and a grounding attachment / detachment method using the grounding device.

  Conventionally, in a high-voltage distribution line, when replacing a wire in a certain section or replacing a utility pole, a bypass cable or the like is laid in advance in this section. In this laying work, the power supply is stopped once, and a three-phase short-circuit grounding device is attached to the high-voltage distribution line so as to surround the section, and is grounded through the grounding wire on the low-voltage side.

  Specifically, as described in the prior art section of Patent Document 1, the three-phase short-circuit grounding device is attached to the upper end of the operation rod at the base of the short-circuit grounding device body having a hook-shaped portion formed at the upper end. By screwing a screw rod and rotating the operation rod, the electric wire holding metal clamp attached to the top of the screw rod and the hook-shaped portion facing it are clamped and tightened. It is hung on. In this three-phase short-circuit grounding device, the grounding devices of each phase are connected to each other with a short-circuit wire, and a ground wire is derived from one of the three-phase short-circuit grounding devices and connected to a low-voltage grounding wire with a ground connector. Yes.

  In the conventional grounding attachment / detachment method, since the high-voltage distribution line is located at a position 6 to 10 m from the ground, the worker is placed on the bucket of the aerial work vehicle. Each of the short-circuit grounding devices is attached to the three-phase high-voltage wire at the tip of the insulating rod.

  Specifically, the work procedure is to lock and fix the short-circuit grounding device of the phase that grounds the high-voltage distribution line first, and then the other two-phase short-circuiting grounding devices to the other high-voltage distribution lines. . Therefore, as shown in FIG. 12, a hanger bar 51 is provided on one short-circuit grounding device main body 50 of the three short-circuiting grounding device main bodies 50, and the other two short-circuit grounding device main bodies 50 are suspended on both sides of the hanger bar 51. A three-phase short-circuit grounding device T has been developed that lowers and hooks them onto a high-voltage distribution line located at the center of the three phases at once. As a result, the operator attaches the three-phase short-circuit grounding device T from the bucket of the aerial work vehicle to the tip of the insulating rod, and temporarily fixes the three-phase short-circuiting grounding device T to the high-voltage distribution line located at the center of the three phases. By attaching other short-circuit grounding devices to each high-voltage distribution line one after another, quick and simple work became possible.

Japanese Utility Model Publication No. 63-45741

  However, the thing of the said FIG. 12 is a thing of a novel structure different from the conventional short-circuit grounding device main body, and especially the both sides of the short-circuit grounding device main body 50 of the center which connected the two shorting wires 52 and the earth wire 53. From the above, a unique one with a hanger bar 51 protruding from the other two short-circuit grounding devices 50 must be prepared. In the figure, reference numeral 54 denotes a ground connector connected to the tip of the ground wire 53.

  Therefore, such a three-phase short-circuit grounding device T has to be manufactured or purchased, which increases the cost and is not versatile. In addition, a locking device 55 having a fitting hole is provided at the lower end of the operation rod of each of the three-phase short-circuit grounding devices, and an operator engages the tip of the insulating rod from the bucket of an aerial work vehicle to the locking device 55. There is also a drawback that the operation rod must be rotated and the operation rod is rotated, and the operation is not easy.

  Also, depending on the site, the tree is close to the three-phase central high-voltage distribution line, and it may be difficult to attach the central short-circuit grounding device to the center of the three-phase high-voltage distribution line first. Since the three-phase short-circuit grounding device has a fixed structure or shape, the central short-circuiting grounding device must first be attached to the three-phase central high-voltage distribution line despite the proximity of the trees. Such a situation may occur both when the three-phase high-voltage distribution lines are arranged horizontally and when they are arranged vertically.

  Therefore, the present invention solves the problems of such a conventional three-phase short-circuit grounding device, and uses the existing three-phase short-circuiting grounding device to stably lock the other two short-circuiting grounding devices to one short-circuiting grounding device. Provided is a three-phase short-circuit grounding device that can be easily replaced with a structure having different locking positions of the other two short-circuit grounding devices in accordance with the situation in the field, and uses this three-phase short-circuit grounding device The purpose of this is to provide a grounding method that can quickly and safely ground the three-phase high-voltage distribution line according to the situation at the site.

  According to the first aspect of the present invention, a screw rod attached to the upper end of the operating rod is screwed into the base of the short-circuit grounding device main body having a hook-like portion formed at the upper end, and the operating rod is rotated to turn the top of the screw rod. Prepare the three short-circuit grounding device bodies to be hooked on the wire by clamping and tightening the electric wire between the attached wire holding metal fitting and the hook-shaped part facing it, In the three-phase short-circuit grounding device in which a ground connector is provided at the tip of the ground wire connected to the one short-circuit grounding device main body, the short-circuiting wire of any one of the short-circuiting grounding device main bodies A plate for fixing the covering portion of the end of the plate to the short-circuit grounding device body with a plurality of bolts is provided, a hanger bar is fixed to the outer surface of the plate with bolts, and a hanger bar protruding from the outer edge of the plate is provided. The other two It was freely hooked a short-circuit ground body of, was a three-phase short-circuit ground unit.

  The invention according to claim 2 is the three-phase short-circuit grounding device according to claim 1, wherein the hanger bar protrudes substantially horizontally from both side edges or one side edge of the plate.

  According to a third aspect of the present invention, in the first aspect, the hanger bar protrudes from the upper or lower edge of the plate into a substantially key shape or a substantially F shape so that the outer end of the hanger bar is substantially horizontal. The three-phase short-circuit grounding device described was used.

According to a fourth aspect of the present invention, the screw rod attached to the upper end of the operating rod is screwed into the base of the short-circuit grounding device main body having a hook-like portion formed at the upper end, and the operating rod is rotated to turn the top of the screw rod. Prepare the three short-circuit grounding device bodies to be hooked on the wire by clamping and tightening the electric wire between the attached wire holding metal fitting and the hook-shaped part facing it, In a three-phase short-circuit grounding device in which a ground connector is provided at the tip of the ground wire connected to one of these short-circuit grounding device bodies, the three short- circuiting grounding device main bodies are connected to each other. A bar-shaped hanger bar is fixed to the end of the two short-circuited wires of the short-circuit grounding device main body with the ends of the two short-circuited wires fixed with metal fittings or wires.
A three-phase short-circuit grounding device is provided in which a hanger bar protrudes from the two short-circuit wires, and the other two short-circuit grounding device bodies can be freely hooked on the protruding portion of the hanger bar.

  The invention according to claim 5 is the three-phase short-circuit grounding device according to claim 4, wherein the hanger bar fixed to the two short-circuit wires protrudes horizontally from both sides or one side of the two short-circuit wires. It was.

  According to a sixth aspect of the present invention, the hanger bar fixed to the two short-circuit wires is substantially keyed so that the outer end portion of the hanger bar is substantially horizontal from the upper part or the lower part of the two short-circuit line end parts. The three-phase short-circuit grounding device according to claim 4, wherein the three-phase short-circuit grounding device protrudes into a mold or a substantially F-shape.

The invention according to claim 7 uses the three-phase short-circuit grounding device according to any one of claims 1 to 3 in the plate or the hanger bar having a plurality of types of hanger bars having different shapes according to the situation at the site. This is selected and attached to the short-circuit grounding device main body. First, the three-phase high-voltage distribution line is attached to the short-circuit grounding device main body with two short-circuit grounding device members hung on the hanger bar. A high-voltage distribution line grounding attachment / detachment method was adopted.

  According to each invention of Claims 1-3, the plate which hold | suppresses the coating | coated part of the edge part of the short circuit wire of the existing three-phase short circuit grounding device to a main body is fixed to the main body with a volt | bolt, The said coating | coated part Therefore, the same thing as the three-phase short-circuit grounding device of FIG. 12 can be obtained at a very low cost. In addition, because the hanger bar is also fixed to the plate with bolts, and because the plate itself is also fixed to the short-circuit grounding device body with bolts, the three-phase high-voltage distribution line to which the three-phase short-circuit grounding device is attached and the vicinity Depending on the situation, it is easy to replace the hanger bar with a different shape or replace the plate itself.

  In the invention of claim 2, since the hanger bar protrudes horizontally from one side edge or from one side edge of the plate, the hanger bar protrudes from both side edges. It is suitable for the case where the three-phase high-voltage distribution lines are arranged vertically.

  In the invention of claim 3, the hanger bar protrudes from the upper edge or the lower edge of the plate into a substantially key shape or a substantially F shape so that the outer end portion of the hanger bar is substantially horizontal. Suitable when three-phase high-voltage distribution lines are arranged vertically.

  Further, in the invention of claim 4, it is manufactured simply by fixing a bar-shaped hanger bar with a metal fitting or a wire to the ends of the two short-circuiting grounding bodies with the ends of the two short-circuiting wires fixed. The number of members is small, and the manufacturing cost is low. Moreover, this configuration can be assembled at the ground work site. Therefore, it is extremely versatile.

  Further, in the invention of claim 5, since the hanger bar protrudes horizontally from either side edge of the short-circuit line or from one side edge, the hanger bar protrudes from both side edges. It is suitable when arranged horizontally, and when it protrudes in steps from both sides, it is suitable when three-phase high-voltage distribution lines are arranged vertically.

  In the invention of claim 6, the hanger bar protrudes from the upper part or the lower part of the short-circuit line into a substantially key shape or a substantially F shape so that the outer end portion of the hanger bar is substantially horizontal. Suitable when the phase high-voltage distribution lines are arranged vertically.

  Further, in the invention of claim 7, according to the situation of the site, the plate or the hanger bar having a plurality of types of hanger bars having different front shapes is selected and attached to the short-circuit grounding device main body, and the three-phase Because it is a method of hanging the short-circuit grounding device body that has two short-circuiting grounding device bodies attached to one of the high-voltage distribution lines, when a tree or the like is approaching one of the three-phase high-voltage distribution lines In accordance with the situation of the site and the arrangement of the high-voltage distribution line, select the protruding shape of the hanger bar protruding from the plate and attach the plate to the main body of the grounding grounding device, or attach the protruding hanger bar to the plate, A short-circuit grounding device with two short-circuiting grounding devices attached can be attached to one high-voltage distribution line, and then the other two short-circuiting grounding devices can be attached to two nearby high-voltage distribution lines. Kill.

  Therefore, the installation distance of each three-phase short-circuit grounding device main body and the operation | movement with little or easy operation | movement are attained, and a grounding operation | work can be performed safely and rapidly.

It is a side view of the three-phase short-circuit grounding device of Embodiment 1 of this invention. It is a top view of the three-phase short-circuit grounding device of Embodiment 1 of this invention. It is a rear view of the three-phase short-circuit grounding device of Embodiment 1 of this invention. It is the rear view which removed the two short circuit grounding device main bodies of the three-phase short circuit grounding device of Embodiment 1 of this invention. (A), (B), and (C) are schematic configuration diagrams of three examples of Embodiment 1 of the present invention. (A) The figure-(e) figure are the schematic which showed the example of the block diagram of the hanger bar of Embodiment 1 of this invention, respectively. (F) The figure and (g) figure are the schematic which showed the example of the block diagram of the hanger bar of Embodiment 1 of this invention, respectively. FIGS. 4A and 4B are explanatory diagrams showing the usage state of Embodiment 1 of the present invention. It is a perspective view of the three-phase short-circuit grounding device of Embodiment 2 of this invention. It is a rear view of the three-phase short-circuit grounding device of Embodiment 2 of this invention. It is a principal part side view of the three-phase short-circuit grounding device of Embodiment 2 of this invention. It is a figure which shows the three-phase short circuit grounding device provided with the conventional hanger bar, (a) A figure is a rear view, (b) A figure is a side view.

(Embodiment 1)
Hereinafter, a three-phase short-circuit grounding device A according to Embodiment 1 of the present invention will be described with reference to FIGS.

  The screw rod 4a attached to the upper end of the operation rod 4 is screwed into the base 3 of the short-circuit grounding device main body 1 having the hook-shaped portion 2 formed at the upper end, and the operation rod 4 is rotated to turn the top of the screw rod 4a. The high voltage distribution line 6 (see FIG. 1) is clamped and tightened between the wire holding metal fitting 5 facing the hook-shaped part 2 and the hook-shaped part 2, and is fastened to the high-voltage distribution line 6. A short-circuit grounding device main body 1 is provided, and three short-circuit grounding device main bodies 1 having this configuration are provided.

  Of the three short-circuit grounding device bodies 1, one short-circuit grounding device main body 1a is fixed to the ends of the two short-circuiting wires 7 and 7, and the other short-circuiting wire 7 is connected to the other end. One end of the ground wire 8 is connected to the short-circuit grounding device main body 1a fixed to each of the two short-circuit grounding device main bodies 1 and the two short-circuiting wires 7 and 7 are connected, and the other end of the grounding wire 8 is connected to the ground connector 16 (see FIG. 5) is connected.

  And the core wire 7a which peeled the coating | coated part of each front-end | tip of the said 2 short circuit wire 7 is being fixed to the pressing piece 9. FIG. This holding piece 9 has bolts 9a inserted into holes drilled on both sides, and the tip of the bolt 9a is screwed into a screw hole drilled in a plate body portion 2a provided integrally with the back surface of the bowl-shaped portion 2. ing.

  Further, the covering portion 7b of the two short-circuit wires 7 is pressed by the covering pressing piece 10, covered with a substantially quadrangular plate 11 from above, and each bolt 12 passed through the two holes of the plate is covered with a cylinder. Each of the holes provided in the covering pressing piece 10 is covered with a spacer 13 and is screwed into the screw hole of the plate body portion 2a.

  In addition, a hanger bar 14 is provided at the lower part of the outer surface of the plate 11 so that the tip ends protrude from both sides of the plate 11. The hanger bar 14 is fixed to the plate 11 by screwing the tips of the bolts 15 through the two holes into screw holes formed in the plate 11.

  Further, the hook-like portions 2 of the other two short-circuit grounding device main bodies 1 to which the other ends of the respective short-circuit wires 7 are connected can be hooked on both sides of the hanger bar 14.

  FIG. 5 shows a schematic configuration diagram of three examples of the three-phase short-circuit grounding device A, and FIG. 5A shows the example of FIGS. 1 to 4, and two short-circuit wires 7 and a ground wire 8 are connected. A plate 11 having a hanger bar 14 is provided on the short-circuit grounding device main body 1a. Moreover, (B) figure and (C) figure each provide the plate 11 which has the hanger bar 14 in the short-circuit grounding device main body 1 which connected only one short-circuit wire 7. FIG. Thus, in this invention, the plate 11 having the hanger bar 14 is attached to any one of the three-phase short-circuit grounding device main bodies 1.

  Next, the shape of the hanger bar 14 attached to the plate 11 with bolts 15 is shown in FIGS. However, the shape of the hanger bar 14 is not limited to these.

  The hanger bar 14 shown in FIG. 6A is the same as that shown in FIGS. (B) The hanger bar 14 in the figure protrudes horizontally from the both side surfaces of the plate 11. (C) The figure protrudes from the upper and lower edges of the plate 11 into a key shape, and both ends are horizontal. (D) In the figure, the hanger bar 14 is U-shaped and has two horizontal portions protruding from the plate 11. (E) The figure vertically protrudes downward from the plate 11, and has horizontal protrusions on the left and right like branches.

  In FIG. 7 (f), the hanger bar 14 is of a substantially inverted F technique type, and the horizontal portion protrudes to the side of the plate 11 and the lower side of the plate 11. (G) The figure is the top view which looked at the plate 11, and the hanger bar 14 protrudes from the both sides of the plate 11 in the front and back diagonal direction.

  As described above, there are various shapes of the hanger bar 14 to be attached to the plate 11 with the bolts 15, and the plate 11 to which a plurality of types of hanger bars 14 are attached in advance is prepared. The plate 11 having the hanger bar 14 having a different shape can be easily selected and attached to the short-circuit grounding device main body 1 of the three-phase short-circuit grounding device A depending on the surrounding circumstances.

  Alternatively, a plate 11 is attached in advance to one of the short-circuit grounding devices 1, and hanger bars 14 having various shapes are selected and attached to the plate 11 with bolts 15 in accordance with the situation in the field. I can do it.

  Moreover, in this invention, the plate 11 which has the hanger bar 14 can be provided in the arbitrary short-circuit grounding device main bodies 1 or 1a of the three short-circuit grounding device main bodies 1 of the three-phase short-circuit grounding devices A.

  As shown in FIG. 8 (A), when the three-phase high-voltage distribution lines 6 are arranged horizontally, a deformed U-shaped hanger bar is connected to the short-circuit grounding device body 1 to which one short-circuit wire 7 is connected. 14 is attached, and other short-circuit grounding device bodies 1 and 1 are respectively hung on the upper and lower horizontal parts, and the three-phase short-circuiting grounding device A in this state is locked to the extreme high-voltage distribution line 6; Thereafter, the upper short-circuit grounding device main body 1 can be placed on the central high-voltage distribution line 6, and the lower short-circuit grounding device main body 1 can be placed on the opposite high-voltage distribution line 6.

  According to this, when an aerial work vehicle can only enter the lower side of the three-phase high-voltage distribution line, the three-phase short-circuit grounding device A is hung on the front high-voltage distribution line, and the other two The short-circuit grounding device main body 1 is supported by the tip of the insulating rod and can be hooked in order on the two high-voltage distribution lines 6 in the back, improving workability.

  Further, as shown in FIG. 8B, when the three-phase high-voltage distribution lines 6 are vertically arranged, the short-circuit grounding device main body 1a to which the two short-circuit wires 7 and 7 are connected is crank-type. The plate 11 having the hanger bar 14 is attached, and the other short-circuit grounding device main bodies 1 and 1 are respectively hung on the upper and lower horizontal portions, and the short-circuit grounding device main body 1a of the three-phase short-circuit grounding device A in this state is placed on the top. Lock to the high voltage distribution line 6, and then connect the upper short-circuit grounding device body 1 to the second height high-voltage distribution line 6 and the lower short-circuit grounding device body 1 to the third height high-voltage distribution line 6. You can stop ranking.

  According to this, when the short-circuit grounding device main body 1a is first hooked to the uppermost high-voltage distribution line 6, the other two short-circuit grounding device main bodies 1 and 1 are supported at the tip of the insulating rod, Therefore, it is sufficient to perform the operation only for the high-voltage distribution line 6 and the lowermost high-voltage distribution line 6. Conversely, the short-circuit grounding device main body 1a is supported by the lowermost high-voltage distribution line 6, and the other two short-circuit grounding device main bodies 1 and 1 are supported by the tips of the insulating rods, respectively, and the uppermost and middle portions. It can also be hooked on the high-voltage distribution line 6 having a height of.

(Embodiment 2)
9 to 11 show a second embodiment of the present invention. In the second embodiment, the central portion of the bar-shaped hanger bar 18 is brought into contact with the two short-circuiting ground bodies 1 and 7 of the short-circuit grounding device main body 1a to which the ends of the two short-circuiting wires 7 and 7 are fixed. The tip of both sides of the U-shaped metal fitting 19 that covers the two outer circumferences of the hanger bar 18 protrudes from both sides of the two short-circuit wires 7 and 7 to the back side, and is inserted into the holes of the holding pieces 20 and pressed. A nut 21 is screwed onto a thread portion at the tip of a U-shaped metal fitting protruding from the surface of the piece 20, and the hanger bar 18 is supported by the two short-circuit wires 7 and 7. Then, the other two short-circuit grounding device bodies 1 and 1 can be hooked on both sides of the hanger bar 18.

  In the second embodiment, the U-shaped bracket 19 and the holding piece 20 are used to support the hanger bar 18 on the two short-circuit wires 7 and 7. However, other appropriate brackets can be fixed, It can also be fixed with a wire. As a result, the hanger bar 18 can be attached to the short-circuit grounding device main body 1 to which the two short-circuiting wires 7 and 7 of the three-phase short-circuiting ground device are connected, and the other two short-circuit grounding device main bodies 1 can be hooked.

  In the second embodiment, the center portion of the hanger bar 18 is fixed to the two short-circuit wires 7 and 7, and the hanger bar 18 is protruded from both sides of the short-circuit wires 7 and 7. Without limitation, when the hanger bar 18 protrudes horizontally from both sides or one side of the two short-circuit lines 7, 7, or from the upper or lower part of the end of the two short-circuit lines 7, 7, For example, when the outer end portion of the hanger bar 18 protrudes in a substantially key shape or a substantially F shape so as to be substantially horizontal, various forms can be adopted.

  As described above, in the second embodiment, the hanger bar can be easily attached, and the manufacturing cost can be extremely reduced as compared with the conventional three-phase short-circuit grounding device T of FIG.

A Three-phase short-circuit grounding device T Three-phase short-circuit grounding device 1 Short-circuit grounding device main body 1a Short-circuit grounding device main body 2 Cage-shaped portion 2a Plate body 3 Base portion 4 Operation rod 4a Screw rod 5 Wire retainer 6 High-voltage distribution line 7 Short-circuit wire
7a Core wire 7b Cover 8 Ground wire 9 Holding piece
9a Bolt 10 Cover presser piece 11 Plate 12 Bolt 13 Spacer 14 Hanger bar 15 Bolt 16 Ground connector 18 Hanger bar 19 U-shaped bracket 20 Presser piece 21 Nut

Claims (7)

An electric wire press fitting attached to the top of the screw rod by screwing a screw rod attached to the upper end of the operation rod into the base of the short-circuit grounding device main body formed with a hook-like portion at the upper end, and rotating the operation rod; Prepare three short-circuit grounding device bodies to be hooked to the wire by clamping and tightening the wire between the opposite hook-shaped portion and connect these short-circuit grounding device bodies with a short-circuit wire. In a three-phase short-circuit grounding device that has a ground connector at the tip of the ground wire connected to one of these short-circuit grounding device bodies,
A plate for fixing the end of the short-circuit wire of the one short-circuit grounding device main body by screwing the short-circuit grounding device main body with a plurality of bolts;
A three-phase short-circuit grounding device characterized in that a hanger bar is fixed to the outer surface of the plate with a bolt, and the other two short-circuit grounding device bodies can be hooked on the hanger bar protruding from the outer edge of the plate.   The three-phase short-circuit grounding device according to claim 1, wherein the hanger bar protrudes substantially horizontally from both side edges or one side edge of the plate.   The said hanger bar protruded from the upper edge or the lower edge of the said plate to the substantially key shape or the substantially F type | mold so that the outer end part of a hanger bar might become substantially horizontal. Three-phase short-circuit grounding device. An electric wire press fitting attached to the top of the screw rod by screwing a screw rod attached to the upper end of the operation rod into the base of the short-circuit grounding device main body formed with a hook-like portion at the upper end, and rotating the operation rod; Prepare three short-circuit grounding device bodies to be hooked to the wire by clamping and tightening the wire between the opposite hook-shaped portion and connect these short-circuit grounding device bodies with a short-circuit wire. In a three-phase short-circuit grounding device that has a ground connector at the tip of the ground wire connected to one of these short-circuit grounding device bodies,
A bar-shaped hanger bar is fixed to the ends of the two short-circuiting wires of the short-circuiting grounding device main body, in which the ends of the two short-circuiting wires connecting the three short-circuiting grounding devices are connected to each other with a metal fitting or a wire. ,
A three-phase short-circuit grounding device, characterized in that a hanger bar protrudes from the two short-circuit wires, and the other two short-circuit grounding device bodies can be hooked on the protruding portion of the hanger bar.   The three-phase short-circuit grounding device according to claim 4, wherein the hanger bar fixed to the two short-circuit wires protrudes horizontally from both sides or one side of the two short-circuit wires.   The hanger bar fixed to the two short-circuit wires protrudes from the upper or lower portion of the two short-circuit wire ends into a substantially key shape or a substantially F-shape so that the outer end portion of the hanger bar is substantially horizontal. The three-phase short-circuit grounding device according to claim 4, wherein: Using the three-phase short-circuit grounding device according to any one of claims 1 to 3, the plate or the hanger bar having a plurality of types of hanger bars having different shapes is selected and short-circuited according to the situation in the field. The three-phase high-voltage distribution is characterized in that the three-phase high-voltage distribution is characterized in that it is attached to the grounding device main body, and the short-circuiting grounding device main body having two short-circuiting grounding device bodies hung on the hanger bar. Electrical grounding attachment / detachment method.