JP2004153876A - Conductive rod for ground clip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely perform maintenance work in a high-voltage AC conductive path and work such as apparatus replacement, etc. by preventing the fall of a ground clip mounted to a connector terminal while enabling the mounting and removal of the ground clip to be performed easily when securing a ground by mounting the ground clip in the electric path of a high-voltage switch. <P>SOLUTION: A conductive rod 10 for ground clip C is fixed to the connector terminal 6 of the high-voltage switch 1, and a power cable l1 is connected to the conductive rod l0. At one end of the conductive rod 10, the first fastening seat 12 to be fastened to the connector terminal 6 and the second fastening seat 14 to fasten a power cable 11 are made. A holding part 16 is made between both the first and second fastening seats 12 and 14. The holding par 16 is arranged so that the earth clip C can be mounted to and removed from the holding part 16 from the side right opposite to the conductive rod 10 by being twisted by 90° from the first fastening rod 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive rod to which a ground clip for grounding a high-voltage AC circuit is mounted when maintenance work or equipment replacement is performed on the high-voltage AC circuit or the like.
[0002]
[Prior art]
With respect to the present invention, it is known to torsionally deform a part of a strip-shaped branch bus (see Patent Document 1). When maintenance work or equipment replacement is performed on the high-voltage AC circuit, the work is performed with the high-voltage AC circuit grounded to ensure the safety of workers. For example, in the case of a high voltage switch such as a load switch with a current limiting fuse of a striker trip type, as shown in FIG. 5, a ground clip 31 is attached to the connection terminal 30 on the power supply side of the high voltage switch. The ground is secured. A power line 32 is directly connected to the connection terminal 30 with a bolt 33. The ground clip 31 used there is based on a ground clip having a general structure used in a welding machine or the like, and a pair of holding jaws 34 is provided with a holding plate 35 protruding from the holding jaw 34 to one side. It had a fixed structure.
[0003]
[Patent Document 1]
Japanese Patent No. 1013797 for Design Registration
[Problems to be solved by the invention]
In many cases, a plurality of sets of high-voltage switches are arranged side by side. For this reason, there is no other way than to attach the ground clip to the connection terminal, using the space adjacent to the high-voltage switch, but the connection terminal is located at the deepest part of the high-voltage switch and Due to the small space adjacent to the ground clip, it sometimes took time to mount the ground clip. In many cases, as shown in FIG. 5, the ground clip 31 is attached to the connection terminal 30 from a lateral direction in a posture substantially parallel to the drawing direction of the power line 32. However, since the power line 32 on the power supply side is directly fastened to the connection terminal 30 with bolts 33, these members including the bolts 33 are simultaneously held by a pair of holding plates 34 projecting laterally from the holding jaws 34. It is difficult to obtain a stable holding state. For example, when the ground clip 36 trips, the ground clip 31 is easily detached from the connection terminal 30. Had a problem.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide an earth clip which can easily attach and detach the earth clip, and can stably maintain the mounting state of the earth clip to safely perform maintenance work and equipment replacement work on a high-voltage AC power circuit. To provide a conductive rod.
[0006]
[Means for Solving the Problems]
The conductive bar for the earth clip according to the present invention is connected to the connection terminal 6 of the high-voltage AC electric circuit. At one end of the conductive rod 10, a first fastening seat 12 and a first bolt insertion hole 13 to be fastened to the connection terminal 6 with a first bolt 18 are formed, and at the other end of the conductive rod 10, a power line 11 is formed. A second fastening seat 14 for fastening with the two bolts 20 and a second bolt insertion hole 15 are formed. A holding portion 16 for the ground clip C is formed between the first and second fastening seats 12 and 14. Thus, the ground clip C can be attached to and detached from the holding portion 16 from the side directly facing the conductive rod 10.
[0007]
The conductive rod 10 can be formed using a strip-shaped copper plate as a raw material, and twists and deforms the strip-shaped copper plate between the first fastening seat 12 and the holding portion 16 as shown in FIG. And the holding portion 16 and the second fastening seat 14 are formed substantially orthogonally.
[0008]
As shown in FIGS. 4B and 4C, the holding portion 16 and the second fastening seat 14 are formed so as to be inclined to the left or right with respect to the first fastening seat 12.
[0009]
As shown in FIG. 4D, the conductive rod 10 can be formed by using a copper rod as a raw material. First and second fastening seats 12 and 14 are formed at both ends of the copper rod, and the conductive rod 10 is formed in the middle of the copper rod. The holding portion 16 is formed.
[0010]
Operation and Effect of the Invention
In the present invention, the power line 11 is connected and fixed to the connection terminal 6 of the high-voltage AC circuit via the conductive rod 10 having first and second fastening seats 12 and 14 at both ends. The ground clip C can be attached to the holding portion 16 provided between the seats 12 and 14 from the side directly facing the conductive rod 10. Therefore, according to the conductive rod 10 of the present invention, the earth clip C can be attached to and detached from the holding portion 16 at a position distant from the connection terminal 6 and in a state where it can be easily operated facing the conductive rod 10. The earth clip C can be easily attached and detached without being disturbed by the peripheral structure of the vehicle. In addition, since the ground clip is attached to the holding portion 16 provided in the middle of the conductive rod 10, the ground clip C can be securely held on the conductive rod 10 more stably than the conventional clip mounted state. Since it can be attached, even when a tensile force acts on the ground clip C via the ground cord 27, for example, the ground clip C is prevented from dropping off from the conductive rod 10 and maintenance in the high-voltage AC circuit is performed. Work such as work and equipment replacement can be performed safely.
[0011]
The conductive rod 10 is formed using a strip-shaped copper plate as a raw material, and the copper plate is twisted between the first fastening seat 12 and the sandwiching portion 16 to thereby deform the first fastening seat 12, the sandwiching portion 16 and the second fastening seat 16. When the conductive rod 10 is fixed to the connection terminal 6, the peripheral side surface of the holding portion 16 that matches the thickness of the copper plate can be directly opposed to the worker when the conductive rod 10 is fixed to the connection terminal 6. The earth clip C can be easily attached to and detached from the holding section 16 without the need to greatly expand the jaw 25, and the earth clip C is held in a more stable state by the smaller holding thickness by the holding jaw 25. It can be pinched and mounted. There is no need to prepare a specially-designed ground clip provided with a conventional holding plate, which is advantageous in that a normal-specific ground clip C can be used.
[0012]
According to the conductive rod 10 in which the holding portion 16 and the second fastening seat 14 are inclined leftward or rightward with respect to the first fastening seat 12, the position and the orientation of the second fastening seat 14 can be changed. The position of the power line 11 can be changed according to the peripheral structure of the connection terminal 6 or the direction in which the power line 11 is drawn out, so that the power line 11 can be suitably changed. There is also an advantage that the attaching / detaching operation of the ground clip C can be performed in a more comfortable posture.
[0013]
According to the conductive rod 10 in which the first and second fastening seats 12 and 14 are formed at both ends of the copper rod and the sandwiching part 16 is formed in the middle thereof, the conductive rod 10 is compared with the conductive rod 10 made of a strip-shaped copper plate. Thus, the surface area of the conductive rod 10 can be reduced, and the total length of the angular edge portion can be minimized, so that there is an advantage that the edge distance for insulation can be reduced. The fastening seats 12 and 14 and the holding portion 16 can be formed by pressing or cutting.
[0014]
【Example】
(Embodiment 1) FIGS. 1 to 3 show an embodiment of a conductive rod according to the present invention. FIG. 2 shows a high-voltage switch to which a conductive rod is applied. The high-voltage switch comprises a striker trip type load switch with a current-limiting fuse. A current-limiting fuse 2 is provided in series with the switch 1, and the switch 1 is tilted back and forth by an operation handle 3 and a manual release lever 4. Operate to open and close high-voltage AC circuits. When a short-circuit current flows in the high-voltage AC circuit, the current-limiting fuse 2 blows and cuts off the circuit at a high speed. At the same time, the striker provided at the bottom of the current-limiting fuse 2 projects and operates the trip lever, thereby switching the switch 1. Switch to open circuit. In FIG. 2, reference numeral 5 denotes a connection terminal on the load side, 6 denotes a connection terminal on the power supply side, 7 denotes an arc-extinguishing chamber for interrupting an arc when the electric circuit is opened, and 8 denotes a partition separating the adjacently arranged switches 1.
[0015]
A conductive rod 10 for an earth clip according to the present invention is mounted on the connection terminal 6, and a power line 11 on a power supply side is connected to an upper end thereof. As shown in FIGS. 1 and 3, the conductive rod 10 is made of a strip-shaped copper plate, and has a first fastening seat 12 and a first bolt insertion hole 13 at its lower end, and a second fastening seat at its upper end. A seat 14 and a second bolt insertion hole 15 are formed, and a holding portion 16 for an earth clip C is formed between the first and second fastening seats 12 and 14. The plate surface between the first fastening seat 12 and the holding part 16 is twisted and deformed by 90 degrees, so that the holding part 16 and the second fastening seat 14 and the first fastening seat 12 are orthogonal to each other. Intersect.
[0016]
In use, the first fastening seat 12 is fastened and fixed to the connection terminal 6 with the first bolt 18 and the first nut 19 as shown in FIG. Further, the power line is fastened and fixed to the second fastening seat 14 with the second bolt 20 and the second nut 21. The connection terminal 6 faces the front side of the switch 1 and faces the worker standing in front of the switch 1. Therefore, when the conductive rod 10 is fastened to the connection terminal 6, the wide plate surfaces of the sandwiching portion 16 and the second fastening portion 14 face the side surfaces, and the peripheral side surfaces corresponding to the plate thickness face the front surface of the switch 1. The ground clip C is attached to the holding portion 16 in this state.
[0017]
As shown in FIG. 1, the ground clip C includes a pair of holding arms 23, a shaft 24 that pivotally supports the two holding arms 23, and a pair of holding jaws 25 in a direction in which the pair of holding jaws 25 approach each other. Is constituted by a spring (not shown) or the like for oscillating urging, and an earth cord 27 is led out from a contact tooth 26 fixed to the holding jaw 25. As described above, when the ground clip C is attached to the conductive rod 10 extending upward from the connection terminal 6, the ground clip C is attached to and detached from the holding portion 16 at a position distant from the connection terminal 6 and directly facing the conductive rod 10. Therefore, the ground clip C can be easily attached and detached without being hindered by the peripheral structure of the connection terminal 6 or the partition 8. Further, in a state where the ground clip C is mounted on the holding portion 16, the pair of contact teeth 26 hold the wide plate surface of the holding portion 16 in the thickness direction. It can be attached, and for example, even if it accidentally trips on the ground cord 27, it is possible to prevent the ground clip C from dropping from the holding portion 16 well.
[0018]
FIGS. 4A to 4D show modified examples of the conductive rod 10. In FIG. 4A, the first fastening seat 12 and the holding portion 16 are twisted and deformed by 90 degrees, and the gap between the holding portion 16 and the second fastening seat 14 are twisted and deformed by 90 degrees. The point that 12 and 14 are formed in parallel is different from the previous embodiment. In FIG. 4B, similarly to the conductive rod 10 of FIG. 1, the plate surface between the first fastening seat 12 and the holding portion 16 is twisted and deformed by 90 degrees, and the plate surface on the upper end side is held by the holding portion 16. The second fastening portion 14 was bent laterally at a constant angle. In this embodiment, the second fastening portion 14 is bent 90 degrees with respect to the plate surface on the side of the holding portion 16.
[0019]
In FIG. 4C, similarly to the conductive rod 10 of FIG. 1, the plate surface between the first fastening seat 12 and the sandwiching portion 16 is twisted and deformed by 90 degrees, and then the sandwiching portion 16 and the second fastening seat 14 are deformed. The side plate surface was bent to a certain angle to the side.
[0020]
In FIG. 4D, the conductive rod 10 is formed using a copper rod having a circular cross section as a raw material. Specifically, both ends of the copper bar were crushed flat in the front-rear direction and deformed to form the first and second fastening seats 12 and 14 in parallel. Further, the middle part of the copper rod was flattened and deformed in the left-right direction to form the holding part 16 in a direction orthogonal to the two fastening parts 12 and 14. If necessary, the holding portion 16 can be formed in a triangular cross section or a trapezoidal cross section to prevent the earth clip C attached to the holding portion 16 from being pulled out. As described above, the two fastening seats 12 and 14 and the holding portion 16 are advantageously formed by press working in terms of cost, but can be formed by cutting if necessary.
[0021]
In addition to the above, in the conductive rod 10 described with reference to FIGS. 1 to 4C, the twist deformation direction of the first fastening seat 12 and the holding portion 16 may be either right-handed or left-handed. The conductive rod 10 can be formed of a metal other than copper. In the conductive rod 10 described with reference to FIG. 4D, it is not necessary to crush and deform the holding portion 16, and an unprocessed rod portion can be used as the holding portion 16. By forming a group of anti-slip projections on the peripheral surface of the holding portion 16, the contact teeth 26 can be effectively prevented from falling off. The conductive rod 10 of the present invention can be applied to a connection terminal of a high-voltage AC circuit, such as a connection terminal of a transformer, in addition to the high-voltage switch.
[Brief description of the drawings]
FIG. 1 is a side view of a main part of a high-voltage switch.
FIG. 2 is a perspective view of a high-voltage switch.
FIG. 3 is a front view of a conductive rod and its peripheral structure.
FIG. 4 is a front view showing a modified example of the conductive rod.
FIG. 5 is a front view of a conventional high-voltage switch showing a ground state.
[Explanation of symbols]
6 Connection terminal 10 Conductive rod 11 Power line 12 First fastening seat 13 First bolt insertion hole 14 Second fastening seat 15 Second bolt insertion hole 16 Clamping portion 18 First bolt 20 Second bolt C Ground clip

Claims (4)

A conductive bar for an earth clip connected to the connection terminal 6 of the high-voltage AC circuit,
At one end of the conductive rod 10, a first fastening seat 12 and a first bolt insertion hole 13 to be fastened to the connection terminal 6 with a first bolt 18 are formed, and at the other end of the conductive rod 10, a power line 11 is formed. A second fastening seat 14 for fastening with the two bolts 20 and a second bolt insertion hole 15 are formed,
A clamping portion 16 for the ground clip C is formed between the first and second fastening seats 12 and 14,
A conductive clip for a ground clip, wherein a ground clip C can be attached to and detached from the holding portion 16 from a side facing the conductive rod 10. The conductive rod 10 is formed using a strip-shaped copper plate as a raw material,
A belt-shaped copper plate is twisted and deformed between the first fastening seat 12 and the sandwiching portion 16 so that the first fastening seat 12 and the sandwiching portion 16 and the second fastening seat 14 are formed substantially orthogonally. Item 2. A conductive rod for an earth clip according to Item 1. The conductive rod for an earth clip according to claim 2, wherein the holding portion (16) and the second fastening seat (14) are formed so as to be inclined leftward or rightward with respect to the first fastening seat (12). The conductive rod 10 is formed using a copper rod as a material,
First and second both fastening seats 12 and 14 are formed at both ends of the copper rod,
2. The conductive bar for an earth clip according to claim 1, wherein the holding portion is formed in a middle portion of the copper bar.

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