JP7095469B2 - Ground short circuit device - Google Patents

Description

The present invention relates to a ground short circuit device. In particular, it is a grounding short-circuit device used to release the induced current induced in the transmission line erected on the steel tower to the ground side, and is a ground hook that can be electrically connected to the transmission line, and the ground extending from the hook part of the ground hook. The present invention relates to the structure of a ground short-circuit device composed of a wire and a ground terminal connected to the other end of the ground wire.

When inspecting and performing electrical work on electric lines such as transmission lines, the work is carried out with the construction site in a power outage state for safety. Since such inspection and electrical work give the highest priority to ensuring the safety of the worker, in order to protect the worker from the induced current induced in the electric line, the transmission line is grounded by using a ground hook. There is.

For example, a ground short-circuit device consisting of a ground hook that can be electrically connected to a power transmission line, a ground wire extending from the hook portion of the ground hook, and a ground terminal connected to the other end of the ground wire is known. (For example, see Patent Document 1).

By connecting the hook portion of the earth hook to the transmission line and grounding the ground terminal to the ground side via the earth wire, the operator can be protected from the induced current induced in the transmission line.

Japanese Unexamined Patent Publication No. 2011-66952

FIG. 4 is a perspective view showing the configuration of a grounding short-circuit device according to the prior art. FIG. 5 is an enlarged side view of the ground terminal provided in the ground short-circuit device according to the prior art. Note that FIGS. 4 and 5 of the present application correspond to FIGS. 10 and 11 of Patent Document 1.

Referring to FIG. 4, the conventional ground short-circuit device 100 includes a ground hook 8, a long ground wire 8w, and a ground terminal 9. The ground hook 8 can sandwich a power transmission line (not shown) by a hook portion 82 arranged on the tip end side thereof, and the hook portion 82 can be electrically connected to a power transmission line (not shown).

Referring to FIG. 4, one end of the ground wire 8w is electrically connected to the hook portion 82. Further, the ground wire 8w has other ends electrically connected to the ground terminal 9 (see FIG. 5). The ground terminal 9 can clamp the angle member Ma constituting the steel tower. The ground terminal 9 can be electrically connected to the steel tower.

With reference to FIG. 4, the ground terminal 9 is connected to the angle member Ma, and the transmission line (not shown) is sandwiched by the ground hook 8, so that the transmission line (not shown) is passed through the ground wire 8w. Can be grounded to the ground side (steel tower). The other end side of the ground wire 8w is wound around the angle member Ma so as not to fall off from the angle member Ma.

Referring to FIG. 5, the ground terminal 9 includes a conductive block-shaped clamp body 91 and a feed screw 92. The clamp main body 91 has a first arm 91a and a second arm 91b arranged so as to face each other. Further, the clamp main body 91 has a base end arm 91c protruding on the opposite side to the first arm 91a and the second arm 91b.

Referring to FIG. 5, a crimp terminal 8t is crimped to the other end of the ground wire 8w. The crimp terminal 8t is fixed to the base end arm 91c by using a bolt member 911. As a result, the ground wire 8w and the clamp body 91 are electrically connected.

Referring to FIG. 5, the lead screw 92 has a shaft portion screwed with a female screw (not shown) provided on the first arm 91a. The lead screw 92 connects a disk-shaped pressing head 92r to the tip end portion. The pressing head 92r is rotatably held at the tip of the feed screw 92. Further, the feed screw 92 has a handle 92h at the base end portion.

With reference to FIG. 5, an angle member Ma is introduced between the first arm 91a and the second arm 91b, and the handle 92h is operated to rotate the feed screw 92 in one direction to push the pressing head 92r. It can be screwed toward the second arm 91b. Then, by sandwiching the angle member Ma between the pressing head 92r and the second arm 91b, the angle member Ma and the ground terminal 9 can be electrically connected.

On the other hand, referring to FIG. 5, the pressing head 92r can be retracted from the second arm 91b by operating the handle 92h to rotate the feed screw 92 in the other direction. Then, the ground terminal 9 can be released from the angle member Ma. In general, the grounding terminal for securely fixing the ground wire 8w to the angle member Ma, which is a steel tower member, is often a clamp type in which the angle member Ma is sandwiched between the feed screw 92 and the second arm 91b.

When the transmission line is grounded to the steel tower by using the grounding short-circuiting device 100 configured as described above with reference to FIG. 4 or FIG. 5, (1) first, the grounding terminal 9 is clamped to the angle member Ma. .. (2) Next, the other end side of the ground wire 8w is wound around the angle member Ma to prevent the ground hook 8 from falling off. (3) Next, the transmission line is sandwiched between the hook portions 82 by using the earth hook 8.

On the other hand, when the grounding is released from the tower, (4) first, the hook portion 82 is removed from the transmission line. (5) Next, the ground terminal 9 is removed from the angle member Ma.

However, if the above procedure is mistaken and the ground terminal 9 is removed from the angle member Ma before the hook portion 82 is removed from the transmission line, there is a concern that an induced electric shock may occur. On the other hand, if the hook portion 82 is attached to the transmission line before the ground terminal 9 is attached to the angle member Ma, there is a concern that an induced electric shock may occur. The name is repeated for each work procedure so as not to make a mistake in the work procedure, but there is a limit to relying on the attention of the worker or the supervisor.

There is a demand for a grounding short-circuit device that reliably prevents mistakes in the procedure for grounding a transmission line to a steel tower or the like without depending on the attention of a worker or a supervisor. The above can be said to be the subject of the present invention.

The present invention has been made in view of such a problem, and an error in the procedure for grounding a current-carrying body such as a power transmission line to a grounding member such as a steel tower without depending on the attention of an operator or a supervisor is made. It is an object of the present invention to provide a grounding short-circuit device for reliable prevention.

The present inventor constitutes a grounding short-circuit device with a grounding terminal to which a grounding member can be energized and detached, a ground hook having a hook portion to which an energizing body can be detached, and a ground wire electrically connected to the grounding terminal and the hook portion. However, by mooring the rotary tool that can be detachably fitted to the head of the feed screw provided on the ground terminal to the ground hook, the rotary tool is required to attach and detach the ground terminal to the ground member. We thought that it would be possible to reliably prevent mistakes in the mounting procedure for attaching the hook to the current-carrying body first, and based on this, we invented the following new grounding short-circuit device.

(1) The grounding short-circuit device according to the present invention has a grounding terminal to which a grounding member can be electrically attached and detached, a long insulating operation rod, and a hook which is arranged at the tip of the insulating operation rod and can attach and detach an energizing body. A ground hook having a portion and a long ground wire having one end electrically connected to the hook portion and the other end electrically connected to the ground terminal are provided, and the ground terminal is a set. The first arm and the second arm of the above are arranged to face each other, and the clamp main body and the shaft portion in which the other end of the ground wire is connected to the base end arm protruding to the opposite side of the first arm and the second arm are When screwed with the first arm and the shaft portion is rotated in one direction, the tip portion is screwed toward the second arm, and when the shaft portion is rotated in the other direction, the tip portion is screwed from the second arm. The ground hook has a feed screw whose tip is retracted, and the ground hook has a rotary tool that can be detachably connected to the head of the feed screw, and the rotary tool has the feed screw. The shaft has a hole that can be fitted to the head of the shaft so that it cannot be rotated.

(2) It is preferable that the rotary tool is provided with a butterfly-shaped handle portion.

(3) It is preferable that the head of the feed screw is made of a prism member, and the hole of the rotary tool is made of a square hole into which the prism member can be introduced.

(4) It is preferable that one end of the string is moored between the tip of the insulating operation rod and the base end of the hook.

The grounding short-circuit device according to the present invention has a grounding terminal that allows the grounding member to be energized and detached, an earth hook that has a hook portion that allows the energizing body to be attached and detached, and a grounding wire that electrically connects the grounding terminal and the hook portion. By mooring a rotary tool that constitutes the device and that is detachably fitted to the head of the feed screw provided at the ground terminal to the ground hook, a rotary tool is required to attach / detach the ground terminal to the ground member. Therefore, it is possible to reliably prevent mistakes in the mounting procedure for attaching the ground hook to the energized body first.

It is a side view which shows the structure of the grounding short circuit apparatus by one Embodiment of this invention. It is an enlarged view which shows the structure of the rotary tool provided in the grounding short circuit device by the said embodiment, FIG. 2A is a front view of a rotary tool, and FIG. 2B is a bottom view of a rotary tool. It is an enlarged perspective view of the main part of the rotary tool and the grounding terminal provided in the grounding short circuit device by the said embodiment. It is a perspective view which shows the structure of the grounding short circuit device by the prior art. It is an enlarged side view of the grounding terminal provided in the grounding short circuit device by the prior art.

[Configuration of ground short circuit device]
Next, the configuration of the ground short-circuit device according to the embodiment of the present invention will be described.

In addition, since the components having the same reference numerals as those given in the prior art have the same operation, the description thereof may be omitted below.

(overall structure)
Referring to FIG. 1 or FIG. 3, the ground short-circuit device 10 according to the embodiment of the present invention includes a ground terminal 7, a ground hook 8, and a long ground wire 8w. The grounding terminal 7 can be attached to and detached from a grounding member such as an angle member Ma (see FIG. 4) constituting the steel tower so as to be energized.

Referring to FIG. 1, the ground hook 8 includes a long insulating operation rod 81 and a hook portion 82. The hook portion 82 is arranged at the tip end portion of the insulating operation rod 81. An energizing body such as a power transmission line (not shown) can be attached to and detached from the hook portion 82.

Referring to FIG. 1, one end of the ground wire 8w is electrically connected to the hook portion 82. Further, the other end of the ground wire 8w is electrically connected to the ground terminal 7. Further, the ground terminal 7 can clamp the angle member Ma constituting the steel tower (see FIG. 5). The ground terminal 7 can be electrically connected to the steel tower.

Referring to FIG. 1 or FIG. 3, the ground terminal 7 includes a conductive block-shaped clamp body 71 and a feed screw 72. The clamp main body 71 has a first arm 71a and a second arm 71b arranged so as to face each other. Further, the clamp main body 71 has a base end arm 71c protruding on the opposite side to the first arm 71a and the second arm 71b. The other end of the ground wire 8w is connected to the base end arm 71c.

Referring to FIG. 1 or FIG. 3, the lead screw 72 has a shaft portion 72s screwed with a female screw (not shown) provided on the first arm 71a. The lead screw 92 connects a hexagonal columnar pressing head 72r to the tip end portion. The pressing head 72r is rotatably held at the tip of the feed screw 92.

By rotating the shaft portion 72s in one direction with reference to FIG. 1 or FIG. 3, the pressing head 72r can be screwed toward the second arm 71b. On the other hand, when the shaft portion 72s is rotated in the other direction, the pressing head 72r can be retracted from the second arm 71b.

Referring to FIGS. 1 to 3, the ground hook 8 further includes a rotary tool 1 moored with a short string body 1w. The rotary tool 1 can be detachably connected to the head 72h of the feed screw 72. Further, the rotary tool 1 has a hole portion 11 in the shaft portion 11s that is fitted to the head portion 72h of the feed screw 72 so as to be non-rotatable.

Referring to FIGS. 1 to 3, the grounding short-circuit device 10 according to the embodiment has a grounding terminal 7 to which a grounding member can be energized and attached, an earth hook 8 having a hook portion 82 to which an energizing body can be attached and detached, and a grounding terminal 7. It is composed of a ground wire 8w electrically connected to the hook portion 82.

Referring to FIGS. 1 to 3, in the grounding short-circuiting device 10 according to the embodiment, the rotary tool 1 detachably fitted to the head 72h of the feed screw 72 provided in the grounding terminal 7 is moored to the grounding hook 8. Since the rotary tool 1 is required when the grounding terminal 7 is attached to and detached from the grounding member, it is possible to reliably prevent an error in the mounting procedure for attaching the grounding hook 8 to the energizing body first.

(Structure of earth hook)
Next, the configuration of the earth hook 8 according to the embodiment will be described. Referring to FIG. 1, the hook portion 82 includes a hook portion main body 82b and a hook 82h. The hook 82h is provided with a support shaft 82s at its base end. The support shaft 82s is rotatably connected to the hook 82h with respect to the hook portion main body 82b.

Referring to FIG. 1, the hook 82h is urged with a force toward the hook portion main body 82b. A transmission line (not shown) can be introduced from the outer peripheral direction between the hook 82h and the hook portion main body 82b, and the transmission line (not shown) can be sandwiched from the outer peripheral direction. The hook portion 82 can be electrically connected to a transmission line (not shown).

Referring to FIG. 1, the insulation operation rod 81 is composed of a long pipe member. The hook portion 82 can be operated remotely by grasping the insulation operation rod 81. The insulating operation rod 81 is preferably made of, for example, a synthetic resin pipe having an insulating property formed by molding an epoxy resin or the like.

Referring to FIG. 1, the ground hook 8 according to the embodiment discloses a clip-type ground hook, but the clip can be opened and closed with respect to the hook portion main body by rotating the insulating operation rod around its axis. You can also use the ground hook of.

Referring to FIG. 1, in the earth hook 8 according to the embodiment, it is preferable to moor one end portion of the string body 1w between the tip end portion of the insulating operation rod 81 and the base end portion of the hook portion 82.

(Configuration of ground terminal)
Next, the configuration of the ground terminal 7 according to the embodiment will be described. Referring to FIG. 1, a crimp terminal 8t is crimped to the other end of the ground wire 8w. The crimp terminal 8t is fixed to the base end arm 71c by using a bolt member 711. As a result, the ground wire 8w and the clamp body 71 are electrically connected. Further, the other end of the ground wire 8w is fixed to the base end arm 71c by using the holding metal fitting 712.

Referring to FIG. 1 or FIG. 3, the lead screw 72 has a head 72h made of a quadrangular prism member. On the other hand, the hole portion 11 of the rotary tool 1 is provided with a square hole into which the head portion 72h can be introduced from the bottom portion of the shaft portion 1s. By fitting the hole 11 of the rotary tool 1 into the head 72h of the feed screw 72, the feed screw 72 can be rotated by using the rotary tool 1.

With reference to FIG. 1 or 3, an angle member Ma is introduced between the first arm 71a and the second arm 71b (see FIG. 5), and the rotary tool 1 is operated to move the lead screw 72 in one direction. By rotating, the pressing head 72r can be screwed toward the second arm 71b. Then, by sandwiching the angle member Ma between the pressing head 72r and the second arm 71b, the angle member Ma and the ground terminal 7 can be electrically connected.

On the other hand, referring to FIG. 1 or FIG. 3, the pressing head 72r can be retracted from the second arm 71b by operating the rotary tool 1 to rotate the feed screw 72 in the other direction. Then, the ground terminal 7 can be released from the angle member Ma. The grounding terminal 7 according to the embodiment uses a clamp-type grounding terminal that sandwiches the angle member Ma between the feed screw 72 and the second arm 71b.

Comparing FIGS. 5 and 1, the ground terminal 9 according to the prior art has a handle 92h provided at the base end of the lead screw 92, whereas the ground terminal 7 according to the embodiment can be operated only by the rotary tool 1. There is a difference in that the head 72h is provided at the base end of the feed screw 72.

(Structure of rotary tool)
Next, the configuration of the rotary tool 1 according to the embodiment will be described. Referring to FIG. 2 or FIG. 3, the rotary tool 1 includes a butterfly-shaped handle portion 1h. The handle portion 1h is formed on the upper portion of the shaft portion 1s. Further, the other end of the string body 1w is moored to the handle portion 1h. The rotary tool 1 is preferably made of a hard metal body. The string body 1w can also be made of a flexible wire.

[Action of ground short circuit device]
Next, the operation and effect of the ground short-circuit device 10 according to the embodiment will be described. With reference to FIGS. 1 to 3, when an energizing body such as a transmission line erected on a steel tower is grounded to a grounding member such as a steel tower, first, the angle member Ma constituting the tower (FIG. 4 or 5). See), clamp the ground terminal 7.

With reference to FIGS. 1 to 3, in order to clamp the ground terminal 7 to the angle member Ma, it is necessary to bring the rotary tool 1 moored to the hook portion 82 close to the ground terminal 7 and operate the feed screw 72. Therefore, it is possible to reliably prevent an error in the mounting procedure for first attaching the ground hook 8 to the energizing body.

On the other hand, referring to FIGS. 1 to 3, when the grounding of the energizing body such as the transmission line erected on the steel tower and the grounding member such as the steel tower is released, the clamp between the grounding terminal 7 and the angle member Ma is released. Therefore, it is necessary to bring the rotary tool 1 moored to the hook portion 82 close to the ground terminal 7 and operate the feed screw 72. As a result, it is possible to reliably prevent an error in the mounting procedure for releasing the ground hook 8 from the transmission line before releasing the clamp between the ground terminal 7 and the angle member Ma.

Since the grounding short-circuit device 10 according to the embodiment has a head 72h made of a quadrangular prism member in the feed screw 72, the head 72h is operated only by the rotary tool 1 without depending on a tool such as a spanner. Can be understood intuitively.

Further, with reference to FIG. 1 or FIG. 3, the grounding terminal 7 according to the embodiment has an advantage that it is only necessary to modify a part of a commercially available clamp type grounding terminal.

The ground short-circuit device according to the present invention is expected to have the following effects.
(1) Workers can be prevented from induced electric shock.
(2) It is possible to prevent misidentification of the work procedure.
(3) The existing ground terminal can be easily modified.

The present invention employs an interlock mechanism consisting of a special key body and a ground terminal operated only by this special key body in order to prevent inductive electric shock due to an error in the installation / removal procedure of the grounding short-circuit device. There is. This interlock mechanism is expected to be applied in other fields as well.

1 Rotating tool 1s Shaft part 1w String body 7 Grounding terminal 8 Earth hook 10 Grounding short circuit device 11 Hole part 8w Earth wire 71 Clamp body 71a 1st arm 71b 2nd arm 72 Feed screw 72h Head 82 Hook part Ma Angle member (grounding) Element)

Claims (4)

A grounding terminal that can be attached and detached so that the grounding member can be energized,
A long insulating operation rod, and an earth hook arranged at the tip of the insulating operation rod and having a hook part to which an energizing body can be attached and detached.
A long ground wire having one end electrically connected to the hook and the other end electrically connected to the ground terminal is provided.
The ground terminal is
A clamp body in which a set of a first arm and a second arm are arranged to face each other, and the other end of the ground wire is connected to a base end arm projecting to the opposite side of the first arm and the second arm.
When the shaft portion is screwed with the first arm and the shaft portion is rotated in one direction, the tip portion is screwed toward the second arm, and when the shaft portion is rotated in the other direction, the first portion is described. It has a feed screw whose tip is retracted from the 2 arm,
The ground hook has a rotary tool that is moored with a string and can be detachably connected to the head of the feed screw.
The rotary tool is a grounding short-circuit device having a hole portion in a shaft portion that fits with the head of the feed screw so as to be non-rotatable. The grounding short-circuiting device according to claim 1, wherein the rotary tool includes a butterfly-shaped handle portion. The head of the lead screw is made of a prism member.
The grounding short-circuit device according to claim 1 or 2, wherein the hole of the rotary tool is a square hole into which the prism member can be introduced. The grounding short-circuit device according to any one of claims 1 to 3, wherein one end of the string is moored between the tip of the insulating operation rod and the base end of the hook.

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