JP2021015668A - Cylindrical high-voltage cutout erroneous insertion prevention cover and grounding device for high-voltage distribution lines - Google Patents

Abstract

To provide an erroneous insertion prevention cover capable of preventing an erroneous insertion of a fuse cylinder into a high-voltage cutout provided for grounding.SOLUTION: An erroneous insertion prevention cover (20) that is attached to the lower end of a high-pressure cutout (10) that includes a storage portion that can store a fuse cylinder inside and can open and close an opening for inserting the fuse cylinder is provided with a cover body (21) having fixing means for being fixed to the lower end of the high-pressure cutout, a movable plate (22) provided on the cover body to open and close the opening, and urging means (28A, 28B) that urge the movable plate in the closing direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cover for preventing erroneous insertion into a high-voltage cutout for grounding connected to a high-voltage distribution line and a grounding device for a high-voltage distribution line used when grounding the high-voltage distribution line, and particularly a cylindrical high-voltage cutout. Regarding effective technology applied to.

In electric power equipment for railways, a power transmission system is provided in which a high-voltage line that supplies three-phase AC voltage is laid along the track, stepped down by a transformer, and power is supplied to traffic lights, lighting, etc. .. In such a power transmission system, equipment that operates with a single-phase AC voltage is used as a signal or lighting, so the transformer installed between stations and connected to the high-voltage power line is a single-phase transformer. Most. However, a three-phase transformer is installed inside the station and is connected to the high-voltage power line. Further, on the primary side of each transformer connected to the high-voltage line, a high-voltage cutout is provided for each feeder line such as R phase and S phase in order to protect the transformer.

By the way, in the maintenance work on the high-voltage distribution line, it is necessary to stop the power supply to the high-voltage line at the substation and ground the high-voltage line, and ground the high-voltage line using the high-voltage cutout connected to the transformer. The technology to take is known.
Conventionally, when the work of a three-phase AC high-voltage line is carried out between stations, as shown in FIG. 8 (A), one (11A) of two adjacent transformers 11A and 11B is the power supply phase R. The phases are grounded using the high-voltage cutouts 10A and 10B connected via the watertight branch connectors 12A and 12B, and are connected to the S and T phases by the other transformer 11B. Ground using the high-voltage cutouts 10A'and 10B', or as shown in FIG. 8B, in the three-phase transformer 11C installed in the station yard, the R phase, S phase, and T phase Grounding was performed using the connected high-voltage cutouts 10A, 10B, and 10C. In addition, an arrester (lightning arrester) LA may be connected to the high-voltage line of each phase.

Japanese Unexamined Patent Publication No. 2010-259144 Japanese Unexamined Patent Publication No. 2009-152035

As mentioned above, in the conventional grounding technology using high-voltage cutout, when there is a work section in the middle of the station, the work section is purposely visited to the adjacent transformer installation location or the three-phase transformer installation location in the station yard to ground. After the work was completed and the work between stations was completed, it was necessary to move to the adjacent transformer installation location or the station yard again to release the grounding, which forced a very inefficient work form.
As a grounding technique using a high-voltage cutout, for example, there is a grounding method using a high-voltage cutout tool disclosed in Patent Document 1. This high-voltage cutout tool is devised so that after the fuse cylinder in the high-voltage cutout is pulled out, the tip electrode portion of the tool can be inserted and brought into contact with the internal terminal electrode. However, Patent Document 1 does not describe the above-mentioned problems and means for solving the problems when the work is carried out in the single-phase load section of the three-phase AC high-voltage line.

For example, in a transformer in which high-voltage cutouts 10A and 10B are connected to the R phase and the S phase, the present inventors also connect the high-voltage cutout 10C to the remaining T phase as shown in FIG. 8C. Then, I thought about making it available for grounding at the beginning of work. The high-voltage cutout 10C does not have a built-in fuse cylinder, and when the work of the high-voltage line is performed, a grounding tool as described in Patent Document 1 is inserted, so that the high-voltage line (T) Phase) is grounded. However, if the high-voltage cutout 10C for grounding as described above is provided, a person who does not know the fact notices that the fuse cylinder is not inserted in the high-voltage cutout when inspecting the equipment along the track. It was found that there is a problem that the fuse cylinder may be inserted by mistake.

Further, as a technique related to the present invention, there is an invention relating to a cover lid for closing an opening of a high-pressure cutout described in Patent Document 2. However, since the cover lid of the high-voltage cutout of Patent Document 2 is built in the lower part of the high-voltage cutout, it is necessary to modify the high-voltage cutout, which causes an increase in cost. Further, although the cover lid of Patent Document 2 can close the opening, it has a structure in which the fuse cylinder can be inserted, so that there is a problem that the fuse cylinder may be inserted by mistake. ..

The present invention has been made in view of the above problems, and provides an erroneous insertion prevention cover capable of preventing an erroneous insertion of a fuse cylinder into a high-voltage cutout provided for grounding. The purpose.
Another object of the present invention is to provide an inexpensive misinsertion prevention cover that does not require modification of the high pressure cutout and can be attached to any form of high pressure cutout.
Yet another object of the present invention is to go to a three-phase transformer installation location or an adjacent transformer installation location in the station yard to perform grounding work when performing work in a single-phase load section of a three-phase AC high-voltage line. It is an object of the present invention to provide a grounding device for a high-voltage distribution line capable of grounding all three-phase power supply lines at the installation location of a transformer to be worked without performing the above.

In order to solve the above problems, the present invention
An erroneous insertion prevention cover that is attached to the end of the main body of a high-pressure cutout that has a storage unit that can store the fuse cylinder inside, and that can open and close the opening for inserting the fuse cylinder.
A cover body with fixing means for fixing to the lower end of the high pressure cutout,
A movable plate provided on the cover body to open and close the opening,
An urging means for urging the movable plate in the closing direction and
It was configured to have.

According to the above configuration, the opening for inserting the fuse cylinder of the high pressure cutout can be closed by the movable plate urged by the urging means, so that the fuse cylinder is not inserted inside. It becomes impossible to see the state, and it is possible to prevent the fuse cylinder from being inserted by mistake. In addition, since the cover body is provided with a fixing means for fixing to the lower end of the high-voltage cutout, there is no need to modify the high-voltage cutout, and any form of high-voltage cutout can be attached. It is possible to avoid a significant cost increase.

Here, preferably, it is configured to include a tubular passage restricting member provided inside the movable plate to allow the passage of the grounding tool while preventing the passage of the fuse cylinder insertion tool.
According to such a configuration, since the tubular passage restricting member can prevent the fuse cylinder insertion tool from passing through, it is possible to reliably prevent the fuse cylinder from being inserted by mistake.

Also, preferably, the movable plate is configured to be slidable along a guide groove provided in the bottom wall of the cover body.
The movable plate is formed with an opening through which the grounding tool can pass.
In a state where the movable plate is moved by the urging force of the urging means, the opening of the movable plate does not coincide with the tubular passage restricting member.
When the movable plate is moved against the urging force of the urging means, the opening of the movable plate is configured to coincide with the tubular passage restricting member.

According to the above configuration, in the state where the grounding tool is not inserted, the movable plate moves by the urging force (restoring force) of the urging means (pulling spring), and the opening of the movable plate and the tubular shape. Since the inside of the high-pressure cutout cannot be seen from the outside because the passage restricting member is displaced, the state where the fuse cylinder is not inserted cannot be seen from the outside, and the fuse cylinder is inserted by mistake. It is possible to prevent it from being done more reliably.

Further, preferably, the fixing means comprises a tightening screw provided corresponding to a mounting hole for a secondary terminal of the high voltage cutout.
When the tip of the tightening screw enters the mounting hole of the secondary terminal, the cover body is configured to be connected to the lower end of the high-voltage cutout.
According to such a configuration, the fixing means includes a tightening screw for fixing the cover body to the lower end of the high-voltage cutout by using the mounting hole of the secondary side terminal of the high-voltage cutout, so that the cover body can be securely attached. It can be fixed and the size of the device can be reduced.

Further, the grounding device for a high-voltage distribution line according to another invention of the present application is
A high-voltage cutout erroneous insertion prevention cover with the above configuration,
It has a storage unit that can store the fuse cylinder inside, and has a high-voltage cutout in which the primary terminal provided at the top of the storage unit is connected to a high-voltage line.
The high-voltage cutout does not have a fuse tube and a secondary terminal, and the misinsertion prevention cover is attached to the lower end.
The movable plate is opened by a grounding tool having an electrode portion at the tip that can be electrically connected to the primary terminal and a grounding cord that is electrically connected to the electrode portion from the other end. The high-voltage line can be connected to the grounding point by being inserted into the high-voltage cutout through the opening in the closed state.

According to this configuration, when performing work in a single-phase load section of a three-phase AC high-voltage line, it is necessary to go to the three-phase transformer installation location in the station yard or the adjacent transformer installation location to perform grounding work. All three-phase power supply lines can be grounded at the installation location of the transformer to be worked by simply inserting a grounding tool through the opening for inserting the fuse tube in the high-voltage cutout. The time required for the work can be significantly reduced. Further, since the erroneous insertion prevention cover capable of opening and closing the opening for inserting the fuse cylinder of the high voltage cutout is provided, it is possible to prevent the fuse cylinder from being erroneously inserted.

According to the erroneous insertion prevention cover of the present invention, it is possible to prevent the fuse cylinder from being erroneously inserted into the high voltage cutout provided for grounding. In addition, it is not necessary to modify the high-voltage cutout, and any form of high-voltage cutout can be attached, and a significant cost increase can be avoided.
Further, according to the grounding device for a high-voltage distribution line of the present invention, when performing work in a single-phase load section of a three-phase AC high-voltage line, it is purposely installed at a three-phase transformer installation location in the station yard or an adjacent transformer. There is an effect that all the power supply lines of each phase can be grounded at the place where the transformer to be worked is installed without going to the place to perform the grounding work.

An embodiment of a cutout erroneous insertion prevention cover according to the present invention is shown, (A) is a perspective view showing the structure of the erroneous insertion prevention cover, and (B) is a cover with the regulating member and the movable plate removed. It is a perspective view which shows the main body. (A) is a perspective view showing a state in which the cover main body with the movable plate removed is viewed from diagonally below, and (B) is a perspective view showing a state in which the erroneous insertion prevention cover is viewed from diagonally below. It is a front sectional view which shows the internal structure of the misinsertion prevention cover which concerns on embodiment. It is a figure which shows an example of the grounding tool and the fuse cylinder insertion tool. (A) is a side view showing an example of a high-voltage cutout to which the erroneous insertion prevention cover of the present embodiment is attached, and (B) is a bottom view thereof. It is a front view which shows the state which the grounding tool is inserted into the grounding device for a high voltage distribution line which attached the erroneous insertion prevention cover under the high voltage cutout. It is a schematic block diagram which shows the other embodiment of the grounding device for a high voltage distribution line which concerns on this invention. (A) is a diagram showing a grounding method when performing work on a three-phase AC high-voltage line between stations, and (B) is a diagram showing a grounding method when grounding is performed on the three-phase transformer side in the station yard. (C) is a diagram showing a grounding method when grounding is performed by one single-phase transformer between stations.

Hereinafter, embodiments of the cutout erroneous insertion prevention cover according to the present invention will be described in detail with reference to the drawings.
1 to 3 are views showing one embodiment of the cutout erroneous insertion prevention cover according to the present invention, and FIG. 4 is a grounding tool inserted into the high pressure cutout and a fuse cylinder for inserting the fuse tube into the high pressure cutout. A perspective view showing the configuration of the insertion tool, FIG. 5 is a diagram showing an example of a high-voltage cutout, and FIG. 6 is a diagram showing a state in which the erroneous insertion prevention cover is attached to the high-voltage cutout.

First, the configuration of the erroneous insertion prevention cover 20 of the present embodiment will be described in detail with reference to FIGS. 1 to 3. FIG. 1A is a perspective view showing a state in which the erroneous insertion prevention cover 20 is viewed from diagonally above, FIG. 2B is a perspective view showing a state in which the erroneous insertion prevention cover 20 is viewed from below, and FIG. 3 is a sectional view. Is.
As shown in FIG. 1A, the erroneous insertion prevention cover 20 of the present embodiment includes a cover body 21 having a rectangular frame shape and a movable plate 22 slidably provided in the lower part of the cover body 21 in the lateral direction. A pair of synthetic resin tightening screws 23A and 23B screwed into screw holes formed in the opposite side wall portions of the cover main body 21, and the tightening screws 23A and 23B and the side wall portion of the cover main body 21. It includes washers 24A and 24B made of synthetic resin interposed between them, and a cylindrical regulating member 25 mounted in the center of the bottom of the cover main body 21.

The movable plate 22 and the regulating member 25 are made of an insulating synthetic resin. A stopper piece 22a protruding upward is formed at the tip end portion (left end in FIG. 1) of the movable plate 22, and a handle portion 22b is fixed to the rear end portion (right end in FIG. 1) of the movable plate 22. There is. A locking pin 26A is planted on the side surface of the handle portion 22b.
Although not shown in FIG. 1, a locking pin 26B is also planted on the side surface of the handle portion 22b on the opposite side.

Further, parallel cut surfaces 23a and 23b are formed on the heads of the tightening screws 23A and 23B so that the operator can turn them by hand.
The cover body 21 is also made of an insulating material such as synthetic resin, and as shown in FIG. 1 (B), the bottom wall is inside through a gap between the side wall of the cover body 21 and the outer wall of the high-voltage cutout. A drain hole 21d for draining the rainwater that has entered the space is provided.

Further, as shown in FIG. 2A, recesses 21a are formed on the lower surface of the bottom wall of the cover body 21, and a pair of guide grooves 21b parallel to each other are formed on both sides of the recesses 21a. As shown in 2 (B), by engaging both ends of the movable plate 22 with the pair of guide grooves 21b, the movable plate 22 is slidably housed in the recess 21a along the guide groove 21b. There is. A circular opening 22c is formed in the center of the movable plate 22.
Further, a pair of locking pins 27A and 27B are planted on both sides of the recess 21a on the bottom wall of the cover body 21, and the locking pins 27A and 27B and the locking pins on the side surfaces of the handle portion 22b are provided. Tension springs 28A and 28B are stretched between the 26A and 26B, and the movable plate 22 is urged in a direction in which the handle portion 22b contacts the side surface of the cover main body 21.

As a result, when the handle portion 22b is grasped and the movable plate 22 is pulled and slid against the spring force of the springs 28A and 28B, the stopper piece 22a comes into contact with the side surface of the cover body 21 to prevent movement. It is configured.
Further, in the erroneous insertion prevention cover 20 of the present embodiment, as shown in FIG. 3, an opening 21c is formed in the bottom wall of the cover main body 21, and the lower end portion of the cylindrical regulating member 25 is formed in the opening 21c. It is joined and fixed by, for example, four screws 29.

FIG. 4 shows a configuration example of the grounding tool 31 and the fuse cylinder insertion tool 32.
The grounding tool 31 has an electrode portion 31A and an insulating body portion 31B at the tip capable of contacting the primary terminal on the upper portion of the high-voltage cutout 10, and an insulating handle portion 31C at the lower portion as shown in FIG. A grounding cord 31D is pulled out from the handle portion 31B, and the end portion of the cord 31D passes through the insulating body portion 31B and is electrically connected to the electrode portion 31A.
On the other hand, the insertion tool 32 is provided with a recess 32B at the tip to which the fuse cylinder can be engaged. An operating rod is connected to the opposite end of the recess 32B. Since the insertion tool 32 has the same configuration as a known one used for inserting the fuse cylinder, detailed description thereof will be omitted.

As can be seen by comparing the grounding tool 31 and the fuse cylinder insertion tool 32 shown in FIG. 4, the tip side of the grounding tool 31 and the tip side of the insertion tool 32 have almost the same diameter, but for inserting the fuse cylinder. The tool 32 is provided with a screw 32A for connecting to the end of the operating rod near the end on the opposite side of the recess 32B, and the diameter is increased by that amount.
The inner diameter of the restricting member 25 of the erroneous insertion prevention cover 20 is designed to be slightly smaller than the diameter of the threaded portion of the fuse cylinder inserting tool 32, whereby the restricting member 25 is the grounding tool 31. The tip is allowed to be inserted all the way to the back of the high pressure cutout, but the fuse tube insertion tool 32 prevents it from being inserted all the way to the back of the high pressure cutout so that the fuse tube can be prevented from being inserted incorrectly. It is configured.

Further, as shown in FIG. 5, at the lower end of the high-voltage cutout 10, mounting holes 10a for mounting a pair of metal secondary terminals are provided at two locations so as to face each other. The erroneous insertion prevention cover 20 of the embodiment is configured so that the tips of the tightening screws 23A and 23B can enter the two mounting holes 10a.
As a result, the erroneous insertion prevention cover 20 can be firmly fixed to the lower end portion of the high-voltage cutout 10, and the erroneous insertion prevention cover 20 can be fixed to a relatively low position of the high-voltage cutout 10. The insertion prevention cover 20 can be miniaturized. The tightening screws 23A and 23B are not limited to those using the secondary side terminal mounting holes 10a, and may be fixed by using other parts of the high voltage cutout 10.

Further, after the erroneous insertion prevention cover 20 is attached to the high-voltage cutout 10, when the movable plate 22 is slid against the spring force of the pulling springs 28A and 28B, the opening 22c of the movable plate 22 opens the regulating member 25. As shown in FIG. 6, the tip electrode portion 31A of the grounding tool 31 to which the grounding cord 31D is connected can be inserted, whereby the high voltage line can be grounded.
Further, when the grounding tool 31 is pulled out after the work of the high-voltage line is completed, the movable plate 22 is slid by the spring force of the tension springs 28A and 28B, and the movable plate 22 closes the lower end opening of the regulating member 25. , It becomes impossible to see from the outside that the fuse cylinder is not inserted, and it is possible to prevent the fuse cylinder from being inserted incorrectly.

The high-voltage cutout to which the erroneous insertion prevention cover of the above embodiment is applied is provided with a storage portion for storing the fuse cylinder in the upper part of the cutout main body, as disclosed in Patent Document 2, for example. An electrode with which the fuse cylinder contacts is formed at the upper end, and a primary terminal connected to this electrode is provided at the upper end of the cutout main body. In addition, a secondary side electrode is formed at the lower end of the fuse cylinder housing, and a secondary side terminal that is electrically connected to this secondary side electrode and projects laterally is provided at the bottom of the cutout body. Has been done. However, the high voltage cutout used in the present embodiment is arranged in the vicinity of the transformer with the secondary terminal removed.

Next, another embodiment of the grounding device for a high-voltage distribution line provided with a cover for preventing erroneous insertion of a high-voltage cutout according to the present invention will be described with reference to FIG.
As shown in FIG. 7, the high-voltage distribution line grounding device of the present embodiment has a high-voltage cutout 10 primary terminal 10c to which at least one secondary terminal 10b is attached and a fuse cylinder is not attached. , It is connected to a high-voltage line (for example, T-phase) that is not connected to a single-phase transformer, and a grounding cord 13 is connected to the secondary side terminal 10b of the high-voltage cutout 10.

In the high-voltage distribution line grounding device of this embodiment, the grounding tool 31'is inserted into the high-voltage cutout 10 to which the fuse cylinder is not attached before the work of the high-voltage line is performed. As shown in FIG. 7, the grounding tool 31'is a tool to which the grounding cord 31A is not connected, unlike the grounding tool 31 shown in FIG.
Also in this embodiment, it is desirable that the erroneous insertion prevention cover 20 capable of closing the opening (fuse cylinder insertion port) at the lower end of the high-voltage cutout 10 is attached. By attaching the erroneous insertion prevention cover 20, it is possible to prevent the fuse cylinder from being erroneously inserted after the work of the high-voltage line is completed. Further, during the work, as in FIG. 6, the lower end of the inserted grounding tool 31'protrudes downward from the erroneous insertion prevention cover 20, so that it is possible to prevent forgetting to remove the grounding tool. ..

In the present embodiment, since the secondary side terminal is attached to the secondary side terminal mounting hole of the high voltage cutout 10, the pair of tightening screws 23A and 23B of the erroneous insertion prevention cover 20 of the above embodiment , It is configured to tighten using a part other than the secondary terminal mounting hole. Instead of the tightening screws 23A and 23B, a mounting bracket having the same structure as the mounting band for utility poles may be used to mount the erroneous insertion prevention cover 20 on the high voltage cutout.

Although the present invention has been described above based on the embodiment, the present invention is not limited to the above embodiment and can be appropriately modified. For example, in the above embodiment, the erroneous insertion prevention cover 20 is attached to the high voltage cutout 10 by a pair of tightening screws 23A and 23B, but instead of the tightening screws, a mounting bracket having the same configuration as the mounting band for utility poles is used. It may be configured to attach the misinsertion prevention cover to the high pressure cutout. Further, in the above embodiment, the movable plate 22 that slides laterally to open and close the opening of the high-pressure cutout is provided, but an opening / closing lid that rotates vertically to open and close the opening of the high-pressure cutout is provided. It may be provided.

10 High-pressure cutout 11 Transformer 13 Grounding cord 20 False insertion prevention cover 21 Cover body 22 Movable plate 22a Stopper piece 22b Handle part 23A, 23B Tightening screw 24 Washer 25 Regulatory member 28A, 28B Tension spring 31 Grounding tool 31A Electrode part 31D Grounding cord 32 Fuse tube insertion tool

Claims (5)

An erroneous insertion prevention cover that is attached to the end of the main body of a high-pressure cutout that has a storage unit that can store the fuse cylinder inside, and that can open and close the opening for inserting the fuse cylinder.
A cover body with fixing means for fixing to the lower end of the high pressure cutout,
A movable plate provided on the cover body to open and close the opening,
An urging means for urging the movable plate in the closing direction and
A high-voltage cutout prevention cover that is characterized by being equipped with. The high-pressure cutout according to claim 1, further comprising a tubular passage restricting member provided inside the movable plate to allow the passage of the grounding tool while preventing the passage of the fuse cylinder insertion tool. Incorrect insertion prevention cover. The movable plate is configured to be slidable along a guide groove provided on the bottom wall of the cover body.
The movable plate is formed with an opening through which the grounding tool can pass.
In a state where the movable plate is moved by the urging force of the urging means, the opening of the movable plate does not coincide with the tubular passage restricting member.
A claim characterized in that, in a state where the movable plate is moved against the urging force of the urging means, the opening of the movable plate is configured to coincide with the tubular passage restricting member. The cover for preventing erroneous insertion of the high-voltage cutout according to item 2. The fixing means includes a tightening screw provided corresponding to a mounting hole for a secondary terminal of the high voltage cutout.
Claims 1 to 3 characterized in that the cover body is configured to be coupled to the lower end of the high-voltage cutout by the tip of the tightening screw entering the mounting hole of the secondary terminal. The high-voltage cutout prevention cover described in either. The high-voltage cutout erroneous insertion prevention cover according to any one of claims 1 to 4.
It has a storage unit that can store the fuse cylinder inside, and has a high-voltage cutout in which the primary terminal provided at the top of the storage unit is connected to a high-voltage line.
The high-voltage cutout does not have a fuse tube and a secondary terminal, and the misinsertion prevention cover is attached to the lower end.
The movable plate is opened by a grounding tool having an electrode portion at the tip that can be electrically connected to the primary terminal and a grounding cord that is electrically connected to the electrode portion from the other end. A grounding device for a high-voltage distribution line, characterized in that the high-voltage line can be connected to a grounding point by being inserted into the high-voltage cutout through the opening in a grounded state.

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