JP7185599B2 - Mis-insertion prevention cover for cylindrical high-voltage cutouts and grounding device for high-voltage distribution lines - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an erroneous insertion prevention cover 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, particularly a cylindrical high-voltage cutout. It relates to effective technology applied to.

In power facilities for railways, a high-voltage line that supplies three-phase AC voltage is laid along the track, and a power transmission system is provided in which the voltage is stepped down by a transformer and power is supplied to traffic lights, lighting, etc. . In such a power transmission system, devices that operate on single-phase AC voltage are used as signals and lighting lights, so the transformers installed between stations and connected to the high-voltage lines for lighting power are single-phase transformers. Mostly. However, a three-phase transformer is installed in the station premises, and it is connected to the light power high-voltage line. Further, on the primary side of each transformer connected to the high-voltage line, a high-voltage cutout is provided for each of the R-phase, S-phase, and other feeder lines in order to protect the transformer.

By the way, in maintenance work on high-voltage distribution lines, it is necessary to ground the high-voltage line while stopping power supply to the high-voltage line at a substation or the like. is known.
Conventionally, when carrying out work on a three-phase AC high-voltage line between stations, as shown in FIG. High-voltage cutouts 10A and 10B connected to the phase and S phase via watertight branch connectors 12A and 12B are grounded, and the other transformer 11B is connected to the S and T phases. Either the high-voltage cutouts 10A' and 10B' are used for grounding, or as shown in FIG. Grounding has been performed using the connected high voltage cutouts 10A, 10B, and 10C. Also, an arrester (lightning arrester) LA may be connected to the high voltage line of each phase.

JP 2010-259144 A JP 2009-152035 A

As described above, with the conventional grounding technology using high-voltage cutouts, if there is a work section in the middle of a station, it is necessary to go out of the way from the work section to the installation location of the adjacent transformer or the installation location of the three-phase transformer within the station premises. After the work is done and the work between stations is completed, it is necessary to move to the adjacent transformer installation place or the station premises again to release the grounding, which has forced a very inefficient work style.
As a grounding technique using a high-pressure cutout, there is a grounding method using a high-pressure cutout tool disclosed in Patent Document 1, for example. 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 Literature 1 does not describe the above-described problems and means for solving the problems when working in a single-phase load section of a three-phase AC high-voltage line.

For example, in a transformer in which high-voltage cutouts 10A and 10B are connected to the R and S phases, the remaining T-phase is also connected to a high-voltage cutout 10C as shown in FIG. and make it available for grounding at the start of work. The high-voltage cutout 10C does not contain a fuse cylinder. phase) is grounded. However, if the high-voltage cutout 10C for grounding as described above is provided, a person who is unaware of the fact may notice that the fuse cylinder is not inserted into the high-voltage cutout when inspecting the trackside facilities. It was found that there was a problem that there was a risk of inserting the fuse cylinder by mistake.

Further, as a technique related to the present invention, there is an invention relating to a cover lid that closes an opening of a high pressure cutout, which is described in Japanese Patent Application Laid-Open No. 2002-200021. However, since the cover lid of the high-pressure cutout of Patent Document 2 is built in the lower part of the high-pressure cutout, it is necessary to modify the high-pressure cutout, resulting in an increase in cost. In addition, the cover lid of Patent Document 2 can close the opening but allows the insertion of the fuse cylinder, so there is a problem that the fuse cylinder may be accidentally inserted. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide an erroneous insertion prevention cover capable of preventing erroneous insertion of a fuse cylinder into a high-voltage cutout provided for grounding. aim.
Another object of the present invention is to provide an inexpensive misinsertion prevention cover that can be installed on any form of high pressure cutout without the need to modify the high pressure cutout.
Still another object of the present invention is to go to the place where a three-phase transformer is installed in the station premises or the place where an adjacent transformer is installed when performing work in a single-phase load section of a three-phase AC high-voltage line. To provide a grounding device for a high-voltage distribution line capable of grounding all three-phase feeder lines at a place where a transformer to be worked is installed without performing a work.

In order to solve the above problems, the present invention
An erroneous insertion prevention cover that is attached to the end of a body of a high-voltage cutout having a storage portion capable of storing a fuse cylinder inside and that can open and close an opening for inserting the fuse cylinder,
a cover body having fastening means for fastening to the lower end of the high pressure cutout;
a movable plate provided on the cover body for opening and closing the opening;
biasing means for biasing the movable plate in the closing direction;
configured to have

According to the above configuration, since the opening for inserting the fuse cylinder of the high-voltage cutout can be closed by the movable plate biased by the biasing means, the fuse cylinder is not inserted inside. It becomes impossible to see the state, and it is possible to prevent erroneous insertion of the fuse cylinder. In addition, since the cover body is provided with fixing means for fixing to the lower end of the high pressure cutout, it is possible to install any form of high pressure cutout without having to modify the high pressure cutout, A significant cost increase can be avoided.

Here, it is preferable that a cylindrical passage restricting member is provided inside the movable plate to allow passage of the grounding tool and prevent passage of the fuse tube insertion tool.
According to such a configuration, the passage of the fuse tube insertion tool can be prevented by the tubular passage restricting member, so that it is possible to reliably prevent the fuse tube from being erroneously inserted.

Further, desirably, the movable plate is configured to be slidable along a guide groove provided on the bottom wall of the cover body,
an opening through which the grounding tool can pass is formed in the movable plate;
When the movable plate is moved by the biasing force of the biasing means, the opening of the movable plate does not match the cylindrical passage restricting member,
In a state in which the movable plate is moved against the biasing force of the biasing means, the opening of the movable plate is configured to coincide with the tubular passage restricting member.

According to the above configuration, when the grounding tool is not inserted, the movable plate is moved by the biasing force (restoring force) of the biasing means (tension spring), and the opening of the movable plate and the cylindrical shape are moved. Since the passage restricting member is misaligned, the inside of the high-voltage cutout cannot be seen from the outside, so the fuse cylinder cannot be seen from the outside without being inserted, and the fuse cylinder is inserted by mistake. can be prevented more reliably.

Further, desirably, the fixing means comprises a tightening screw provided corresponding to the mounting hole of the secondary terminal of the high voltage cutout,
The tip of the tightening screw is inserted into the mounting hole of the secondary terminal, thereby connecting the cover body to the lower end of the high pressure cutout.
According to such a configuration, the fixing means includes a fastening screw for fixing the cover body to the lower end portion of the high voltage cutout using the mounting hole of the secondary side terminal of the high voltage cutout, so that the cover body can be securely attached. In addition to being able to be fixed, the size of the device can be reduced.

Further, a grounding device for high-voltage distribution lines according to another invention of the present application,
a high-pressure cutout erroneous insertion prevention cover having the above configuration;
a high-voltage cutout in which a storage part capable of storing a fuse cylinder is provided inside, and a primary side terminal provided on the upper part of the storage part is connected to a high-voltage line,
The high-voltage cutout does not have a fuse cylinder and a secondary terminal, and the erroneous insertion prevention cover is attached to the lower end,
A grounding tool having an electrode portion electrically connectable to the primary side terminal at one end thereof and a grounding cord electrically connected to the electrode portion extending from the other end thereof, wherein the movable plate is opened. The high-voltage line can be connected to a ground point by inserting the high-voltage line into the high-voltage cutout through the opening in a detached state.

According to such a configuration, when performing work in a single-phase load section of a three-phase AC high-voltage line, it is not necessary to go out of the way to install a three-phase transformer in the station premises or an adjacent transformer installation place to perform grounding work. Instead, by simply inserting a grounding tool through the opening for inserting the fuse cylinder in the high-voltage cutout, it is possible to ground all three phases of the power supply line at the installation location of the transformer to be worked on. The time required for work can be greatly reduced. In addition, since the erroneous insertion prevention cover that can open and close the opening for inserting the high-voltage cutout fuse cylinder 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. Also, there is no need to modify the high pressure cutout, and any form of high pressure cutout can be installed, avoiding significant cost increases.
Furthermore, according to the high-voltage distribution line grounding device of the present invention, when carrying out work in a single-phase load section of a three-phase AC high-voltage line, it is necessary to install a three-phase transformer in the station premises or an adjacent transformer. There is an effect that the power supply lines of all the phases can be grounded at the place where the transformer to be worked is installed without having to go to the place and perform the grounding work.

1A is a perspective view showing the structure of an erroneous insertion prevention cover for a cutout according to an embodiment of the present invention; FIG. 1B is a cover with a regulating member and a movable plate removed; It is a perspective view which shows a main body. (A) is a perspective view showing the cover main body from which the movable plate is removed, as seen obliquely from below, and (B) is a perspective view showing the state of the erroneous insertion prevention cover as seen obliquely from below. It is a front cross-sectional view showing the internal structure of the erroneous insertion prevention cover according to the embodiment. FIG. 4 is a diagram showing an example of a grounding tool and a fuse tube insertion tool; (A) is a side view showing an example of a high-pressure cutout to which the erroneous insertion prevention cover of this embodiment is attached, and (B) is a bottom view thereof. FIG. 10 is a front view showing a state in which a grounding tool is inserted into the high-voltage distribution line grounding device in which an erroneous insertion prevention cover is attached to the lower portion of the high-voltage cutout. FIG. 2 is a schematic configuration diagram showing another embodiment of the grounding device for high-voltage distribution lines according to the present invention; (A) is a diagram showing the grounding method when working on a three-phase AC high-voltage line between stations, (B) is a diagram showing the grounding method when grounding the three-phase transformer side in the station premises, (C) is a diagram showing a grounding method when one single-phase transformer between stations is grounded.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cover for preventing incorrect insertion of cutouts according to the present invention will be described in detail below with reference to the drawings.
FIGS. 1 to 3 show an embodiment of a cutout erroneous insertion prevention cover according to the present invention, and FIG. 4 shows a grounding tool to be inserted into the high voltage cutout and a fuse tube for inserting the fuse cylinder into the high voltage cutout. FIG. 5 is a perspective view showing the configuration of an insertion tool, FIG. 5 is a diagram showing an example of a high pressure cutout, and FIG. 6 is a diagram showing a state in which an erroneous insertion prevention cover is attached to the high pressure cutout.

First, the configuration of the erroneous insertion prevention cover 20 of this embodiment will be described in detail with reference to FIGS. 1 to 3. FIG. FIG. 1A is a perspective view of the erroneous insertion prevention cover 20 as viewed obliquely from above, FIG. 2B is a perspective view of the erroneous insertion prevention cover 20 as viewed from below, and FIG. 3 is a sectional view. is.
As shown in FIG. 1A, the erroneous insertion prevention cover 20 of this embodiment includes a cover main body 21 having a rectangular frame shape and a movable plate 22 provided below the cover main body 21 so as to be slidable in the horizontal direction. , a pair of synthetic resin fastening screws 23A and 23B screwed into screw holes formed in the opposing side walls of the cover body 21, and the fastening screws 23A and 23B and the side walls of the cover body 21. It is provided with synthetic resin washers 24A and 24B interposed therebetween and a cylindrical restricting member 25 attached to the center of the bottom of the cover body 21 .

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

Parallel cut surfaces 23a and 23b are formed on the heads of the tightening screws 23A and 23B so that the operator can manually turn them.
The cover body 21 is also made of an insulating material such as synthetic resin, and as shown in FIG. A drain hole 21d is provided for draining rainwater that has entered the .

Further, as shown in FIG. 2A, a recess 21a is formed in the lower surface of the bottom wall of the cover body 21, and a pair of guide grooves 21b are formed in parallel with each other on both sides of the recess 21a. As shown in 2B, the movable plate 22 is accommodated in the concave portion 21a so as to be slidable along the guide grooves 21b by engaging both side ends of the movable plate 22 with the pair of guide grooves 21b. there is A circular opening 22 c is formed in the center of the movable plate 22 .
A pair of locking pins 27A, 27B are implanted on both sides of the concave portion 21a of the bottom wall of the cover body 21, and the locking pins 27A, 27B and the side locking pin of the handle portion 22b are attached. Tension springs 28A and 28B are stretched between the plate 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 body 21. As shown in FIG.

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

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

As can be seen from a comparison of the grounding tool 31 and the fuse cylinder inserting tool 32 shown in FIG. The tool 32 is provided with a screw 32A for coupling with the end of the operating rod near the end on the opposite side of the recess 32B, and the diameter is increased accordingly.
The regulating member 25 of the erroneous insertion prevention cover 20 is designed to have an inner diameter that is slightly smaller than the diameter of the threaded portion of the fuse tube insertion tool 32 . Although the tip is allowed to be inserted deep into the high voltage cutout, the fuse cylinder insertion tool 32 prevents insertion into the deep part of the high voltage cutout, thereby preventing erroneous insertion of the fuse cylinder. It is configured.

As shown in FIG. 5, the lower end of the high-voltage cutout 10 is provided with two mounting holes 10a for mounting a pair of secondary terminals made of metal 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 of the high pressure cutout 10, and the erroneous insertion prevention cover 20 can be fixed to a relatively low position of the high pressure cutout 10, thereby preventing erroneous insertion. The insertion prevention cover 20 can be made smaller. The tightening screws 23A and 23B are not limited to those using the secondary side terminal mounting holes 10a, and may be fixed using other portions of the high voltage cutout 10. FIG.

Further, after attaching the erroneous insertion prevention cover 20 to the high-pressure cutout 10, when the movable plate 22 is slid against the spring force of the tension springs 28A and 28B, the opening 22c of the movable plate 22 becomes the opening of the regulating member 25. Then, 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, thereby grounding the high voltage line.
Further, when the grounding tool 31 is pulled out after the high-voltage wire work 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. In addition, it becomes impossible to see from the outside that the fuse cylinder is not inserted, thereby preventing erroneous insertion of the fuse cylinder.

The high-voltage cutout to which the erroneous insertion prevention cover of the above embodiment is applied is provided with a storage section for storing a fuse cylinder in the upper portion of the cutout 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 side terminal connected to this electrode is provided at the upper end of the cutout body. A secondary electrode is formed at the lower end of the housing portion of the fuse cylinder, and a secondary terminal electrically connected to the secondary electrode and protruding sideways is provided at the lower portion of the cutout body. It is However, the high voltage cutout used in this embodiment is arranged near the transformer with the secondary side terminals disconnected.

Next, another embodiment of a grounding device for a high voltage distribution line provided with a high voltage cutout erroneous insertion prevention cover according to the present invention will be described with reference to FIG.
As shown in FIG. 7, the grounding device for a high-voltage distribution line of this embodiment has at least one secondary-side terminal 10b and a primary-side terminal 10c of a high-voltage cutout 10 to which no fuse cylinder is attached. , 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 in which the fuse cylinder is not attached before working on the high-voltage line. 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 the present embodiment, it is desirable that the erroneous insertion prevention cover 20 capable of closing the opening (fuse tube insertion opening) 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 finishing the work on the high voltage line. During operation, the lower end of the inserted grounding tool 31' protrudes downward from the erroneous insertion prevention cover 20 as in FIG. .

In this embodiment, since the secondary terminal is attached to the secondary terminal attachment 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 is , is configured to be tightened using a portion other than the secondary side terminal mounting hole. Instead of the tightening screws 23A and 23B, a mounting bracket having a structure similar to that of a utility pole mounting band may be used to mount the erroneous insertion prevention cover 20 to the high voltage cutout.

As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above embodiments and can be modified as appropriate. 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 a structure similar to that of a utility pole mounting band is used. may be used to attach the misinsertion prevention cover to the high voltage cutout. In the above-described embodiment, the movable plate 22 that slides in the horizontal direction to open and close the opening of the high pressure cutout is provided. You may set it.

REFERENCE SIGNS LIST 10 high voltage cutout 11 transformer 13 grounding cord 20 erroneous insertion prevention cover 21 cover main body 22 movable plate 22a stopper piece 22b grip portion 23A, 23B tightening screw 24 washer 25 regulating member 28A, 28B tension spring 31 grounding tool 31A electrode portion 31D Grounding cord 32 Tool for inserting fuse cylinder

Claims (5)

An erroneous insertion prevention cover that is attached to the end of a body of a high-voltage cutout having a storage portion capable of storing a fuse cylinder inside and that can open and close an opening for inserting the fuse cylinder,
a cover body having fastening means for fastening to the lower end of the high pressure cutout;
a movable plate provided on the cover body for opening and closing the opening;
biasing means for biasing the movable plate in the closing direction;
A high pressure cutout misinsertion prevention cover comprising: 2. The high-pressure cutout according to claim 1, further comprising a cylindrical passage restricting member provided inside said movable plate that allows passage of a grounding tool and prevents passage of a fuse tube 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,
an opening through which the grounding tool can pass is formed in the movable plate;
When the movable plate is moved by the biasing force of the biasing means, the opening of the movable plate does not match the cylindrical passage restricting member,
In a state in which the movable plate is moved against the biasing force of the biasing means, the opening of the movable plate is configured to coincide with the cylindrical passage restricting member. 3. A high pressure cutout erroneous insertion prevention cover according to item 2. The fixing means comprises a tightening screw provided corresponding to the mounting hole of the secondary terminal of the high voltage cutout,
The cover body is configured to be coupled to the lower end of the high-pressure cutout by the tip of the tightening screw entering the mounting hole of the secondary terminal. A misinsertion prevention cover for the high pressure cutout according to any of the preceding claims. A high-pressure cutout erroneous insertion prevention cover according to any one of claims 1 to 4;
a high-voltage cutout in which a storage part capable of storing a fuse cylinder is provided inside, and a primary side terminal provided on the upper part of the storage part is connected to a high-voltage line,
The high-voltage cutout does not have a fuse cylinder and a secondary terminal, and the erroneous insertion prevention cover is attached to the lower end,
A grounding tool having an electrode portion electrically connectable to the primary side terminal at one end thereof and a grounding cord electrically connected to the electrode portion extending from the other end thereof, wherein the movable plate is opened. A grounding device for a high-voltage distribution line, wherein the high-voltage line can be connected to a grounding point by being inserted into the high-voltage cutout through the opening in a detached state.

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