JPH1041106A - Lightning arrester for car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time required for maintenance work of insulating tube cleaning, etc., by reducing the amount of contaminant which sticks to a lightning arrester insulating tube, while bursting performance is maintained well. SOLUTION: A lightning arrester body 13 which is provided with an insulating tube 12 and mounted on a roof of an electric car, a protective cover 15. covering the lightning arrester body 13, wherein holes 16 and 17 are opened on the side surface below the insulating tube 12 and the top surface, and covering plates 18a and 18b, comprising a plate to be broken by the pressure at bursting of the lightning arrester body 13, which closes the hole 16 of the top surface of the protective cover 15, are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lightning arrester for a vehicle such as a zinc oxide lightning arrester mounted on a vehicle such as a train.

[0002]

2. Description of the Related Art A lightning arrester for a vehicle such as a train, especially a lightning arrester mounted on a roof of a vehicle, has a surge generated when a pantograph also mounted on a vehicle roof goes up or down or takes off or takes off from a vehicle. It is used for the purpose of absorbing switching surges generated when a mounted fuse is blown, and protecting other on-vehicle equipment.

If the surge arrester for a vehicle absorbs surge energy higher than the surge arrester's performance, the internal pressure of the surge arrester will rise, and the pressure will break the surge arrester (copper thin plate) provided on the ground side of the surge arrester. In addition, the pressure generated inside the surge arrester can be released to the outside, thereby preventing explosion and scattering of the surge arrester insulator.

In order to suppress the scattering of the internal elements of the lightning arrester, the conventional lightning arrester 1 for a vehicle shown in FIGS. 3A and 3B is made of a metal or insulating covered cylindrical tube. A plurality of holes 4 and 5 are formed in the side and upper surfaces (top surfaces) of the protective cover in order to release the pressure generated from inside the lightning arrester to the outside while covering with the protective cover 3.

[0005]

However, in such a conventional lightning arrester 1 for a vehicle, copper powder and other contaminants due to sliding of the pantograph and the electric wire enter the inside of the protective cover 3 through the holes 4 and 5. Adhere to the entire lightning arrester insulator 2,
Stick. Therefore, cleaning the insulator to remove the contaminants adhered to and adhered to the lightning arrester insulator 2 requires considerable labor and time.

Accordingly, the present invention has been made in view of such circumstances, and an object of the present invention is to reduce the amount of contaminants adhering to an insulator of a lightning arrester while sufficiently maintaining the pressure release performance. An object of the present invention is to provide a lightning arrester for a vehicle that can reduce the time required for maintenance work such as cleaning.

[0007]

According to a first aspect of the present invention, there is provided a lightning arrester having an insulator tube and installed on a roof of an electric vehicle, and holes formed in a side surface and a top surface below the insulator tube. ,
A protective cover for covering the lightning arrester main body, and a cover plate made of a plate which is broken by pressure when the lightning arrester main body is released, and closing a hole on a top surface of the protective cover. I do.

According to the present invention, since the hole on the top surface of the protective cover covering the lightning arrester body is covered with the cover plate and closed, the pressure closes the top hole of the protective cover when the lightning arrester body is depressurized. As the pressure is released from the side of the protective cover,
Explosion and scattering of the surge arrester body can be prevented.

Further, since the top hole of the protective cover is closed by the cover plate, it is possible to prevent contaminants such as copper powder of the pantograph from entering the protective cover from the top hole and adhering to the insulator tube. it can.

Moreover, since the side hole is located below the porcelain tube, the amount of contaminants adhering to the porcelain tube in the protective cover through the side hole can be reduced.

Therefore, the labor required for maintenance such as cleaning for removing contaminants adhered to the insulator tube can be reduced, and the time can be shortened, while sufficiently maintaining the pressure release performance.

[0012] The invention of claim 2 is characterized in that the protective cover has two or more holes on the top surface and is opened at 1/50 or more of the surface area of the top surface.

According to the present invention, the top surface of the protective cover has two holes.
Since the openings of the lightning arrester main body are opened at a pressure of 1/50 or more and 1/50 or more of the top surface area, the pressure when the lightning arrester main body is released breaks the covering plate and is released to the outside. For this reason, the explosion and scattering of the surge arrester main body can be prevented.

The invention according to claim 3 is characterized in that the covering plate is made of an aluminum thin plate.

According to the present invention, since the covering plate is an aluminum thin plate, the same function and effect as the first or second aspect of the present invention can be obtained.

The invention according to claim 4 is characterized in that the cover plate is attached to both the inside and outside of the top surface of the protective cover.

According to the present invention, since the cover plate is attached to both inside and outside of the top surface of the protective cover, the cover plate can be prevented from falling off.

The invention according to claim 5 is characterized in that the cover plate is formed as a thin plate of any one of a metal, a nonmetal, and an insulator that is broken by the pressure when the lightning arrester body is released.

According to the present invention, substantially the same functions and effects as the invention according to any one of claims 1 to 4 can be obtained.

The invention according to claim 6 is characterized in that the cover plate is fixed to the top surface of the protective cover by a fastener such as a screw.

According to the present invention, since the cover plate is fixed to the top surface of the protective cover by fasteners such as screws, the cover plate can be securely attached to the top surface of the protective cover.
The falling off can be easily prevented.

The invention according to claim 7 is characterized in that the cover plate is made of a plate material provided with adhesiveness and waterproofness.

According to the present invention, since the cover plate exposed to the weather has adhesiveness, it is possible to improve the workability of the work of attaching the cover plate to the top surface of the protective cover and to enhance the adhesion to the top surface. Can be. Moreover, since the cover plate has waterproofness, the waterproofness of the protective cover can be enhanced, and the weather resistance of the main body of the surge arrester can be improved.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
2 will be described. In these figures, the same or corresponding parts are denoted by the same reference characters.

FIG. 1A is a plan view of a vehicle lightning arrester 11 according to a first embodiment of the present invention, and FIG.
In these figures, a vehicle lightning arrester 11 is installed together with a pantograph or the like (not shown) on a vehicle roof of a train or the like, and oxidizes in an insulator tube 12 which is an insulating container made of porcelain. The lightning arrester main body 13 is configured by incorporating a zinc element. The lightning arrester body 13 is mounted on the vehicle roof by a mounting member 14 mounted on the lower part of the insulator tube 12.

The lightning arrester body 13 is mounted on the vehicle roof with a covered cylindrical protective cover 15 made of metal, non-metal, or electric insulator.

On the top surface of the protective cover 15, two or more top holes 16 each having an area of 1/50 or more of the surface area of the top surface are formed. A plurality of side holes 17, 1 on the side surface around the tool 14
7,... Are formed at a predetermined pitch in the circumferential direction.

The inner and outer surfaces of the top surface of the protective cover 15 cover and cover the inside and outside of the top hole 16, respectively. The cover plates 18a and 18 are, for example, aluminum disc-shaped thin plates.
b is attached.

The cover plates 18a and 18b are made of metal, non-metal, or an insulator so as to be broken by the pressure of the lightning arrester main body 13 when the pressure is released and open the top surface hole 16. The used aluminum sheet for protecting the pressure-reducing membrane may be used instead. Also, the cover plates 18a,
18b is provided with adhesiveness by affixing an adhesive seal (not shown) to each inner surface which is in contact with the top surface of the protective cover 15, and is provided with waterproofness by applying a waterproof treatment such as RTV (silicon pound). The ease of attachment to the top surface of the cover 15, the adhesion, and the waterproofness can both be improved. In addition, only one of the covering plates 18a and 18b may be used.

Then, as shown in FIGS. 2A and 2B, the cover plates 18a and 18b are screwed on the top surface of the protective cover 15.
It may be fastened by 9 and 19 and fixed.

Therefore, according to this embodiment, since the top hole 16 of the protective cover 15 covering the lightning arrester main body 13 is covered by the cover plates 18a and 18b and closed, the surge arrester main body 13 should have a surge of more than performance. When the energy is absorbed, the pressure generated inside the surge arrester body 13 breaks the covering plates 18a, 18b and is quickly released to the outside, and is also released from the side holes 17, 17, ... of the protective cover 15. Therefore, it is possible to prevent the lightning arrester body 13 from being exploded and scattered.

Since the top hole 16 of the protective cover 15 is closed by the cover plates 18a and 18b, the top hole 1
6 and 16, it is possible to prevent contaminants such as copper powder of the pantograph from entering the protective cover and attaching to the insulator tube 12.

Since these side holes 17, 17,... Are located below the insulator tube 12, these side holes 17, 17,.
, The amount of contaminants adhering to the insulator tube 12 in the protective cover 15 can be reduced.

Therefore, the labor required for maintenance such as cleaning for removing contaminants attached to the insulator tube 12 can be reduced, and the time can be shortened. The effectiveness of this point has already been confirmed by field tests.

Since two or more top holes 16 of the protective cover 15 are opened and 1/50 or more of the surface area of the top surface, the pressure at the time of releasing the pressure of the surge arrester body 13 is reduced by the covering plate 18.
a and 18b are released to the outside. That is, it has pressure relief performance. For this reason, it is possible to prevent the lightning arrester main body 13 from explosion and scattering. If the opening area of the top surface hole 16 is 1/50 or less of the top surface area, the surge arrester body 13
Experiments have confirmed that the pressure at the time of pressure release cannot be released to the outside, and the arrester main body 13 may explode and scatter.

Since the cover plates 18a, 18b are securely fixed to the top surface of the protective cover 15 by the screws 19, 19, the cover plates 18a, 18b can be prevented from falling off.

Further, the coating plates 18a, 1 exposed to the weather
8b has adhesiveness, so that the covering plates 18a, 18b
The workability of the work of attaching the protective cover 15 to the top surface and the adhesion to the top surface can be improved. Moreover, since the covering plates 18a and 18b have waterproofness, the protective cover 15
Of the lightning arrester main body 13 can be improved.

[0038]

As described above, the first aspect of the present invention is:
Since the hole on the top surface of the protective cover that covers the lightning arrester body is covered with a cover plate and closed, when the lightning arrester body is depressurized, the pressure breaks the cover plate on the top hole of the protective cover and releases it to the outside. At the same time, the pressure is released from the side holes of the protective cover, so that the arrester main body can be prevented from exploding and scattering.

Further, since the top hole of the protective cover is closed by the cover plate, it is possible to prevent contaminants such as copper powder of the pantograph from entering the protective cover from the top hole and adhering to the insulator tube. it can.

Moreover, since the side holes are located below the porcelain tube, the amount of contaminants adhering to the porcelain tube inside the protective cover through the side holes can be reduced.

Therefore, the labor required for maintenance such as cleaning for removing contaminants adhered to the insulator tube can be reduced and the time can be shortened while sufficiently maintaining the pressure release performance.

According to the second aspect of the present invention, the protective cover has two or more top holes and is opened at 1/50 or more of the top surface area. Is released to the outside. For this reason, the explosion and scattering of the surge arrester main body can be prevented.

According to the third aspect of the invention, since the covering plate is a thin aluminum plate, the same operation and effect as those of the first or second aspect of the invention can be obtained.

According to the fourth aspect of the present invention, since the cover plate is attached to both the inner and outer top surfaces of the protective cover, the cover plate can be prevented from falling off.

According to the fifth aspect of the invention, substantially the same effects as those of the first to fourth aspects can be obtained.

According to the sixth aspect of the present invention, since the cover plate is fixed to the top surface of the protective cover by fasteners such as screws.
This cover plate can be securely attached to the top surface of the protective cover, and can be easily prevented from falling off.

According to the seventh aspect of the present invention, since the covering plate exposed to the wind and rain has adhesiveness, the workability of attaching the covering plate to the top surface of the protective cover and the adhesion to the top surface are improved. Can be increased. Moreover, since the cover plate has waterproofness, the waterproofness of the protective cover can be enhanced, and the weather resistance of the main body of the surge arrester can be improved.

[Brief description of the drawings]

FIG. 1A is a plan view of a lightning arrester for a vehicle according to a first embodiment of the present invention, and FIG. 1B is a partially cutaway front view of FIG. 1A.

2A is a plan view of a modification of the embodiment shown in FIG. 1, and FIG. 2B is a partially cutaway front view of FIG.

FIG. 3A is a plan view of a conventional lightning arrester for a vehicle, and FIG.
2 is a partially cutaway front view of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 vehicle lightning arrester 12 insulator tube 13 lightning arrester body 15 protective cover 16 top hole 17 side hole 18a, 18b inner and outer pair of cover plates 19 screw

Claims (7)

[Claims] An arrester main body having an insulator tube and installed on a roof of an electric vehicle; a protective cover for forming a hole in a side surface and a top surface below the insulator tube to cover the lightning arrester body; A lightning arrester for a vehicle, comprising: a plate that is broken by pressure when the lightning arrester body is released, and a cover plate that closes a hole on a top surface of the protective cover. 2. The lightning arrester for a vehicle according to claim 1, wherein two or more holes are formed on the top surface of the protective cover and at least 1/50 of the surface area of the top surface. 3. The lightning arrester for a vehicle according to claim 1, wherein the covering plate is made of an aluminum thin plate. 4. The lightning arrester for a vehicle according to claim 1, wherein the cover plate is attached to both inside and outside of the top surface of the protective cover. 5. The coating plate according to claim 1, wherein the cover plate is formed of a metal, a non-metal, or an insulator that is broken by pressure when the lightning arrester body is released. 2. The lightning arrester for vehicles according to claim 1. 6. The lightning arrester for a vehicle according to claim 1, wherein the cover plate is fixed to a top surface of the protective cover with a fastener such as a screw. 7. The lightning arrester for a vehicle according to claim 1, wherein the covering plate is made of a plate material provided with adhesiveness and waterproofness.