JPS6261220A - Gas breaker with arrestor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a surge arrester gas circuit breaker constructed by connecting a lightning arrester 12 to a grounded tank type gas circuit breaker.

[Background of the invention]

Generally, preservation devices are used to protect equipment from lightning strikes on power lines.

A fear gap 1 shown in FIG. 2 is known as a conventional protection device. This rod gap 1 is connected in parallel with a support insulator 21 used for holding down the power transmission line 2 in the vicinity of the power transmission line side lead-in tower side for holding down the power transmission line 2 . When the power transmission line 2 is struck by lightning, the gas circuit breaker 3 is protected by discharging the shield gap 1.

However, the discharge characteristics of this rod gap 1 varied depending on weather conditions, and high reliability could not be obtained.

Therefore, as shown in Figure 3, a separate
started to be used. However, this chair type lightning arrester also
There was a drawback that the insulator tube was contaminated by salt, dust, etc. and the discharge characteristics changed.

In order to address these shortcomings, for example, as shown in Japanese Unexamined Patent Publication No. 60-2007, a tank-type lightning arrester is constructed in a sealed metal container, and this is replaced with a gas circuit breaker. had to be connected to. For this reason, the gas circuit breaker with lightning arrester becomes very expensive and requires a large installation space.

[Purpose of the invention]

An object of the present invention is to provide a gas circuit breaker with a lightning arrester that can be configured in a small installation space and has stable discharge characteristics.

[Summary of the invention]

The present invention is characterized in that a lightning arrester is housed in one axial end of a sealed container in a gas circuit breaker.

[Embodiments of the invention]

Hereinafter, a first embodiment of a gas circuit breaker with a lightning arrester according to an embodiment of the present invention will be described.
This will be explained using figures.

At both axial ends of the cylindrical closed container 5 that extends substantially linearly, external outlet ports that extend substantially radially are formed. In this embodiment, the bushings 6 are connected to the extensions of the external outlet, but in other examples, the cass insulation busbars are connected.

In the figure, the center conductor 11 of the bushing 6 on the right side is electrically connected to the movable element side conductor 17 via a current collector 12. The movable element side conductor 17 is electrically insulated and fixed from the closed container 5 by the insulating tube 15. An insulating rod 16 is disposed within the insulating tube 15 and the movable element side conductor 17. One end of the insulating rod 16 is connected to the operating device 18 and the other end is connected to the movable contact 14.

This movable contactor 14 is electrically connected to the center conductor 11 of the bushing 6.

On the other hand, the center conductor 7 of the left bushing 6 is connected via the current collector 9 to the stator side conductor 13 . This stator side conductor 13 is fixed to the closed container 5 by an insulating cylinder 8 in a state of being blood- and gas-insulated. One end of the insulating tube 8 is hermetically sealed by the stator side conductor 13 via an airtight retaining member 21 such as a gasket, and the other end of the insulating tube 8 is sealed with the end cover 22 and the m-tube via an airtight retaining member. It is hermetically sealed by a cover 26. The end cover can be removed from the closed container 5, and the lightning arrester cover 26 can be removed from the end cover 4. In this way, both ends of the insulating cylinder 8 are hermetically sealed, and a lightning arrester 19 consisting of a stack of lightning arrester elements is constructed coaxially therein, one end of which is connected to the stator side conductor 13, and the other end of which is connected to the stator side conductor 13. It is electrically connected to the closed container 5.

Therefore, the fixed contact 10 fixed to the right side of the stator side conductor 13 is fixed via the insulating tube 8 at a position where it can come into contact with the movable contact 14. That is, this insulating tube 8 is an insulator for supporting a fixed contact in a generally known buffer type gas circuit breaker, and in this embodiment, it also serves as an insulating tube for accommodating a lightning arrester 19.

The inside of the insulating cylinder 8 is filled with insulating gas, which is completely passed through a valve n provided through a canopy cover 26. On the other hand, the inside of the closed container 5 surrounding the insulating cylinder 8 is filled with an insulating gas via a valve passage.

Now, if a surge voltage occurs due to wealth, the ground fault will be released.
The passage includes a central conductor 7...a current collector 9...
Stator side conductor 13... Lightning arrester 19...
From the airtight container 5 to the earth.

Even if the lightning arrester 19 is damaged, the insulating gas in the insulating tube 8 can be recovered from the valve N, and the lightning arrester cover can be removed and replaced, so the insulating gas in the sealed container 5 can be recovered unnecessarily. You can work in one hour without any hassle.

In this embodiment, the mu is arranged in the axial direction of the closed container 5.

Since the insulating cylinder 8 for supporting the fixed contact 10 is used, a gas circuit breaker with a lightning arrester can be obtained with a reduced number of parts.

In addition, in a typical gas circuit breaker, a dead space is formed in the sealed container 5 near the external outlet of the sealed container 5, that is, the connection part with the bushing 6, but this space can be used to configure a lightning arrester. Therefore, the installation space can be reduced, and since the lightning arrester 19 is in the form of a tank constructed within the sealed container 5, stable discharge characteristics can be obtained.

In the above embodiment, the lightning arrester 19 was constructed in the insulating tube 8 arranged in the axial direction of the closed container 5, but an insulating tube was arranged in the radial direction of the closed container 5 in the vicinity of the center conductor 7 to connect the fixed contact 10. The averter 19 may be configured within this insulating cylinder by supporting and fixing it. Further, in the above embodiment, a gas circuit breaker with one breaking point was explained, but in the case of a gas circuit breaker with multiple breaking points, insulators for supporting fixed contacts are provided at both ends of the closed container 5, so in this case, a lightning arrester is installed at either end. can be configured.

〔Effect of the invention〕

As explained above, the present invention configures a lightning arrester by utilizing the dead space formed in the vicinity of the external outlet in the closed container housing the interrupter, so that it is not necessary to increase the size of the gas circuit breaker or increase the installation space. Therefore, it is possible to obtain a scum breaker with a surge arrester with stable discharge characteristics.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional front view of a gas circuit breaker with a lightning arrester according to an embodiment of the present invention, and FIGS. 2 and 3 are front views showing the connection structure of a conventional lightning arrester and a gas circuit breaker. 5... Closed container, 6... Bushing,
7... Center conductor, 8... Insulating tube, 10
...Fixed contact, 14... Movable contact, 19... Lightning arrester, 20.21... Airtight maintenance member, n... A quick look, 5...Surge arrester cover, n...Valve. Shicho-no 5 Mi:;-1

Claims (1)

[Claims] 1. A cut-off part is constructed in a closed container filled with an insulating gas, a fixed contact of the cut-off part is fixed to the closed container via an insulating cylinder, and both ends of the cut-off part are A gas circuit breaker led out from an external outlet bent in a substantially radial direction at both ends of the sealed container, and a lightning arrester having one end electrically connected to a fixed contact of the gas circuit breaker, the external outlet A gas circuit breaker with a lightning arrester, characterized in that the lightning arrester is arranged in the airtight container in the vicinity. 2. The gas with lightning arrester according to claim 1, wherein the insulating tube has a sealed structure in which both ends are hermetically sealed, and the lightning arrester is housed within the insulating tube. circuit breaker.