JP2601169Y2 - Gas insulated switchgear - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear which is reduced in size by reducing the number of components.

[0002]

2. Description of the Related Art In general, a gas-insulated switchgear for receiving power uses a cable lead-in system, and is configured as shown in FIG. The figure is shown as a single line,
Is a housing for housing the equipment, 2 is a power bus, 3 is a circuit breaker, 4
Is a cable, 5 is a cable head, 6 is an arrester, 7 is a switch for grounding, 8 and 9 are disconnectors with a grounding device, 10, 1
1 is an insulating spacer, and 12 is a plug. As shown
The grounding of the switch 7 and the grounding of the lightning arrester 6 are both performed outside the housing 1 via insulating spacers 10 and 11.

[0003]

However, since the grounding device and the lightning arrestor are separately provided, there is a limit to miniaturization of the gas insulated switchgear. On the other hand, a plug is necessary only for performing a withstand voltage test, which is a test of a cable and a panel, for separating the lightning arrester from the main circuit, but is usually unnecessary at all. In addition, the number of parts of the gas-insulated switchgear increases because the plugs that are not normally required are provided.

Accordingly, an object of the present invention is to provide a gas insulated switchgear which solves the above problem.

[0005]

According to the present invention, there is provided a circuit breaker interposed between a power supply bus and a cable, and a breaker connected between the circuit breaker and the cable. In a gas-insulated switchgear composed of an arrester, grounding means connected between a breaker and a cable via a switch, and a housing for accommodating the breaker, etc., one of the plug-in mechanisms A plug is attached to the housing and one of the plugs is connected between the circuit breaker and the cable via the switch, and grounding means having the other plug and lightning arrester means having the other plug connected to the lightning arrester are provided. It is provided separately, and the other plug of the grounding means or the lightning arrester means can be selectively connected to one plug from outside the housing.

[0006]

When conducting the withstand voltage test, the test is performed without connecting the grounding means and the lightning arrester means. For normal use as a gas insulated switchgear, lightning arrester means is connected from outside the housing by coupling one plug to the other plug. Next, when performing maintenance or inspection of the gas insulated switchgear from a normal state in which the lightning arrester means is connected, a power failure is confirmed after the circuit breaker is shut off, and the lightning arrester means is removed after the switchgear is opened. Then, by connecting one plug to the other plug, grounding means is connected from outside the housing. Thereafter, the switch is closed to ground the main circuit closer to the cable than the circuit breaker, thereby preventing an electric shock accident inside the housing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. In this embodiment, since a part of the conventional gas insulated switchgear is improved, the same parts as those of the prior art are denoted by the same reference numerals, and the description thereof will be omitted.

The configuration of the gas insulated switchgear according to the present invention is as follows:
As shown in FIG. As can be seen from a comparison with FIG. On the other hand, the spacer 10 for grounding is also removed, and one plug 13a constituting a plug-in mechanism is attached to the housing 1 instead of the spacer 10, and the plug 13a is connected to the cable 4 and the circuit breaker through the switch 7. 3 are connected.

The grounding means 1 and the lightning arrester means 15 having the lightning arrestor 6 can be selectively connected from outside the housing 1 to ground.
4 is provided with the other plug 13b,
Is also connected to the other plug 13b.

Next, the operation of the gas insulated switchgear will be described. The withstand voltage test is performed without connecting the grounding means 14 and the arrester means 15 to the gas-insulated switchgear. In order to use the gas-insulated switchgear originally, the lightning arrester means 15 is connected from the outside of the housing 1 by connecting one plug 13a to the other plug 13b. Next, when performing maintenance and inspection of the gas insulated switchgear from the normal state to which the lightning arrester means 15 is connected, the power failure is confirmed after the circuit breaker 3 is shut off, and the lightning arrester means is opened after the switchgear 7 is opened. 15 is removed. Then, by connecting one plug 13a to the other plug 13b, the grounding means 14 is connected from outside the housing 1. Thereafter, the switch 7 is closed to ground the main circuit closer to the cable 4 than the circuit breaker 3 to prevent an electric shock accident inside the housing 1. As described above, the switch 7 can be used as a switch for grounding, or as a switch for releasing the lightning arrester 6, and the switch 7 can be used as two types of components.

[0011]

As can be seen from the above description, according to the gas insulated switchgear of the present invention, the lightning arrester housed in the housing is conventionally detachably connected to the outside of the housing. The switchgear can be miniaturized, and even if a failure occurs in the lightning arrester, the lightning arrester can be easily replaced because it is arranged outside the housing. Further, since there is no plug for a lightning arrestor which is unnecessary in a normal use state, the number of components is reduced as compared with the conventional case, and reliability can be improved, and an inexpensive gas insulated switchgear can be provided.

[Brief description of the drawings]

FIG. 1 is a connection diagram showing an embodiment of a gas-insulated switchgear according to the present invention.

FIG. 2 is a connection diagram of a conventional gas insulated switchgear.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 2 ... Power supply bus 3 ... Circuit breaker 4 ... Cable 6 ... Lightning arrester 7 ... Switch 13a ... One plug 13b ... The other plug 14 ... Grounding means 15 ... Lightning arrestor means

Claims (1)

(57) [Scope of request for utility model registration] 1. A circuit breaker interposed between a power supply bus and a cable, an arrester connected so as to be disconnectable between the circuit breaker and the cable, and a switch between the circuit breaker and the cable via a switch. In a gas insulated switchgear comprising a grounding means to be provided and a housing for accommodating a circuit breaker, etc., one plug constituting a plug-in mechanism is attached to the housing and the other plug is connected via the switch. And grounding means having the other plug connected to the circuit breaker and the cable, and lightning arrester means having the other plug connected to the lightning arrester are separately provided. A gas insulated switchgear, characterized in that it can be selectively connected to one of the plugs from outside.