JPH04178103A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To interrupt surge coming from the main bus in operation by opening an externally drivable disconnector connected between the branch points of gas insulated switchgear which are connected to the respective buses through respective disconnectors. CONSTITUTION:A gas insulated switchgear is connected through a circuit breaker 1 with an external circuit (not shown) and main buses 5, 6 are connected through disconnectors 7, 8 with respective branch points 3, 4 of an internal connecting conductor 2. Furthermore, an externally drivable disconnector 10 is connected between the branch points 3, 4. When external circuits following to the circuit breaker 1 are extended or modified, the main bus 5 close to the circuit breaker 1 is stopped while the main bus 6 remote from the circuit breaker 1 is operated and the disconnector 10 is opened along with the disconnector 8. Consequently, the main bus 6 and the circuit breaker 1 are opened electrically at two points and an excessive surge occurring on the main bus 6 is blocked from entering into the circuit breaker 1 side thus making it possible to perform work safely in the downstream of the circuit breaker 1.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a gas-insulated switchgear, in particular, a disconnector which can be driven externally between branch points of connection conductors that branch to each main bus bar via each disconnector. The present invention relates to a gas insulated switchgear having a section.

[Conventional technology]

FIG. 2 is a schematic configuration diagram showing a conventional gas insulated switchgear disclosed in, for example, Japanese Patent Publication No. 62-59521. In FIG. 6, (1) is a circuit breaker, and (2) is this circuit breaker
The connecting conductor connected to [31Hl is this connecting conductor f2
1, (51f61 is the main bus line forming the 2 main bus lines, (71f81 is the main ffl line [51f
61 and each branch point (3)i, 4J.

The conventional gas insulated switchgear is configured as described above, and connects each main bus f5] f61 to an external circuit (not shown) via each disconnector (71 (81), connection conductor (2) and circuit breaker (1)). When installing such a gas-insulated switchgear, from the perspective of reducing the initial investment, it is common practice to invest in and install only the bus-side disconnector section first, and then install the circuit breaker section and subsequent sections in the future. In this case, the main bus 151 on the side closer to the circuit breaker (1) is stopped, and the main bus line (6) on the side far from the circuit breaker (1) is switched off while it is in operation. (8) is opened and expanded.

[Problem to be solved by the invention]

Since the conventional gas insulated switchgear is configured and expanded as described above, the electrical disconnection between the main bus (6) and the circuit breaker (1) during operation is made at one point only by the disconnector (a). However, if an excessive surge voltage were to enter the main bus (6) side, there was a problem in that there was a risk that it would also propagate to the circuit breaker (1) side to be added.

This invention was made to solve the above-mentioned problems, so even if an excessive surge voltage enters the main bus bar side during operation, there is no risk of it propagating to the added circuit breaker side. The purpose is to obtain a device.

[Means to solve the problem]

The gas insulated switchgear according to the first aspect of the present invention is provided with a disconnecting section that can be driven from the outside between the branch points of the connecting conductor that branch to the respective disconnecting switch sides.

[Effect]

The disconnecting section of the gas insulated switchgear according to the present invention opens together with the disconnecting switch on the main bus side in the operating state, and opens two or more electrical points between the main R line and the circuit breaker.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a schematic configuration diagram showing a gas insulated switchgear according to an embodiment of the second invention. In fig.

Circuit breaker (1), connection conductor (2), branch point f31 +4+
, main busbar (town (6) and disconnector (7) (8 is the same as the conventional one in Fig. 2, so the explanation will be omitted. (1)
0) is a disconnector as a disconnector connected between both branch points (31(4)) of the connecting conductor fil, and is opened and closed by being driven from the outside by, for example, an air cylinder (not shown).

In the gas insulated switchgear according to an embodiment of the present invention configured as described above, the circuit breaker (
When adding 1) or later, first stop the main bus (51) on the side closer to the circuit breaker (1), and disconnect the main bus (6) on the side far from the circuit breaker (1) while it is in operation. The disconnector (S) is opened, and the disconnector (10) is also opened at the same time.

By opening this disconnector (10), there are two electrical open points between the main bus (6) and the circuit breaker (1), and the main bus (6) is opened.
Even if an excessive surge voltage enters the ) side, there is no fear of it propagating to the additional circuit breaker (1) side.

In the above embodiment, a disconnector (10) as a disconnector is connected between the two branch points (3) and (4), but other switchgear such as a circuit breaker may also be connected. There are also two prongs that produce the same effect when connected, Ur#
If you install the I device (10) in multiple locations and open multiple points,
Even more safety than the two-point open case in one embodiment.
Needless to say, it will be preserved.

〔Effect of the invention〕

As described above, according to the present invention, a disconnecting section that can be driven from the outside is provided between the branch points of the connecting conductor branching to each disconnecting switch side, so that excessive surge voltage does not enter the main bus side during operation. However, it is possible to obtain a gas-insulated switchgear without the risk of propagation to the added circuit breaker.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a gas insulated switchgear according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a conventional gas insulated switchgear. In the figure, (1) is the circuit breaker, (2) is the connecting conductor, and (3
1f4.1 is the branch point, (51 (61 is the main a-line, (71
[8) 4. : Disconnector, (lO) C is a disconnector as a disconnector. Note that the same reference numerals in each figure indicate the same or corresponding parts. l Arrest line f6 41 lines of 7th line 7θ, to road base J, 40 minutes A, 9

Claims (1)

[Claims] In a gas-insulated switchgear having a connecting conductor and a circuit breaker connected to each main bus bar via each disconnector provided branching off from the branching point of the connecting conductor, an externally driven circuit is provided between the branching points of the connecting conductor. A gas insulated switchgear characterized by being provided with a disconnecting section that can be disconnected.