JPS60237808A - Gas insulated switching device - 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 [Technical Field of the Invention] The present invention relates to a gas insulated switchgear, and particularly to the reduction of its gas monitoring device.

[Prior art]

FIG. 1 is a structural explanatory diagram of a conventional gas insulated switchgear, which is a single-bus type gas insulated switchgear.

Busbar, bus disconnector 3. Tweeter disconnector Hiroshi, breaker 5
．． It is composed of a cable head 6, a metal container 7, etc.

Inside the metal container 7, the bus bar, the bus disconnector 3, the feeder disconnector, and the cable head 6 are separated by an insulating spacer g. Further, the feeder disconnector 6, the cable head 6, and the breaker S are separated by an insulating spacer 10. In this way, there is an insulating spacer inside the metal container 7.
9. It is divided into three rooms: a busbar room //, a feeder room/2, and a breaker room 13 at lθ. And the busbar room//
.

The feeder chamber 1 and the breaker chamber 3 are each sealed with an insulating gas such as SF'A (sulfur hexafluoride) gas G at a predetermined pressure.

Gas monitoring devices /'I, /J, 16 each equipped with a pressure gauge, a temperature compensation pressure switch, etc. are installed in the busbar room//, the feeder room 12, and the breaker room 13. Q, /, /& for each room //, /, 2
．． The state of SFz gas G within /3 is normally monitored. If SF6 gas G leaks into the atmosphere, the gas monitoring device/IT is designed to issue an alarm. The setting of the gas pressure in the busbar chamber 77 is determined mainly from the viewpoint of the insulation of the busbar 2° busbar disconnector 3.

The setting of the gas pressure in the feeder chamber 7.2 is determined primarily by the insulation properties of the feeder disconnector. Also,
Breaker room/? The setting of the gas pressure inside the breaker is mainly determined from both the insulation and breaking properties of the breaker. Generally, the same gas pressure is set in the busbar chamber // and in the feeder chamber 7.2, and the gas pressure in the breaker chamber /3 is the same as that in the busbar chamber // and in the feeder chamber. It is set to a value higher than /2.

The power of the gas insulated switchgear l configured as described above is transferred to the load side (not shown) via the bus bar Co → bus disconnector 3 → 1u and the disconnector S → feeder disconnector Doug cable head. Supplied.

By the way, the conventional gas insulated switchgear l has a busbar chamber/l.
, feeder room/, 2 and breaker room 13, each room/l
In order to minimize accidents caused by gas leaks in the , /ko, and /3, expensive gas monitoring devices are installed in each of them, which increases production costs and makes it difficult to maintain and inspect the gas monitoring devices. The disadvantage was that it was time-consuming.

[Summary of the invention]

This invention was made with the aim of eliminating the above-mentioned drawbacks.The invention connects chambers having the same gas pressure with each other via a communicating pipe through a valve, and installs a gas monitoring device in each chamber having the same gas pressure. The present invention provides a gas insulated switchgear that can reduce the need for expensive gas monitoring equipment by attaching a set of gas monitoring equipment, and eases the need for gas management, maintenance and inspection of the gas monitoring equipment, etc.

[Embodiments of the invention]

Hereinafter, a second embodiment of the gas insulated switchgear of the present invention will be described.
This will be explained using figures. FIG. 2 is a structural explanatory diagram showing one embodiment of the present invention, and the same or corresponding parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted. The bus chamber l/ and the feeder chamber /2 are connected by a gas pipe /7 as a communication pipe.

This gas pipe/7 is provided with a throttle valve 7K. This throttle valve /g is in the shape of a pipe with a small inner diameter, and even if the decomposed gas and foreign matter in the busbar chamber // and feeder chamber /λ move between them, the amount will be limited to the busbar chamber. //, the feeder chamber is in such a state that it does not cause any problems. In addition, l? is a gate valve, which is required when inspecting or replacing the throttle valve/g.

In the gas insulated switchgear l configured as described above, if the gas pressure in the feeder chamber 12 should drop, the feeder chamber 12 will be communicated with the busbar chamber l/ via the throttle valve /S. Therefore, the gas monitoring device/da installed in @line room l/ detects the gas, and there is no need to take the trouble of installing a gas monitoring device for the feeder room 12.

In addition, when an accident occurs in busbar chamber 1, the movement of decomposed gas, foreign matter, etc. to feeder chamber 1 is controlled by a throttle valve /I, and the amount of movement is such that it will interfere with feeder chamber 2. It's not a thing. On the other hand, the movement of decomposed gas, foreign matter, etc. to the bus room 11 when an accident occurs in the feeder room 11 does not pose a problem to the bus room 11, as described above.

In addition, in the above embodiment, a gas monitoring device /l' is installed in the busbar room /l.
This gas monitoring device/F was installed in the feeder chamber 7.
The gas monitoring device /'f may be attached to the gas monitoring device /'f to monitor the gas conditions in both the busbar chamber // and the feeder chamber l.

In addition, in the above embodiment, a single-bus type gas-insulated switchgear/
Although the case has been explained above, it may also be a case of a double busbar system, but in this case, the added busbar chamber and feeder chamber lλ are connected to the throttle valve/1 as in the above embodiment.
If a gas monitoring device/Hiro is attached to the feeder chamber, the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As explained above, the gas insulated switchgear of the present invention has a simple configuration in which a set of gas monitoring devices can be installed in one room by connecting valves between chambers having the same gas pressure, thereby eliminating the need for expensive gas monitoring devices. This has the effect of reducing gas management, maintenance and inspection of gas monitoring equipment, etc.

[Brief explanation of the drawing]

FIG. 1 is a structural explanatory diagram of a conventional gas insulated switchgear, and FIG. 2 is a structural explanatory diagram showing an embodiment of the present invention. /...Gas insulated switchgear, Co.-Bus bar, 3.Bus disconnect switch, Hiro...Feeder disconnect switch, 6.Cable head, l
tlde, / 0 ”Insulation sveta, //・Kaoru busbar room,
/2-' feeder room, /3... breaker room, /Hiroshi, is
, ib-fist gas monitoring device, /7...Gas piping (communicating pipe)
,/za...throttle valve, G...insulating gas. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] (1) In a gas insulated switchgear in which a plurality of chambers are each filled with an insulating gas, the chambers having the same gas pressure are connected to each other by a communicating pipe via a valve, A gas insulated switchgear characterized in that a set of gas monitoring devices is installed in one of the chambers having the same gas pressure. (,2) The gas insulated switchgear according to claim 1, wherein the valve is a throttle valve. (3) The communication pipe includes a busbar, a busbar room having a busbar disconnector,
The gas insulated switchgear according to claim 1 or 2, which connects a feeder disconnector and a feeder chamber having a cable head.