JPH03251009A - Gas insulated electrical equipment - 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 [Object of the Invention] (Industrial Field of Application) The present invention relates to a gas insulated electrical device in which the connection between a gas insulated transformer and a gas insulated switchgear is improved.

(Prior Art) In recent years, gas insulated transformers have been developed in which the insulating medium is an insulating gas such as SF or gas instead of oil. Therefore, a substation consisting of this gas insulated transformer and a gas insulated switchgear is being considered.

Here, the configuration of the substation will be explained using a single line diagram shown in FIG. That is, a track side line 2 and a bank side line 3 are connected to the main bus 1. The line side circuit 2 is connected from the main bus 1 side to a disconnector 4, an earthing switch 5, a current transformer 6, a circuit breaker 7, a current transformer 8, an earthing switch 9, a disconnector 10, an earthing switch 11, and A power receiving device 12 such as a bushing is provided.

On the other hand, the bank side line 3 is connected to the gas insulated switchgear 13 from the main bus 1 side. Gas insulated connection bus 14 and gas insulated transformer 15
It is equipped with The gas insulated switchgear 13 includes a disconnector 16, a grounding switch 17, a current transformer 18, a circuit breaker 19, a current transformer 20, and a grounding switch 21.

With this configuration, the gas insulated transformer 15 and the gas insulated switchgear 13 can be directly connected, and the oil-gas bushing can be omitted.

However, in this case, since the current transformer 20 is installed on the gas insulated switchgear 13 side, even if an accident occurs inside the gas insulated transformer 15 or inside the gas insulated connection bus 14, the current transformer 20 will not change. The flow vessels 20 operate without distinction. That is, it is not possible to identify the location of the accident in the current transformer 20, and it is necessary to disassemble and inspect both the gas insulated transformer 15 and the gas insulated connection bus 14.

(Problems to be Solved by the Invention) As described above, in the conventional configuration, it is not possible to determine an accident between a gas insulated transformer and a gas insulated connection bus, and a lot of time and effort are required for recovery work.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a highly reliable gas-insulated electric device that allows easy accident determination.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a current transformer is provided at the gas insulated connection bus side connection portion of the gas insulated transformer.

(Function) With this configuration, it is possible to distinguish between an accident inside the gas-insulated transformer and an accident inside the gas-insulated connection bus, and it becomes easy to deal with the accident.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

That is, as shown in FIG. 1, a container 22 filled with insulating gas is used.
A gas insulated transformer 24 housing a transformer body 23 therein is connected to a gas insulated connection bus 26 via an insulating spacer 25.

Furthermore, a gas insulated switchgear 27 consisting of a disconnector 16, a grounding switch 17, a current transformer 18, and a circuit breaker 19 is connected to the gas insulated connection bus 26, as shown in FIG.

Further, a current transformer 20 and a grounding switch 21 are disposed at a connecting portion 24a of the gas insulated transformer 24 on the gas insulated connection bus 26 side.

That is, the gas insulated transformer 24 includes a transformer main body 23, a current transformer 20, and a grounding switch 21 in the same gas compartment.

In this embodiment, the current transformer 20 is replaced by a gas insulated transformer 24.
Since the current transformer 20 is provided at the connection portion 24a of the gas insulated transformer 24, the current transformer 20 can reliably detect only an internal fault in the gas insulated transformer 24. In other words, it is possible to easily determine an accident between the gas insulated transformer 24 and the gas insulated connection bus 26. This makes it possible to disassemble and inspect only the necessary parts, thereby minimizing the time required for restoration.

Further, the connecting portion 24a is conventionally required, and
By providing the current transformer 20 and the earthing switch 21 here, the equipment can be simplified.

〔Effect of the invention〕

As explained above, in the present invention, since a current transformer is provided at the gas insulated connection bus side connection part of a gas insulated transformer, it is possible to provide a highly reliable gas insulated electrical equipment in which an accident can be easily determined. I can do it.

[Brief explanation of drawings]

Fig. 1 is a partial configuration diagram of a gas insulated electrical equipment showing an embodiment of the present invention, Fig. 2 is a single line diagram of the gas insulated electrical equipment shown in Fig. 1, and Fig. 3 is a diagram showing a conventional gas insulated electrical equipment. FIG. 1... Main busbar, 2... Track side line, 3
... Bank side line, 4... Disconnector, 5... Earthing switch, 6... Current transformer, 7... Circuit breaker,
8...Current transformer. 9...Earthing switch. 11... Earthing switch, 13... Gas insulated switchgear. 15... Gas insulated transformer, 17... Earthing switch, 19... Circuit breaker, 21... Earthing switch, 23... Transformer main body. 24a... Connection portion, 26... Gas insulated connection busbar, 10... Disconnector, 12... Power receiving device, 14... Gas insulated connection busbar, 16... Disconnector, 18...・Current transformer, 20...Current transformer. 22... Container, 24... Gas insulated transformer, 25... Insulating spacer, 27... Gas insulated switchgear.

Claims (1)

[Claims] A gas insulated switchgear having a circuit breaker and a gas insulated transformer are connected by a gas insulated connection bus bar, and a current transformer is disposed between the circuit breaker and the gas insulated transformer, wherein the gas insulated transformer A gas insulated electric device, wherein the current transformer is provided at the gas insulated connection bus side connection portion of the device.