JPS59175313A - 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 The present invention relates to a gas insulated switchgear, and more particularly to a voltage detection device for a gas insulated switchgear blocked by a ground potential container.

An example of a conventional gas insulated switchgear is shown in Fig. 1, which shows one power receiving and transmitting circuit.

A disconnect switch equipped with an earthing switch 3 is introduced into the gas-insulated container λ to which the power receiving cable l is attached, and a passage is introduced into the container λ having a ground potential by the power receiving cable l, and the conductor S
The circuit breaker 6 connects to the disconnector 9 with a conductor 10, and then the conductor 7 connects the circuit breaker 6 to the disconnector 9 equipped with a grounding switch g. /, 2
It is connected to other lines. Here, in a gas-insulated switchgear in which no live parts are exposed, the grounding switch 3 is electrically insulated from the container at ground potential in an open circuit state, and the cable 13 and the sealed terminal/
4, it is drawn out from the insulating gas into the atmosphere (into the air), and is connected to the container via the ground wire /A-, and then connected to the ground potential.

The operation for grounding the main circuit is carried out by connecting the fixed contact 17 from the outside of the container by rotating the cover clockwise in the figure. The symbol Noza is an insulating gas sealed in a container, /? indicates the air control section.

Since the conventional gas insulated switchgear has the above-mentioned 5 configurations, when a power outage occurs during inspection of the 5 devices, it is necessary to turn on the grounding switch and discharge the power to ensure work safety.

However, if the circuit is turned on while it is charging, it will cause a serious accident of three-phase short circuit, so to confirm that it is not charging, disconnect the ground wire /3 and connect the sealed terminal /4tK voltage detector. The judgment was made by detecting the stray current between the movable contact /A and the fixed contact 17 of the earthing switch.

In this way, in order to operate (turn on) the earthing switch, it is necessary to attach and remove the grounding wire/S each time, which makes the work complicated and also prevents accidents in the unlikely event that the earthing switch is being turned on. In preparation for the accident, it was necessary to conduct a large current due to an accident, so there was a drawback that a fairly large grounding wire IS, a conductor /3, and 7 sealed terminals were required.

This invention was made in view of the above-mentioned drawbacks of conventional devices, and the purpose of this invention is to provide a gas-insulated switchgear that does not have the above-mentioned drawbacks and can easily perform voltage detection work. A movable contact electrically insulated from the potential container is provided, fixed contacts that can be connected to and separated from the movable contact are provided on the main circuit side and on the ground potential side, respectively, and a grounding switch is housed to store the potential of the movable contact. The present invention provides a gas insulated switchgear characterized by being equipped with a conductor such as a control cable that leads out of the gas insulated container.

The invention will now be described in detail with reference to the illustrated embodiments.

As shown in FIG. 2, in the present invention, a movable contact 22 electrically insulated from a container at ground potential is provided in the earthing switch 3/, , r/ of the gas insulated switchgear. , 2.2, a movable contact and a fixed contact (7.2/ that engages with the movable contact by clockwise rotation of 22) are provided on the main circuit side and the ground potential side, respectively, and a movable contact is also provided. Cable, 23, sealed terminal 2' for drawing out the potential to the outside air of the container (into the air)
The structure differs from the one shown in FIG. 1 in that 1 is connected to a movable contact 2-, but other parts are the same as the conventional gas insulated switchgear shown in FIG. Therefore, the same or equivalent members are denoted by the same reference numerals, and the description thereof will be omitted. That is, FIG. 2 also shows one line segment of the power receiving and transmitting circuit. For example, in the case of the power receiving line, the current path is introduced into the gas-insulated container λ with the power receiving cable /, connected to the disconnector DA with the conductor S, Furthermore, conductor 7
After passing through the circuit breaker 6, the conductor 10 connects to the circuit breaker 6, and then to the bus line 1, where it is connected to other lines.

According to this invention, a voltage detector can be directly connected to the sealed terminal 2 for voltage detection when operating the earthing switch. In addition, in the event of an accidental current during power-on, the ground potential side fixed contact, 2
/, so the cable 23 and the two sealed terminals only need to carry a very small stray current between the movable contact and the fixed contact, and do not require a large capacity.

As configured as above, according to this invention,
At the same time, it is easy to carry out voltage inspection when operating the earthing switch.
The sealed terminal and cable need only have a small current carrying capacity, making it economical. It also makes cable wiring easier,
This also has the effect of eliminating the need for a grounding wire.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the structure of a conventional gas insulated switchgear, and FIG. 2 is a sectional view showing an embodiment of the gas insulated switchgear of the present invention. /...Power receiving cable, co...$5.3. j, g. g′...Earthing switch, ri?・・Disconnector, 3.7゜10
, //... Conductor, 6... Breaker, /, 1... Bus bar, 1
3...cable, //%...sealed terminal, /ri...ground wire, /A, uλ...movable contact, /7...main circuit fixed contact, 2/...ground side fixed contact, 23...
Cable 1.2<4... Sealed terminal. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno −

Claims (1)

[Claims] A movable contact provided on the movable side of the earthing switch and electrically insulated from the container at ground potential, and a fixed contact provided on the main circuit side and the ground potential side so as to be able to connect and separate from this movable contact. A gas insulated switchgear comprising: a conductor such as a control cable for guiding the potential of the movable contact to the outside of a gas insulated container housing the grounding switch.