JPH0614423A - Sf6 gas insulated switchgear - Google Patents

Abstract

PURPOSE:To improve the efficiency of direct current withstand voltage tests for lead-in cables by pressurizing and circulating SF6 gas with metal pieces removed. CONSTITUTION:SF6 gas is blown off through gas blowoff ports 5 located at the upper part of a gas insulated switching section 21. SF6 gas is taken in through gas inlet ports 10 located at the lower part of the gas insulated switching section 21. The inlet ports 10 are connected to a vacuum tank 13 through pipes 11, and the connections of the tank 13 are provided with filters 12. The gas blowoff ports 5 are connected to a high pressure tank 2 through a pipe 3. One port of a gas pump 15 is connected to the high pressure tank 2; the other port thereof is connected to the vacuum tank 13. SF6 is thereby pressurized and circulated. In this case metal pieces contained in SF6 gas are removed by the filter 12, and SF6 gas only is introduced into the vacuum tank 13. This improves the efficiency of direct current withstand voltage tests for lead-in cables.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to high pressure sulfur hexafluoride (SF
SF _{to 6)} air outlet of the gas blown SF ₆ gas, to remove the metal piece produced from the movable portion and the contact portion of the disconnector and grounding devices in inlet SF ₆ gas insulated switchgear by sucking SF ₆ gas from ₆ Gas-insulated switchgear.

[0002]

BACKGROUND ART SF ₆ gas insulated switchgear except SF ₆ gas of the cable head portion when performing the DC withstand voltage test of the drop cable of the connected power company to the cable head and SF
_{6 It} was necessary to remove the rod that connects the conductor inside the gas-insulated switchgear, resulting in inefficient operation.

[0003]

The object of the present invention is SF ₆
To provide an efficient perform such SF ₆ gas insulated switchgear DC withstand voltage test of the incoming cable by eliminating the need for gas processing caused by removing SF ₆ gas in the gas insulated switchgear.

[0004]

SUMMARY OF THE INVENTION The present invention is installed and the gas-insulated switchgear unit which filled the SF ₆ gas and housing the main circuit disconnector or a grounding switch device, the upper part of the gas-insulated switchgear unit SF ₆ A gas outlet that blows out gas, a gas inlet that is installed at the bottom of the gas-insulated switchgear and that sucks SF ₆ gas, and a vacuum tank that is connected to this inlet through a suction gas pipe and has a filter attached to the connection part. , a high-pressure gas tank which is connected via a gas pipe blowing the air outlet, is connected one to the high-pressure gas tank, formed by including a gas pump for circulating by boosting the SF ₆ gas is connected to a vacuum tank, a the other SF ₆ gas insulated switchgear.

[0005]

In the SF ₆ gas insulated switchgear of the present invention,
The main circuit disconnector or ground switchgear is housed in the gas-insulated switchgear to fill SF ₆ gas, and a gas outlet is installed above the gas-insulated switchgear to blow out SF ₆ gas and A gas suction port is installed at the bottom, SF ₆ gas is sucked in, a vacuum tank is connected to the suction port via a suction gas pipe, a filter is attached to the connection part, and a high pressure gas tank is connected to the blowout gas pipe via a blowing gas pipe. Then, one of the gas pumps is connected to a high-pressure gas tank, the other is connected to a vacuum tank, and the SF ₆ gas is pressurized and circulated.

[0006]

EXAMPLE An example of the present invention will be described below. In FIG. 1, reference numeral 21 is a gas-insulated opening / closing section that accommodates the disconnecting switch 6 or the ground switchgear 7 and is filled with SF ₆ gas, and 5 is a gas outlet that is installed above the gas-insulating opening / closing section 21 and blows out SF ₆ gas. Numeral 10 is a gas suction port that is installed below the gas-insulated opening / closing section 21 and sucks SF ₆ gas. Reference numeral 2 is a high-pressure gas tank connected to the outlet 5 through a gas pipe 3 for blowing, 15 is a gas connected to the high-pressure gas tank 2 on one side and a vacuum tank 13 on the other side, and is a gas for pressurizing and circulating SF ₆ gas. A compressor, which is used in the SF ₆ gas insulated switchgear, and is used as a power receiving disconnector and grounding switchgear 7, a gas outlet 5 incorporated in the power receiving disconnector 6 and a grounding switch 7, and a suction port. Outlet 10, gas outlet 5 and gas pipe 3
The high pressure gas tank 1 connected by, the gas suction port 10 and the filter 12 connected by the gas pipe 11, the vacuum tank 13, and the SF ₆ gas in the vacuum tank 13 which is connected by the pipe to the vacuum tank 13 and the high pressure gas tank 2. Is an SF ₆ gas insulated switchgear comprising a compressor for evacuating and charging the high-pressure gas tank 2 and a valve provided in each pipe.

That is, in this embodiment, the gas outlet 5 incorporated in the gas insulated switchgear, the gas outlet 5 for ejecting the metal piece in the gas insulated switchgear together with SF ₆ gas, and the SF
A high pressure gas tank 2 to supply ₆ gas, and blown vacuum tank 13 the SF ₆ gas, a filter 12 for filtering metal pieces exiting with SF ₆ gas, remove the SF ₆ gas entering the vacuum tank 13, a SF ₆ gas insulated switchgear comprising a compressor 15 to plenum the SF ₆ gas in high-pressure gas tank 2, a high-pressure gas tank 2 filled with SF ₆ gas 1, from the high-pressure gas tank 2 via a gas pipe 3 gas insulated switchgear 4, a gas outlet 5 incorporated in 4, gas pieces produced from the SF ₆ gas and the disconnecting switch 6 and the movable part 8 and the connecting part 9 of the grounding switchgear 7 are connected to the gas inlet 11
To release.

The SF ₆ gas and the metal piece are filtered by the filter 12 connected to the gas pipe 11, and only the SF ₆ gas 1 flows into the vacuum tank 13.

The SF ₆ gas 1 flowing into the vacuum tank 13 is sent to a compressor 15 via a gas pipe 14 connected to the vacuum tank 13, and the compressor 15 evacuates the vacuum tank 13 and returns the SF ₆ gas to the high pressure gas tank 2 again. 1 shows an SF ₆ gas insulated switchgear 4 comprising a device filled with ₆ gas 1.

[0010]

According to the present invention, in order to remove the rod in the cable head portion of the SF ₆ gas insulated switchgear, the DC withstand voltage test of the incoming cable can be carried out without releasing the SF ₆ gas in the cable head portion to the atmosphere. This enables efficient operation.

[Brief description of drawings]

FIG. 1 is a structural diagram of an SF6 gas insulated switchgear showing an embodiment of the present invention.

[Explanation of symbols]

 2 High-pressure gas tank 5 Gas outlet 10 Gas inlet 12 Filter 13 Vacuum tank 15 Compressor

Claims (1)

[Claims] 1. A gas-insulated switch which is filled with sulfur hexafluoride gas and accommodates a main circuit disconnector or a ground switch, and the sulfur hexafluoride gas is blown out by being installed above the gas-insulated switch. A gas outlet, a gas inlet installed at the lower part of the gas insulating switch for sucking the sulfur hexafluoride gas, and a vacuum tank with a filter attached to the inlet connected to the inlet through a suction gas pipe. A high-pressure gas tank connected to the outlet through a blow-out gas pipe; A sulfur hexafluoride gas insulated switchgear comprising: