Dielectric strength online monitoring device of SF6 gas and mixed gas thereof

Abstract

The invention discloses a dielectric strength online monitoring device of a SF6 gas and a mixed gas thereof. The device comprises a high-voltage direct current pulse generator used for generating unipolar voltage pulse signals; a test unit including a gas pressure-reducing valve and a sealing structure and used for obtaining the to-be-detected SF6 gas; a withstand voltage test probe arranged in the test unit as a detection device and electrically connected with the high-voltage direct current pulse generator, wherein the electrode gap of a probe portion thereof is adjustable, and the voltage between insulation gaps of the to-be-detected SF6 gas is adjustable; and a measurement and control unit connected with the high-voltage direct current pulse generator, the test unit and the withstand voltage test probe. The device is advantageous in that the dielectric strength of the insulation gaps of the SF6 gas is measured by employing a non-destructive breakdown method of the high-voltage pulse voltage technology, and the withstand voltage performance of the insulating medium is reflected.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to an on-line monitoring device for the dielectric strength of sulfur hexafluoride gas and its mixed gas. Background technique [0002] In recent years, with the rapid development of my country's electric power industry and the improvement of technical equipment, SF 6 Electrical equipment has been put into operation in large quantities. At present, in my country's 63-500KV power system, SF 6 Gas Insulated Circuit Breakers and SF 6 The application of gas insulated substation (GIS) has been quite extensive, so for SF 6 Daily supervision of electrical equipment is increasingly important. [0003] The best way to measure the electrical insulation performance of an insulating medium is to measure its insulation breakdown voltage (withstanding voltage value), which is the case for conventional insulating media such as insulating oil and solid insulating materials, and there are ...

AI Technical Summary

Problems solved by technology

During the construction process, it is inevitable that the air or oil and impurities in the recovery device will be mixed in, and the insulation medium will continue to deteriorate during the operation of the equipment, resulting in SF 6 Accidents are caused by the decline of gas insulation performance. At the same time, with the increase in the use of GIS equipment, SF 6 Insulation failures caused by air leakage and decomposition occur from time to time

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