Gas chromatograph for detecting SF6 in transformer oil dissolved gas

Abstract

The invention relates to a gas chromatograph for detecting SF6 in transformer oil dissolved gas. The method is characterized in that the method is characterized by comprising the following steps; thegas chromatograph comprises a carrier gas system, a sample injection system, a switching valve system, a chromatographic column system, a detection system and an emptying needle valve, wherein the carrier gas system comprises three paths of carrier gas, the sample injection system comprises a sample injector, the switching valve system comprises two six-way valves, the chromatographic column system comprises two chromatographic columns, the detection system comprises a helium ionization detector, and the emptying needle valve comprises two needle valves. According to the gas chromatograph, theproblems of impurity interference and detection sensitivity are fully considered, the connection structure of each component is optimally designed, the ppb-level SF6 in the transformer oil dissolvedgas is detected, the complete separation and peak appearance of SF6, CO2 and C2 are realized, and the online monitoring level of the insulation condition of the transformer is improved.

Description

technical field [0001] The invention relates to a gas chromatographic analysis device, in particular to a method for detecting SF in dissolved gas of transformer oil. 6 The gas chromatograph not only uses the high sensitivity of the helium ionization detector to realize the ppb level SF in the dissolved gas of transformer oil 6 detection while also addressing the CO 2 and C2 on SF 6 interference problem, the realization of the SF 6 , CO 2 and C2 are completely separated and peaked. Background technique [0002] With the development of electric power, not only the sulfur hexafluoride SF 6 GIS, circuit breakers, rheology, voltage transformers, and transformers are insulating media, and transformer bushings insulated by sulfur hexafluoride have also appeared. If the seal between the bushing and the main transformer is damaged, the high pressure six Sulfur fluoride gas will enter the transformer body, causing the gas action of the transformer, and even the phenomenon of oi...

AI Technical Summary

Problems solved by technology

[0003] Traditional detection SF 6 Gas means, generally using thermal conductivity detectors, for SF 6 The detection limit is about 1ppm, for SF below the detection limit 6 The purpose of monitoring is not achieved, and the traditional method does not consider SF 6 and C2 and CO 2 The problem of separation interference, which will cause great trouble to judge the test results

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