Cross interference elimination method for detection of SF6 decomposition products

Abstract

The invention discloses a cross interference elimination method for detection of SF6 decomposition products. The method comprises steps as follows: step 1, an SF6 decomposition product detection system structure is built; step 2, an interference model of H2 gas to a CO sensor and a SO2 sensor is established, H2 sample gases which take SF6 as base gas and have different H2 concentrations are introduced to a detection gas circuit, and an interference function is solved; step 3, a relation model of the concentration value NCO of CO and a voltage value VCO measured by the CO sensor is established, CO sample gases which take SF6 as base gas and have different CO concentrations ARE introduced to the detection gas circuit, and the actual centration N'CO is calculated; step 4, the relation model of the concentration value NSO2 of SO2 and the voltage value VSO2 measured by the SO2 sensor is established, SO2 sample gases which take SF6 as base gas and have different SO2 concentrations are introduced to the detection gas circuit, and the actual concentration N'SO2 is calculated. With the adoption of the cross interference elimination method, the most real and accurate concentration values of CO and SO2 can be calculated and detected when the sample gases in SF6 electrical equipment are detected on site.

Description

technical field [0001] The present invention relates to SF 6 The field of electrical equipment testing, specifically related to SF 6 Cross-interference removal method for decomposition product detection. Background technique [0002] Currently most of SF 6 Decomposition product detection devices adopt the principle of chemical sensor testing, CO, SO 2 It is the most important characteristic component of decomposition products; but limited by the principle, the CO sensor not only responds to CO, but also responds to H 2 Generate large interfering electrical signals; SO 2 The sensor is also subject to H 2 The influence of the interference signal; while most SF 6 H may be present in electrical equipment 2 , the content may even exceed 1000ppm, which will seriously affect the accuracy of the decomposition product test and bring uncertainty to the failure assessment. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the present invention pr...

AI Technical Summary

Problems solved by technology

[0002] Currently most of SF 6 Decomposition product detection devices adopt the principle of chemical sensor testing, CO, SO 2 It is the most important characteristic component of decomposition products; but limited by the principle, the CO sensor not only responds to CO, but also responds to H 2 Generate large interfering electrical signals; SO 2 The sensor is also subject to H 2 The influence of the interference signal; while most SF 6 H may be present in electrical equipment 2 , the content may even exceed 1000ppm, which will seriously affect the accuracy of the decomposition product test and bring uncertainty to the failure assessment

Images