Detection of gas decomposition products of SF_6 gas-insulated electric equipment under faults and its applications

SF6 electrical equipment is widely used in power systems.Finding effective methods to detect and judge equipment faults is very important to equipment status monitoring.Composition of gas decomposition products,fault operation experiences and common field detection methods were discussed.Detailed analyses for those detection methods were given in the aspects of test items,measurement ranges,minimum volume fraction detectable and detection styles.The analyses can provide references for effective and quick fault detection and online status monitoring of devices.It was proposed that the gas decomposition detection should be brought into the set of preventive tests of SF6 gas-insulated electric equipment.