Abstract
The safe operation of gas-insulated equipments is crucial to the whole power system. Free wire-type conducting particles within direct current (DC) gas-insulated equipments greatly threatens the insulation system by distorting the electric field and inducing partial discharge (PD) in insulation gas, And easily lead to accidents. Since SF 6 decomposes and generates a series of characteristic products under PD, the fault diagnosis and on-line monitoring of gas-insulated equipment can be realized effectively by analyzing these characteristic decomposition components and their variations of concentrations. In order to investigate the influence of free wire-type conducting particles on SF 6 decomposition characteristics under positive DC partial discharge, we establish a electrode system filled with pure SF 6 gas, positive DC partial discharge was generated by using a ball - bowl electrode, and three SF 6 characteristic decomposition components (SO 2 F 2 , SOF 2 and SO 2 ) were tested by gas chromatography mass spectrometer (GC/MS), finally we obtain the main features of SO 2 F 2 , SOF 2 and SO 2 under different diameters of free wire-type conducting particles. The effective generation rate r GMS was calculated and the experimental data shows that, with the increase of the diameter of free wire-type conducting particles, the generation of SO 2 F 2 , SOF 2 and SO 2 is inversely proportional to that, and the generation rate of SO 2 F 2 , SOF 2 and SO 2 is different.
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