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A Defect Model for Simulating Suspended Potential Discharge in GIS

GIS is an important power equipment in power system, which is the basis of ensuring power supply reliability. Although the reliability of GIS operation is very high, there are inevitable defects in GIS, such as partial discharge, insulation deterioration and equipment failure. A defect model is designed to simulate the suspended potential discharge in GIS, which can be used to simulate the common suspended potential discharge defects in GIS. It can be used to measure the partial discharge by combining the pulse current, UHF and decomposition component analysis methods, so as to promote the development of GIS partial discharge detection technology. The defect model consists of high voltage electrode, suspended potential body, ground electrode, fixture and SF6 gas. The results of partial discharge test show that the defect model can well simulate the suspended potential discharge in GIS equipment.