Surface Charge Accumulation Characteristic on GIL Three-pillar Insulator
Surface charge accumulation characteristics are mainly concentrated in flat sample and insulating spacer and the report on surface charge accumulation characteristics of the GIL three-pillar insulator is less.In this paper,the actual 550 kV GIL three-pillar insulator is taken as the prototype,a three-dimensional measurement test platform for three-pillar insulator is set up and the surface charge accumulation of the three-pillar insulator is obtained by test-ing by using the capacitive probe method to change voltage amplitude,voltage application duration and surface rough-ness.The results show that under the action of AC voltage the accumulated charge density at the GIL three-pillar in-sulator area is smaller and at the abdomen area is higher.Increase of test voltage amplitude,extension of operation time of test voltage and increase of surface roughness of insulator can increase the surface charge density of GIL.Un-der certain condition,with the accumulation of surface charge at AC voltage the surface flashover voltage of the 500 kV three-pillar insulator is reduced by about 9.6%.The research in this paper can provide a kind of solution for the design optimization,operation and maintenance of GIL three-pillar insulator.
万方数据
维普
