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Influence of Surface Charge Induced by Nano-Second Pulse on Field Distribution of Vacuum Insulator
Author(s): 
Pages: 1437-1442
Year: Issue:  12
Journal: Vacuum Science and Technology

Keyword:  Nanosecond pulseVacuumCharge accumulationElectrostatic capacitance probeElectric field distributionFlashover;
Abstract: The field distribution on the vacuum insulator,originated from the nano-second pulse induced charge accumulation,wasmathematically modeled,analytically calculated,numerically simulated with software ANSYS and experimentally evaluated with a lab-built setup. The influence of the surface properties,including the resistivity and microstructures,on the surface distributions of charge density and field was investigated with scanning electron microscopy. The results show that depending on the surface property of the insulator,the charge accumulation often strongly increases the surface field distribution with few exceptions. At most,the field could be enhanced by two times. We suggest that the insulating properties could be enhanced with the surfaces highly resistant to surface charge accumulation.
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