Title :
Trapped charge-induced field distortion on GIS spacers
Author :
Boggs, Steven A. ; Wang, Ying
Author_Institution :
Dept. of Electr. Eng., Toronto Univ., Ont., Canada
fDate :
7/1/1995 12:00:00 AM
Abstract :
Operation of GIS (gas insulated substations) disconnecters can leave a DC voltage (electric field) on the switchgear which can cause charging of spacer surfaces. Analysis indicates that the surface charge density is related to the voltage-induced field. The charge distribution is likely to take the form of a strip, with a sharp termination of the charge density at one end which can result in a substantial field enhancement which adds to the field induced by the disconnector upon closing and increases the probability of a surface flashover when the disconnector is closed. This may explain failures in some early 550 kV disconnector designs
Keywords :
electric fields; gas insulated substations; surface charging; switchgear; 550 kV; DC voltage; GIS spacers; charge distribution; disconnector closing; electric field; gas insulated substations; spacer surfaces charging; surface charge density; surface flashover probability; switchgear; trapped charge-induced field distortion; voltage-induced field; Circuit breakers; Dielectrics and electrical insulation; Educational institutions; Electrodes; Geographic Information Systems; Substations; Surface charging; Surface discharges; Surges; Voltage;
Journal_Title :
Power Delivery, IEEE Transactions on
