Dielectric performance of gas-insulated switchgear and possible methods of on-line monitoring

The dielectric performance of gas-insulated switchgear (GIS) is critical to its long term service integrity. Many parameters that are of little significance to open type air insulated switchgear are of vital importance to GIS. Detailed on-site examination is necessary to ensure chamber cleanliness during site erection as a foreign object left inside can in itself induce dielectric breakdown. In addition loose, or ineffectively bonded, line or earth side components can vibrate under the effects of both magnetic and electrostatic forces to induce partial discharge activity