ELECTROSTATIC GRADING LAYER FOR THE SURFACE OF AN ELECTRICAL INSULATION EXPOSED TO HIGH ELECTRICAL STRESS

摘要

ELECTROSTATIC GRADING LAYER FOR THE SURFACE OF AN ELECTRICAL INSULATION EXPOSED TO HIGH ELECTRICAL STRESS A grading layer for a slot armor in an electric machine employs a layer of semi-conducting particles of silicon carbide bonded to the face of insulation of the slot armor. A layer of a tough high temperature paper such as an aramid paper separates the silicon carbide from the windings. The voltage gradient at the radially outerward through the armid paper to the silicon carbide layer wherein span-wise conduction decreases the peak voltage gradient to reduce the likeihood of the formation of corona andflashover..