Variations in the capacitance of delaminated HV stator insulation due to electrostatically generated forces

Abstract

Expressions that describe the variations in the capacitance and tan delta in delaminated stator winding insulation due to electrostatic forces have been obtained. Experimental results obtained on a stator whose insulation was seen to have delaminated dielectric support the suggested theory. Measurements performed at a relatively low voltage could be used to determine the extent of delamination and possibly the extent of aging of the insulation.<>