Temperature and voltage dependence of dielectric properties of modern epoxy mica insulations of HV rotating machines

The dependence of the dielectric properties of two types of modern epoxy mica insulation systems on temperature and voltage has been investigated. Resistance, capacity, polarization index and a number of other dielectric properties were measured over a temperature range of 20 to 100°C and at 1, 5,10 and 20 kV on rotating machine stator bars. This work will be submitted to the IEEE Std 43 committee.