Dielectric Strength

Dielectric Strength of windings is a main parameter of a Hydro Generator.The generator winding should safely withstand the following power frequency test voltages for one minute in accordance with IEC 60034-1. Normally Stator winding 28600V Rotor winding ten times the rated excitation voltage with minimum of 1500V.This Dielectric property decides the Insulation Class and the size of the machine.