... 2.excitation transformer, reactor, voltage divider. resonance test system,AC Resonance Withstand Voltage Test system,high voltage test systemTransformer, GIS, SF6 ... product and application: ModelApplication(10kV~500kV transformer substation AC voltage withstand equipment, frequency: 30~300Hz )Frequency power sourceResonant ... of the measured equipment. AC Resonance Withstand Voltage Test system