... by manufacturer of 1000KV, 750KV, 500KV-220KV, 110KV HV switch, power transformer, HV bushing, HV electro ceramics, insulator, etc. in ... delivery inspection. Applicable to test of power frequency voltage withstand and PD by manufacturer of 750KV, 500kV ... number of primary test Similar and related parameters to other power equipments PD-free Power Frequency Resonance test system