... 150KV cable and 150KV&500KV GIS. The whole test set consists of variable frequency power source, excitation transformer, 4 pieces of inductors, and ... 4.The Test Set Composed of:√ Exciting Transformer, 60kVA/6kV/12kV/24KV, oil immersed,1 piece, about 350Kg√ Variable Frequency Power Supply, 60kW ... weeks for rated voltage more than 600KV. XZF1600KVA/640kV Variable frequency resonance test system