Fast delivery I 24-hour customer service I customizable 30-300Hz, test voltage 128kV, test time 60min. 2. AC withstand voltage test for 220kV GIS, switches, and circuit breakers, with a test frequency of 30-300Hz, a test voltage not exceeding 495kV, and a test time of 1 minute. 3. AC withstand voltage test for 1 lOkV GIS, switches, and circuit breakers, with a test frequency of 30-300Hz, a test voltage not exceeding 265kV, and a test time of 1 minute. 4. AC withstand voltage test of 35kV/300mm2 cable for 3km, capacitance < 0.5835uF, test frequency 30-300Hz, test voltage 52kV, test time 60min. 5. 10kV/300mm2 cable 6km AC withstand voltage test, capacitance < 2.253uF, test frequency 30-300Hz, test voltage 22kV, test time 5min. 6. AC voltage withstand test for 0.5km of 220kV/630mm2 cable, capacitance < 0.072uF, test frequency 30-300Hz, test voltage 216kV, test time 60min. 7. AC withstand voltage test for full insulation of 110kV/80000kVA main transformer, with capacitance < 0.02uF, test frequency 45-65Hz, test voltage not exceeding 160kV, and test time of 1 minute. 2. Input power: Three-phase 380V input, the frequency is 50Hz; 6. Device output waveform: sine wave 7. Waveform distortion rate: output voltage waveform distortion rate < 1%; 8. Working time: continuous 60min allowed under rated load; overvoltage 1.1 times for 1 minute; 9. Temperature rise: The temperature rise is less than or equal to 65K after continuous operation under rated load for 60min; 10. Quality factor: the device itself Q>30 (f=45Hz); 11. Protection function: It has overcurrent, overvoltage and flashover protection for the tested product (see the variable frequency power supply section for details); 12. Measurement accuracy: system RMS level 1.5;