The AC withstand voltage test of transformer shall meet the following requirements:
When the voltage level of the transformer is v and above, and the capacity is va and above, the DC leakage current should be measured;
The test voltage standard shall comply with the provisions in the table. When the test voltage is applied up to in, read the leakage current at the high voltage terminal. The leakage current value should not exceed the provisions in Appendix III of this standard.
DC leakage test voltage standard of surface immersed power transformer:
Rated voltage of winding (kV)
DC test voltage (kV)
Main technical parameters of complete set of AC withstand voltage test transformer:
Working power supply;/, Z * Test capacity: va
(Test voltage: v and below * Resonance frequency range: z
Test voltage waveform: sine wave waveform distortion rate is less than or equal to
Test voltage accuracy:
Frequency regulation: z * protection response time: less than seconds
The system has overvoltage protection, overcurrent protection, discharge protection, breakdown tripping protection and overheating protection.