Overall insulation of this transformer will be determined by measurement of transformer local discharge quantity under testing voltage.
1,Transformer neutral point AC withstand voltage
2,Long-term induced voltage test with partial discharge measurement (ACLD) for winding along with casing.
Testing principle (composition):
Determine overall insulation of the transformer through measurement of partial discharge quantity inside the transformer under testing voltage.
Brief introduction to the system:
The testing system consists of tested transformer, variable frequency power supply, exciting transformer, voltage divider, compensation reactor, testing impedor, and partial discharge instrument.
Wiring diagram of transformer partial discharge test
Wiring diagram for transformer neutral point withstand voltage test