This technical article briefly describes seven very important tests you should perform during commissioning of a dry-type transformer. Usually tests are performed in the factory where transformers are produced.
The following routine tests must be carried out on all dry-type power transformers:
Separate-source voltage withstand test
Induced voltage test
Voltage ratio measurement and check of polarities and connections
No-load current and no-load loss measurement
Winding resistance measurement
Short-circuit impedance and load loss measurement
Partial discharge measurement in accordance with IEC 60726(for dry-type power transformers)
Varelen Electric Co., Ltd