Factory Tests

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:

1. Separate-source voltage withstand test 

2. Induced voltage test
   

3. Voltage ratio measurement and check of polarities and connections

4. No-load current and  no-load loss measurement
   

5. Winding resistance measurement

6. Short-circuit impedance and load loss measurement

7. Partial discharge measurement in accordance with IEC 60726(for dry-type power transformers)