9 June 2019

Transformer Testing : Type Tests, Routine Tests and Special Tests

Testing of Transformer

  • The following types of type test, routine test and special tests are performed on the power transformer. 
  • These tests are to be performed at ambient air temperature below 50 degree centigrade. 
  • The tests are to be performed at manufacturer’s place.

Type tests

The following types of TYPE test to be performed on the transformer.
  • Winding resistance
  • Voltage ratio and check of voltage vector relationship
  • Impedance voltage / short circuit impedance considering principal tapping
  • Load loss
  • No load loss and current
  • Insulation resistance
  • Dielectric tests
  • Temperature rise
  • Tests on ON – load tap changer

Routine tests

The following type of ROUTINE tests to be performed on the transformer.
  • Winding resistance
  • Voltage ratio and check of voltage vector relationship
  • Impedance voltage / Short circuit impedance on principal tapping
  • Load loss
  • No load loss and current
  • Insulation resistance
  • Dielectric tests
  • Tests on ON load tap changers

Special tests

The following special tests are to be performed on the transformer.
  • Dielectric tests
  • Zero sequence impedance of three phase transformers
  • Short circuit test
  • Acoustic noise level
  • Harmonics of no load current
  • Power taken by fans and oil pumps

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