Type Test and Routine Test of Transformer

For confirming the specifications and performances of an electrical power transformer it has to go through numbers of testing procedures. Some tests are done at manufacturer premises before delivering the transformer. Mainly two types of transformer testing are done at manufacturer premises- type test of transformer and routine test of transformer. In addition to that some transformer tests are also carried out at the consumer site before commissioning and also periodically in regular and emergency basis through out its service life.

 routine test of transformer

Type of Transformer Testing

Tests done at factory

  1. Type tests
  2. Routine tests
  3. Special tests

Tests done at site

  1. Pre-commissioning tests
  2. Periodic/condition monitoring tests
  3. Emergency tests

Type tests of transformer includes

  1. Transformer winding resistance measurement
  2. Transformer ratio test.
  3. Transformer vector group test.
  4. Measurement of impedance voltage/short circuit impedance (principal tap) and load loss (Short circuit test).
  5. Measurement of no load loss and current (Open circuit test).
  6. Measurement of insulation resistance.
  7. Dielectric tests of transformer.
  8. Temperature rise test of transformer.
  9. Tests on on-load tap-changer.
  10. Vacuum tests on tank and radiators.

Routine tests of transformer include

  1. Transformer winding resistance measurement.
  2. Transformer ratio test.
  3. Transformer vector group test.
  4. Measurement of impedance voltage/short circuit impedance (principal tap) and load loss (Short circuit test).
  5. Measurement of no load loss and current (Open circuit test)
  6. Measurement of insulation resistance.
  7. Dielectric tests of transformer.
  8. Tests on on-load tap-changer.
  9. Oil pressure test on transformer to check against leakages past joints and gaskets.

That means Routine tests of transformer include all the type tests except temperature rise and vacuum tests. The oil pressure test on transformer to check against leakages past joints and gaskets is included.

Special Tests of transformer include

  1. Dielectric tests.
  2. Measurement of zero-sequence impedance of three-phase transformers
  3. Short-circuit test.
  4. Measurement of acoustic noise level.
  5. Measurement of the harmonics of the no-load current.
  6. Measurement of the power taken by the fans and oil pumps.
  7. Tests on bought out components / accessories such as buchhloz relay, temperature indicators, pressure relief devices, oil preservation system etc.

 

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