Hi-tech Corporation
Sayajiganj, Vadodara, Gujarat
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Testing Services

Leading Distributor / Channel Partner of power transformer testing from Vadodara.
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Power Transformer Testing
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Power Transformer Testing

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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 emergency basis through out its service life.Special Tests of Transformer Special tests of transformer is done as per customer requirement to obtain information useful to the user during operation or maintenance of the transformer. Pre Commissioning Test of Transformer In addition to these, the transformer also goes through some other tests, performed on it, before actual commissioning of the transformer at site. The transformer testing performed before commissioning the transformer at site is called pre-commissioning test of transformer. These tests are done to assess the condition of transformer after installation and compare the test results of all the low voltage tests with the factory test reports. 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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