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Transformers TestingTesting Of Transformers
Some of the tests specified in Indian Standards are listed below: 1. Measurement of winding resistance 2. Verification of voltage ratio 3. Verification of vector group 4. Measurement of no load current and losses 5. Measurement of impedance and load losses 6. Measurement of insulation resistance 7. Power frequencies withstand voltage 8. Induced over voltage test 9. Air presser test Type Tests 1. Impulse voltage withstand test 2. Temperature rise test TEST Ratio, Polarity and Phase Relationship
The ratio should be checked at all taps and between all the windings. It is checked by applying a single-phase 230V (approx) supply on the high voltage side and measuring the voltage on the low voltage side at all tap positions. The measured voltage on LV side shall conform to declining trend between tap (min) to tap (max) position for all phases.
Polarity and interphone connections are checked while measuring the ratio. This can be checked by the avometer method. The primary and secondary windings are connected together at points indicated in sketch shown below. A low voltage three-phase supply is then applied to the HV terminals. Readings obtained should be the vectorial sum of the separate voltages of each winding under consideration. |
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