Testing of current transformer
The following testing are done at the current transformer .Which is given below:-
i)Type Testes:-
- Verification of terminal marking and polarity.
- High voltage power frequency test on primary windings.
- Over voltage inter-turn test.
- Determination of error according to requirements of appropriate accuracy class.
- Short time current test.
- Temperature rise test.
- Impulse voltage test for current transformer for service in electrically exposed installations.
Special type testing may be done on current transformer .
- High voltage power frequency wet withstand voltage test on outdoor current transformer.
- Partial discharge test.
(ii) Routine Tests:-
- Verification of terminal markings and polarity.
- High voltage power frequency test on primary windings.
- High voltage power frequency test on secondary windings.
- Over voltage inter turn test.
- Determination of error according to the requirements of appropriate accuracy class.
- Accuracy test.