ENTEK C6691 interface module

ENTEK C6691 interface module

Transformers with U m < 72,5 kV normally , no partial discharge measurements are performed during this test. Test duration and voltage are explained above. Transformers with U m> 72,5 kV this transformers shall all, if not otherwise agreed, be tested with partial discharge measurement. The partial discharge performance shall be controlled according to the time sequence for the application of the voltage as shown in figure 7.2 :

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non-uniformly insulated windings : 

For three phase transformers, two test sets are required ; 1. A phase-to-earth test with rated withstand voltages between phase and earth with partial discharge measurement. 2. A phase-to-phase test with earthed neutral and with rated withstand voltages between phases with partial discharge measurement. The test shall be carried out in accordance with uniformly windings ( subclause a ). On single –phase transformers, only a phase-to-earth test is required.

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