ENTEK C6660 Digital I/O module

ENTEK C6660 Digital I/O module

The test voltage is measured with capacitive voltage divider connected to H.V. terminal or the test voltage can be read from the voltmeter through voltage transformer in the low voltage side, which is calibrated with the voltage divider. Another method is to measure the test voltage from the peak value voltmeter, which is connected to the test tap of H.V. condenser bushings. The peak voltmeter indicates the peak value divided by √2. The test duration not being less than 15 seconds is determined by the following formula;

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Uniformly insulated windings 

Test connection is essentially the same as in service, a three phase symmetrical voltage is supplied. The test voltage is generally twice as the rated voltage. However, the voltage between line terminals of any winding shall not exceed the rated short duration power frequency withstand voltage. The tappings of the transformer should be accordingly. The voltage is measured from terminals to earth or between terminals of the low voltage winding using precision voltage transformers.

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