EMERSON VE4050S2K1C0 Timer module

EMERSON VE4050S2K1C0 Timer module

SEPARATE-SOURCE VOLTAGE WITHSTAND TEST The purpose of the test is testing the insulation between the windings and the insulation between windings and earthed parts (tank, press iron, etc.), under the temporary and switching over-voltages conditions which may be occurred during the service.

The tests, which are made with separate source voltage, shall be made at rated frequency or at a frequency not less than the 80 percent of the rated frequency. This allows the testing of 60 Hz transformers at 50 Hz. The waveform of voltage must be sinusoidal as much as possible and must be single phase.

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The voltage is measured 

using a capacitive voltage divider in conjunction with voltmeter response to peak values. The peak voltmeter indicates the peak value divided by √2. The test duration is one minute. The test voltage is applied to the winding which is going to be tested (all terminals of this winding is short-circuited) while the terminals of the other windings are connected to each other, the windings that are not under test voltage, tank and core also should be grounded. Secondary winding terminals of the bushing type CT’s shall be connected to each other’s and grounded in order to prevent unwanted sparkings.

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