ENI GHW-12Z Multiplexer switch module
The current should remain constant during the test. The test is successful if no collapse of the test voltage occurs. This test is applied to the uniformly insulated windings and to the star point (neutral point) of the graded insulated (non-uniform) windings. Every point of the windings to which the voltage applied; is tested with the test voltage. The line terminals of non-uniform insulated windings are tested by induced overvoltage withstand test
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INDUCED OVERVOLTAGE WITHSTAND TEST
The purpose of the test is testing the insulation between the phase windings, turns, coils, tapping leads
and terminals, for non-uniformly insulated windings also the insulation between these parts and earth,
under the temporary and switching over-voltages conditions to which the transformer may be subjected
during its life time.
Normally, the excitation voltage is applied to the terminals of the low voltage winding while the terminals
of the other windings are left open or grounded in one point.
Since the test voltage is much higher than the rated voltage, the frequency of the test voltage is chosen
at least two times greater than the rated frequency without causing the over saturation in the core.
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