Ericsson ELU-D3 Timer card

Ericsson ELU-D3 Timer card

The application of a voltage, which will produce a determined impulse voltage magnitude in the neutral point, to the parallel connected line terminals. b) The direct application of determined impulse voltage to the neutral point. When an impulse is applied to the neutral terminal “stated in b”, a voltage waveform which has longer front duration ( up to 13 µS ) is permissible according to the standards.

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SWITCHING IMPULSE TEST 

The purpose of the switching impulse test is to secure that the insulation between windings, between windings and earth, between line terminals and earth and between different terminals withstand the switching overvoltages which may occur in service. The switching impulse voltage is simply produced by conventional impulse voltage generator. The polarity of the voltage is negative, and form of the voltage shall be T1 /Td / T2 ≥ 200/200/500 µS according to IEC 60076.3 (fig. 16.2). Test conditions determine the choice of transformers tapping, see clause 5.

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