Transformer Voltage Decay

[richanton]

I have a question that I can't seem to locate an answer for.

If I have a 45kva dry type transformer connected to a shunt trip breaker on the primary side and I trip that breaker, does anyone have any idea of how fast the secondary voltage of the transformer would decay or a formula to calculate that. Apparently there is some time delay between when the primary voltage goes to zero and when the secondary side voltage also gets to zero due to the nature of the transformer coils.

 

[waross]

The transformer voltages will tend to finish the half cycle they were on at the moment of interruption. Depending on the load characteristics the waveform may no longer be symmetrical. If the load is capacitive, the circuit changes from a transformer feeding a load to an LCR circuit with a decaying voltage. There may also be ringing at a frequency characteristic to the L and C of the circuit. This is a property of the circuit and not of the transformer. This is residual energy stored in the circuit being dissipated, not power supplied by the transformer.

Bill
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