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Earthing Transformer ( zigzag wound ) sizing claculation method

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VarmaPinnamaraju

VarmaPinnamaraju

Electrical
Jul 11, 2012
2
Hi,

Please advice for the ZigZag wound Earthing Transformer sizing calculation basis and formulaes.
Earthing Trafo to be connected to : 22kV, 3 phase, 3 wire, 1250Amp, Isc 25kA bus.
(22kV bus upstream is connected to YNd1 40MVA 230/22kv Transformer )
Maximum line fault current : 400 Amp, 30 sec.

thanks...
 
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