WAI Transformer Handbook _FINAL_2.24.26_Flipbook Version

D. Short Circuit Current Calculating fault current at the transformer secondary ignoring motor contribution. Data Needed:

Nameplate kVA Rating

• • •

Nameplate Secondary Voltage

Nameplate %Z First, calculate per phase nameplate current: For three-phase transformers this would be:

For single-phase transformers:

Then simply divide the “Nameplate Current” by the %Z divided by 100.

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