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Earth Fault Current Via Auto-Transformer

Thread starter alingstone
Start date Sep 2, 2015

Status: Not open for further replies.

Sep 2, 2015

alingstone

Electrical

Hi, I have a 22kV source transformer 66/22 Dyn3, and downstream of the 22 I have a 22/11 grounded auto-transformer Yna0. If I have a single phase to ground fault on the 11kV side of the auto-transformer of magnitude (say) 100A, how many earth fault amps will the 22kV relay back at the source see, is it the full 100A or is it only 50A.