Distribution Transformer Fault Current Tables

For transformers in the downtown Network area contact a Network Design representative to obtain the fault current.

Customers should be advised that the fault current calculations were performed using infinite bus at the transformer secondary terminals.

Note: Austin Energy reserves the right to make system modifications including feed changes and transformer upgrades to maintain service without customer notification. System modifications can result in higher fault currents.

Transformer Size/Type   Fault Current (amperes)  
120/240 volt single-phase 120/208 volt three-phase 277/480 volt three-phase
Single-Phase Transformers
1-10 kVA/1-ph 2778 n/a n/a
1-25 kVA/1-ph 6944 n/a n/a
1-50 kVA/1-ph 13889 n/a n/a
1-75 kVA/1-ph 20833 n/a n/a
1-100 kVA/1-ph 27778 n/a n/a
1-167 kVA/1-ph 43490 n/a n/a
Three-Phase Transformers
75 kVA n/a 11566 5011
150 kVA n/a 23132 10024
225 kVA n/a 34698 15036
300 kVA n/a 46263 20047
500 kVA n/a 77106 33412
750 kVA n/a 39280 17021
1000 kVA n/a 52374 22695
1500 kVA n/a n/a 34043
2000 kVA n/a n/a 45391
2500 kVA n/a n/a 56738

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Date last reviewed or modified: 4/25/16

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