Transformer Full Load Calculator

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SEL-501 oscillography captures transformer through fault in milliseconds (60-70 ms) without sending trip command as back-up. SEL-351S also record feeder faults.
Reference: Tarigma: Grid Enterprise Management (GEM) - waveform - Tarigma Event Viewer (TEV)
AH T3 failure
Studied by: Sam Ortega, Senior Engineer, SRP 3/31/2026
Disclaimer: The statements and opinions presented are the author’s alone and should not be interpreted as representing the official position, policies, or viewpoints of his employer.

Find Full Load Ampere (FLA) of a transformer per phase.

Given 15 /22 / 28 MVA Power Transformer, 3 Phase rating and 69 kV primary voltage

Primary Ampere
=
3 Phase MVA
Primary kV * 1.732


1 MVA = 1,000,000 VA ; 1 kV = 1000 V ; √3 = 1.732
Enter MVA value and kV value no need to do conversion. Answer is in ampere.

FOR SINGLE PHASE, MVA RATED

1 MVA = 1,000,000 VA ; 1 kV = 1000 V ;
Enter MVA value and kV value no need to do conversion. Answer is in ampere.



Ampere
=
1 Phase MVA
kV


FOR 3 PHASE , KVA RATED

1 kVA = 1,000 VA ; √3 = 1.732
Enter kVA value and voltage value no need to do conversion. Answer is in ampere.



Ampere
=
3 Phase kVA
V * 1.732


FOR 1 PHASE , KVA RATED

1 kVA = 1,000 VA ;
Enter kVA value and voltage value no need to do conversion. Answer is in ampere.



Ampere
=
1 Phase kVA
V




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