Transformer MVA Rating

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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 3 phase MVA rating of a power transformer

Given 3 Phase Transformer with primary full load ampere (FLA) of 234.29 A and 69 kV primary voltage

FLA
=
3 phase MVA
kV * 1.732

Go to full load ampere calculator


Find 3 phase kVA rating of a transformer

Given 3 Phase Transformer with primary full load ampere (FLA) of 31.76 A and 600 V primary voltage

FLA
=
3 phase kVA
V * 1.732

Go to full load ampere calculator


Find 1 phase MVA rating of a transformer

Given 1 Phase Transformer with primary full load ampere (FLA) of 405.8 A and 69 kV primary voltage

FLA
=
1 phase MVA
kV

Go to full load ampere calculator


Find 1 phase kVA rating of a transformer

Given 1 Phase Transformer with primary full load ampere (FLA) of 55 A and 600 V primary voltage

FLA
=
1 phase kVA
V

Go to full load ampere calculator



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