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Transformer Current Ratio:
What's Useful and Important to You
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Transformer Current Ratio Calculator

This formula is valid for single phase current ratio

Given primary voltage = 69 kV ; secondary voltage = 12.47 kV
secondary current full load = 1,296.447 A ; Calculate the expected primary current full load

When you get your SEL relay fault current report, you can adjust the voltage to approximate the actual recorded relay fault current data. Use the actual secondary voltage and secondary current measurement from PI historian during fault timestamp.

Application of Current Ratio Formula in Estimating Short Circuit Fault Current

Given the nameplate base rating of a transformer: operational current (ampere) data of 320 MVA , 3 Phase Transformer, 525 / 230 kV as shown in table below.

Estimate the snapshot of temporary transient primary short circuit current, when there is SLG Fault in transmission line primary voltage source due to disturbance using the 10 kV instantaneous voltage drop recorded by PI historian during SLG fault.

Voltages(kV)	Amperes
525 Primary Voltage	803.29 Secondary Current
230 Secondary Voltage	351.92 Primary Current
Primary Single Line to Gnd Fault	Instantaneous or snap shot data
50 kV Primary SLG fault	803.29 Secondary Current
230 Secondary Voltage	3,695 Short Circuit Primary Current

In a no loss , ideal transformer , 100% efficient power transfer is usually assumed.

Power transformer efficiency based on efficiency test report is usually from 95% - 98%. So it is reasonable enough to assume a 100% efficiency.

What does 100% power transfer efficiency means? It means the
power generated in primary winding = power generated in secondary winding

Formula recall of power ( P = I V ).

Power Primary winding = I_p V_p

Power Secondary winding = I_s V_s

I_pV_p = I_s V_s

By algebraic manipulation.

V_p / V_s = I_s / I_p

By applying this knowledge and using PI historian snapshot value, we can estimate the magnitude of short circuit current and estimate the magnetic forces to the primary or secondary winding of a power transformer depending on where the SLG fault happened. Even better if you have Pi historian data, you can create a streaming data of SLG Fault by using PI expression equation.

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Personal Augmented Intelligence (AI) Explanation

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Understanding the difference between collaboration and automation

🔍 Messaging Contrast

Augmented Intelligence is like a co-pilot: it amplifies your strengths, helps you recall, analyze, and decide — but it never flies solo.

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