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Transformer Losses Calculation (As per Transformer Test Results)
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Transformer Specifications:Actual load on Transformer:
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Output kVA800kVAActual Connected load520kVA
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High voltage Volts6600VoltsActual loading of Transformer65%65%
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Low voltage Volts400VoltsVoltage, VL427Volts
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Full load current-secondary Amp1154AmpMeasured load current, IL1000Amp
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Full load current primary Amp70AmpWinding temperature, T75°C
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Efficiency %%Total Working Hours/Annum8760
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Reference temperature °C75°CCO2 emission at Rate of 0.4Kg/Kwh
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Frequency Hz50 Hz
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No load test:Results (Actual Load Current):
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R.M.S. Voltage, Vrms 429VoltsForm factor, k p.u1.13
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Average voltage, Vavg 403VoltsCorrected no load losses 1919.47Watts
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Frequency, f 50 HzTotal Core loss at actual voltage and freq.12650Watts
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No load Current, Inl A9.96AmpTotal Copper loss estimated at test current 45Watts
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No load power input, Pnl Watts1960WattsStray losses at test current 22Watts
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Winding resistance of secondary (L.V.) side (Rph-2)0.00111ΩTotal Copper loss at full load current11101Watts
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Winding resistance of primary (H.V.) side,(Rph-1)1.03ΩStray losses at full load current3893Watts
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Ambient temperature 75°CTotal Copper loss at actual load current8336Watts
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Total Stray losses at actual load current2923Watts
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Short circuit test:Total No Load losses at actual load12650Watts
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Applied reduced voltage on H.V, Vsc (Average of three currents measured)36.6VoltsTotal Load Load losses at actual load11259Watts
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H.V. side phase current, ( Average of three currents measured) Is12.78AmpTotal Losses at actual load23909Watts
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Power measured ( average of three power measured), Wsc-m44.3WattsEfficiency at actual load97.1%
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Total power input at short circuit, Wsc66.45Watts
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Results (Full Load Current):
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Form factor, k p.u. 1.13
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Corrected no load loss1919.471608WattsJignesh.Parmar
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Total Core loss at rated voltage and freq. Watts2207.884214Wattsjiguparmar@yahoo.com
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Total Copper loss estimated at test current 44.90028443Wattswww.electricalnotes.wordpress.com
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Stray losses at test current 21.54971557Watts
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Total Copper loss at full load current 11100.69437Watts
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Total Stray losses at full load current 3893.23802Watts
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Total losses at full load Watts 17201.8166Watts
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Efficiency at full load 97.9%
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