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Transformer Loss Calculation Guide

The document details the loss calculations for a transformer rated at 26 MVA and 50 Hz, including no load (core) loss of 12 KW and full load (copper) loss totaling 93 KW. Additional losses such as lead loss, stray loss, and auxiliary loss contribute to a total loss of 108 KW. Key parameters such as winding resistance and core specifications are also provided for accurate loss assessment.

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ashish saha
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178 views1 page

Transformer Loss Calculation Guide

The document details the loss calculations for a transformer rated at 26 MVA and 50 Hz, including no load (core) loss of 12 KW and full load (copper) loss totaling 93 KW. Additional losses such as lead loss, stray loss, and auxiliary loss contribute to a total loss of 108 KW. Key parameters such as winding resistance and core specifications are also provided for accurate loss assessment.

Uploaded by

ashish saha
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Transformer Loss Calculation

Rated Power = 26 MVA


Rated Frequency = 50 Hz
Rated Volatge (HV) = 33 KV
Rated Volatge (LV) = 11 KV
Rated Current (HV,Δ) = 263 A Phase
Rated Current (LV,Y) = 1365 A Phase
Percentage Impedance = 8.5 %

Calculation of No Load Loss (Core Loss)

Core Dia = 540 mm


Total Weight of Core (G) = 13539 Kg
Maxm. Flux Density = 1.68 Tesla
Core Loss/Kg (p) = 0.8 Watt/Kg
Safety Factor (K) = 1.1

No Load Loss (Po=K x p x G) = 12 KW

Calculation of Full Load Loss (Copper Loss)

i. Winding Resistance Loss Calculation


LV Winding HV Winding
Inner Dia = 729 mm Inner Dia = 976 mm
Outer Dia = 570 mm Outer Dia = 765 mm
Mean Dia = 649.5 mm Mean Dia = 870.5 mm

C (=πd) = 2040 mm C (=πd) = 2735 mm

No. of Turns = 80 No. of Turns = 416


LT Winding Area = 491 mm² HT Winding Area = 134.69 mm²
Temperature Coefficient = 0.02135 Temperature Coefficient = 0.02135
LV Resistance at 75°C = 0.0071 Ω/Phase HV Resistance at 75°C = 0.1803 Ω/Phase

Winding Resistance Loss,LV (=3I²R) = 40 KW Winding Resistance Loss,HV (=3I²R) = 37 KW

Weight of LV Winding = 2158 Kg Weight of LV Winding = 4128 Kg

ii. Additional Loss Calculation


Additional Loss,LV = 4 KW Additional Loss,HV = 3 KW

iii. Lead Loss Calculation


Lead Loss = 1 KW

iv. Stray Loss Calculation


Stray Loss (=K x Uk x Se x 100) = 9 KW

Auxiliary Loss of Transformer

Total No. of Cooling Fan = 5 Nos.


Rating of Each Fan = 0.5 KW
Auxiliary Loss = 3 KW

Summary

Full Load Loss (Copper Loss) = 93 Nos.


No Load Loss (Core Loss) = 12 KW
Auxiliary Loss = 3 KW

Total Loss = 108 KW

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