Transformer Loss Calculation
Rated Power
Rated Frequency
Rated Volatge (HV)
Rated Volatge (LV)
Rated Current (HV,Δ)
Rated Current (LV,Y)
Percentage Impedance
=
=
=
=
=
=
=
26
50
33
11
263
1365
8.5
MVA
Hz
KV
KV
A Phase
A Phase
%
Core Dia
Total Weight of Core (G)
Maxm. Flux Density
Core Loss/Kg (p)
Safety Factor (K)
=
=
=
=
=
540
13539
1.68
0.8
1.1
mm
Kg
Tesla
Watt/Kg
No Load Loss (Po=K x p x G)
=
12
KW
=
=
=
729
570
649.5
mm
mm
mm
HV Winding
Inner Dia
Outer Dia
Mean Dia
=
=
=
976
765
870.5
mm
mm
mm
C (=πd)
=
2040
mm
C (=πd)
=
2735
mm
No. of Turns
LT Winding Area
Temperature Coefficient
LV Resistance at 75°C
=
=
=
=
No. of Turns
HT Winding Area
Temperature Coefficient
HV Resistance at 75°C
=
=
=
=
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
=
=
=
5
0.5
3
Nos.
KW
KW
Full Load Loss (Copper Loss)
No Load Loss (Core Loss)
Auxiliary Loss
=
=
=
93
12
3
Nos.
KW
KW
Total Loss
=
108
KW
Calculation of No Load Loss (Core Loss)
Calculation of Full Load Loss (Copper Loss)
i. Winding Resistance Loss Calculation
LV Winding
Inner Dia
Outer Dia
Mean Dia
80
491
mm²
0.02135
0.0071 Ω/Phase
Auxiliary Loss of Transformer
Total No. of Cooling Fan
Rating of Each Fan
Auxiliary Loss
Summary
416
134.69 mm²
0.02135
0.1803 Ω/Phase