5. A 250/500V single phase transformer gave the following test results: S.C. Test О.С. Test Isc= 24A Vsc= 10V Psc= 100W Ioc= 1A Voc= 250V Poc= 80W The transformer was later connected to a 500V, 10A at 0.8 lagging power factor load, calculate: a- The equivalent primary and secondary resistance and reactance referred to primary side (Reg, Xea):

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5. A 250/500V single phase transformer gave the following test results:
S.C. Test
О.С. Test
Isc= 24A
Vsc= 10V
Psc= 100W
Ioc= 1A
Voc= 250V
Рос- 80W
The transformer was later connected to a 500V, 10A at 0.8 lagging power factor load, calculate:
a- The equivalent primary and secondary resistance and reactance referred to primary side
(Req, Xeq):
Transcribed Image Text:5. A 250/500V single phase transformer gave the following test results: S.C. Test О.С. Test Isc= 24A Vsc= 10V Psc= 100W Ioc= 1A Voc= 250V Рос- 80W The transformer was later connected to a 500V, 10A at 0.8 lagging power factor load, calculate: a- The equivalent primary and secondary resistance and reactance referred to primary side (Req, Xeq):
b- the core loss resistance Rc and magnetizing reactance Xm:
800 2, -j100 2
781Ω, j264 Ω
8002, j100 2
781Ω, j264 Ω
c- Secondary current referred to the primary side I:
202 - 36.86 A
102 - 36.86 A
102 + 36.86 A
202 + 36.86 A
d- The primary voltage V1:
3574- 0.9 V
3574 + 0.9 V
2574 - 0.9 V
2574 + 0.9 V
e- Total transformer losses (core and copper losses):
54 W
254 W
154 W
354 W
TI
transformer efficiency:
90%
96%
80%
86%
O O O O
Transcribed Image Text:b- the core loss resistance Rc and magnetizing reactance Xm: 800 2, -j100 2 781Ω, j264 Ω 8002, j100 2 781Ω, j264 Ω c- Secondary current referred to the primary side I: 202 - 36.86 A 102 - 36.86 A 102 + 36.86 A 202 + 36.86 A d- The primary voltage V1: 3574- 0.9 V 3574 + 0.9 V 2574 - 0.9 V 2574 + 0.9 V e- Total transformer losses (core and copper losses): 54 W 254 W 154 W 354 W TI transformer efficiency: 90% 96% 80% 86% O O O O
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