5. A 250/500V single phase transformer gave the following test results:S.C. TestО.С. TestIsc= 24AVsc= 10VPsc= 100WIoc= 1AVoc= 250VРос- 80WThe 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 2781Ω, j264 Ω8002, j100 2781Ω, j264 Ωc- Secondary current referred to the primary side I:202 - 36.86 A102 - 36.86 A102 + 36.86 A202 + 36.86 Ad- The primary voltage V1:3574- 0.9 V3574 + 0.9 V2574 - 0.9 V2574 + 0.9 Ve- Total transformer losses (core and copper losses):54 W254 W154 W354 WTItransformer efficiency:90%96%80%86%O O O O

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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 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):

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):

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Distribution System

The final stage in the delivery of the electric power is the electric power distribution system. From the transmission system to the individual customers it carries electricity. The distribution system is connected with the transmission system and is used to lower the voltage of the transmission to medium voltage in the range of 2 kV to 35 kV with the help of transformers. This medium voltage to the distribution transformers located near the customer's premises is carried by the primary distribution system lines. These distribution transformers in turn lower the voltage to utilization voltage used in lightings, household appliances, industrial equipments etc. Through secondary distribution lines often several customers are supplied from one transformer. It is through service drops, the commercial and residential customers are connected to the secondary distribution system lines. Customers who demand a larger amount of power can be connected directly to the primary distribution system level or the sub-transmission level.

Question

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

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