Example: A single-phase, 100-kVA, 1000:100-V, 60-Hz transformer has the following test results: Open-circuit test (HV side open): 100 V, 6 A, 400 W Short-circuit test (LV side shorted): 50 V, 100 A, 1800 W Draw the equivalent circuit of the transformer referred to the high- voltage side. Label impedances numerically in ohms and in per unit. Determine the voltage regulation at rated secondary current with 0.6 power factor lagging. Assume the primary is supplied with rated voltage Determine the efficiency of the transformer when the secondary current is 75% of its rated value and the power factor at the load is 0.8 lagging with a secondary voltage of 98 V across the load

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Example: A single-phase, 100-kVA, 1000:100-V, 60-Hz transformer
has the following test results:
Open-circuit test (HV side open): 100 V, 6 A, 400 W
Short-circuit test (LV side shorted): 50 V, 100 A, 1800 W
Draw the equivalent circuit of the transformer referred to the high-
voltage side. Label impedances numerically in ohms and in per
unit.
Determine the voltage regulation at rated secondary current with
0.6 power factor lagging. Assume the primary is supplied with
rated voltage
Determine the efficiency of the transformer when the secondary
current is 75% of its rated value and the power factor at the load is
0.8 lagging with a secondary voltage of 98 V across the load
55
EMI Transformers
Dr Thamir Hassan ATYIA
Tikrit University
Transcribed Image Text:Example: A single-phase, 100-kVA, 1000:100-V, 60-Hz transformer has the following test results: Open-circuit test (HV side open): 100 V, 6 A, 400 W Short-circuit test (LV side shorted): 50 V, 100 A, 1800 W Draw the equivalent circuit of the transformer referred to the high- voltage side. Label impedances numerically in ohms and in per unit. Determine the voltage regulation at rated secondary current with 0.6 power factor lagging. Assume the primary is supplied with rated voltage Determine the efficiency of the transformer when the secondary current is 75% of its rated value and the power factor at the load is 0.8 lagging with a secondary voltage of 98 V across the load 55 EMI Transformers Dr Thamir Hassan ATYIA Tikrit University
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