The following test results of a single-phase step-down transformer which were measured at primary side: Open Circuit Test: Voc= 415V; loc= 0.22A; Poc= 7.64W; Vo=240V Short Circuit Test: Vsc= 25.2V; Isc= 18.07A; Psc= 142.43W 7. An inductive load was then connected to the step down transformer and recorded that the full load output current Is = 31.25A. Determine: a. Equivalent resistance of the transformer referred to the primary circuit Req and equivalent reactance of the transformer referred to the

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.16P: A single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters:...
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7.
The following test results of a single-phase step-down transformer
which were measured at primary side:
Open Circuit Test: Voc= 415V; loc= 0.22A; Poc= 7.64W; Vo=240V
Short Circuit Test: Vsc= 25.2V; Isc= 18.07A; Psc= 142.43W
An inductive load was then connected to the step down transformer
and recorded that the full load output current Is 31.25A.
Determine:
a. Equivalent resistance of the transformer referred to the primary circuit
Req and equivalent reactance of the transformer referred to the
primary circuit Xeq,
b. Transformer core loss resistance Re and inductor core loss Xm,
c. Percent Voltage Regulation V.R. of the transformer when delivering
full load power 5700W at power factor 0.8 lagging.
Transcribed Image Text:7. The following test results of a single-phase step-down transformer which were measured at primary side: Open Circuit Test: Voc= 415V; loc= 0.22A; Poc= 7.64W; Vo=240V Short Circuit Test: Vsc= 25.2V; Isc= 18.07A; Psc= 142.43W An inductive load was then connected to the step down transformer and recorded that the full load output current Is 31.25A. Determine: a. Equivalent resistance of the transformer referred to the primary circuit Req and equivalent reactance of the transformer referred to the primary circuit Xeq, b. Transformer core loss resistance Re and inductor core loss Xm, c. Percent Voltage Regulation V.R. of the transformer when delivering full load power 5700W at power factor 0.8 lagging.
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