(a) A 5 MVA 230/10.5-kV single-phase power transformer has a per-unit resistance of 1.5% and a per-unit reactance of 6% (data taken from the transformer's nameplate). The transformer approximate equivalent circuit is given in Figure Q1 (a). The open-circuit test performed on the low-voltage side of the transformer yielded the following data: Voc = 120 kV loc = 10 A Poc = 60 kW %3D %3D %3D Refer to the low-voltage side of the transformer and calculate: (i) The value of Req and Xeq. (ii) The value of Rc and Xm.
(a) A 5 MVA 230/10.5-kV single-phase power transformer has a per-unit resistance of 1.5% and a per-unit reactance of 6% (data taken from the transformer's nameplate). The transformer approximate equivalent circuit is given in Figure Q1 (a). The open-circuit test performed on the low-voltage side of the transformer yielded the following data: Voc = 120 kV loc = 10 A Poc = 60 kW %3D %3D %3D Refer to the low-voltage side of the transformer and calculate: (i) The value of Req and Xeq. (ii) The value of Rc and Xm.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:(a) A 5 MVA 230/10.5-kV single-phase power transformer has a per-unit resistance of 1.5%
and a per-unit reactance of 6% (data taken from the transformer's nameplate). The
transformer approximate equivalent circuit is given in Figure Q1 (a). The open-circuit test
performed on the low-voltage side of the transformer yielded the following data:
Voc = 120 kV
loc = 10 A
Poc = 60 kW
%3D
Refer to the low-voltage side of the transformer and calculate:
(i)
The value of Req and Xeq.
(i)
The value of Rc and Xm.
(ii)
The voltage regulation when secondary voltage Vs = 11 kV and the secondary
%3D
current Is = 300 A.
%3D
1,
Rea
jXcu
Re
Figure Q1 (a)
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