Three single-phase distribution transformers, each rated for 18 kVA, 20000/220 volts, are connected in a Dy three-phase bank. For convenience, at the factory, the OCT and the SCT were per- formed as per standards with the whole three-phase bank already connected and the measured values were as follows: Vline 381.051V, line = 1.78436A, P30 = 372.414 W. Vline = 5656.85 V, pline = 1.55885 A, P3 =2160 W. Three phase bank of single phase transformer on a utility pole. 37.5 K (a) Find the single phase equivalent circuit referred to the low volt- age side. (b) Find the transformer regulation at the rated load and voltage and a power factor of 0.45 lagging (Neglect the excitation current). (c) Using the "load" model, what is the approximate transformer- bank's efficiency, n, under these conditions of load?
Three single-phase distribution transformers, each rated for 18 kVA, 20000/220 volts, are connected in a Dy three-phase bank. For convenience, at the factory, the OCT and the SCT were per- formed as per standards with the whole three-phase bank already connected and the measured values were as follows: Vline 381.051V, line = 1.78436A, P30 = 372.414 W. Vline = 5656.85 V, pline = 1.55885 A, P3 =2160 W. Three phase bank of single phase transformer on a utility pole. 37.5 K (a) Find the single phase equivalent circuit referred to the low volt- age side. (b) Find the transformer regulation at the rated load and voltage and a power factor of 0.45 lagging (Neglect the excitation current). (c) Using the "load" model, what is the approximate transformer- bank's efficiency, n, under these conditions of load?
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 3.37P: Three single-phase two-winding transformers, each rated 25MVA,54.2/5.42kV, are connected to form a...
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![Three single-phase distribution transformers, each rated for 18
kVA, 20000/220 volts, are connected in a Dy three-phase bank.
For convenience, at the factory, the OCT and the SCT were per-
formed as per standards with the whole three-phase bank already
connected and the measured values were as follows:
Vline 381.051V, line 1.78436A, P30 = 372.414 W.
Vline = 5656.85 V, Iline = 1.55885 A, P30 = 2160 W.
Three phase bank of single phase transformer on a utility pole.
37.5 K
(a) Find the single phase equivalent circuit referred to the low volt-
age side.
(b) Find the transformer regulation at the rated load and voltage
and a power factor of 0.45 lagging (Neglect the excitation current).
(c) Using the "load" model, what is the approximate transformer-
bank's efficiency, n, under these conditions of load?
(a) R2 X=2
Rsc=mXsc = mS
(b) Vreg=
(c) n = %](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8e9ca648-396a-488a-88dd-91544590f068%2F9329692c-b76b-4f32-aaaa-13d135bca285%2Fn66090v_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Three single-phase distribution transformers, each rated for 18
kVA, 20000/220 volts, are connected in a Dy three-phase bank.
For convenience, at the factory, the OCT and the SCT were per-
formed as per standards with the whole three-phase bank already
connected and the measured values were as follows:
Vline 381.051V, line 1.78436A, P30 = 372.414 W.
Vline = 5656.85 V, Iline = 1.55885 A, P30 = 2160 W.
Three phase bank of single phase transformer on a utility pole.
37.5 K
(a) Find the single phase equivalent circuit referred to the low volt-
age side.
(b) Find the transformer regulation at the rated load and voltage
and a power factor of 0.45 lagging (Neglect the excitation current).
(c) Using the "load" model, what is the approximate transformer-
bank's efficiency, n, under these conditions of load?
(a) R2 X=2
Rsc=mXsc = mS
(b) Vreg=
(c) n = %
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