2.(a)(b)(1)A 100 kVA, 4000 V / 200 V, 50 Hz single-phase transformerhas 100 secondary turns. Determine:The primary and secondary currents.The number of primary turns.Three single-phase transformers are connected in Delta-Wye (A-Y) as shown in Figure 2.1. Each transformer is rated100 kVA, 2300/13800 V RMS, 50 Hz. The total three-phaseload L is 270 kVA with a power factor of 0.866 lagging. Theinput voltages are:VAB = 23000° VBC = 2300 Z-120° VCA = 2300 120°Assume that the transformers are ideal and the line-to-neutral voltage on the secondary are in phase with the inputvoltages.ABC100000100000bn (1)(ii)(iii)Figure 2.1Write the expressions of the line-to-neutral voltages VasVon}Van and then determine the line-to-line voltages Vab, Voc,Vca on the secondary.Determine the currents Ina Inb, Inc on the secondary(magnitude and phase).Determine the phase and line currents on the primary side.QUESTION 3(25 Marka)1

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(i) A 100 KVA, 4000 V / 200 V, 50 Hz single-phase transformer has 100 secondary turns. Determine: The primary and secondary currents. The number of primary turns.

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 3.26P: A bank of three single-phase transformers, each rated 30MVA,38.1/3.81kV, are connected in Y- with a...

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Concept explainers

Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

Question

2.
(a)
(b)
(1)
A 100 kVA, 4000 V / 200 V, 50 Hz single-phase transformer
has 100 secondary turns. Determine:
The primary and secondary currents.
The number of primary turns.
Three single-phase transformers are connected in Delta-
Wye (A-Y) as shown in Figure 2.1. Each transformer is rated
100 kVA, 2300/13800 V RMS, 50 Hz. The total three-phase
load L is 270 kVA with a power factor of 0.866 lagging. The
input voltages are:
VAB = 23000° VBC = 2300 Z-120° VCA = 2300 120°
Assume that the transformers are ideal and the line-to-
neutral voltage on the secondary are in phase with the input
voltages.
A
B
C
100000
100000
b
n

(1)
(ii)
(iii)
Figure 2.1
Write the expressions of the line-to-neutral voltages Vas
Von
}
Van and then determine the line-to-line voltages Vab, Voc,
Vca on the secondary.
Determine the currents Ina Inb, Inc on the secondary
(magnitude and phase).
Determine the phase and line currents on the primary side.
QUESTION 3(25 Marka)
1

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