Q3 (a) Draw the equivalent circuit for a single phase transformer with all components referred to the primary side. Give a brief description of what each circuit component represents and identify the two power loss components in a transformer. Open Circuit and Short Circuit tests were conducted on a 12V/115V single phase transformer and the following results obtained: (b) Open Circuit Test: Vp = 12V V, = 115V 1,= 2.5A Pin = 10W Short Circuit Test: Vp= 1.25V 1, = 16A Pin= 8W (i) Sketch the relevant equivalent circuit for each test and from these and the above results calculate the various equivalent circuit components and turns ratio. (ii) Determine the required secondary load resistance to operate at the maximum efficiency point at 12V input voltage. Indicate any approximations in the calculation. (iii) Determine the efficiency and voltage regulation for operation with this load resistance. (c) A 11kV/415V AA connected 3 phase transformer is constructed using 3 single phase transformers. Given each transformer has a rating of 20KVA calculate the secondary line currents, secondary transformer winding currents and determine the maximum rated VA for operation under an open delta configuration.
Q3 (a) Draw the equivalent circuit for a single phase transformer with all components referred to the primary side. Give a brief description of what each circuit component represents and identify the two power loss components in a transformer. Open Circuit and Short Circuit tests were conducted on a 12V/115V single phase transformer and the following results obtained: (b) Open Circuit Test: Vp = 12V V, = 115V 1,= 2.5A Pin = 10W Short Circuit Test: Vp= 1.25V 1, = 16A Pin= 8W (i) Sketch the relevant equivalent circuit for each test and from these and the above results calculate the various equivalent circuit components and turns ratio. (ii) Determine the required secondary load resistance to operate at the maximum efficiency point at 12V input voltage. Indicate any approximations in the calculation. (iii) Determine the efficiency and voltage regulation for operation with this load resistance. (c) A 11kV/415V AA connected 3 phase transformer is constructed using 3 single phase transformers. Given each transformer has a rating of 20KVA calculate the secondary line currents, secondary transformer winding currents and determine the maximum rated VA for operation under an open delta configuration.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Concept explainers
Three-Phase Transformers
Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.
Transformer
Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.
Question
Transcribed Image Text:Q3 (a)
Draw the equivalent circuit for a single phase transformer with all
components referred to the primary side. Give a brief description of what
each circuit component represents and identify the two power loss
components in a transformer.
(b)
Open Circuit and Short Circuit tests were conducted on a 12V/115V single
phase transformer and the following results obtained:
Open Circuit Test:
V, = 12V V, = 115V 1, = 2.5A Pin = 10W
Short Circuit Test:
Vp = 1.25V I, = 16A Pin = 8W
(i) Sketch the relevant equivalent circuit for each test and from these and
the above results calculate the various equivalent circuit components
and turns ratio.
(ii) Determine the required secondary load resistance to operate at the
maximum efficiency point at 12V input voltage. Indicate any
approximations in the calculation.
(iii) Determine the efficiency and voltage regulation for operation with this
load resistance.
(c) A 11kV/415V AA connected 3 phase transformer is constructed using 3
single phase transformers. Given each transformer has a rating of 20KVA
calculate the secondary line currents, secondary transformer winding
currents and determine the maximum rated VA for operation under an open
delta configuration.
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