2-6. A 1000-VA, 230/115-V transformer has been tested to determine its equivalent cir- cuit. The results of the tests are shown below. Open-circuit test (on secondary side) Voc 115 V loc = 0.11 A Poc = = 3.9 W Short-circuit test (on primary side) Vsc = 17.1 V 1sc = 8.7 A Psc = 38.1 W (a) Find the equivalent circuit of this transformer referred to the low-voltage side of the transformer. (b) Find the transformer's voltage regulation at rated conditions and (1) 0.8 PF lag- ging, (2) 1.0 PF, (3) 0.8 PF leading. (c) Determine the transformer's efficiency at rated conditions and 0 8 PF lagging

2-6. A 1000-VA, 230/115-V transformer has been tested to determine its equivalent cir- cuit. The results of the tests are shown below. Open-circuit test (on secondary side) Voc 115 V loc = 0.11 A Poc = = 3.9 W Short-circuit test (on primary side) Vsc = 17.1 V 1sc = 8.7 A Psc = 38.1 W (a) Find the equivalent circuit of this transformer referred to the low-voltage side of the transformer. (b) Find the transformer's voltage regulation at rated conditions and (1) 0.8 PF lag- ging, (2) 1.0 PF, (3) 0.8 PF leading. (c) Determine the transformer's efficiency at rated conditions and 0 8 PF lagging

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 3.63P: A 23/230-kV step-up transformer feeds a three-phase transmission line, which in turn supplies 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

current? Why?
2-6. A 1000-VA, 230/115-V transformer has been tested to determine its equivalent cir-
cuit. The results of the tests are shown below.
Open-circuit test
(on secondary side)
Voc = 115 V
loc = 0.11 A
Poc = 3.9 W
Short-circuit test
(on primary side)
Vsc = 17.1 V
1sc = 8.7 A
Psc = 38.1 W
(a) Find the equivalent circuit of this transformer referred to the low-voltage side of
the transformer.
(b) Find the transformer's voltage regulation at rated conditions and (1) 0.8 PF lag-
ging, (2) 1.0 PF, (3) 0.8 PF leading.
(c) Determine the transformer's efficiency at rated conditions and 0.8 PF lagging.

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