A single-phase 1,000 VA, 230/115 V transformer has been tested to determine its equivalent circuit. The results of the tests are shown in Table. 1. All the data given in the Table. 1 were taken from the primary (high voltage) side of the transformer. a) Find the equivalent circuit of this transformer referred to the low-voltage side of the transformer b) Neglecting magnetizing impedance, find the transformer’s voltage regulation at rated conditions and i) 0.8 power factor lagging ii) 1.0 power factor iii) 0.8 power factor leading c) Including magnetizing impedance, determine the transformer’s efficiency at rated conditions and 0.8 power factor lagging. Table 1. Open-circuit test Short-circuit test VOC = 230 V IOC = 0:45 A POC = 30 W VSC = 19:1 V ISC = 8:7 A PSC = 42:3 W
A single-phase 1,000 VA, 230/115 V transformer has been tested to determine its equivalent circuit. The results of the tests are shown in Table. 1. All the data given in the Table. 1 were taken from the primary (high voltage) side of the transformer. a) Find the equivalent circuit of this transformer referred to the low-voltage side of the transformer b) Neglecting magnetizing impedance, find the transformer’s voltage regulation at rated conditions and i) 0.8 power factor lagging ii) 1.0 power factor iii) 0.8 power factor leading c) Including magnetizing impedance, determine the transformer’s efficiency at rated conditions and 0.8 power factor lagging. Table 1. Open-circuit test Short-circuit test VOC = 230 V IOC = 0:45 A POC = 30 W VSC = 19:1 V ISC = 8:7 A PSC = 42:3 W
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 3.9P
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Question
A single-phase 1,000 VA, 230/115 V transformer has been tested to determine its equivalent circuit. The results of the tests are shown in Table. 1. All the data given in the Table. 1 were taken from the primary (high voltage) side of the transformer.
a) Find the equivalent circuit of this transformer referred to the low-voltage side of the transformer
b) Neglecting magnetizing impedance, find the transformer’s voltage regulation at rated conditions and
i) 0.8 power factor lagging
ii) 1.0 power factor
iii) 0.8 power factor leading
c) Including magnetizing impedance, determine the transformer’s efficiency at rated conditions
and 0.8 power factor lagging.
Table 1.
| Open-circuit test | Short-circuit test |
| VOC = 230 V IOC = 0:45 A POC = 30 W |
VSC = 19:1 V ISC = 8:7 A PSC = 42:3 W |
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