A single-phase transformer used for street lighting(high-pressure sodium discharge lamps) converts 6 kVto 230 V (to load) with an efficiency of 0.95. Assumingpf = 0.8 and the primary apparent power is 30 kVA,finda. The secondary current.b. The transformer’s ratio.

A single-phase transformer used for street lighting(high-pressure sodium discharge lamps) converts 6 kVto 230 V (to load) with an efficiency of 0.95. Assumingpf = 0.8 and the primary apparent power is 30 kVA,finda. The secondary current.b. The transformer’s ratio.

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 3.57P: A two-winding single-phase transformer rated 60kVA,240/1200V,60Hz, has an efficiency of 0.96 when...

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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

A single-phase transformer used for street lighting
(high-pressure sodium discharge lamps) converts 6 kV
to 230 V (to load) with an efficiency of 0.95. Assuming
pf = 0.8 and the primary apparent power is 30 kVA,
find
a. The secondary current.
b. The transformer’s ratio.

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