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.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter31: Three-phase Alternators

Section: Chapter Questions

Problem 1RQ: What conditions must be met before two alternators can be paralleled together?

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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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