An emergency power supply is required to provide a three-phase sinusoi- dal voltage source of 208 V (L-L) at a frequency of 400 Hz. The power is to be obtained from a battery consisting of cells in series, each cell hav- ing an internal voltage of 2.2 V and an internal resistance of 0.006 m. The load on the three-phase, 400-Hz system requires a fundamental fre- quency apparent power of 7.2 kVA at 0.9 power factor lagging. The in- luctance of the load is such that harmonic currents are negligible. How many cells should be connected in series to provide the required output? The switches may be regarded as ideal.

An emergency power supply is required to provide a three-phase sinusoi- dal voltage source of 208 V (L-L) at a frequency of 400 Hz. The power is to be obtained from a battery consisting of cells in series, each cell hav- ing an internal voltage of 2.2 V and an internal resistance of 0.006 m. The load on the three-phase, 400-Hz system requires a fundamental fre- quency apparent power of 7.2 kVA at 0.9 power factor lagging. The in- luctance of the load is such that harmonic currents are negligible. How many cells should be connected in series to provide the required output? The switches may be regarded as ideal.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter18: Resistive-inductive Parallel Circuits

Section: Chapter Questions

Problem 1PA: Incandescent lighting of 500 W is connected in parallel with an inductive load. A clamp-on ammeter...

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