A three-phase synchronous generator is being used as a source of power for a farm in a remote area of Sindh. The apparent power rating of this generator is 100 KVA and the line to line voltage is 3000 V at 50 Hz. The configuration is star. When the terminals of the alternator are short-circuited, and a field current of 40 A is applied, a short circuit current of 200 A flows where when the terminals are open-circuited, with the same field current 1040 V are measured across the terminals. Calculate the voltage regulation for fully loaded conditions having the PF of both 0.8 leading as well as lagging. Use phasor diagrams. The effective armature resistance of this generator is 0.2 ohms. (Hint: Synchronous Impedance = (O.C Voltage/phase) / (S.C Current/phase))

A three-phase synchronous generator is being used as a source of power for a farm in a remote area of Sindh. The apparent power rating of this generator is 100 KVA and the line to line voltage is 3000 V at 50 Hz. The configuration is star. When the terminals of the alternator are short-circuited, and a field current of 40 A is applied, a short circuit current of 200 A flows where when the terminals are open-circuited, with the same field current 1040 V are measured across the terminals. Calculate the voltage regulation for fully loaded conditions having the PF of both 0.8 leading as well as lagging. Use phasor diagrams. The effective armature resistance of this generator is 0.2 ohms. (Hint: Synchronous Impedance = (O.C Voltage/phase) / (S.C Current/phase))

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Question

A three-phase synchronous generator is being used as a source of power for a
farm in a remote area of Sindh. The apparent power rating of this generator is
100 KVA and the line to line voltage is 3000 V at 50 Hz. The configuration is
star. When the terminals of the alternator are short-circuited, and a field current
of 40 A is applied, a short circuit current of 200 A flows where when the
terminals are open-circuited, with the same field current 1040 V are measured
across the terminals.
Calculate the voltage regulation for fully loaded conditions having the PF of
both 0.8 leading as well as lagging. Use phasor diagrams. The effective
armature resistance of this generator is 0.2 ohms.
(Hint: Synchronous Impedance = (O.C Voltage/phase) / (S.C Current/phase))

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