Q1/ A three phase, 500 kVA, 6600 V, 50 Hz, 6 pole, star connected synchronous motor has synchronousimpedance of J 70 ohm per phase at its normal rating, the motor is excited to give unity power factor at the inputterminals. Finda) The rated current and power factor.b) The emf behind the synchronous impedance.c) The developed torque.d) The pull out torque.e) The increase in excitation which will just permit an increase of 30% of rated torque before pulling out ofsynchronism.(45 M.)

a) Step 1:b) and c) Step 2:d) Step 3:e) Step 4:

Answered: Q1/ A three phase, 500 kVA, 6600 V, 50…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

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A 3 phase, 1500 rpm, 2200 V, star connected synchronous motor has an impedance of 0.4+j90 per phase. At some excitation 2900 V is induced in the armature. Find the maximum torque developed by motor before the motor breaks out of synchronism. Also find the load angle this time.
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A 2300-V, 3-phase, wye - connected, round rotor synchronous motor has a synchronous reactance of 3 ohms per phase and an armature resistance of0.25 ohm per phase. The motor operates on load such that the power angle is -15 degrees, and the excitation is so adjusted that the internally induced voltage is equal to the magnitude of the terminal voltage. Determine the armature current.
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