Answered: A 3 phase 4MVA, 12 kV star connected synchronous generator has Zs= 0.8+J30 ohm. Using circle diagram only, find: 1. The output power developed at unity power…

Introductory Circuit Analysis (13th Edition)

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ISBN: 9780133923605

Author: Robert L. Boylestad

Publisher: PEARSON

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Question

A 3 phase 4MVA, 12 kV star connected synchronous generator has Zs= 0.8+J30 ohm. Using circle diagram only, find: 1. The output power developed at unity power factor with excitation equal to 1.25 of rated voltage. 2. The load angle and power factor if the generator supplies (1500 KW) at rated voltage and excitation lequal to (1.2) of rated voltage. 3. Repeat part (2) when .armature resistance is neglected

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H.W Q1) A four pole, three-phase synchronous generator is rated 250 MVA, its terminal voltage is 24 kV, the synchronous reactance is: 125%. ERI • Calculate the synchronous reactance in ohm. Calculate the rated current and the line to ground terminal voltage. Draw the equivalent circuit. • Calculate the induced voltage, E., at rated load and pf = 0.8 lag.
A 3-phase, 50 Hz, 16 pole generator with concentrated windings has 144 slots with 10 conductors per slot. The flux/pole of 24.8 mWb is sinusoidally distributed. The coil is full pitched. Find the line emf.
Calculate the per unit impedance of a three-phase generator with a power rating of 900 KVA and voltage rating of 33 KV. The generator has an armature resistance of 40 Ohms per phase and a synchronous reactance of 140 Ohms per phase.

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