Q2. The following readings are taken from the results of an open-circuit and short-circuit tests on a three-phase, Y-connected, 100-kVA, 500V, four-pole, 60HZ turbo-generator: 25 30 Field current (A) O.C.T- VLL Voltage (kV) S.C.T- Armature current (A) 73 10 15 20 125 250 370 480 566 640 146 220 If the measured D.C armature resistance between terminals is 0.42, then Determine: I- The unsaturated synchronous impedance. II- The saturated synchronous impedance. III- The voltage regulation at rated power 0.8 leading power factor and the corresponding field current. IV- The minimum line current the generator can supply at full-load and the corresponding field current.

Q2. The following readings are taken from the results of an open-circuit and short-circuit tests on a three-phase, Y-connected, 100-kVA, 500V, four-pole, 60HZ turbo-generator: 25 30 Field current (A) O.C.T- VLL Voltage (kV) S.C.T- Armature current (A) 73 10 15 20 125 250 370 480 566 640 146 220 If the measured D.C armature resistance between terminals is 0.42, then Determine: I- The unsaturated synchronous impedance. II- The saturated synchronous impedance. III- The voltage regulation at rated power 0.8 leading power factor and the corresponding field current. IV- The minimum line current the generator can supply at full-load and the corresponding field current.

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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Concept explainers

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

Q2. The following readings are taken from the results of an open-circuit and short-cırcuit tests
on a three-phase, Y-connected, 100-kVA, 500V, four-pole, 60HZ turbo-generator:
25
30
Field current (A)
O.C.T- VLL Voltage (kV)
S.C.T- Armature current (A) 73
10
15
20
125 250
370 480 566 640
146
220
If the measured D.C armature resistance between terminals is 0.42, then
Determine:
I- The unsaturated synchronous impedance.
II- The saturated synchronous impedance.
III- The voltage regulation at rated power 0.8 leading power factor and the corresponding field current.
IV- The minimum line current the generator can supply at full-load and the corresponding field current.

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