A 3-phase, 4-pole, 50 Hz, 380 V, 180 kVA and Y-connected cylindrical rotor synchronous generator has the test results as given below: Open circuit test: The rotor is rotated by a prime mover at 1500 rpm and the field current is adjusted to 3 A and armature terminals are open-circuited. The armature terminal voltage between two phases is measured as 380 V. Short circuit test: The rotor is rotated by a prime mover at 1500 rpm and the field current is adjusted to 3 A and armature terminals are short-circuited. The armature current is measured as 250 A. Winding resistance test: DC voltage of 5 V is applied between two of the armature terminals and the DC current of 10 A is measured. Rotational and core losses are totally 1500 W.

A 3-phase, 4-pole, 50 Hz, 380 V, 180 kVA and Y-connected cylindrical rotor synchronous generator has the test results as given below: Open circuit test: The rotor is rotated by a prime mover at 1500 rpm and the field current is adjusted to 3 A and armature terminals are open-circuited. The armature terminal voltage between two phases is measured as 380 V. Short circuit test: The rotor is rotated by a prime mover at 1500 rpm and the field current is adjusted to 3 A and armature terminals are short-circuited. The armature current is measured as 250 A. Winding resistance test: DC voltage of 5 V is applied between two of the armature terminals and the DC current of 10 A is measured. Rotational and core losses are totally 1500 W.

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

A 3-phase, 4-pole, 50 Hz, 380 V, 180 kVA and Y-connected cylindrical rotor synchronous generator has the
test results as given below:
Open circuit test: The rotor is rotated by a prime mover at 1500 rpm and the field current is adjusted to 3 A
and armature terminals are open-circuited. The armature terminal voltage between two phases is measured
as 380 V.
Short circuit test: The rotor is rotated by a prime mover at 1500 rpm and the field current is adjusted to 3 A
and armature terminals are short-circuited. The armature current is measured as 250 A.
Winding resistance test: DC voltage of 5 V is applied between two of the armature terminals and the DC
current of 10 A is measured.
Rotational and core losses are totally 1500 W.

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