A synchronous generator and motor are rated for 30,000 kVA, 13.2kV and both have sub-transient reactance of 20%. The line connecting them has a reactance of 10% on the base of machine ratings. The motor is drawing 20,000kW at 0.8 pf leading. The terminal voltage of the motor is 12.8kV. When a symmetrical three-phase fault occurs at motor terminals, find the sub transient current in generator, motor and at the fault point.
A synchronous generator and motor are rated for 30,000 kVA, 13.2kV and both have sub-transient reactance of 20%. The line connecting them has a reactance of 10% on the base of machine ratings. The motor is drawing 20,000kW at 0.8 pf leading. The terminal voltage of the motor is 12.8kV. When a symmetrical three-phase fault occurs at motor terminals, find the sub transient current in generator, motor and at the fault point.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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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.
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Transcribed Image Text:A synchronous generator and motor are rated for 30,000 kVA, 13.2kV and
both have sub-transient reactance of 20%. The line connecting them has a
reactance of 10% on the base of machine ratings. The motor is drawing
20,000kW at 0.8 pf leading. The terminal voltage of the motor is 12.8kV.
When a symmetrical three-phase fault occurs at motor terminals, find the
sub transient current in generator, motor and at the fault point.
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