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A three phase 6000 V Alternator gave the following open circuit characteristic at normal speed. ted and full load currant foluing

A three phase 6000 V Alternator gave the following open circuit characteristic at normal speed. ted and full load currant foluing

Introductory Circuit Analysis (13th Edition)
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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Problem 5: A three phase 6000 V Alternator gave the following open circuit characteristic at normal speed. With the alternator short circuited and full load current folwing, the field current is 16 A. Neglecting the armature resistance and using synchronous impedance method, Determine the voltage regulation of the alternator supplying the full load of 200 KVA, at 0.8 power factor lagging. Field current in amper Terminal Voltage in volt 14 4000 18 5000 23 6000 30 7000 43 8000 gooo THENS TERMINAL VOLTS 8000 7000 6000 5000 200 4000k 18 22 26 30 34 36 42 FIELD AMPERES, I OPEN CIRCUIT CHARACTERSTICS 46 50 54
Transcribed Image Text:Problem 5: A three phase 6000 V Alternator gave the following open circuit characteristic at normal speed. With the alternator short circuited and full load current folwing, the field current is 16 A. Neglecting the armature resistance and using synchronous impedance method, Determine the voltage regulation of the alternator supplying the full load of 200 KVA, at 0.8 power factor lagging. Field current in amper Terminal Voltage in volt 14 4000 18 5000 23 6000 30 7000 43 8000 gooo THENS TERMINAL VOLTS 8000 7000 6000 5000 200 4000k 18 22 26 30 34 36 42 FIELD AMPERES, I OPEN CIRCUIT CHARACTERSTICS 46 50 54
Expert Solution
Step 1

Given data:

3-ϕ , 6000 v alternator

If=16 A

The open circuit voltage is 4700 v

The phase O.C. voltage=47003=2714 V

Full load current =200 ×10003×6000×0.8=24 A

Short circuit current corresponding to the filed current of a 16 amperes in the 24 amperes synchronous impedance.

Zs=O.C. voltageS.C. current    =271424=113 Ω

 

 

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