2. A 250 kVA, 480 V, 50 Hz, delta-connected alternator with a rated field current of 5 A was tested and the following test data were obtained: • Open circuit terminal voltage from OC test data is 540 V at the rated IF. Short circuit current from SC test data is 300 A at the rated If. •A dc current of 20A is flowing through any two stator armature terminals, when a DC voltage of 10 V was applied to two of the terminals. Evaluate the following from above tests data the armature resistance, the approximate synchronous reactance and voltage regulation at rated load and 0.7 pf lead.
2. A 250 kVA, 480 V, 50 Hz, delta-connected alternator with a rated field current of 5 A was tested and the following test data were obtained: • Open circuit terminal voltage from OC test data is 540 V at the rated IF. Short circuit current from SC test data is 300 A at the rated If. •A dc current of 20A is flowing through any two stator armature terminals, when a DC voltage of 10 V was applied to two of the terminals. Evaluate the following from above tests data the armature resistance, the approximate synchronous reactance and voltage regulation at rated load and 0.7 pf lead.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
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Chapter1: Introduction
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Transcribed Image Text:2. A 250 kVA, 480 V, 50 Hz, delta-connected alternator with a rated field current of 5 A was tested and the
following test data were obtained:
• Open circuit terminal voltage from OC test data is 540 V at the rated IF.
• Short circuit current from SC test data is 300 A at the rated IF.
• A dc current of 20A is flowing through any two stator armature terminals, when a DC voltage of 10
V was applied to two of the terminals.
Evaluate the following from above tests data the armature resistance, the approximate synchronous
reactance and voltage regulation at rated load and 0.7 pf lead.
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