3. A 3-0 star-connected alternator is rated at 1600 kVA, 13,500 V. The armature effecti resistance and synchronous reactance are 1.5 2 and 30 2 respectively per phase. Calcula the percentage regulation for a load of 1280 kW at power factors of (a) 0.8 leading ar (b)0.8 lagging. 4. Determine the voltage regulation of a 2,000-V, 1-phase alternator givinga current of 100 A 0.8 p.f. leading from the test results. Full-load current of 100 A is produced on short-circuitI a field excitation of 2.5 A. An e.m.f. of 500 V is produced on open-circuit by the san excitation. The armature resistance is 0.8 Q. Draw the vector diagram. [(a) –11.8% (b) 18.6% |- 8.9%
3. A 3-0 star-connected alternator is rated at 1600 kVA, 13,500 V. The armature effecti resistance and synchronous reactance are 1.5 2 and 30 2 respectively per phase. Calcula the percentage regulation for a load of 1280 kW at power factors of (a) 0.8 leading ar (b)0.8 lagging. 4. Determine the voltage regulation of a 2,000-V, 1-phase alternator givinga current of 100 A 0.8 p.f. leading from the test results. Full-load current of 100 A is produced on short-circuitI a field excitation of 2.5 A. An e.m.f. of 500 V is produced on open-circuit by the san excitation. The armature resistance is 0.8 Q. Draw the vector diagram. [(a) –11.8% (b) 18.6% |- 8.9%
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter31: Three-phase Alternators
Section: Chapter Questions
Problem 1RQ: What conditions must be met before two alternators can be paralleled together?
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![3. A 3-0 star-connected alternator is rated at 1600 kVA, 13,500 V. The armature effective
resistance and synchronous reactance are 1.5 2 and 30 2 respectively per phase. Calculate
the percentage regulation for a load of 1280 kW at power factors of (a) 0.8 leading and
(b)0.8 lagging.
4. Determine the voltage regulation of a 2,000-V, 1-phase alternator givinga current of 100 A at
0.8 p.f. leading from the test results. Full-load current of 100 A is produced on short-circuit by
a field excitation of 2.5 A. An e.m.f. of 500 V is produced on open-circuit by the same
excitation. The armature resistance is 0.8 Q. Draw the vector diagram.
[(a) –11.8% (b) 18.6%]
|- 8,9%]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F559b1035-b46a-467e-8227-9a2c5921ac3b%2F42229216-a21a-407d-aec0-b29e65ed39db%2Fk9cztpd_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3. A 3-0 star-connected alternator is rated at 1600 kVA, 13,500 V. The armature effective
resistance and synchronous reactance are 1.5 2 and 30 2 respectively per phase. Calculate
the percentage regulation for a load of 1280 kW at power factors of (a) 0.8 leading and
(b)0.8 lagging.
4. Determine the voltage regulation of a 2,000-V, 1-phase alternator givinga current of 100 A at
0.8 p.f. leading from the test results. Full-load current of 100 A is produced on short-circuit by
a field excitation of 2.5 A. An e.m.f. of 500 V is produced on open-circuit by the same
excitation. The armature resistance is 0.8 Q. Draw the vector diagram.
[(a) –11.8% (b) 18.6%]
|- 8,9%]
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