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2. A 200-kVA, 480-V, 50-Hz, Y-connected synchronous generator with a rated field current of 5 A was tested, and the following data were taken: Vr,ocat the rated I was measured to be 540 V. IL,SC at the rated IF was found to be 300 A. When a dc voltage of 10 V was applied to two of the terminals, a current of 25 A was measured. a. Find the values of the armature resistance and the approximate synchronous reactance in ohms that would be used in the generator model at the rated conditions. b. Assume a 200-kVA, 480-V, 50-Hz, generator is now A-connected and tested with the same data as in a.), and yielded the same test results. Re-calculate the new values of the armature resistance and the approximate synchronous reactance in ohms. c. Compare the values calculated in a.) to the values calculated in b.). How do they compare?

2. A 200-kVA, 480-V, 50-Hz, Y-connected synchronous generator with a rated field current of 5 A was tested, and the following data were taken: Vr,ocat the rated I was measured to be 540 V. IL,SC at the rated IF was found to be 300 A. When a dc voltage of 10 V was applied to two of the terminals, a current of 25 A was measured. a. Find the values of the armature resistance and the approximate synchronous reactance in ohms that would be used in the generator model at the rated conditions. b. Assume a 200-kVA, 480-V, 50-Hz, generator is now A-connected and tested with the same data as in a.), and yielded the same test results. Re-calculate the new values of the armature resistance and the approximate synchronous reactance in ohms. c. Compare the values calculated in a.) to the values calculated in b.). How do they compare?

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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2. A 200-kVA, 480-V, 50-Hz, Y-connected synchronous generator with a rated field current of 5 A was tested, and the following data were taken: ➤ Vr,ocat the rated I was measured to be 540 V. IL,SC at the rated IF was found to be 300 A. ➤ When a dc voltage of 10 V was applied to two of the terminals, a current of 25 A was measured. a. Find the values of the armature resistance and the approximate synchronous reactance in ohms that would be used in the generator model at the rated conditions. b. Assume a 200-kVA, 480-V, 50-Hz, generator is now A-connected and tested with the same data as in a.), and yielded the same test results. Re-calculate the new values of the armature resistance and the approximate synchronous reactance in ohms. c. Compare the values calculated in a.) to the values calculated in b.). How do they compare?
Transcribed Image Text:2. A 200-kVA, 480-V, 50-Hz, Y-connected synchronous generator with a rated field current of 5 A was tested, and the following data were taken: ➤ Vr,ocat the rated I was measured to be 540 V. IL,SC at the rated IF was found to be 300 A. ➤ When a dc voltage of 10 V was applied to two of the terminals, a current of 25 A was measured. a. Find the values of the armature resistance and the approximate synchronous reactance in ohms that would be used in the generator model at the rated conditions. b. Assume a 200-kVA, 480-V, 50-Hz, generator is now A-connected and tested with the same data as in a.), and yielded the same test results. Re-calculate the new values of the armature resistance and the approximate synchronous reactance in ohms. c. Compare the values calculated in a.) to the values calculated in b.). How do they compare?
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