A potential difference of 250V is applied to a field winding at 15 C and the current 5A. What will be the mean temperature of the winding when current has fallen to 3.91A, applied voltage being constant. Assume a-1/254.5 at 15 C.

A potential difference of 250V is applied to a field winding at 15 C and the current 5A. What will be the mean temperature of the winding when current has fallen to 3.91A, applied voltage being constant. Assume a-1/254.5 at 15 C.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 8RQ

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Question

A potential difference of 250V is applied to a field winding at 15 C" and the current 5A.
What will be the mean temperature of the winding when current has fallen to 3.91A,
applied voltage being constant. Assume a=1/254.5 at 15 C°.

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