L, R1 a*R2 a²L2 L, +a²L½ _Rq+a°R2 a=NIN2 a=N,IN2 Lm R. Lm: R_ Ideal (a) All elements referred to the primary side (b) Approximate equivalent circuit that is sometimes more convenient to use than that of part (a) Figure 14.29

L, R1 a*R2 a²L2 L, +a²L½ _Rq+a°R2 a=NIN2 a=N,IN2 Lm R. Lm: R_ Ideal (a) All elements referred to the primary side (b) Approximate equivalent circuit that is sometimes more convenient to use than that of part (a) Figure 14.29

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 5RQ: What are interpoles, and what is their purpose?

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Concept explainers

Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

Question

When operating with an open-circuit load and with rated primary voltage, a certain 60Hz 20-kVA 8000/240-V-rms transformer has a primary current of 0.315 A rms and absorbs 360 W. Which of the elements of the equivalent circuit of Figure 14.29(b) on page 729 can be determined from this data? Find the numerical values of these elements.

L,
R1
a*R2
a²L2
L, +a²L½ _Rq+a°R2
a=NIN2
a=N,IN2
Lm
R.
Lm:
R_
Ideal
(a) All elements referred to the primary side
(b) Approximate equivalent circuit that is sometimes more
convenient to use than that of part (a)
Figure 14.29

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why are you using the high voltage to find the open circuit angle in step 1? isnt the low voltage supposed to be applied in the open-circuit test?

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