Q4: (A) A 10 MVA, 132 kV transformer is connected to the end of a transmission line of surge impedance 400 Q. The transformer has an equivalent capacitance of 0.002 µF and leakage inductance of 16 H. If a wave of 1000 KV travels through the line and strikes the transformer, find the surge voltage on the transformer? (B) A circuit breaker is connected to the high voltage side of a 3-phase, 30 MVA, 132/11 KV, (Y/Y) transformer. The stray capacitance to ground is 8 nF and the magnetizing inductance is 50 H: (a) Calculate the voltage appearing across the circuit breaker contacts due to chopping the magnetizing current of the transformer at one third of its peak value, and (b) What is the value of a switching resistance required for critical damping of the transient recovery voltage?

Q4: (A) A 10 MVA, 132 kV transformer is connected to the end of a transmission line of surge impedance 400 Q. The transformer has an equivalent capacitance of 0.002 µF and leakage inductance of 16 H. If a wave of 1000 KV travels through the line and strikes the transformer, find the surge voltage on the transformer? (B) A circuit breaker is connected to the high voltage side of a 3-phase, 30 MVA, 132/11 KV, (Y/Y) transformer. The stray capacitance to ground is 8 nF and the magnetizing inductance is 50 H: (a) Calculate the voltage appearing across the circuit breaker contacts due to chopping the magnetizing current of the transformer at one third of its peak value, and (b) What is the value of a switching resistance required for critical damping of the transient recovery voltage?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.

Question

Q4: (A) A 10 MVA, 132 kV transformer is connected to the end of a transmission line of surge
impedance 400 Q. The transformer has an equivalent capacitance of 0.002 µF and leakage
inductance of 16 H. If a wave of 1000 KV travels through the line and strikes the transformer,
find the surge voltage on the transformer?
(B) A circuit breaker is connected to the high voltage side of a 3-phase, 30 MVA, 132/11 KV,
(Y/Y) transformer. The stray capacitance to ground is 8 nF and the magnetizing inductance is
50 H:
(a) Calculate the voltage appearing across the circuit breaker contacts due to chopping the
magnetizing current of the transformer at one third of its peak value, and (b) What is the
value of a switching resistance required for critical damping of the transient recovery voltage?

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