A single-phase transformer bank has a rating of 30 MVA, 132kV/33 kV. By referring to the standard current transformer (CT) ratio in Table Q2, design a differential protection scheme for the protection of the transformer against internal fault. In the event of an internal fault in the transformer, 250 A of current flows through the high voltage (HV) side, while 750 A flows through the low voltage (LV) side. By evaluating this phenomena, justify whether the differential relay may or may not cause the circuit breaker to trip. (State any assumptions made) 50:5 450:5 1500:5 4000:5 100:5 500:5 1600:5 5000:5 150:5 600:5 2000:5 6000:5 Table Q2 CT Ratios 200:5 800:5 2400:5 250:5 900:5 2500:5 300:5 1000:5 3000:5 400:5 1200:5 3200:5

A single-phase transformer bank has a rating of 30 MVA, 132kV/33 kV. By referring to the standard current transformer (CT) ratio in Table Q2, design a differential protection scheme for the protection of the transformer against internal fault. In the event of an internal fault in the transformer, 250 A of current flows through the high voltage (HV) side, while 750 A flows through the low voltage (LV) side. By evaluating this phenomena, justify whether the differential relay may or may not cause the circuit breaker to trip. (State any assumptions made) 50:5 450:5 1500:5 4000:5 100:5 500:5 1600:5 5000:5 150:5 600:5 2000:5 6000:5 Table Q2 CT Ratios 200:5 800:5 2400:5 250:5 900:5 2500:5 300:5 1000:5 3000:5 400:5 1200:5 3200:5

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

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

A single-phase transformer bank has a rating of 30 MVA, 132kV/33 kV. By referring to the
standard current transformer (CT) ratio in Table Q2, design a differential protection scheme
for the protection of the transformer against internal fault. In the event of an internal fault in
the transformer, 250 A of current flows through the high voltage (HV) side, while 750 A flows
through the low voltage (LV) side. By evaluating this phenomena, justify whether the
differential relay may or may not cause the circuit breaker to trip. (State any assumptions
made)
50:5
450:5
1500:5
4000:5
100:5
500:5
1600:5
5000:5
150:5
600:5
2000:5
6000:5
Table Q2
CT Ratios
200:5
800:5
2400:5
250:5
900:5
2500:5
300:5
1000:5
3000:5
400:5
1200:5
3200:5

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