For a power transformer a differential protection scheme was designed as shown in Figure 1. Assume apermissible overload of 10%, and the CT ratios (CTR) are selected based on multiple of 100, and 5 A relayis used, determine:CTR1BAAIp-111 MVA 33/0.4 kVRestD1) CTR1 is2) CTR2 is..3) CT currents Ip and Is are4) The pilot current in secondary is.....OP Rest I 12tm[3 mim 3 m/!_.and.CTR2MAटि5) The interposing CTration (Matching ratio) is..6) The spell current required for tripping (assume 30% slope)............ffIsYA MatchingFig.1

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For a power transformer a differential protection scheme was designed as shown in Figure 1. Assume a permissible overload of 10%, and the CT ratios (CTR) are selected based on multiple of 100, and 5 A relay is used, determine:

For a power transformer a differential protection scheme was designed as shown in Figure 1. Assume a permissible overload of 10%, and the CT ratios (CTR) are selected based on multiple of 100, and 5 A relay is used, determine:

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

For a power transformer a differential protection scheme was designed as shown in Figure 1. Assume a
permissible overload of 10%, and the CT ratios (CTR) are selected based on multiple of 100, and 5 A relay
is used, determine:
CTR1
BAA
Ip
-11
1 MVA 33/0.4 kV
Rest
D
1) CTR1 is
2) CTR2 is..
3) CT currents Ip and Is are
4) The pilot current in secondary is.....
OP Rest I 12
t
m[3 m
im 3 m/
!_
.and.
CTR2
MA
टि
5) The interposing CTration (Matching ratio) is..
6) The spell current required for tripping (assume 30% slope)............
ff
Is
YA Matching
Fig.1

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