Answered: j0.5 20 j1.500 220 V СТ PS 220/220 V…

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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Question

A radial system shown in figure below is fed from a supply of 220 Volt. All impedance values are referred to 220V side (3 phase). When a three phase fault occurs at E, relay D will operate with 0.4 second longer than relay at E. Determine TSM (Time Setting Multiple) at A, B C and D by taking discrimination time (DT) equal to 0.4 second, and TSM at C is already set equal to 0.05. The protection data is as given in figure while IDMT relay characteristic is as in table.

j6.0 2
C
j0.5 n jl.50 SN
j1.0 2
j1.0 0
E
220 V
j6.0 2
220/220 V
220/110 V
ČT
10/1
10/1
7.5/1
7.5/1
15/1
PS
150%
125%
100%
100%
100%

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