In the following power system, overcurrent relay R12 is to provide primary protection to line 1-2and overcurrent relay R23 is to provide primary protection to line 2-3. For both relays the CTratio is 200:5. The min and max currents for faults on lines 1-2 and 2-3 are shown. Maximumload current is 200 A.= 1.5kAF,minR23=0.8kAF,minR12=2.7kAIF maxI=4.0kAF,max--If R12, R23 are inverse, time-delay overcurrent relays, what should their pickup current(secondary current) and time dial settings be if a minimum coordination time of 0.5 second isrequired? The relay operating characteristics are shown on the following page.

Solution- A relay is a sensing device or a protective device used for overcurrent protection. The…

Answered: (1 2 3 /E,min =1.5kA R12, IE min =0.8kA…

Engineering

Electrical Engineering

(1 2 3 /E,min =1.5kA R12, IE min =0.8kA R23 IE max =4.0kA IE.max=2.7kA

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter10: System Protection

Section: Chapter Questions

Problem 10.3P

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Question

In the following power system, overcurrent relay R12 is to provide primary protection to line 1-2
and overcurrent relay R23 is to provide primary protection to line 2-3. For both relays the CT
ratio is 200:5. The min and max currents for faults on lines 1-2 and 2-3 are shown. Maximum
load current is 200 A.
= 1.5kA
F,min
R23
=0.8kA
F,min
R12
=2.7kA
IF max
I
=4.0kA
F,max
--
If R12, R23 are inverse, time-delay overcurrent relays, what should their pickup current
(secondary current) and time dial settings be if a minimum coordination time of 0.5 second is
required? The relay operating characteristics are shown on the following page.

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