Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN: 9781305632134
Author: J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher: Cengage Learning
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a) Interrelate the core saturation and different characteristics of over-current relay.
b) Mention the reason, how the very inverse characteristics of over current relay is obtained if the core is made to saturate at a later stage.
what is the difference between plug setting and pick up value of overcurrent relays?
Q3. In a % differential scheme, figure shown below, the two CTs have nominal ration of 100:1. The CT
errors for a through fault current of 5000 A are as following:
CT1
CT2
Ratio error:
10%
10%
Phase angle error:
5%
-5%
Compute following:
i)
The spill current of the OC relay in the spill path.
ii)
If the relay is 50% biased, examine whether relay will trip or remain stable
CT,
CT
Ir
CB
C.B.
メx
Egu inder
Ne
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