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, CB CT C.B. Egu inder ieclion No

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
Chapter7: Symmetrical Faults
Section: Chapter Questions
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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
Transcribed Image Text: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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