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An OC relay having the Preset/Pickup value at 7.9 A is connected to a Current Transformer with nominal ratio =200:10 of CT, the Secondary impedance of CT is 0.092 ohm and Burden on CT is 0.9 ohm. The CT has the cross-sectional area of core to be 2.9x110-6 Cm². The current of excitation being 0.5 A and frequency of power system is 50 Hz. (Also the above CT will get saturate on the max flux density of 1.2 Tesla) (a) Solve for the E.M.F induced in the secondary of above CT. (b) Evaluate, whether the OC relay will operate or not? , when a fault current of 250 A flows in the primary line? (c) Solve the above scheme for finding the C.T saturation status (whether the CT operation is under the knee-point or beyond the knee-point of Saturation)

An OC relay having the Preset/Pickup value at 7.9 A is connected to a Current Transformer with nominal ratio =200:10 of CT, the Secondary impedance of CT is 0.092 ohm and Burden on CT is 0.9 ohm. The CT has the cross-sectional area of core to be 2.9x110-6 Cm². The current of excitation being 0.5 A and frequency of power system is 50 Hz. (Also the above CT will get saturate on the max flux density of 1.2 Tesla) (a) Solve for the E.M.F induced in the secondary of above CT. (b) Evaluate, whether the OC relay will operate or not? , when a fault current of 250 A flows in the primary line? (c) Solve the above scheme for finding the C.T saturation status (whether the CT operation is under the knee-point or beyond the knee-point of Saturation)

Introductory Circuit Analysis (13th Edition)
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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An OC relay having the Preset/Pickup value at 7.9 A is connected to a Current Transformer with nominal ratio =200:10 of CT, the Secondary impedance of CT is 0.092 ohm and Burden on CT is 0.9 ohm. The CT has the cross-sectional area of core to be 2.9x110-6 Cm². The current of excitation being 0.5 A and frequency of power system is 50 Hz. (Also the above CT will get saturate on the max flux density of 1.2 Tesla) (a) Solve for the E.M.F induced in the secondary of above CT. (b) Evaluate, whether the OC relay will operate or not? , when a fault current of 250 A flows in the primary line? (c) Solve the above scheme for finding the C.T saturation status (whether the CT operation is under the knee-point or beyond the knee-point of Saturation) (d) Solve for the error in CT ratio in percentage.
Transcribed Image Text:An OC relay having the Preset/Pickup value at 7.9 A is connected to a Current Transformer with nominal ratio =200:10 of CT, the Secondary impedance of CT is 0.092 ohm and Burden on CT is 0.9 ohm. The CT has the cross-sectional area of core to be 2.9x110-6 Cm². The current of excitation being 0.5 A and frequency of power system is 50 Hz. (Also the above CT will get saturate on the max flux density of 1.2 Tesla) (a) Solve for the E.M.F induced in the secondary of above CT. (b) Evaluate, whether the OC relay will operate or not? , when a fault current of 250 A flows in the primary line? (c) Solve the above scheme for finding the C.T saturation status (whether the CT operation is under the knee-point or beyond the knee-point of Saturation) (d) Solve for the error in CT ratio in percentage.
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