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5) A 160 MVA, 132/66 kV, DY-1, 3-phase transformer is to be protected against short- circuit using instantaneous overcurrent relay. Rated current of transformer on 132 kV side is 699.82 A. The magnetizing inrush current of the transformer is 8 times the rated current. The setting range of an instantaneous overcurrent relay is 400-2000% of 1 A in step of 50%. The CT ratio is 1000/1 A. The setting of an instantaneous overcurrent relay is 450% 500% 550% 600%

5) A 160 MVA, 132/66 kV, DY-1, 3-phase transformer is to be protected against short- circuit using instantaneous overcurrent relay. Rated current of transformer on 132 kV side is 699.82 A. The magnetizing inrush current of the transformer is 8 times the rated current. The setting range of an instantaneous overcurrent relay is 400-2000% of 1 A in step of 50%. The CT ratio is 1000/1 A. The setting of an instantaneous overcurrent relay is 450% 500% 550% 600%

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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5) A 160 MVA, 132/66 kV, DY-1, 3-phase transformer is to be protected against short- circuit using instantaneous overcurrent relay. Rated current of transformer on 132 kV side is 699.82 A. The magnetizing inrush current of the transformer is 8 times the rated current. The setting range of an instantaneous overcurrent relay is 400-2000% of 1 A in step of 50%. The CT ratio is 1000/1 A. The setting of an instantaneous overcurrent relay is 450% 500% 550% 600%
Transcribed Image Text:5) A 160 MVA, 132/66 kV, DY-1, 3-phase transformer is to be protected against short- circuit using instantaneous overcurrent relay. Rated current of transformer on 132 kV side is 699.82 A. The magnetizing inrush current of the transformer is 8 times the rated current. The setting range of an instantaneous overcurrent relay is 400-2000% of 1 A in step of 50%. The CT ratio is 1000/1 A. The setting of an instantaneous overcurrent relay is 450% 500% 550% 600%
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