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3. An 11 Kv radial system is shown, utilizing CO-7 relay with relay characterictics given in the figure. The pf is identical for all loads, select relay settings to protect the system. 11 kV 3 2 I2. C.T.R=400/5 C.T.R = 200/5 C.T.R = 200/5 L3 = 6.75 MVA L2= 2.5 MVA L, = 4 MY Isc, = 3200 A Isc,= 3000 A Isc, = 25 Typical time curve type CO 7 over current rela 50-60 cycles 456781012 amperes Time dial setting 3 4 5 6 7 8 9 10 12 14 16 Current as a multiple of tap setting Operating time in seconds

3. An 11 Kv radial system is shown, utilizing CO-7 relay with relay characterictics given in the figure. The pf is identical for all loads, select relay settings to protect the system. 11 kV 3 2 I2. C.T.R=400/5 C.T.R = 200/5 C.T.R = 200/5 L3 = 6.75 MVA L2= 2.5 MVA L, = 4 MY Isc, = 3200 A Isc,= 3000 A Isc, = 25 Typical time curve type CO 7 over current rela 50-60 cycles 456781012 amperes Time dial setting 3 4 5 6 7 8 9 10 12 14 16 Current as a multiple of tap setting Operating time in seconds

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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3. An 11 Kv radial system is shown, utilizing CO-7 relay with relay characterictics given in the figure. The pf is identical for all loads, select relay settings to protect the system. 11 kV 3 2 I32 C.T.R= 400/5 C.T.R = 200/5 C.T.R = 200/5 L3 = 6.75 MVA L2= 2.5 MVA L, = 4 MV Isc, = 3200 A Isc,= 3000 A Isc, = 25 Typical time curve type CO-7 over current rela 50-60 cycles 45678,10 12 amperes Time dial setting 3 4 5 6 7 8 9 10 12 14 16 Current as a multiple of tap setting Operating time in seconds
Transcribed Image Text:3. An 11 Kv radial system is shown, utilizing CO-7 relay with relay characterictics given in the figure. The pf is identical for all loads, select relay settings to protect the system. 11 kV 3 2 I32 C.T.R= 400/5 C.T.R = 200/5 C.T.R = 200/5 L3 = 6.75 MVA L2= 2.5 MVA L, = 4 MV Isc, = 3200 A Isc,= 3000 A Isc, = 25 Typical time curve type CO-7 over current rela 50-60 cycles 45678,10 12 amperes Time dial setting 3 4 5 6 7 8 9 10 12 14 16 Current as a multiple of tap setting Operating time in seconds
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