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Ex.5: A 10 MVA transformer operate at 25% overload, feeds 11 kV busbar through circuit breakers. The 11 Kv busbars feed two outgoing feeders through other breakers. 11 kv 8 US BARR TO MVA TRANS. 飞 525/1 352/1 The CTs housed in transformer and feeder circuit breaker have ratios of 525/1 and 352/1 respectively and all sets of C.T.S feed induction type over current relays having the following characteristics for a 100% plug setting. Plug setting multiplier P.S.M seconds 3.6 5 time 10 6 3.9 2.8 2.2 2.1 10 15 20 Time in for a multiplier of 1 The relays on feeder CB have plug setting of 100% for overload and 0% on earth fault, the time multiplier setting being 0.3 in all cases. a fault occurs on one of the outgoing feeders and the fault current flows into it via transformer. Find the operating time of transformer relay if the fault is 3 phase short circuit with a fault current magnitude of 5250 A in each phase.

Ex.5: A 10 MVA transformer operate at 25% overload, feeds 11 kV busbar through circuit breakers. The 11 Kv busbars feed two outgoing feeders through other breakers. 11 kv 8 US BARR TO MVA TRANS. 飞 525/1 352/1 The CTs housed in transformer and feeder circuit breaker have ratios of 525/1 and 352/1 respectively and all sets of C.T.S feed induction type over current relays having the following characteristics for a 100% plug setting. Plug setting multiplier P.S.M seconds 3.6 5 time 10 6 3.9 2.8 2.2 2.1 10 15 20 Time in for a multiplier of 1 The relays on feeder CB have plug setting of 100% for overload and 0% on earth fault, the time multiplier setting being 0.3 in all cases. a fault occurs on one of the outgoing feeders and the fault current flows into it via transformer. Find the operating time of transformer relay if the fault is 3 phase short circuit with a fault current magnitude of 5250 A in each phase.

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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Ex.5: A 10 MVA transformer operate at 25% overload, feeds 11 kV busbar through circuit breakers. The 11 Kv busbars feed two outgoing feeders through other breakers. 11kv BUS BAR 1O MV TRANS. 一 母 525/1 352/1 The CTs housed in transformer and feeder circuit breaker have ratios of 525/1 and 352/1 respectively and all sets of C.T.S feed induction type over current relays having the following characteristics for a 100% plug setting. Plug setting multiplier P.S.M Time in seconds for 10 15 20 time 10 6 3.9 2.8 2.2 2.1 2 3.6 5 a multiplier of 1 The relays on feeder CB have plug setting of 100% for overload and 0% on earth fault, the time multiplier setting being 0.3 in all cases . a fault occurs on one of the outgoing feeders and the fault current flows into it via transformer. Find the operating time of transformer relay if the fault is 3 phase short circuit with a fault current magnitude of 5250 A in each phase.
Transcribed Image Text:Ex.5: A 10 MVA transformer operate at 25% overload, feeds 11 kV busbar through circuit breakers. The 11 Kv busbars feed two outgoing feeders through other breakers. 11kv BUS BAR 1O MV TRANS. 一 母 525/1 352/1 The CTs housed in transformer and feeder circuit breaker have ratios of 525/1 and 352/1 respectively and all sets of C.T.S feed induction type over current relays having the following characteristics for a 100% plug setting. Plug setting multiplier P.S.M Time in seconds for 10 15 20 time 10 6 3.9 2.8 2.2 2.1 2 3.6 5 a multiplier of 1 The relays on feeder CB have plug setting of 100% for overload and 0% on earth fault, the time multiplier setting being 0.3 in all cases . a fault occurs on one of the outgoing feeders and the fault current flows into it via transformer. Find the operating time of transformer relay if the fault is 3 phase short circuit with a fault current magnitude of 5250 A in each phase.
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