b) Figure Q4 shows a three-line network. The load currents and the fault levels at various locations are indicated in the figure. The operation time of both the CBS 0.4 s. The IDMT relay characteristic in terms of PSM is shown in Table Q4. Assume the pickup current of relay is set to 1.5 A, the TMS for Relay 1 is 0.1 an the ratio of current transformer as below CT ratio for relay R₁ = A₁= 100/1; CT ratio for relay R₂ = A2-200/1 Determine, (1) the TMS value for Relay 2 if fault of 3000A detected at Bus C, and (ii) the actual operating time of Relay 2 if fault of 4800A found at Bus B. Bus A Over current Relay 2 PSM T (sec) Bus B 20 2.2 Transmission line: IL = 200A Max: IF = 4800 A = CB Figure Q4 Table Q4 18 16 2.6 2.8 (Relay operating time 0.7 S fuse = Over current Relay 1 14 3.0 TX TMS) Transmission Bus line: IL = 100A D Transmission line: I₁ = 100A 12 3.2 10 3.5 Bus C Max: IF - 3000 A =

b) Figure Q4 shows a three-line network. The load currents and the fault levels at various locations are indicated in the figure. The operation time of both the CBS 0.4 s. The IDMT relay characteristic in terms of PSM is shown in Table Q4. Assume the pickup current of relay is set to 1.5 A, the TMS for Relay 1 is 0.1 an the ratio of current transformer as below CT ratio for relay R₁ = A₁= 100/1; CT ratio for relay R₂ = A2-200/1 Determine, (1) the TMS value for Relay 2 if fault of 3000A detected at Bus C, and (ii) the actual operating time of Relay 2 if fault of 4800A found at Bus B. Bus A Over current Relay 2 PSM T (sec) Bus B 20 2.2 Transmission line: IL = 200A Max: IF = 4800 A = CB Figure Q4 Table Q4 18 16 2.6 2.8 (Relay operating time 0.7 S fuse = Over current Relay 1 14 3.0 TX TMS) Transmission Bus line: IL = 100A D Transmission line: I₁ = 100A 12 3.2 10 3.5 Bus C Max: IF - 3000 A =

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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