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(Q.2 ) Line impedances of the following power system are, Z12 = Z23 = (5+j50) and Z24 = (4+j60) 2. R12 and R32 are directional impedance relays that control the breakers B12 and B32 respectively. Zone 1 of R12 is set to protect 70% of line 1-2, Zone 2 of R12 is set to protect 110% of line 1-2 and Zone 3 of R12 %3D is set to protect 100% of line 1-2 plus 110% of line 2-4. Find the possible largest ratio of (I32/I12) for R12 relay to see the fault at bus 4. 21 Rs2 3 1 R12 B12 B32

(Q.2 ) Line impedances of the following power system are, Z12 = Z23 = (5+j50) and Z24 = (4+j60) 2. R12 and R32 are directional impedance relays that control the breakers B12 and B32 respectively. Zone 1 of R12 is set to protect 70% of line 1-2, Zone 2 of R12 is set to protect 110% of line 1-2 and Zone 3 of R12 %3D is set to protect 100% of line 1-2 plus 110% of line 2-4. Find the possible largest ratio of (I32/I12) for R12 relay to see the fault at bus 4. 21 Rs2 3 1 R12 B12 B32

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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(Q.2 ) Line impedances of the following power system are, Z12 Z23 = (5+j50) 2 and Z24 (4+j60) 2. R12 and R32 are directional impedance relays that control the breakers B12 and B32 respectively. Zone 1 of R12 is set to protect 70% of line 1-2, Zone 2 of R12 is set to protect 110% of line 1-2 and Zone 3 ofR12 is set to protect 100% of line 1-2 plus 110% of line 2-4. Find the %3D possible largest ratio of (I32/I12) for R12 relay to see the fault at bus 4. 21 R32 3 1 R12 B12 B32
Transcribed Image Text:(Q.2 ) Line impedances of the following power system are, Z12 Z23 = (5+j50) 2 and Z24 (4+j60) 2. R12 and R32 are directional impedance relays that control the breakers B12 and B32 respectively. Zone 1 of R12 is set to protect 70% of line 1-2, Zone 2 of R12 is set to protect 110% of line 1-2 and Zone 3 ofR12 is set to protect 100% of line 1-2 plus 110% of line 2-4. Find the %3D possible largest ratio of (I32/I12) for R12 relay to see the fault at bus 4. 21 R32 3 1 R12 B12 B32
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