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In the following power system all bus voltages are 6.9 kV 2 R12 1974/197 (0.07 + j1)Ω 1₁ = 120A R23 (0.5+ j6)Ω 1₁ = 120A Distance relay R₁2 provides primary protection to line 1-2 while distance relay R23 provides primary protection to line 2-3. Both are of mho type. Maximum loads at buses 2 and 3 are shown. Available CT ratios are N:5 with N value 50, 75, 100, 150, 200, 250, 300, 400, 500, 600, 800, 1000, 1200, 1500, 1600, 2000, 2400, 2500 For both relays the voltage transformer ratio is 6900:120. (a) What turns ratios should be used for R₁2 and R₂3? Assume that the secondary current should not exceed 5.2 A under maximum load. (b) What is the Zone 1 setting of relay R₂3? (c) What is the Zone 3 setting of relay R₁2?

In the following power system all bus voltages are 6.9 kV 2 R12 1974/197 (0.07 + j1)Ω 1₁ = 120A R23 (0.5+ j6)Ω 1₁ = 120A Distance relay R₁2 provides primary protection to line 1-2 while distance relay R23 provides primary protection to line 2-3. Both are of mho type. Maximum loads at buses 2 and 3 are shown. Available CT ratios are N:5 with N value 50, 75, 100, 150, 200, 250, 300, 400, 500, 600, 800, 1000, 1200, 1500, 1600, 2000, 2400, 2500 For both relays the voltage transformer ratio is 6900:120. (a) What turns ratios should be used for R₁2 and R₂3? Assume that the secondary current should not exceed 5.2 A under maximum load. (b) What is the Zone 1 setting of relay R₂3? (c) What is the Zone 3 setting of relay R₁2?

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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In the following power system all bus voltages are 6.9 kV 2 (0.07 + j1)Ω R12 I₁ = 120A I₁=120A Distance relay R₁2 provides primary protection to line 1-2 while distance relay R23 provides primary protection to line 2-3. Both are of mho type. Maximum loads at buses 2 and 3 are shown. Available CT ratios are N:5 with N value 50, 75, 100, 150, 200, 250, 300, 400, 500, 600, 800, 1000, 1200, 1500, 1600, 2000, 2400, 2500 For both relays the voltage transformer ratio is 6900:120. (a) What turns ratios should be used for R₁2 and R₂3? Assume that the secondary current should not exceed 5.2 A under maximum load. (b) What is the Zone 1 setting of relay R₂3? (c) What is the Zone 3 setting of relay R₁2 ? R23 (0.5+ j6)Ω 3
Transcribed Image Text:In the following power system all bus voltages are 6.9 kV 2 (0.07 + j1)Ω R12 I₁ = 120A I₁=120A Distance relay R₁2 provides primary protection to line 1-2 while distance relay R23 provides primary protection to line 2-3. Both are of mho type. Maximum loads at buses 2 and 3 are shown. Available CT ratios are N:5 with N value 50, 75, 100, 150, 200, 250, 300, 400, 500, 600, 800, 1000, 1200, 1500, 1600, 2000, 2400, 2500 For both relays the voltage transformer ratio is 6900:120. (a) What turns ratios should be used for R₁2 and R₂3? Assume that the secondary current should not exceed 5.2 A under maximum load. (b) What is the Zone 1 setting of relay R₂3? (c) What is the Zone 3 setting of relay R₁2 ? R23 (0.5+ j6)Ω 3
Relay setting guideline summary from Horowitz and Phadke Instantaneous overcurrent relay (1.35) I, x≤1 pu≤(0.9) 1 nogo,max If I>I the relay trips "instantly." pu Inverse, time-delay overcurrent relay 21 <I < I load,max pu fault,min pu If I>I the relay trips after a delay given by corresponding TDS operating curve with "x" coordinate I/Ipu. Set TDS as low as possible while allowing for relay coordination time of 0.3-0.5 seconds. Nonpilot distance relay. Relays types: impedance, directional impedance, mho Zone 1: Z=(0.9) Zline and min TDS. Do not overlap Zone 1 of another relay. Zone 2: Z=(1.2) Zline and TDS to coordinate with Zone 1. Overlap Zone 1 of subsequent relays, but do not overlap their Zone 2. Zone 3: Z=Zline+(1.2) Z next TDS to coordinate with Zone 2. Pilot relay, directional comparison blocking (mho type) M trip (1.75)Z line M 1 block=(1.25) (M trip-Z line) go,min
Transcribed Image Text:Relay setting guideline summary from Horowitz and Phadke Instantaneous overcurrent relay (1.35) I, x≤1 pu≤(0.9) 1 nogo,max If I>I the relay trips "instantly." pu Inverse, time-delay overcurrent relay 21 <I < I load,max pu fault,min pu If I>I the relay trips after a delay given by corresponding TDS operating curve with "x" coordinate I/Ipu. Set TDS as low as possible while allowing for relay coordination time of 0.3-0.5 seconds. Nonpilot distance relay. Relays types: impedance, directional impedance, mho Zone 1: Z=(0.9) Zline and min TDS. Do not overlap Zone 1 of another relay. Zone 2: Z=(1.2) Zline and TDS to coordinate with Zone 1. Overlap Zone 1 of subsequent relays, but do not overlap their Zone 2. Zone 3: Z=Zline+(1.2) Z next TDS to coordinate with Zone 2. Pilot relay, directional comparison blocking (mho type) M trip (1.75)Z line M 1 block=(1.25) (M trip-Z line) go,min
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