Q2. Two relays R₁ and R₂ are connected in two sections of a feeder as shown in Figure-2. The CTS ratio 1000:5 Amp. The plug setting of relay R₁ is 100% and R₂ is 125%. The operating time characteristic of the relays is given in table: Plug Setting Multiplier (PSM) Operating Time in Seconds 1000/5A 1x port Relay R2 4 5 4 The time multiplier setting (TMS), of the relay R₁ is 0.3. The time grading scheme has a discriminative margin of 0.5s between the relays. A 3-phase short circuit fault after relay R₁ results in a fault current of 5000A. Find the actual operating times of R₁ and R₂. What is the time multiplier setting of R₂? B 2 10 5 1000/5A * foot 8 3 Relay R1 Figure-2: System network 10 20 2.8 2.4 5000 A

Q2. Two relays R₁ and R₂ are connected in two sections of a feeder as shown in Figure-2. The CTS ratio 1000:5 Amp. The plug setting of relay R₁ is 100% and R₂ is 125%. The operating time characteristic of the relays is given in table: Plug Setting Multiplier (PSM) Operating Time in Seconds 1000/5A 1x port Relay R2 4 5 4 The time multiplier setting (TMS), of the relay R₁ is 0.3. The time grading scheme has a discriminative margin of 0.5s between the relays. A 3-phase short circuit fault after relay R₁ results in a fault current of 5000A. Find the actual operating times of R₁ and R₂. What is the time multiplier setting of R₂? B 2 10 5 1000/5A * foot 8 3 Relay R1 Figure-2: System network 10 20 2.8 2.4 5000 A

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 8RQ

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