Discrimination (Selectivity or coordination) Problem:Given the below single line diagram where, the red curve is for a PD1 circuit breaker (Upstream). The blue curve is for a PD2 circuit breaker(Down stream)SUPPLYSee the following curves to check the discrimination at the red, green and blue arrows (if the fault happened at the downstream PD2)N NOT DISCRIMINATING WITH UPSTREAM DEVICE4h2h1h30 m10 m50 s8s5s250,800 s0.500 s0.300 s200s0.080 s0.050s8838:0.010s0.0050 s0.0010sCurrent (A)The time selectivity between PD1 and PD2 if the fault happens at PD2 for a current rating coincides with green arrow isSelect one:O aAt = 47seconds1/20/22, 4:08 PMO b. At = 27secondsOc.At = 57secondsOd. At = 37secondsO e. None of theseOf At = 7secondsTripping Time

Fault is at PD2 for current rating coincides with green arrow we need to find ∆t

Given the below single line diagram where, the red curve is for a PD1 circuit breaker (Upstream). The blue curve is for a PD2 circuit breaker (Down stream) SUPPLY See the following curves to check the discrimination at the red, green and blue arrows (if the fault happened at the downstream PD2) |NOT DISCRIMINATING WITH UPSTREAM DEVICE 4h 2h 1h 30 m 20 m 10 m 3 m 2 m 50 s la1536 A 0.800 s 0.500 s 0.300 s 0.200 s 0.080 s 0.050 s 0.030s 0.020 s 0.010s 0.0050 s 0.0010s Current (A) The time selectivity between PD1 and PD2 if the fault happens at PD2 for a current rating coincides with green arrow is 000'001 000'01 000'1 Tripping Time

Given the below single line diagram where, the red curve is for a PD1 circuit breaker (Upstream). The blue curve is for a PD2 circuit breaker (Down stream) SUPPLY See the following curves to check the discrimination at the red, green and blue arrows (if the fault happened at the downstream PD2) |NOT DISCRIMINATING WITH UPSTREAM DEVICE 4h 2h 1h 30 m 20 m 10 m 3 m 2 m 50 s la1536 A 0.800 s 0.500 s 0.300 s 0.200 s 0.080 s 0.050 s 0.030s 0.020 s 0.010s 0.0050 s 0.0010s Current (A) The time selectivity between PD1 and PD2 if the fault happens at PD2 for a current rating coincides with green arrow is 000'001 000'01 000'1 Tripping Time

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter9: Unsymmetrical Faults

Section: Chapter Questions

Problem 9.54P

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