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T1 transformer full load current, inrush current and damage points. Customer transformer full load current, inrush current and damage points. Initial relay setting criteria (50A, 50B, 51): At the feeder breaker, the 50 A is set for the fault current at 1 km. 50 B is set for the fault current at the recloser. At the recloser, the 50 A (high set) element pickup is set for 4 times customer transformer inrush, then rounded to the nearest 50 amps primary. 50 B is set for 2 times customer transformer inrush (rounded to nearest 50 amps). The 51 element pickup for both relays is set for 55% of the customer transformer inrush, with that value rounded to the nearest 50 amps. Time dial and curve family is specified for each relay location on results sheet. Fault currents and 51 relay operating times for faults at various points in the power system     F2          3/0 ASCR: (0.348 + j0.502) Ω/km, recloser at 2.5 km, total length 5 km, feeder voltage 7.20 kV

T1 transformer full load current, inrush current and damage points. Customer transformer full load current, inrush current and damage points. Initial relay setting criteria (50A, 50B, 51): At the feeder breaker, the 50 A is set for the fault current at 1 km. 50 B is set for the fault current at the recloser. At the recloser, the 50 A (high set) element pickup is set for 4 times customer transformer inrush, then rounded to the nearest 50 amps primary. 50 B is set for 2 times customer transformer inrush (rounded to nearest 50 amps). The 51 element pickup for both relays is set for 55% of the customer transformer inrush, with that value rounded to the nearest 50 amps. Time dial and curve family is specified for each relay location on results sheet. Fault currents and 51 relay operating times for faults at various points in the power system     F2          3/0 ASCR: (0.348 + j0.502) Ω/km, recloser at 2.5 km, total length 5 km, feeder voltage 7.20 kV

Power System Analysis and Design (MindTap Course List)
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
Chapter13: Transmission Lines: Transient Operation
Section: Chapter Questions
Problem 13.24P
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. T1 transformer full load current, inrush current and damage points.

  1. Customer transformer full load current, inrush current and damage points.
  2. Initial relay setting criteria (50A, 50B, 51):
  3. At the feeder breaker, the 50 A is set for the fault current at 1 km. 50 B is set for the fault current at the recloser.
  4. At the recloser, the 50 A (high set) element pickup is set for 4 times customer transformer inrush, then rounded to the nearest 50 amps primary. 50 B is set for 2 times customer transformer inrush (rounded to nearest 50 amps).
  5. The 51 element pickup for both relays is set for 55% of the customer transformer inrush, with that value rounded to the nearest 50 amps. Time dial and curve family is specified for each relay location on results sheet.

Fault currents and 51 relay operating times for faults at various points in the power system  

 

F2          3/0 ASCR: (0.348 + j0.502) Ω/km, recloser at 2.5 km, total length 5 km, feeder voltage 7.20 kV

Georgian T1 | Full Load Georgian T1 I inrush 25X damage (2 sec) 10X damage (9.5 sec) Customer Transformer | Full Load Customer Transformer I inrush 25X damage (2 sec) 10X damage (9.5 sec) 50A Setting - Feeder Breaker 50B Setting-Feeder Breaker 50A Setting - Recloser 50B Setting - Recloser 51 Pickup Setting Georgian B1 bus fault Customer T2 HV bushing fault Customer LV bus fault F2 relay 51P1T-U3 PU = A TD=3 F2R1 relay 51P2T-U4 PU = A TD = 3 Distance 0 km 0.5 km 1.0 km 1.5 km 2.0 km 2.5 km 3.0 km 3.5 km 4.0 km 4.5 km 5.0 km 2.5 km 3.0 km 3.5 km 4.0 km 4.5 km 5.0 km Feeder Current Calculated at 7.20kV Amps Customer LV Bus Fault Calculated at 480V Multiples Time (s)
Transcribed Image Text:Georgian T1 | Full Load Georgian T1 I inrush 25X damage (2 sec) 10X damage (9.5 sec) Customer Transformer | Full Load Customer Transformer I inrush 25X damage (2 sec) 10X damage (9.5 sec) 50A Setting - Feeder Breaker 50B Setting-Feeder Breaker 50A Setting - Recloser 50B Setting - Recloser 51 Pickup Setting Georgian B1 bus fault Customer T2 HV bushing fault Customer LV bus fault F2 relay 51P1T-U3 PU = A TD=3 F2R1 relay 51P2T-U4 PU = A TD = 3 Distance 0 km 0.5 km 1.0 km 1.5 km 2.0 km 2.5 km 3.0 km 3.5 km 4.0 km 4.5 km 5.0 km 2.5 km 3.0 km 3.5 km 4.0 km 4.5 km 5.0 km Feeder Current Calculated at 7.20kV Amps Customer LV Bus Fault Calculated at 480V Multiples Time (s)
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