Schweitzer Engineering Laboratories SEL-421-4 - Table 8.69 DCB Trip Scheme; Table 8.70 Breaker 1 Failure Logic (and Breaker 2 Failure Logic)

8.28
SEL-421 Relay Instruction Manual Date Code 20171021
Settings
Group Settings
Make Table 8.69 settings if Group setting ECOMM := DCB.
Make Table 8.70 settings if Group settings EBFL1 := 1, 2, Y1, or Y2; or
EBFL2 := 1, 2, Y1, or Y2.
Ta b l e 8 .69 D C B Tr i p Schem e
Setting Prompt
Default
Value
Increment
Z3XPU Zone 3 Reverse Pickup Time Delay (0.000–16000 cycles) 1.000 0.125
Z3XD Zone 3 Reverse Dropout Delay (0.000–16000 cycles) 6.000 0.125
BTXD Block Trip Receive Extension Time (0.000–16000 cycles) 1.000 0.125
21SD Zone 2 Distance Short Delay (0.000–16000 cycles) 2.000 0.125
67SD Level 2 Overcurrent Short Delay (0.000–16000 cycles) 2.000 0.125
BT Block Trip Received (SEL
OGIC Equation) NA
Table 8.70 Breaker 1 Failure Logic (and Breaker 2 Failure Logic
a
) (Sheet 1 of 2)
Setting Prompt
Default Value
Increment
5 A 1 A
50FP1 Phase Fault Current Pickup—BK1
(0.50–50 A secondary) 5 A
(0.10–10 A secondary) 1 A
6.00 1.20 0.01
BFPU1 Breaker Failure Time Delay—BK1 (0.000–6000 cycles) 9.000 9.000 0.125
SPBFPU1
b
SPT Breaker Fail. Time Delay—BK1 (0.000–6000 cycles) 6.000 6.000 0.125
RTPU1 Retrip Time Delay—BK1 (0.000–6000 cycles) 3.000 3.000 0.125
RT3PPU1
b
Three-Pole Retrip Time Delay—BK1 (0.000–6000 cycles) 3.000 3.000 0.125
BFI3P1 Three-Pole Breaker Failure Initiate—BK1 (SEL
OGIC Equation) NA NA
BFIA1 A-Phase Breaker Failure Initiate—BK1 (SEL
OGIC Equation) NA NA
BFIB1 B-Phase Breaker Failure Initiate—BK1 (SEL
OGIC Equation) NA NA
BFIC1 C-Phase Breaker Failure Initiate—BK1 (SEL
OGIC Equation) NA NA
BFIDO1 Breaker Fail Initiate Dropout Delay—BK1 (0.000–1000 cycles) 1.500 1.500 0.125
BFISP1 Brkr Fail Init Seal-in Delay—BK1 (0.000–1000 cycles) 2.000 2.000 0.125
ENCBF1 No Current/Residual Current Logic—BK1 (Y, N) N N
50RP1 Residual Current Pickup—BK1
(0.25–50 A secondary) 5 A
(0.05–10 A secondary) 1 A
1.00 0.20 0.01
NPU1 No Current Brkr Fail. Delay—BK1 (0.000–6000 cycles) 12.000 12.000 0.125
BFIN1 No Current Breaker Failure Initiate—BK1 (SEL
OGIC Equation) NA NA
ELCBF1 Load Current Breaker Failure Logic—BK1 (Y, N) N N
50LP1 Phase Load Current Pickup—BK
(0.25–50 A secondary) 5 A
(0.05–10 A secondary) 1 A
0.50 0.10 0.01
LCPU1 Load Pickup Time Delay—BK1 (0.000–6000 cycles) 9.000 9.000 0.125
BFILC1 Breaker Failure Load Current Initiate—BK1 (SEL
OGIC Equation) NA NA
EFOBF1 Flashover Breaker Failure Logic—BK1 (Y, N) N N
50FO1 Flashover Current Pickup—BK1
(0.25–50 A secondary) 5 A
(0.05–10 A secondary) 1 A
0.50 0.10 0.01