Sel SEL-421 - DCB Trip Scheme; Breaker 1 Failure Logic (and Breaker 2 Failure Logic

R.10.28
SEL-421 Relay Reference Manual Date Code 20111215
Settings
Group Settings
Make Table 10.60 settings if Group setting ECOMM := DCB.
Make Table 10.61 settings if Group settings EBFL1 := 1 or 2, or EBFL2 := 1
or 2.
Tabl e 1 0 .60 DC B Tri p Sc h eme
Label Prompt Default Value
Z3XPU Zone 3 Reverse Pickup Time Delay
(0.000–16000 cycles)
1.000
Z3XD Zone 3 Reverse Dropout Delay (0.000–16000 cycles) 6.000
BTXD Block Trip Receive Extension Time
(0.000–16000 cycles)
1.000
21SD Zone 2 Distance Short Delay (0.000–16000 cycles) 2.000
67SD Level 2 Overcurrent Short Delay
(0.000–16000 cycles)
2.000
BT Block Trip Received (SEL
OGIC Equation) NA
Table 10.61 Breaker 1 Failure Logic (and Breaker 2 Failure Logic
a
)
(Sheet 1 of 2)
Default Value
Label Prompt 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
BFPU1 Breaker Failure Time Delay—BK1
(0.000–6000 cycles)
9.000 9.000
SPBFPU1
b
Single-Pole Trip Breaker Failure Time Delay—BK1
(0.000–6000 cycles)
6.000 6.000
RTPU1 Retrip Time Delay—BK1 (0.000–6000 cycles) 3.000 3.000
RT3PPU1
b
Three-Pole Retrip Time Delay—BK1
(0.000–6000 cycles)
3.000 3.000
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
BFISP1 Breaker Fail Initiate Seal-in Delay—BK1
(0.000–1000 cycles)
2.000 2.000
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
NPU1 No Current Breaker Failure Delay—BK1
(0.000–6000 cycles)
12.000 12.000
BFIN1 No Current Breaker Failure Initiate—BK1
(SEL
OGIC Equation)
NA NA