Schweitzer Engineering Laboratories SEL-421-4 - Page 422

6.86
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
345 kV Tapped Overhead Transmission Line Example
Pole-Open Detection (Group)
EPO Pole Open Detection (52, V) 52
SPOD Single Pole Open Dropout Delay (0.000–60 cycles) 0.500
3POD Three Pole Open Dropout Delay (0.000–60 cycles) 0.500
DCB Trip Scheme (Group)
Z3XPU Zone 3 Reverse Pickup Time Delay (0.000–16000 cycles) 1.000
Z3XD Zone 3 Reverse Dropout Delay (0.000–16000 cycles) 5.000
21SD Zone 2 Distance Short Delay (0.000–16000 cycles) 1.625
67SD Level 2 Overcurrent Short Delay (0.000–16000 cycles) 1.625
BT Block Trip Received (SEL
OGIC Equation) IN103
BTXD Block Trip Receive Extension Time (0.000–16000 cycles) 0.000
Trip Logic (Group)
TR Trip (SELOGIC Equation) Z1T OR Z2T OR 51S1T
TRCOMM Communications-Assisted Trip (SEL
OGIC Equation) Z2PGS OR 67QG2S
TRCOMMD Dir. Element Comms.-Assisted Trip (SEL
OGIC Equation) NA
TRSOTF Switch-Onto-Fault Trip (SEL
OGIC Equation) Z2P OR Z2G OR 50P1
DTA Direct Transfer Trip A-Phase (SEL
OGIC Equation) NA
DTB Direct Transfer Trip B-Phase (SEL
OGIC Equation) NA
DTC Direct Transfer Trip C-Phase (SEL
OGIC Equation) NA
BK1MTR Manual Trip–Breaker 1 (SEL
OGIC Equation) OC1 OR PB8_PUL
ULTR Unlatch Trip (SEL
OGIC Equation) TRGTR
ULMTR1 Unlatch Manual Trip–Breaker 1 (SEL
OGIC Equation) NOT (52AA1 AND 52AB1 AND 52AC1)
TOPD Trip During Open Pole Time Delay (2.000–8000 cycles) 2.000
TULO Trip Unlatch Option (1, 2, 3, 4) 3
Z2GTSP Zone 2 Ground Distance Time Delay For Single-Pole Tripping (Y, N) N
67QGSP Zone 2 Directional Negative-Sequence/Residual Overcurrent Single-
Pole Trip (Y, N)
N
TDUR1D Single-Pole Trip Minimum Trip Duration Time Delay (2.000–8000 cycles) 6.000
TDUR3D Three-Pole Trip Minimum Trip Duration Time Delay (2.000–8000 cycles) 9.000
E3PT Three-Pole Trip Enable (SEL
OGIC Equation) 1
E3PT1 Breaker 1 Three-Pole Trip (SEL
OGIC Equation) 1
ER Event Report Trigger (SEL
OGIC Equation) R_TRIG Z2P OR R_TRIG Z2G OR
R_TRIG 51S1 OR R_TRIG Z3P OR
R_TRIG Z3G
Main Board (Outputs)
OUT101 (SELOGIC Equation) 3PT
OUT102 (SEL
OGIC Equation) NSTRT AND NOT STOP OR DSTRT
OUT103 (SEL
OGIC Equation) STOP OR 3PT
a
Parameter n is 1 for BK1, 2 for BK2, and L for Line.
Table 6.21 Settings for 345 kV Tapped TX Example (Sheet 4 of 4)
Setting Prompt Entry