6.52
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
500 kV Parallel Transmission Lines With Mutual Coupling Example
Trip Logic (Group)
TR Trip (SELOGIC Equation) Z1T OR Z2T OR
51S1T
TRCOMM Communications-Assisted Trip (SEL
OGIC Equation) Z2G OR Z2P
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) RMB3A
DTB Direct Transfer Trip B-Phase
(SEL
OGIC control equation)
RMB4A
DTC Direct Transfer Trip C-Phase (SEL
OGIC Equation) RMB5A
BK1MTR Manual Trip—Breaker 1 (SEL
OGIC Equation) OC1 OR PB7_PUL
BK2MTR Manual Trip—Breaker 2 (SEL
OGIC Equation) OC2 OR PB8_PUL
ULTR Unlatch Trip (SEL
OGIC Equation) TRGTR
ULMTR1 Unlatch Manual Trip—Breaker 1
(SEL
OGIC Equation)
NOT (52AA1AND
52AB1 AND
52AC1)
ULMTR2 Unlatch Manual Trip—Breaker 2
(SEL
OGIC Equation)
NOT (52AA2 AND
52AB2 AND
52AC2)
TOPD Trip During Open Pole Time Delay
(2.000–8000 cycles)
215.000
TULO Trip Unlatch Option (1, 2, 3, 4) 3
Z2GTSP Zone 2 Ground Distance Time Delay SPT (Y, N) N
67QGSP Zone 2 Directional Neg.-Seq./Residual Ground
Overcurrent SPT (Y, N)
N
TDUR1D SPT Minimum Trip Duration Time Delay
(2.000–8000 cycles)
9.000
TDUR3D 3PT Minimum Trip Duration Time Delay
(2.000–8000 cycles)
9.000
E3PT Three-Pole Trip Enable (SEL
OGIC Equation) IN107 OR TOP
E3PT1 Breaker 1 3PT (SEL
OGIC Equation) IN107
E3PT2 Breaker 2 3PT (SEL
OGIC Equation) IN107
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) TPA1
OUT102 (SEL
OGIC Equation) TPB1
OUT103 (SEL
OGIC Equation) TPC1
OUT104 (SEL
OGIC Equation) TPA2
OUT105 (SEL
OGIC Equation) TPB2
OUT106 (SEL
OGIC Equation) TPC2
Table 6.13 Settings for 500 kV Parallel TX Example (Sheet 6 of 7)
Setting Prompt Entry
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