Schweitzer Engineering Laboratories SEL-421-4 - Page 301

5.141
Date Code 20171021 Instruction Manual SEL-421 Relay
Protection Functions
Trip Logic
TOPD Trip During Open Pole Time Delay (cycles) 2.000-8000 2.000
TULO Trip Unlatch Option 1, 2, 3, 4 3
Z2GTSP Zone 2 Ground Distance Time Delay Y, N N
67QGSP Zone 2 Direct Negative Sequence/Residual Overcurrent SPT Y, N N
TDUR1D Single-Pole Trip Minimum Trip Duration Time Delay (cycles) 2.000–8000 6.000
TDUR3D Three-Pole Trip Minimum Trip Duration Time Delay (cycles) 2.000–8000 12.000
E3PT Three-Pole Trip Enable SEL
OGIC Equation 1
E3PT1 Breaker 1 Three-Pole Trip SEL
OGIC Equation 1
E3PT2 Breaker 2 Three-Pole Trip SEL
OGIC Equation 1
ER Event Report Trigger Equation SEL
OGIC Equation R_TRIG Z2P OR R_TRIG Z2G
OR R_TRIG 51S1 OR R_TRIG
Z3P OR R_TRIG Z3G
a
Make setting when ECOMM := N.
b
Make setting when ESOTF := Y.
c
Make setting when NUMBK := 2.
Table 5.78 Trip Logic Settings (Sheet 2 of 2)
Setting Prompt Range Default (5 A)