Sel SEL-421 - Trip Logic Relay Word Bits (Sheet 1 of 2)

R.1.109
Date Code 20111215 Reference Manual SEL-421 Relay
Protection Functions
Trip Logic
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 M2P
OR R_TRIG
Z2G OR
R_TRIG 51S1
OR R_TRIG
M3P OR
R_TRIG Z3G
a
Make setting when ECOMM  N.
b
Make setting when ESOTF := Y.
c
Make setting when NUMBK := 2.
Table 1.73 Trip Logic Relay Word Bits (Sheet 1 of 2)
Name Description
RXPRM Receiver trip permission
COMPRM Communications-assisted trip permission
TRPRM Trip permission
DTR Direct transfer trip
SOTFT Switch-onto-fault trip
E3PT Three-pole trip enable
E3PT1 Circuit Breaker 1 three-pole trip enable
E3PT2 Circuit Breaker 1 three-pole trip enable
APS A-phase selected
BPS B-phase selected
CPS C-phase selected
3PS Three-phase selected
27AWI Weak infeed A-phase undervoltage
27BWI Weak infeed B-phase undervoltage
27CWI Weak infeed C-phase undervoltage
ULTRA Unlatch A-phase trip
ULTRB Unlatch B-phase trip
ULTRC Unlatch C-phase trip
ULTR Unlatch all protection trips
ATPA Assert A-phase trip
ATPB Assert B-phase trip
ATPC Assert C-phase trip
A3PT Assert three-pole trip
Table 1.72 Trip Logic Settings (Sheet 2 of 2)
Setting Description Range Default (5 A)