Schweitzer Engineering Laboratories SEL-421-4 - Table 5.79 Trip Logic Relay Word Bits

5.144
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Functions
Trip Logic
Table 5.79 Trip Logic Relay Word Bits
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 2 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
TPA Trip A-Phase
TPB Trip B-Phase
TPC Trip C-Phase
TRIP Trip A-Phase or B-Phase or C-Phase
3PT Three-pole trip
SPT Single-pole trip
TPA1 Circuit Breaker 1 trip A-Phase
TPB1 Circuit Breaker 1 trip B-Phase
TPC1 Circuit Breaker 1 trip C-Phase
TPA2 Circuit Breaker 2 trip A-Phase
TPB2 Circuit Breaker 2 trip B-Phase
TPC2 Circuit Breaker 2 trip C-Phase
TOP Trip during open-pole timer is asserted
ULMTR1 Circuit Breaker 1 unlatch manual trip
ULMTR2 Circuit Breaker 2 unlatch manual trip