11.44
SEL-421 Relay Instruction Manual Date Code 20171021
Relay Word Bits
Row Lists
53 TRPRM Trip permission
53 DTR Direct transfer trip received
53 SOTFT Switch-onto-fault trip
53 E3PT Three-pole trip enable
53 E3PT1 Circuit Breaker 1 three-pole trip enable
53 E3PT2 Circuit Breaker 2 three-pole trip enable
54 APS Trip logic A-Phase selected
54 BPS Trip logic B-Phase selected
54 CPS Trip logic C-Phase selected
54 3PS Trip logic three-phase selected
54 ATPA Assert Trip A
54 ATPB Assert Trip B
54 ATPC Assert Trip C
54 A3PT Assert three-pole trip
55 TPA Trip A
55 TPB Trip B
55 TPC Trip C
55 TRIP Trip A or Trip B or Trip C
55 3PT Three-pole trip
55 SPT Single-pole trip
55 TPA1 Circuit Breaker 1 Trip A
55 TPB1 Circuit Breaker 1 Trip B
56 TPC1 Circuit Breaker 1 Trip C
56 TPA2 Circuit Breaker 2 Trip A
56 TPB2 Circuit Breaker 2 Trip B
56 TPC2 Circuit Breaker 2 Trip C
56 TOP Trip during open pole timer is asserted
56 ULTR Unlatch all protection trips
56 ULMTR1 Circuit Breaker 1 unlatch manual trip
56 ULMTR2 Circuit Breaker 2 unlatch manual trip
57 ULTRA Unlatch Trip A
57 ULTRB Unlatch Trip B
57 ULTRC Unlatch Trip C
57 DTA Direct transfer trip A-Phase (SEL
OGIC control equation)
57 DTB Direct transfer trip B-Phase (SEL
OGIC control equation)
57 DTC Direct transfer trip C-Phase (SEL
OGIC control equation)
57 * Reserved
57 * Reserved
Table 11.11 Relay Word Bits: Trip Logic Elements (Sheet 2 of 2)
Row Name Description
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