R.A.32
SEL-421 Relay Reference Manual Date Code 20111215
Relay Word Bits
Row List
45 DTR Direct transfer trip received
45 SOTFT Switch-onto-fault trip
45 E3PT Three-pole trip enable
45 E3PT1 Circuit Breaker 1 three-pole trip enable
45 E3PT2 Circuit Breaker 2 three-pole trip enable
46 APS Trip logic A-phase selected
46 BPS Trip logic B-phase selected
46 CPS Trip logic C-phase selected
46 3PS Trip logic three-phase selected
46 ATPA Assert Trip A
46 ATPB Assert Trip B
46 ATPC Assert Trip C
46 A3PT Assert three-pole trip
47 TPA Trip A
47 TPB Trip B
47 TPC Trip C
47 TRIP Trip A or Trip B or Trip C
47 3PT Three-pole trip
47 SPT Single-pole trip
47 TPA1 Circuit Breaker 1 Trip A
47 TPB1 Circuit Breaker 1 Trip B
48 TPC1 Circuit Breaker 1 Trip C
48 TPA2 Circuit Breaker 2 Trip A
48 TPB2 Circuit Breaker 2 Trip B
48 TPC2 Circuit Breaker 2 Trip C
48 TOP Trip during open pole timer is asserted
48 ULTR Unlatch all protection trips
48 ULMTR1 Circuit Breaker 1 unlatch manual trip
48 ULMTR2 Circuit Breaker 2 unlatch manual trip
49 ULTRA Unlatch Trip A
49 ULTRB Unlatch Trip B
49 ULTRC Unlatch Trip C
49 DTA Direct transfer trip A-Phase (SEL
OGIC control equation)
49 DTB Direct transfer trip B-Phase (SEL
OGIC control equation)
49 DTC Direct transfer trip C-Phase (SEL
OGIC control equation)
49 * Reserved
49 * Reserved
Table A.11 Relay Word Bits: Trip Logic Elements (Sheet 2 of 2)
Row Name Description
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