Schweitzer Engineering Laboratories SEL-421-4 - Page 665

11.49
Date Code 20171021 Instruction Manual SEL-421 Relay
Relay Word Bits
Row Lists
78 SPOA A-Phase open
78 SPOB B-Phase open
78 SPOC C-Phase open
78 SPO One or two poles open
78 3PO All three poles open
78 27APO A-Phase undervoltage, pole-open
78 27BPO B-Phase undervoltage, pole-open
79 27CPO C-Phase undervoltage, pole-open
79 * Reserved
79 * Reserved
79 * Reserved
79 * Reserved
79 * Reserved
79 * Reserved
79 * Reserved
80 52ACL1 Circuit Breaker 1, Pole A closed
80 52BCL1 Circuit Breaker 1, Pole B closed
80 52CCL1 Circuit Breaker 1, Pole C closed
80 52AAL1 Circuit Breaker 1, Pole A alarm
80 52BAL1 Circuit Breaker 1, Pole B alarm
80 52CAL1 Circuit Breaker 1, Pole C alarm
80 52AA1 Circuit Breaker 1, Pole A status
80 52AB1 Circuit Breaker 1, Pole B status
81 52AC1 Circuit Breaker 1, Pole C status
81 * Reserved
81 52ACL2 Circuit Breaker 2, Pole A closed
81 52BCL2 Circuit Breaker 2, Pole B closed
81 52CCL2 Circuit Breaker 2, Pole C closed
81 52AAL2 Circuit Breaker 2, Pole A alarm
81 52BAL2 Circuit Breaker 2, Pole B alarm
81 52CAL2 Circuit Breaker 2, Pole C alarm
82 52AA2 Circuit Breaker 2, Pole A status
82 52AB2 Circuit Breaker 2, Pole B status
82 52AC2 Circuit Breaker 2, Pole C status
82 * Reserved
82 * Reserved
82 * Reserved
82 * Reserved
82 * Reserved
Table 11.16 Relay Word Bits: 52 Status and Open-Phase Detector (Sheet 2 of 2)
Row Name Description