Date Code 20111215 Reference Manual SEL-421 Relay
Appendix A
R.Reference Manual
Relay Word Bits
This section contains tables of the Relay Word bits available within the
SEL-421 Relay. For information on using Relay Word bits in protection and
automation, see the Applications Handbook
.
Alphabetic
Use this appendix as a reference for Relay Word bit labels in this manual and
as a resource for elements you use in
SELOGIC
control equation relay settings.
Tab le A.1 lists the Relay Word bits in alphabetic order.
Table A.1 Alphabetic List of Relay Word Bits (Sheet 1 of 21)
Name Description
Row
* Reserved
25A1BK1 Circuit Breaker 1 voltages within Synchronism Angle 1 30
25A1BK2 Circuit Breaker 2 voltages within Synchronism Angle 1 32
25A2BK1 Circuit Breaker 1 voltages within Synchronism Angle 2 31
25A2BK2 Circuit Breaker 2 voltages within Synchronism Angle 2 32
25ENBK1 Circuit Breaker 1 synchronism-check element enable 30
25ENBK2 Circuit Breaker 2 synchronism-check element enable 32
25W1BK1 Circuit Breaker 1 Angle 1 within Window 1 30
25W1BK2 Circuit Breaker 2 Angle 1 within Window 1 32
25W2BK1 Circuit Breaker 1 Angle 2 within Window 2 30
25W2BK2 Circuit Breaker 2 Angle 2 within Window 2 32
27APO A-phase undervoltage, pole open 70
27AWI A-phase undervoltage condition 50
27BPO B-phase undervoltage, pole open 70
27BWI B-phase undervoltage condition 50
27CPO C-phase undervoltage, pole open 71
27CWI C-phase undervoltage condition 50
2POBK1 Two poles open Circuit Breaker 1 40
2POBK2 Two poles open Circuit Breaker 2 40
32GF Forward ground directional element 22
32GR Reverse ground directional element 22
32IE 32I internal enable 21
32QE 32Q internal enable 21
32QF Forward negative-sequence overcurrent directional
declaration
20
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