Date Code 20171021 Instruction Manual SEL-421 Relay
SEL-421 RelayInstruction Manual
SECTION 11
Relay Word Bits
This section contains tables of the Relay Word bits available within the SEL-421
Relay. Table 11.1 lists the Relay Word bits in alphabetic order; Table 11.2
through Table 11.73 list every Relay Word bit row and the bits contained within
each row.
Alphabetical List
Table 11.1 Alphabetic List of Relay Word Bits (Sheet 1 of 34)
Name Description Row
25A1BK1 Circuit Breaker 1 voltages within Synchronism Angle 1 38
25A1BK2 Circuit Breaker 2 voltages within Synchronism Angle 1 40
25A2BK1 Circuit Breaker 1 voltages within Synchronism Angle 2 39
25A2BK2 Circuit Breaker 2 voltages within Synchronism Angle 2 40
25ENBK1 Circuit Breaker 1 synchronism-check element enable 38
25ENBK2 Circuit Breaker 2 synchronism-check element enable 40
25W1BK1 Circuit Breaker 1 Angle 1 within Window 1 38
25W1BK2 Circuit Breaker 2 Angle 1 within Window 1 40
25W2BK1 Circuit Breaker 1 Angle 2 within Window 2 38
25W2BK2 Circuit Breaker 2 Angle 2 within Window 2 40
271P1 Undervoltage Element 1, Level 1 asserted 384
271P1T Undervoltage Element 1, Level 1 timed out 384
271P2 Undervoltage Element 1, Level 2 asserted 384
272P1 Undervoltage Element 2, Level 1 asserted 384
272P1T Undervoltage Element 2, Level 1 timed out 384
272P2 Undervoltage Element 2, Level 2 asserted 384
273P1 Undervoltage Element 3, Level 1 asserted 385
273P1T Undervoltage Element 3, Level 1 timed out 385
273P2 Undervoltage Element 3, Level 2 asserted 385
274P1 Undervoltage Element 4, Level 1 asserted 385
274P1T Undervoltage Element 4, Level 1 timed out 385
274P2 Undervoltage Element 4, Level 2 asserted 385
275P1 Undervoltage Element 5, Level 1 asserted 386
275P1T Undervoltage Element 5, Level 1 timed out 386
275P2 Undervoltage Element 5, Level 2 asserted 386
276P1 Undervoltage Element 6, Level 1 asserted 386
276P1T Undervoltage Element 6, Level 1 timed out 386
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