Sel 411L - Table 4.26 Synchronism-Check Relay Word Bits

P.4.52
SEL-411L Relay Protection Manual Date Code 20151029
Autoreclosing and Synchronism-Check
Synchronism Check
Supervising Circuit
Breaker Closing via
Synchronism-Check
Use the synchronism-check element outputs to control circuit breaker closing.
Some examples follow (the ellipsis indicates other elements that you can add
to these SEL
OGIC control equations):
Supervising Autoreclosing of Circuit Breaker BK1
3P1CLS := 25A1BK1 OR … Three-Pole BK1 Reclose Supervision (SELOGIC
Equation)
Manual Closing of Circuit Breaker BK1
BK1MCL := 25W2BK1 OR … Circuit Breaker BK1 Manual Close (SELOGIC
Equation)
Table 4.26 Synchronism-Check Relay Word Bits
Relay Word Bit Description
59VP V
P
within healthy voltage window
59VS1 V
S1
within healthy voltage window
25ENBK1 Circuit Breaker BK1 synchronism-check element enabled
SFZBK1 Circuit Breaker BK1 slip frequency less than 0.005 Hz
(“no slip” condition)
SFBK1 0.005 Hz  Circuit Breaker BK1 slip frequency < 25SFBK1
25W1BK1 Voltage angle across Circuit Breaker BK1 < ANG1BK1
25W2BK1 Voltage angle across Circuit Breaker BK1 < ANG2BK1
25A1BK1 Same operation as 25W1BK1, except for the restrictive operation
(0 closure attempt) when setting 25SFBK1  OFF and the system is
slipping (see Figure 4.30)
25A2BK1 Same operation as 25W2BK1, except for the restrictive operation
(0 closure attempt) when setting 25SFBK1  OFF and the system is
slipping (see Figure 4.30)
FAST1 Bus 1 frequency greater than line frequency (f
S1
> f
P
)
SLOW1 Bus 1 frequency less than line frequency (f
S1
< f
P)
59VS2 V
S2
within healthy voltage window
25ENBK2 Circuit Breaker BK2 synchronism-check element enabled
SFZBK2 Circuit Breaker BK2 slip frequency less than 0.005 Hz
(“no slip” condition)
SFBK2 0.005 Hz  Circuit Breaker BK2 slip frequency < 25SFBK2
25W1BK2 Voltage angle across Circuit Breaker BK2 < ANG1BK2
25W2BK2 Voltage angle across Circuit Breaker BK2 < ANG2BK2
25A1BK2 Same operation as 25W1BK2, except for the restrictive operation
(0 closure attempt) when setting 25SFBK2  OFF and the system is
slipping (see Figure 4.30)
25A2BK2 Same operation as 25W2BK2, except for the restrictive operation
(0 closure attempt) when setting 25SFBK2  OFF and the system is
slipping (see Figure 4.30)
FAST2 Bus 2 frequency greater than line frequency (f
S2
> f
P
)
SLOW2 Bus 2 frequency less than line frequency (f
S2
< f
P
)