Hitachi Relion 650 Series Technical Manual page 289

1MRK 511 557-UEN Rev. A
Table 269: NO and NC status during different breaker states
Furthermore, ACBMSCBR derives the electrical status of the circuit breaker from the selected
feedback signal
closed (conducting); otherwise it is assumed electrically open (isolating).
From the electrical and mechanical feedback signals, the outputs CBSTSLX, CBSTSCFLX,
CBSTNOLX and CBSTNCLX are deduced according to
Table 270.
Table 270: Determination of case number for different feedback signals and load types
FeedbackSigO
Current
Current
Load voltage
Load voltage
Current
Load voltage
None
None
None
Case No = 0- electrical status of the breaker is not evaluated
Case No = 1- electrical status of the breaker is evaluated based on either voltage or current signal
Case No = 2- electrical status of the breaker is evaluated based on both voltage and current signals
Table 271: Circuit breaker status deduced from feedback signals, using case numbers from
AuxPosAvail Electrical
able feedback
signal open
Status
Case No 1
None Not Healthy
Not Healthy
Healthy
Healthy
Table continues on next page
Technical Manual
NC status
0
1
0
1
(Section 12.18.7.3). If the feedback signal is "healthy" the CB is assumed electrically
FeedbackSigC
Current
Load voltage
Current
Load voltage
None
None
Current
Load voltage
None
Electrical INPNOLX
feedback
signal open
Status
Not Healthy X
Healthy X
Not Healthy X
Healthy X
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NO status
0
0
1
1
Table
Capacitor/Reactor /
Coupled Capacitor
Case No
1
2
2
1
1
1
1
1
0
Table 270
INPNCLX CBSTSLX
X El open mec
inv (4)
X El inv mec
inv (0)
X El inv mec
inv (0)
X El close
mec inv (8)
Breaker state
Invalid / intermediate
Open
Closed
Faulty
271, using the case numbers from
Transformer/Transmission
Line/Coupled Transformer
Case No
0
1
1
1
0
1
0
1
0
CBSTNLLX CBSTNCLX
0 1
0 0
0 0
1 0
Section 12
Monitoring
CBSTSCFLX
Open (1)
Unknown
(0)
Unknown
(0)
Closed (2)
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