Rockwell Automation 865 Differential Protection Relay - Manual (Page 71)

Protection Functions 3-27
865-UM001A-EN-P – July 2009
If this time is longer than the operating time of the CBFP stage, the
CBFP stage activates another output relay, which will remain
activated until the primary trip relay resets.
The CBFP stage is supervising all the protection stages using the
same selected trip relay, since it supervises the control signal of this
relay. See Chapter 5 for details about the output matrix and the trip
relays.
Table 3.15 – Parameters of the Circuit Breaker Failure Stage CBFP (50BF)
Parameter Value Unit Description Note
Status -
Blocked
Start
Trip
Current status of the stage
F
F
SCntr Cumulative start counter C
TCntr Cumulative trip counter C
Force Off
On
Force flag for status forcing for test
purposes. This is a common flag
for all stages and output relays, too.
Automatically reset by a 5-minute
timeout. Set
CBrelay
1
2
The supervised output relay
Relay T1
Relay T2 Set
t> s Definite operation time. Set
For details of setting ranges see “Protection Stages” in Chapter 10.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on
This setting is also used by the circuit breaker condition monitoring. See Chapter 3.
Recorded Values of the Latest Eight Faults
Detailed information is available on the eight latest faults: Time
stamp and elapsed delay.
Table 3.16 – Recorded values of the Circuit Breaker Failure Stage
(8 latest faults) CBFP (50BF)
Parameter Value Unit Description
yyyy-mm-dd Time stamp of the recording, date
hh:mm:ss.ms Time stamp, time of day
EDly % Elapsed time of the operating time setting.
100% = trip