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2 Functions
However the pickup value should not be selected lower than necessary, as a too sen-
sitive setting risks prolonging the drop-out time due to balancing processes in the
current transformer secondary circuit during switchoff of heavy currents.
The time delay is entered at address 7004 TRIP-Timer and is based on the
Time Delay
maximum breaker disconnecting time, the dropout time of overcurrent detection plus
a safety margin which takes into consideration delay time runtime deviation. The time
sequences are illustrated in the following figure.
Figure 2-59
2.26.3 Settings
The table indicates region-specific presettings. Column C (configuration) indicates the
corresponding secondary nominal current of the current transformer.
Addr.
Parameter
7001
BREAKER FAILURE
7002
TRIP INTERN
7003
CIRC. BR. I>
7004
TRIP-Timer
2.26.4 Information List
No.
Information
1403
>BLOCK BkrFail
1422
>Break. Contact
1423
>ext.start1 B/F
160
Time sequence for Typical Fault Clearance and for Breaker Failure
C
Setting Options
OFF
ON
Block relay
OFF
BO3
CFC
1A
0.04 .. 2.00 A
5A
0.20 .. 10.00 A
0.06 .. 60.00 sec; ∞
Type of In-
formation
EM
>BLOCK breaker failure
EM
>Breaker contacts
EM
>ext. start 1 breaker failure prot.
Default Setting
OFF
Breaker Failure Protection
OFF
Start with Internal TRIP
Command
0.20 A
Supervision Current
Pickup
1.00 A
0.25 sec
TRIP-Timer
Comments
Comments
7UM61 Manual
C53000-G1176-C127-3
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