2 Functions
160
7UM61 Manual
C53000-G1176-C127-3
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.
Time Delay The time delay is entered at address 7004 TRIP-Timer and is based on the
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 Time sequence for Typical Fault Clearance and for Breaker Failure
2.26.3 Settings
The table indicates region-specific presettings. Column C (configuration) indicates the
corresponding secondary nominal current of the current transformer.
2.26.4 Information List
Addr. Parameter C Setting Options Default Setting Comments
7001 BREAKER FAILURE OFF
ON
Block relay
OFF Breaker Failure Protection
7002 TRIP INTERN OFF
BO3
CFC
OFF Start with Internal TRIP
Command
7003 CIRC. BR. I> 1A 0.04 .. 2.00 A 0.20 A Supervision Current
Pickup
5A 0.20 .. 10.00 A 1.00 A
7004 TRIP-Timer 0.06 .. 60.00 sec; ∞ 0.25 sec TRIP-Timer
No. Information Type of In-
formation
Comments
1403 >BLOCK BkrFail EM >BLOCK breaker failure
1422 >Break. Contact EM >Breaker contacts
1423 >ext.start1 B/F EM >ext. start 1 breaker failure prot.
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