CB Status CB Open Binary Input CB Closed Binary Input
CB is Open 1 0
CB is Closed 0 1
CB is traveling between the above
2 states
0 0
The relay goes to Lockout and the CB Alarm output is given where the traveling condition exists for longer
than the CB Travel Alarm setting.
An instantaneous CB Alarm is given for a 1/1 state, i.e. where the CB indicates it is both open and closed at
the same time.
Parameter: CB-n > Open Delay
•
Default setting: 10 s
The Open CB Delay setting is applicable to CB trip commands received through an Open CB binary
input or via the Control menu. Operation of the Open CB binary output is delayed by the Open CB
Delay setting. The status of this delay is displayed on the relay fascia as it decrements towards zero.
Only when the delay reaches zero will the trip command be issued and related functionality initiated.
Note that a CB trip initiated by an Open CB control is fundamentally different from a CB trip initiated by a
protection function. A CB trip caused by a CB Open command will not initiate functionality such as
circuit-breaker fail, fault data storage, I
2
t measurement and operation counter.
Parameter: CB-n > Open Pulse
•
Default setting: 1 s
The duration of the CB open pulse is user settable to allow a range of CBs to be used.
The CB open pulse must be long enough for the CB to physically open.
Parameter: CB-n > DBI Alarm
•
Default setting: 0 s
The CB Open and CB Closed binary inputs are continually monitored to track the CB Status.
A “Don’t Believe it” (DBI) condition exists for a 1/1 state, i.e. where the CB indicates it is both open and
closed at the same time.
The relay goes to Lockout and the CB Alarm output is given where the DBI condition exists for longer
than the CB DBI Delay setting.
Parameter: CB-n > Trip Time Alarm
•
Default setting: 0.2 s
The CB Trip Time meter displays the measured time between the trip being issued and the CB auxil-
iary contacts changing state. If this measured time exceeds the Trip Time Alarm time, a Trip Time
Alarm output is issued.
Parameter: CB-n > Trip Time Adjust
•
Default setting: 0.015 s
This allows for the internal delays caused by the relay, especially the delay before a binary input operates,
to be subtracted from the measured CB trip time. This gives a more accurate measurement of the time it
took for the CB to actually trip.
Control Functions
7.2 52 Circuit-Breaker Control
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 413
C53000-G7040-C014-1, Edition 11.2019
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