7SR210 & 7SR220 Description of Operation
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Page 73 of 94
Blocked Close Delay
The close command may be delayed by a
Block Close CB
signal applied to a binary input. This causes the
feature to pause before it issues the CB close command and can be used, for example, to delay CB closure until
the CB energy has reached an acceptable level. If the Block signal has not been removed before the end of the
defined time,
Blocked Close Delay
, the relay will go to the lockout state.
Open CB Delay
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.
NB: During the open countdown period the operation can be terminated by pressing ‘Cancel’ on the fascia.
Open CB Pulse
The duration of the CB open Command pulse is user settable to allow a range of CBs to be used.
CB Failed to Open is taken from the Circuit Breaker Failure Element.
CB Travel Alarm (DBI)
The
CB Open
and
CB Closed
binary inputs are continually monitored to track the CB Status.
The CB should only ever be in 3 states:
CB Status
CB Open
binary input
CB Closed
binary input
CB is Open
1
0
CB is Closed
0
1
CB is Travelling between the above 2 states
0
0
The Relay goes to Lockout and the
CB Alarm
output is given where the Travelling 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.
Figure 4.11-1 Logic Diagram: Circuit Breaker Status
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