Name Values (Range) Unit Step Default Description
ZoneSeqCoord Off
On
- - Off Coordination of down stream devices to
local protection unit’s AR
tSuccessful 0.000 - 60.000 s 0.001 1.000 Delay time before indicating successful
reclosing
tSlaveDeadTime 0.100 - 60.000 s 0.001 0.400 Wait time for the slave to close when
WAIT input has reset
9.2.6 Operation principle
9.2.6.1 Terminology explanation
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Before describing the auto reclosing function it is first necessary to define the
following terminology:
• a shot is an attempt from the function to close a circuit breaker
• multi-shot is where more than one shot is attempted
• dead time is the time between a start of the function and the attempt to close
the circuit breaker
• reclaim time is the time from the circuit breaker closing command till the
reset of the function, should the auto reclosing attempt be successful and no
new start is received
• high-speed shot is generally used for an application where the dead time is
less than 1 second and synchrocheck is not required
• delayed auto reclosing is generally regarded as an application where the dead
time is greater than 1 second and where typically synchrocheck is required
• sequence is the auto reclosing cycle beginning with start and ending with
successful, unsuccessful or aborted reclosing as a result
• status is the state which the auto reclosing function have reached in the
sequence
9.2.6.2 Status descriptions
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The auto reclosing function can be in one of the following five statuses:
“Inactive”
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The auto recloser is in “inactive” status when the following conditions are fulfilled:
• the auto recloser is set to On and
• either the circuit breaker is not closed
• or the circuit breaker is not ready
The function will not react on any start from protection trips while in
“inactive” status and no automatic reclosing is possible.
Section 9 1MRK 505 384-UEN A
Control
246 Breaker protection REQ650 2.2 IEC
Technical manual
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