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
12.2.6 Operation principle
12.2.6.1 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
12.2.6.2 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 12 1MRK 505 394-UEN A
Control
326 Line differential protection RED650 2.2 IEC
Technical manual
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