ABB RELION REB500 Technical Manual page 152

Section 5
Bay protection functions
Status of the autoreclosure function (AR Ready and AR Blocked)
The signal AR Ready is generated when the autoreclosure function is ready to perform a
reclosure cycle and the signal AR Blocked when it is blocked.
The AR Ready signal is active providing a reclosure cycle is not blocked (no AR Blocked signal)
and a dead time is not running.
The AR Ready signal is active during a reclose command for purposes of enabling the
synchrocheck function (see
Autoreclosure cycle in progress
There are six signals which show that a reclosure cycle is running and which stage has been
reached:
• AR in prog. reclosure cycle in progress
• First AR 1P first single-phase reclosure attempt
• First AR 3P first three-phase reclosure attempt
• Second AR second reclosure attempt
• Third AR third reclosure attempt
• Fourth AR fourth reclosure attempt
The signal AR in prog. picks up at the start of the dead time and is reset by the falling edge of
the last reclose command.
Circuit-breaker closing signals Close CB and Close CB2'
The CB closing command is normally assigned to a output relay by correspondingly
configuring the parameter
A trip subsequent to a close command during the time
time step (second, third and fourth AR) or initiates a lock-out trip (depending on the setting).
A close command is reset immediately after a trip.
Definitive trip Def. Trip
The Def. Trip signal indicates that the circuit-breaker will remain tripped and no further
reclosure attempts will be made. The following conditions can cause a definitive trip:
• All reclosure attempts were unsuccessful.
• A starting or tripping signal was generated after the discrimination time and before dead
time.
• Tripping takes place while a reclosure cycle is blocked (either via the blocking input or by
the reclaim time).
• The synchroChck (or Dead line) and/or CO Ready inputs were not enabled during
Timeout due to lack of synchronism.
• The CB open signal is still active 300 ms after the close signal has reset (that is, the CB has
not responded to the close signal).
• The trip signal that followed the start signal occurred after the fault duration time
• Tripping occurred for a phase fault and the mode selected for the first reclosure cycle is
1P-1P or 1P-3P.
Perform three-phase trip Trip 3-Pol
The Trip 3-Pol output instructs the line protection to trip all three phases.
The signal can be externally or internally connected.
146
Section 5.7.6.3, Synchrocheck).
Close CB (also Close CB2 in a duplex scheme).
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t Close +300 ms switches the dead
Bay protection functions REB500
1MRK 505 406-UEN B
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t Oper .
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