ABB RELION REB670, Руководство по применению

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• ForceOut
• ForceIn
• Conditionally
If for a particular CT input setting parameter ZoneSwitching is set to ForceOut , then
this CT input will be disconnected from both the differential zones, regardless of any
other set value or active binary input, while zone switching feature is active within the
IED. This setting is typically used for bus coupler bay in double busbar stations.
If for a particular CT input setting parameter ZoneSwitching is set to ForceIn , then this
CT input will be connected to both the differential zones, regardless of any other set
value or active binary input, while zone switching feature is active within the IED. This
setting is typically used for all feeders bay in a station with two single zone
interconnected by a sectionalizing disconnector.
If for a particular CT input setting parameter ZoneSwitching is set to Conditionally ,
then this CT input will be connected to both the differential zones only if it was
included to any of the two zones for 2ms before the zone switching feature was
activated. This setting is typically used for all feeders bay in double busbar stations.
With this setting all feeder bays, which were not connected to any of the two zones
before the zone interconnection activation (that is, out for scheduled maintenance), will
not either be included during zone interconnection.
This practically means that for double busbar station, when zone switching feature is
active, all feeder bays will be connected to both differential zones, while bus coupler
CT will be disconnected from both zones. In this way simple but effective solution is
formed. It is as well important to notice that all necessary changes in the individual bay
tripping arrangements will be automatically performed within the internal logic.
A dedicated binary signal will be immediately activated in the internal logic when zone
interconnection feature is activated. If this feature is active longer than the pre-set time
separate alarm binary signal is activated, in order to alarm the station personnel about
such operating conditions.
ZoneInterconnection feature can be disabled by a parameter
setting for substation arrangements where it is not required that is, single busbar
stations, breaker-and-a-half stations and so on.
6.1.3.9 Tripping arrangements
M12116-3 v3
Tripping circuit arrangement
The contact outputs are of medium duty type. It is possible to use them to directly trip
the individual bay circuit breakers. This solution is suitable for all types of station
arrangements. The internal zone selection logic provides individual bay trip signals in
the internal software and no external relay for this purpose are required. This
arrangement insures correct trip signal distribution to all circuit breakers in case of
Section 6
1MRK 505 370-UUS A
Differential protection
132 Busbar protection REB670 2.2 ANSI
Application manual