Monitoring & Control
PRS-7367 259
5.6 Interlocking Logic Output
5.6.1 Function Description
PRS-7367 relay has flexible remote control and interlock which are applicable to various service.
In general, interlocking logic provides such kind of suitable scheme for operation of power system
apparatus. Interlocking scheme of logic have function to block the switching control operation of
primary equipment. The process of each IED has completed this logic function. For
communication, IEC 61850-8-1 CODE is used as reference. The logic of interlocking scheme
standard depends on the configuration and primary apparatus status. For modern standard
requirements, interlocking logic scheme must have this flexibility to meet any specific condition.
Busbar wide interlocking for busbar earthing switches and closing of busbar isolators shall be
arranged via the LAN between the BCUs. For security reasons, the position of the bus coupler and
the bus bar earthing switchings shall be communicated from the bus coupler bay BCU to all other
BCUs via hard bus wires. Also the position of the busbar isolators for closing of the busbar earth
switches shall be communicated from all feeders to the bus coupler BCU via hard bus wires.
The interlocking logic scheme of function is easily enabled/disabled by setting parameters. Before
a switching command, output is executed, the interlocking logic of the BCU will check whether the
preprogrammed interlocking logic equations are met to permit the operation or not. The
interlocking conditions depend on the circuit configuration and apparatus position status at
switching commanding time. Some important technical terms of Interlocking functions are follow:
PRS-7367 relay is configured with 4 remote outputs by default. If more are needed, it can be
configured according to the hardware situation.
Remote control command time easily set to to any specific condition.
Remote control selection and remote control operation can be indicated by corresponding
LED lights.
The interlock logic function of PRS-7367 relay is programmable. Through the visual logic
configuration tool, the interlock logic configuration files can be modify based on the actual
requirements.
However, any condition the logic scheme of interlocking is not fulfilled and the remote function
preset will fail (not operated in due time). The failure reason of remote control can be viewed.
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