ABB RET670 - Page 612

• A request initiates to reserve other bays to prevent simultaneous operation.
• Actual position inputs for interlocking information are read and evaluated if the
operation is permitted.
• The synchronism check/synchronizing conditions are read and checked, and
performs operation upon positive response.
• The blocking conditions are evaluated
• The position indications are evaluated according to given command and its
requested direction (open or closed).
The command sequence is supervised regarding the time between:
• Select and execute.
• Select and until the reservation is granted.
• Execute and the final end position of the apparatus.
• Execute and valid close conditions from the synchronism check.
At error the command sequence is cancelled.
In the case when there are three one-phase switches (SXCBR) connected to the switch
controller function, the switch controller will "merge" the position of the three switches
to the resulting three-phase position. In case of a pole discrepancy situation, that is, the
positions of the one-phase switches are not equal for a time longer than a settable time;
an error signal will be given.
The switch controller is not dependent on the type of switching device SXCBR or
SXSWI. The switch controller represents the content of the SCSWI logical node
(according to IEC 61850) with mandatory functionality.
Switch (SXCBR/SXSWI)
The Switch is a function used to close and interrupt an ac power circuit under normal
conditions, or to interrupt the circuit under fault, or emergency conditions. The
intention with this function is to represent the lowest level of a power-switching device
with or without short circuit breaking capability, for example, circuit breakers,
disconnectors, grounding switches etc.
The purpose of this function is to provide the actual status of positions and to perform
the control operations, that is, pass all the commands to the primary apparatus via
output boards and to supervise the switching operation and position.
The Switch has this functionality:
• Local/Remote switch intended for the switchyard
• Block/deblock for open/close command respectively
• Update block/deblock of position indication
• Substitution of position indication
Section 3 1MRK504116-UUS C
IED application
606
Application manual