15.3.1.2 Switch controller SCSWI
SCSWI may handle and operate on one three-phase device or three one-phase switching
devices.
After the selection of an apparatus and before the execution, the switch controller
performs the following checks and actions:
• 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.
15.3.1.3 Switches SXCBR/SXSWI
Switches are functions 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 these functions 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.
Section 15 1MRK 506 369-UUS -
Control
686 Line distance protection REL670 2.2 ANSI
Application manual
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