12.3.1.2 Switch controller SCSWI M16596-3 v5SCSWI may handle and operate on one three-phase device or three one-phaseswitching devices.After the selection of an apparatus and before the execution, the switch controllerperforms 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 theoperation is permitted.• The synchronism check/synchronizing conditions are read and checked, andperforms operation upon positive response.• The blocking conditions are evaluated• The position indications are evaluated according to given command and itsrequested 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 switchcontroller function, the switch controller will "merge" the position of the three switchesto the resulting three-phase position. In case of a pole discrepancy situation, that is, thepositions 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 orSXSWI. The switch controller represents the content of the SCSWI logical node(according to IEC 61850) with mandatory functionality.12.3.1.3 Switches SXCBR/SXSWI M16602-3 v6Switches are functions used to close and interrupt an ac power circuit under normalconditions, or to interrupt the circuit under fault, or emergency conditions. Theintention with these functions is to represent the lowest level of a power-switchingdevice with or without short circuit breaking capability, for example, circuit breakers,disconnectors, grounding switches etc.Section 12 1MRK 505 370-UUS AControl348 Busbar protection REB670 2.2 ANSIApplication manual
