• A request initiates to reserve other bays to prevent simultaneous operation.• Actual position inputs for interlocking information are read and evaluated ifthe operation is permitted.• The synchrocheck/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 synchrocheck.At error the command sequence is cancelled.In the case when there are three one-phase switches (SXCBR) connected to theswitch controller function, the switch controller will "merge" the position of thethree switches to the resulting three-phase position. In case of a pole discordancesituation, that is, the positions of the one-phase switches are not equal for a timelonger than a settable time; an error signal will be given.The switch controller represents the content of the SCSWI logical node (accordingto IEC 61850) with mandatory functionality.12.3.4 Switches SXCBR M16602-3 v7Switches 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, circuitbreakers, disconnectors, earthing switches etc.The purpose of these functions is to provide the actual status of positions and toperform the control operations, that is, pass all the commands to the primaryapparatus via output boards and to supervise the switching operation and position.Switches have the following functionalities:• Local/Remote switch intended for the switchyard• Block/deblock for open/close command respectively• Update block/deblock of position indication• Substitution of position indication• Supervision timer that the primary device starts moving after a command• Supervision of allowed time for intermediate position• Definition of pulse duration for open/close command respectivelySection 12 1MRK 505 393-UEN BControl258 Line differential protection RED650 2.2 IECApplication manual
