ABB Relion 670 Series Applications Manual page 323

1MRK 511 401-UUS F
• 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.
14.3.4 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.
The purpose of these functions 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.
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 respectively
The realizations of these functions are done with SXCBR representing a circuit breaker and with
SXSWI representing a circuit switch that is, a disconnector or an grounding switch.
Circuit breaker (SXCBR) can be realized either as three one-phase switches or as one three-phase
switch.
Bay control REC670
Application manual
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Section 14
Control
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