ABB Relion 670 Series Applications Manual page 311

1MRK 505 370-UUS Rev. K
QCBAY also provides blocking functions that can be distributed to different apparatuses within the bay.
There are two different blocking alternatives:
• Blocking of update of positions
• Blocking of commands
IEC13000016 V2 EN-US
Figure 142: APC - Local remote function block
12.3.4 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:
Busbar protection REB670
Application manual
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IEC13000016-2-en.vsd
Section 12
Control
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