ABB REC650 ANSI, Technical Manual

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10.3.9.3 Circuit switch SXSWI
The users of the Circuit switch (SXSWI) is other functions such as for example, switch
controller, protection functions, autorecloser function, or a 61850 client residing in
another IED or the operator place. SXSWI executes commands, evaluates block
conditions and evaluates different time supervision conditions. Only if all conditions
indicate a switch operation to be allowed, SXSWI performs the execution command. In
case of erroneous conditions, the function indicates an appropriate "cause" value.
SXSWI has an operation counter for closing and opening commands. The counter value
can be read remotely from the operator place. The value is reset from a binary input or
remotely from the operator place by configuring a signal from the Single Point Generic
Control 8 signals (SPC8GGIO) for example.
Local/Remote switch
One binary input signal LR_SWI is included in SXSWI to indicate the local/remote switch
position from switchyard provided via the I/O board. If this signal is set to TRUE it means
that change of position is allowed only from switchyard level. If the signal is set to FALSE
it means that command from IED or higher level is permitted. When the signal is set to
TRUE all commands (for change of position) from internal IED clients are rejected, even
trip commands from protection functions are rejected. The functionality of the local/
remote switch is described in figure
124 .
From I/O switchLR
TRU
E
FALS
E
Local= Operation at
switch yard level
Remote= Operation at
IED or higher level
en05000096.vsd
IEC05000096 V1 EN
Figure 124: Local/Remote switch
Blocking principles
SXSWI includes several blocking principles. The basic principle for all blocking signals
is that they will affect commands from all other clients for example, operators place,
protection functions, autorecloser and so on.
The blocking possibilities are:
1MRK 511 287-UUS A
Section 10
Control
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Technical manual