ABB Relion REG670, Technical Manual

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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 346: 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, switch
controller, protection functions and autorecloser.
The blocking possibilities are:
• Block/deblock for open command. It is used to block operation for open
command.
• Block/deblock for close command. It is used to block operation for close
command.
• Update block/deblock of positions. It is used to block the updating of position
values. Other signals related to the position will be reset.
• Blocking of function, BLOCK. If BLOCK signal is set, it means that the function
is active, but no outputs are generated, no reporting, control commands are
rejected and functional and configuration data is visible.
The above blocking outputs are stored in a non-volatile memory.
Substitution
The substitution part in SXSWI is used for manual set of the position and quality of the
switch. The typical use of substitution is that an operator enters a manual value
because the real process value is erroneous of some reason. SXSWI will then use the
manually entered value instead of the value for positions determined by the process.
It is always possible to make a substitution, independently of the
position indication and the status information of the I/O board. When
substitution is enabled, the other signals related to the position follow
the substituted position. The substituted values are stored in a non-
volatile memory. If the function is blocked or blocked for update when
the substitution is released, the position value is kept the same as the
last substitution value, but the quality is changed to "questionable, old
data", indicating that the value is old and not reliable.
Section 14
1MRK502052-UEN B
Control
732
Technical manual