ABB Relion 650 Series Technical Manual page 238

Section 8
Control
232
position) are rejected, even trip commands from protection functions are rejected.
The functionality of the local/remote switch is described in Figure 99.
From I/O switchLR
IEC05000096 V1 EN-US
Figure 99: Local/Remote switch
Blocking principles
SXCBR 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 autoreclosure.
The blocking possibilities are:
• Block/deblock for open command. It is used to block operation for the open
command.
• Block/deblock for close command. It is used to block operation for the 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 SXCBR 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 that the real process value is erroneous for some reason. SXCBR
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
1MRK 511 424-UEN B
Local= Operation at
switch yard level
Remote= Operation at
IED or higher level
en05000096.vsd
Bay control REC650 2.2 IEC
M13487-12 v6
M13487-22 v5
Technical manual