ABB Relion 670 series, Technical Reference Manual

Page: 662 / 1232

Local panel switch
The local panel switch is a switch that defines the operator place selection. The switch
connected to this function can have three positions remote/local/off. The positions are
here defined so that remote means that operation is allowed from station/remote level
and local from the IED level. The local/remote switch is also on the control/protection
IED itself, which means that the position of the switch and its validity information are
connected internally, and not via I/O boards. When the switch is mounted separately
from the IED the signals are connected to the function via I/O boards.
When the local panel switch (or LHMI selection, depending on the set source to select
this) is in Off position, all commands from remote and local level will be ignored. If
the position for the local/remote switch is not valid the PSTO output will always be set
to faulty state (3), which means no possibility to operate.
To adapt the signals from the local HMI or from an external local/remote switch, the
function blocks LOCREM and LOCREMCTRL are needed and connected to QCBAY.
Permitted Source To Operate (PSTO)
The actual state of the operator place is presented by the value of the Permitted Source
To Operate, PSTO signal. The PSTO value is evaluated from the local/remote switch
position according to table
326 . In addition, there is one configuration parameter that
affects the value of the PSTO signal. If the parameter AllPSTOValid is set and LR-
switch position is in Local or Remote state, the PSTO value is set to 5 (all), that is, it is
permitted to operate from both local and remote level without any priority. When the
external panel switch is in Off position the PSTO value shows the actual state of switch
that is, 0. In this case it is not possible to control anything.
Table 326: PSTO values for different Local panel switch positions
Local panel switch
positions
PSTO value AllPSTOValid
(configuration
parameter)
Possible locations that shall be able to
operate
0 = Off 0 -- Not possible to operate
1 = Local 1 Priority Local Panel
1 = Local 5 No priority Local or Remote level without any
priority
2 = Remote 2 Priority Remote level
2 = Remote 5 No priority Local or Remote level without any
priority
3 = Faulty 3 -- Not possible to operate
Blockings
The blocking states for position indications and commands are intended to provide the
possibility for the user to make common blockings for the functions configured within
a complete bay.
Section 12
1MRK505222-UUS C
Control
656
Technical reference manual