ABB RELION REX640 Technical Manual page 1372

Section 9
Control functions
1366
The REED input is only supervised during a short time window when earthing switch
has closed and if Reed contact setting is set as "Available" in direct control mode.
When a two-position switch type is used, the opponent switch outputs are disabled.
For example, if the switch type is disconnector, the status of the two-position switch
is based only on the connected inputs DCPOSOPEN and DCPOSCLOSE. Furthermore,
the outputs ESOPEN_POS and ESCLOSE_POS are disabled.
Common three-position status is indicated at variable POSITION, regardless of the
switch type. For example, if only a disconnector is available, and the disconnector is
in open state, the open indication equals "both open".
Table 1317: Position indication values based on switch type
Status Switch type
POSITION Three-position switch
Earthing switch closed Earthing switch closed
and disconnector open
Earthing switch Earthing switch
intermediate intermediate and
disconnector open
Both open Earthing switch open
and disconnector open
Disconnector Earthing switch open
intermediate and disconnector
intermediate
Disconnector closed Earthing switch open
and disconnector
closed
Faulty Earthing switch faulty
or disconnector faulty
(or incorrect
combination)
When controlling P3SXSWI with RIO600 SCM, the switch's position
information should be made available to the function in the protection
relay via GOOSE or binary inputs from RIO600 to reflect correct
position and status information.
Control of a three-position switch
There are three possible end positions in a three-position switch: earthing switch
closed, both open, and disconnector closed. Additionally, there are two intermediate
states: earthing switch intermediate and disconnector intermediate. The function
follows the command order in cyclic order as shown in
disconnector close state only disconnector open command can be executed. Similarly,
when the state is both open, both disconnector close and earth close commands can be
executed. When the switch indicates earthing switch or disconnector intermediate
position (for example, the motor has stopped due to timeout), a specified open
command is allowed only.
Disconnector Earthing switch
N/A Earthing switch closed
N/A Earthing switch
intermediate
Disconnector open Earthing switch open
Disconnector N/A
intermediate
Disconnector closed N/A
Faulty Faulty
Figure 728. For example, at
1MRS759142 C
REX640
Technical Manual