ABB RELION REX640 - 9.2.4.2 Control of a three-position switch

Table 1476: Position indication values based on switch type
Status Switch type
POSITION Three-position
switch
Disconnector Earthing switch
Earthing switch
closed
Earthing switch
closed and discon-
nector open
N/A Earthing switch
closed
Earthing switch inter-
mediate
Earthing switch inter-
mediate and discon-
nector open
N/A Earthing switch inter-
mediate
Both open Earthing switch open
and disconnector
open
Disconnector open Earthing switch open
Disconnector inter-
mediate
Earthing switch open
and disconnector in-
termediate
Disconnector inter-
mediate
N/A
Disconnector closed Earthing switch open
and disconnector
closed
Disconnector closed N/A
Faulty Earthing switch faulty
or disconnector faul-
ty (or incorrect com-
bination)
Faulty Faulty
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.
9.2.4.2 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 Figure 832 . For example,
at 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.
1MRS759142 F
Control functions
REX640
Technical Manual
1523