Function Block - ABB RELION REX640 Technical Manual

1MRS759142 C
9.3.2
9.3.3
9.3.4
Table 1325: Status indication for a three-position switch based on auxiliary contacts
Status Inputs
POSITION DCPOSCL
OSE
Disconnector 1
closed
Disconnector 0
intermediate
Both open 0
Earthing 0
switch
intermediate
Table continues on next page
REX640
Technical Manual

Function block

GUID-07A7B1BB-C927-4E39-BC0A-41B7A83EA09E V1 EN
Figure 735: Function block
Functionality
The three-state disconnector position indication function P3SSXSWI provides status
information on three-state switches: MV air-insulated switchgear (AIS) and gas-
insulated switchgear (GIS). The function is designed according to the IEC 61850-7-4
standard including logical nodes CSWI and XSWI.
Operation principle
Position indication
In certain three-position switches an additional reed contact is available to indicate
safe earthing. The contact is TRUE only when the earthing switch is in closed position.
The reed contact is given a short time window to confirm closed earthing switch
position, in case of vibrations. If the earthing switch has closed but the reed contact
does not close within the time window, faulty position is reported. The availability of
the reed contact needs to be set through Reed contact setting by setting it as
"Available". The reed contact signal is connected at input REED in this control mode.
The state of the switch is indicated at outputs DCCLOSE_POS, DCOPEN_POS,
ESCLOSE_POS and ESOPEN_POS together with the OKPOS information.
Debouncing and short disturbances in an input are eliminated by filtering. The binary
input filtering timer can be adjusted separately for each digital input used by the
function block. The reporting of faulty or intermediate position of the apparatus
occurs after the Event delay setting. A common three-position status is indicated at
variable POSITION.
DCPOSOP ESPOSCL ESPOSOP
EN OSE EN
0 0 1
0 0 1
1 0 1
1 0 0
Outputs
REED DCCLOSE DCOPEN_
_POS POS
x 1 0
x 0 0
x 0 1
x 0 1
Section 9
Control functions
ESCLOSE ESOPEN_ OKPOS
_POS POS
0 1 1
0 1 0
0 1 1
0 0 0
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