9.3 Three-state disconnector position indication
P3SSXSWI (ANSI 29DS/GS)
9.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-state disconnector position
indication
P3SSXSWI I<->O P3SS 29DS/GS
9.3.2 Function block
Figure 839: Function block
9.3.3 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.
9.3.4 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
Control functions
1MRS759142 F
1536 REX640
Technical Manual
To Next Page
Loading...
