- 907 -
Three position device function (TPOS)
The three-position device function (TPOS) is used when it is required to control a device having
a triple selector (e.g., the selector has three positions: P1, P2, or P3). The user can experience
the following devices as the triple selector: A 43-switch (43S), an earth-switch (ES) with a
disconnector (DS) and others.
Figure 4.9-1 Example of switch positions in EDS operation
The TPOS function has “Operation counters” and “Operation time measurement”; these
features are used to examine the devices; these features are useful when the user wishes to
assess the operating time of the device; these features are performed by counting the state-
changes for the device. The BO circuits connected with the TPOS function are used for issuing
commands; the BI circuits are used for receiving responses; hence, the user should connect the
BO and BI circuits with the TPOS function†. The TPOS function includes three logic groups:
1. Select logic, 2. Cancel logic, and 3. Operate logic.
EDS devices (43-switches) can be controlled separately; i.e., the function has a number of
separate sets for control (i.e., TPOS01, TPOS02, etc.). For simplicity, only the TPOS01 function
is discussed here; the features in the other TPOS functions are identical to the TPOS01
function.
†Note: A binary IO module has binary input circuits (BIs) and binary output circuits
(BOs); the user makes the connection between the TPOS01 function and the
binary IO module using a signal number (is made of a “Function_ID” and an
“Element_ID”). The signal numbers and names in the TPOS01 function are listed
later.
Tips: If the user wishes to apply the TPOS function quickly, go to sections 4.9.6 and
4.9.5, where settings of the BI and BO circuits and the mapping of signal-points
for IEC61850 communication is described.
To Next Page
Loading...
