15.7.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Generic communication function for
Double Point indication
DPGAPC - -
15.7.2 Application
Generic communication function for Double Point indication (DPGAPC) function block
is used to send double point position indication to other systems, equipment or functions
in the substation through IEC 61850-8-1 or other communication protocols. It is
especially intended to be used in the interlocking station-wide logics. To be able to get the
signals into other systems, equipment or functions, one must use other tools, described in
the Engineering manual, and define which function block in which systems, equipment or
functions should receive this information.
More specifically, DPGAPC function reports a combined double point position indication
output POSITION, by evaluating the value and the timestamp attributes of the inputs
OPEN and CLOSE, together with the logical input signal VALID.
When the input signal VALID is active, the values of the OPEN and CLOSE inputs
determine the two-bit integer value of the output POSITION. The timestamp of the output
POSITION will have the latest updated timestamp of the inputs OPEN and CLOSE.
When the input signal VALID is inactive, DPGAPC function forces the position to
intermediated state.
When the value of the input signal VALID changes, the timestamp of the output
POSITION will be updated as the time when DPGAPC function detects the change.
Refer to Table
52 for the description of the input-output relationship in terms of the value
and the quality attributes.
Table 52: Description of the input-output relationship
VALID
OPEN CLOSE
POSITION
Value Description
0 - - 0 Intermediate
1 0 0 0 Intermediate
1 1 0 1 Open
1 0 1 2 Closed
1 1 1 3 Bad State
Section 15 1MRK 506 369-UUS -
Control
740 Line distance protection REL670 2.2 ANSI
Application manual
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