6.4.2
Functionality
The evaluation of the direction to the fault is made in the directional element ZDNRDIR
(21D) for the quadrilateral and mho characteristic distance protections ZQMPDIS (21).
6.4.3
Function block
ANSI11000187_1_en.vsd
ZDARDIR (21D)
I3P*
V3P*
I3PPOL*
DIRCND
FWD_G
REV_G
STDIRCND
ANSI11000187 V1 EN
Figure 73:
ZDARDIR (21D) function block
6.4.4
Signals
Table 43:
ZDARDIR (21D) Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Group signal for current Input
V3P
GROUP
SIGNAL
-
Group signal for voltage Input
I3PPOL
GROUP
SIGNAL
-
Polarisation current signals
DIRCND
INTEGER
0
Binary coded directional signal
Table 44:
ZDARDIR (21D) Output signals
Name
Type
Description
FWD_G
BOOLEAN
Forward start signal from phase-earth directional
element
REV_G
BOOLEAN
Reverse start signal from phase-earth directional
element
STDIRCND
INTEGER
Start condition - binary coded
1MRK 506 335-UUS A
Section 6
Impedance protection
161
Technical manual
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