6.5.6
Monitored data
Table 53:
ZDNRDIR (21D) Monitored data
Name
Type
Values (Range)
Unit
Description
Aph_R
REAL
-
Ohm
Resistance in phase A
Aph_X
REAL
-
Ohm
Reactance in phase A
Bph_R
REAL
-
Ohm
Resistance in phase B
Bph_X
REAL
-
Ohm
Reactance in phase B
Cph_R
REAL
-
Ohm
Resistance in phase C
Cph_X
REAL
-
Ohm
Reactance in phase C
A_Dir
INTEGER
0=No direction
1=Forward
2=Reverse
-
Direction in phase A
B_Dir
INTEGER
0=No direction
1=Forward
2=Reverse
-
Direction in phase B
C_Dir
INTEGER
0=No direction
1=Forward
2=Reverse
-
Direction in phase C
6.5.7
Operation principle
The evaluation of the directionality takes place in directional element ZDNRDIR for the
quadrilateral and mho characteristic distance protections ZQDPDIS and ZMOPDIS.
Equation
and equation
are used to classify that the fault is in the forward direction
for phase-to-ground fault and phase-to-phase fault respectively.
0.85
1
0.15 1
Re
V A
V AM
AngDir
Ang
AngNeg
s
IA
×
+
×
-
<
<
EQUATION1618 V1 EN
(Equation 35)
0.85
1
0.15
1
Re
V AB
V ABM
AngDir
Ang
AngNeg
s
IAB
×
+
×
-
<
<
EQUATION1620 V1 EN
(Equation 36)
Where:
AngDir
Setting for the lower boundary of the forward directional characteristic, by default set to 15
(= -15 degrees)
AngNegRes
Setting for the upper boundary of the forward directional characteristic, by default set to
for mho characteristics and figure
characteristics.
Table continues on next page
1MRK 506 335-UUS A
Section 6
Impedance protection
167
Technical manual
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