When forward direction has been selected for the offset mho, an extra criteria beside the
one for offset mho (90<β<270) is introduced, that is the angle φ between the voltage and
the current must lie between the blinders in second quadrant and fourth quadrant. See
figure
. Operation occurs if 90≤β≤270 and
ArgDir≤φ≤ArgNegRes
.
where
ArgDir
is the setting parameter for directional line in fourth quadrant in the directional element,
ZDNRDIR.
ArgNegRes
is the setting parameter for directional line in second quadrant in the directional element,
ZDNRDIR.
β
is calculated according to equation
The directional information is brought to the mho distance measurement from the mho
directional element as binary coded information to the input DIRCND. See Directional
impedance quadrilateral and mho (ZDNRDIR) for information about the mho directional
element.
V
AB
ArgDir
ArgNegRes
Z
ANSI09000118-1-en.vsd
I
AB
I
AB
jX
ANSI09000118 V1 EN
Figure 43:
Simplified offset mho characteristic in forward direction for phase A-to-B
fault
Offset mho, reverse direction
The operation area for offset mho in reverse direction is according to figure
. The
operation area in second quadrant is
ArgNegRes
+180°.
Operation occurs if 90≤β≤270 and 180° -
ArgDir ≤φ ≤ ArgNegRes
+ 180°
Section 6
1MRK 506 335-UUS A
Impedance protection
114
Technical manual
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