During offset mode or if
DirModeZx
(where
x
is 1-5 depending on selected zone) is
selected as
Non-directional
, ZDNRDIR will not have any effect on the measurement loop
and operation of the function. When
MhoCharZx
(where
x
is 1-5 depending on selected
zone) is selected as
Directional
and
DirModeZx
(where
x
is 1-5 depending on selected
zone) is selected as
Forward
or
Reverse
, a directional line is introduced. Information
about the directional line is given from the directional element (ZDNRDIR) and given to
the measuring element as binary coded signal to the input DIRCND.
The zone reach for phase-to-ground fault and phase-to-phase fault is set individually in
polar coordinates.
IEC11000254_1_en.vsd
DirModeZx=no dir
MhoCharZx=Directional/offset
R
X
DirModeZx=Forward
MhoCharZx=Directional
R
X
DirModeZx=Reverse
MhoCharZx=Directional
Zx
ZxRev
R
X
Zx
ZxRev
R
X
Zx
ZxRev
DirModeZx=Forward
MhoCharZx=offset
R
X
Zx
ZxRev
DirModeZx=Reverse
MhoCharZx=offset
IEC11000254 V1 EN
Figure 40:
Mho characteristics
The impedance is set by the parameter
Z
and the corresponding angles by the parameter
LineAng
.
Compensation for ground return path for faults involving ground is done by setting the
parameter
KNMagx
and
KNAngx
.
Section 6
1MRK 506 335-UUS A
Impedance protection
110
Technical manual
Содержание REL650 series
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