identification with load encroachment for mho function FMPSPDIS, where also the
relevant settings can be found. Information about the load encroachment from
FMPSPDIS to the zone measurement is given in binary format to the input signal
LDCND.
7.1.6.3
Basic operation characteristics
Each impedance zone can be switched
On
and
Off
by the setting parameter
Operation
.
Each zone can be set to
Non-directional
,
Forward
or
Reverse
by setting the parameter
DirMode
.
The mho characteristics can be classified into -
Offset
or
Directional
. The directional
mho characteristics can be set to
Offset
,
Forward
or
Reverse
by the setting parameter
DirMode
. The offset mho characteristic can be set to
Forward
or
Reverse
or
Non-
Directional
by the setting parameter
OffsetMhoDir
.
The operation for phase-to-earth and phase-to-phase fault can be individually
switched
On
and
Off
by the setting parameter
OpModePE
and
OpModePP.
For critical applications such as for lines with high SIRs as well as CVTs, it is possible
to improve the security by setting the parameter
ReachMode
to
Underreach
. In this
mode the reach for faults close to the zone reach is reduced by 20% and the filtering
is also introduced to increase the accuracy in the measuring. If the
ReachMode
is set to
Overreach
no reduction of the reach is introduced and no extra filtering introduced.
The latter setting is recommended for overreaching pilot zone, zone 2 or zone 3
elements and reverse zone where overreaching on transients is not a major issue either
because of less likelihood of overreach with higher settings or the fact that these
elements do not initiate tripping unconditionally.
The offset Mho characteristic can be set in
Non-directional
,
Forward
or
Reverse
by
the setting parameter
OffsetMhoDir
. When
Forward
or
Reverse
is selected a
directional line is introduced. Information about the directional line is given from the
directional element and given to the measuring element as binary coded signal to the
input
DIRCND
.
When
DirMode
is set to
offset
and
offsetMhoDir
is set as
Non-Directional
, ZDMRDIR
does not have any effect on the measurement loop and operation of the function. When
DirMode
is selected as
Forward
or
Reverse
, a directional line is introduced.
Information about the directional line is given from the directional element
(ZDMRDIR) and given to the measuring element as binary coded signal to the input
DIRCND
.
The zone reach for phase-to-earth fault and phase-to-phase fault is set individually in
polar coordinates.
The impedance is set by the parameters
ZPE
and
ZPP
and the corresponding
arguments by the parameters
ZAngPE
and
ZAngPP
.
Section 7
1MRK502052-UEN B
Impedance protection
182
Technical manual
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