The default settings for
AngDir
and
AngNegRes
are 15 (= -15) and 115 degrees
) and they should not be changed unless system studies
show the necessity.
If one sets
DirEvalType
to
Comparator
(which is recommended when using the mho
characteristic) then the directional lines are computed by means of a comparator-type
calculation, meaning that the directional lines are based on mho-circles (of infinite
radius). The default setting value
Impedance
otherwise means that the directional lines
are implemented based on an impedance calculation equivalent to the one used for the
quadrilateral impedance characteristics.
When
Directional impedance element for mho characteristic
(ZDMRDIR) is used together with
Fullscheme distance protection,
mho characteristic
(ZMHPDIS) the following settings for parameter
DirEvalType
is vital:
•
alternative
Comparator
is strongly recommended
•
alternative
Imp/Comp
should generally not be used
•
alternative Impedance should not be used. This altenative is
intended for use together with Distance protection zone,
quadrilateral characteristic (ZMQPDIS)
X
R
-AngDir
AngNegRes
Zset reach point
-Zs
en06000416_ansi.vsd
ANSI06000416 V1 EN
Figure 142:
Setting angles for discrimination of forward fault
The reverse directional characteristic is equal to the forward characteristic rotated by
180 degrees.
Section 6
1MRK505222-UUS C
Impedance protection
278
Technical reference manual
Содержание Relion 670 series
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