V1A
Positive sequence phase voltage in phase A
V1AM
Positive sequence memorized phase voltage in phase A
IA
Phase current in phase A
V1AB
Voltage difference between phase A and B (B lagging A)
V1ABM
Memorized voltage difference between phase A and B (B lagging A)
IAB
Current difference between phase A and B (B lagging A)
The default settings for
AngDir
and
AngNegRes
are 15 (= -15) and 115 degrees
respectively (see figure
and figure
Setting angles for discrimination of forward and
reverse fault for mho and quadrilateral characteristic) and they should not be changed
unless system studies show the necessity.
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 78:
Setting angles for discrimination of forward and reverse fault for mho
characteristic
Section 6
1MRK 506 335-UUS A
Impedance protection
168
Technical manual
Содержание REL650 series
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