ABB Relion 650 Series Technical Manual page 138

Section 5
Impedance protection
V1AB
V1ABM
IAB
The default settings for
figure 74
quadrilateral characteristic) and they should not be changed unless system studies show the
necessity.
ANSI06000416 V1 EN-US
Figure 74: Setting angles for discrimination of forward and reverse fault for mho
132
Voltage difference between phase A and B (B lagging A)
Memorized voltage difference between phase A and B (B lagging A)
Current difference between phase A and B (B lagging A)
AngDir and AngNegRes are 15 (= -15) and 115 degrees respectively (see
and figure 75 Setting angles for discrimination of forward and reverse fault for mho and
Directional impedance element for mho characteristic (ZDMRDIR) is used
When
Fullscheme distance protection, mho characteristic (ZMHPDIS) the
together with
following settings for parameter
Comparator is strongly recommended
• alternative
Imp/Comp should generally not be used
• alternative
• alternative Impedance should not be used. This altenative is intended for use
together with Distance protection zone, quadrilateral characteristic
(ZMQPDIS)
X
Zset reach point
AngNegRes
-AngDir
-Zs
en06000416_ansi.vsd
characteristic
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DirEvalType is vital:
R
1MRK 506 326-UUS B
Line distance protection REL650
Technical manual