0.85
1
0.15 1
Re
V A
V AM
AngDir
Ang
AngNeg
s
IA
×
+
×
-
<
<
EQUATION1618 V1 EN
(Equation 49)
where:
AngDir
is the setting for the lower boundary of the forward directional characteristic, by default set to
15 (= -15 degrees) and
AngNegRes is the setting for the upper boundary of the forward directional characteristic, by default set
to 115 degrees, see figure
V1
A
is positive sequence phase voltage in phase A
V1
AM
is positive sequence memorized phase voltage in phase A
I
A
is phase current in phase A
The setting of
AngDir
and
AngNegRes
is by default set to 15 (= -15) and 115 degrees
) and it should not be changed unless system studies have
shown the necessity.
ZDMRDIR (21D) gives a binary coded signal on the output STDIRCND depending on
the evaluation where FWD_A=1 adds 1, REV_A=1 adds 2, FWD_B=1 adds 4 etc.
R
X
AngDir
AngNegRes
en05000722_ansi.vsd
ANSI05000722 V1 EN
Figure 135:
Setting angles for discrimination of forward and reverse fault
1MRK505222-UUS C
Section 6
Impedance protection
269
Technical reference manual
Содержание Relion 670 series
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