en06000396_ansi.vsd
RFItFwdPG
X1
+XN
R
(Ohm/loop)
X
(ohm/loop)
RFItRevPG
RFItRevPG
RFItFwdPG
Kr·(
X1
+XN)
RFItRevPG
Kr·(
X1
+XN)
X1+
XN
RFItFwdPG
60 deg
60 deg
=
1
Kr
tan(60 deg)
ANSI06000396 V1 EN
Figure 53:
Characteristic of FDPSPDIS (21) for phase-to-ground fault (setting
parameters in italic), ohm/loop domain (directional lines are drawn as
"line-dot-dot-line")
Besides this, the 3I
0
residual current must fulfil the conditions according to equation
0
3 I
0.5
IMinPUPG
× ³
×
EQUATION2108-ANSI V1 EN
(Equation 28)
0
0
3
_
3
max
100
I Enable PG
I
Iph
×
³
×
EQUATION1812-ANSI V1 EN
(Equation 29)
where:
IMinPUPG
is the minimum operation current for forward zones
3I
0
Enable_PG is the setting for the minimum residual current needed to enable operation in the phase-to-
ground fault loops (in %).
Iphmax
is the maximum phase current in any of three phases.
1MRK 506 335-UUS A
Section 6
Impedance protection
133
Technical manual
Содержание REL650 series
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