jX
R
X
C
Z
S
X
1
R
V
R
FW
R
RV
Z
S
en06000584-2.vsd
X
LLOC
X
1
F
W
X
C
X
line
- X
C
IEC06000584 V2 EN-US
Figure 103: Measured impedance at voltage inversion
Forward direction:
Where
X
LLoc
equals line reactance up to the series capacitor(in the
picture approximate 33% of XLine)
X1
is set to (XLindex-XC) · p/100.
p is defined according to figure 101
1,2 is safety factor for fast operation of Zone 1
Compensated line with the series
capacitor not into the reach of zone 1.
The setting is thus:
X1
is set to (XLine-XC) · p/100.
When the calculation of XFw gives a negative value the zone 1
must be permanently blocked.
For protection on non compensated lines facing series capacitor on next line. The
setting is thus:
1MRK 506 369-UEN B Section 8
Impedance protection
Line distance protection REL670 2.2 IEC 195
Application manual
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