jX
R
X
C
Z
S
X
1
RV
R
FW
R
RV
Z
S
en06000584-2.vsd
X
LLOC
X
1
FW
X
C
X
line
- X
C
IEC06000584 V2 EN-US
Figure 116: 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
114
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.
1MRK 504 163-UUS A Section 8
Impedance protection
Transformer protection RET670 2.2 ANSI 241
Application manual
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