ABB RET670 Applications Manual page 247

1MRK504116-UUS C
Application manual
jX
R
RV
Z
Z
S
S
IEC06000584 V1 EN
Figure 108: Measured impedance at voltage inversion
Forward direction:
Where
X
LLoc
X1
p
1,2
Compensated line with the series
capacitor not into the reach of zone 1.
The setting is thus:
X1
X
12
X
11
R
FW
X
C
equals line reactance up to the series capacitor(in the picture
approximate 33% of XLine)
is set to (XLindex-XC) · p/100.
is defined according to figure
is safety factor for fast operation of Zone 1
is set to (XLine-XC) · p/100.
Section 3
IED application
R
en06000584.vsd
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