EXAMPLE
110-kV overhead line, 150 mm
2
with the data
R´
1
= 0.19 Ω/km
X´
1
= 0.42 Ω/km
You calculate the setting value for the line angle as follows:
[folwibsp-050912-01.tif, 1, en_US]
Parameter: Kr and Kx
•
Default setting (_:104) Kr = 1.00
•
Default setting (_:105) Kx = 1.00
The Kr and Kx parameters are used to set the residual compensation factors as scalar values. The Kr and Kx
parameters are relevant for the Fault locator function.
Calculate the setting values for the parameters Kr and Kx from the line data as follows:
Resistance ratio Reactance ratio
where:
R
0
Zero-sequence system resistance of the line
X
0
Zero-sequence system reactance of the line
R
1
Positive-sequence system resistance of the line
X
1
Positive-sequence system reactance of the line
This data can either be used for the entire line or as length-related values, since the quotients are length-inde-
pendent. You can calculate the data both from the primary values and from the secondary values.
EXAMPLE
110-kV overhead line, 150 mm
2
with the data:
R
1
/s 0.19 Ω/km positive-sequence system resistance
X
1
/s 0.42 Ω/km positive-sequence system reactance
R
0
/s 0.53 Ω/km zero-sequence system resistance
X
0
/s 1.19 Ω/km zero-sequence system reactance
s Line length
You receive the following setting values for the parameters Kr and Kx :
[forerlx1-050912-01.tif, 1, en_US]
Protection and Automation Functions
6.46 Fault Locator
SIPROTEC 5, Overcurrent Protection, Manual 937
C53000-G5040-C017-8, Edition 07.2017
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