Parameter: K0 and Angle (K0)
•
Default setting K0 = 1.000
•
Default setting Angle (K0) = 0.00°
NOTE
The visibility of the K0 and Angle (K0) parameters depends on the selected setting format of the
residual compensation factors. The parameters K0 and Angle (K0) only become visible after you have
set the parameter Set. format residu. comp. = K0 for the device. The Set. format residu.
comp. parameter can be found in the DIGSI 5 project tree under Name of the device → Parameter →
Device settings.
The K0 and Angle (K0) parameters are used to set the complex residual compensation factor.
Make sure that the line angle is set correctly because the device needs the line angle for calculation of the
compensation components from the K0 factor. The complex residual compensation factor is defined by the
value and the angle. You can calculate the complex residual compensation factor from the line data as
follows:
[foforlk0-180912-01.tif, 1, en_US]
where:
Z
0
(complex) zero-sequence impedance
Z
1
(complex) positive-sequence impedance
This data can either be used for the entire line or as length-related values, since the quotients are length-inde-
pendent. The data can be calculated both from the primary values and from the secondary values.
For overhead lines, you can use the values for the calculation because the angles of the zero-sequence system
and the positive-sequence system differ only slightly. For cables, however, significant angular differences can
occur, as the following example illustrates.
EXAMPLE
110-kV single-conductor liquid-filled cable 3 · 185 mm
2
Cu with the data:
Z
1
/s
0.408 · e
j73°
Ω/km positive-sequence impedance
Z
0
/s
0.632 · e
j18.4°
Ω/km zero-sequence impedance
s Line length
The values for calculation of the residual compensation factor K0 are:
[fofork02-180912-01.tif, 1, en_US]
[fofork03-180912-01.tif, 1, en_US]
The setting value of the parameter K0 is calculated from:
Protection and Automation Functions
6.46 Fault Locator
938 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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