0.5·RFFwPP·K3
K3 = 2 / sqrt(3)
X1·K3
0.5·RFRvPP·K3
30 deg
R (ohm/phase)
X (ohm/phase)
4 X1PP
3
×
IEC09000635-1-en.vsd
30 deg
2
3
RFwPP ×
IEC09000635 V2 EN
Figure 172: The characteristic of FRPSPDIS (21) for three-phase fault (set angle 70°)
6.10.2.4 Load encroachment
Each of the six measuring loops has its own load encroachment characteristic based on
the corresponding loop impedance. The load encroachment functionality is always
active, but can be switched off by selecting a high setting.
The outline of the characteristic is presented in figure 106. As illustrated, the resistive
blinders are set individually in forward and reverse direction while the angle of the
sector is the same in all four quadrants.
1MRK505222-UUS C Section 6
Impedance protection
333
Technical reference manual
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