7.7.6.4 Load encroachment
GUID-ABD74C3B-FF0F-45B3-BF34-D7C5FEAD62D3 v1
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 138. 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.
R
X
RLdFwd
RLdRev
LdAngle
LdAngle
LdAngle
LdAngle
en05000196_ansi.vsd
ANSI05000196 V1 EN-US
Figure 137: Characteristic of load encroachment function
The influence of load encroachment function on the operation characteristic is dependent on the
chosen operation mode of FRPSPDIS (21) function. When output signal PHSELZ is selected, the
characteristic for FRPSPDIS (21) (and also zone measurement depending on settings) will be
reduced by the load encroachment characteristic, see figure
139.
When output signal PHSELI is selected, the operation characteristic will be as in figure 138. The
reach will in this case be limit by the minimum operation current and the distance measuring
zones.
1MRK 502 066-UUS B Section 7
Impedance protection
281
Technical manual
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