ABB REL650 series - Load Encroachment

0.5·RFltFwdPP·K3
X1·K3
90 deg
0.5·RFltRevPP·K3
30 deg
R (ohm/phase)
X (ohm/phase)
4 X1
3
×
2 RFltFwdPP
3
×
ANSI05000671-4-en.vsd
2
K3
3
=
ANSI05000671 V4 EN
Figure 55: The characteristic of FDPSPDIS (21) for three-phase fault (setting
parameters in italic)
6.2.6.4 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
56. 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.
Section 6 1MRK 506 335-UUS A
Impedance protection
136
Technical manual