ABB RELION RET670 Applications Manual page 354

Section 8
Impedance protection
348
X
PHSELZ
ANSI10000099 V1 EN-US
Figure 163: Operating characteristic when load encroachment is activated
When the "phase selection" is set to operate together with a distance measuring zone
the resultant operate characteristic could look something like in figure 164. The figure
shows a distance measuring zone operating in forward direction. Thus, the operating
area of the zone together with the load encroachment area is highlighted in black.
R
Transformer protection RET670 2.2 ANSI
1MRK 504 163-UUS A
X
R
DLECND
ANSI10000099-1-en.vsd
Application manual