ABB Relion 650 Series Technical Manual page 99

1MRK 506 326-UUS B
GUID-15250C2D-D7FE-46A4-8392-8A3E5D5AAACE---ANSI V1 EN-US
Figure 46: Difference in operating characteristic depending on operation mode when load
When FDPSPDIS (21) is set to operate together with a distance measuring zone the resultant
operate characteristic could look like in figure 47. The figure shows a distance measuring zone
operating in forward direction. Thus, the operating area is highlighted in black.
IEC05000673 V1 EN-US
Figure 47: Operating characteristic in forward direction when load encroachment is
Line distance protection REL650
Technical manual
encroachment is activated
X
"Phase selection"
"quadrilateral" zone
Distance measuring zone
activated
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Load encroachment
characteristic
R
Directional line
en05000673.vsd
Section 5
Impedance protection
93