R
X
Distance measuring zone
Directional line
Load encroachment
characteristic
"Phase selection"
"quadrilateral" zone
en05000673.vsd
IEC05000673 V1 EN
Figure 58:
Operating characteristic in forward direction when load encroachment is
activated
Figure
is valid for phase-to-ground. During a three-phase fault, or load, when the
quadrilateral phase-to-phase characteristic is subject to enlargement and rotation the
operate area is transformed according to figure
. Due to the 30-degree rotation, the angle
of the blinder in quadrant one is now 90 degrees instead of the original 60 degrees. The
blinder that is nominally located to quadrant four will at the same time tilt outwards and
increase the resistive reach around the R-axis. Consequently, it will be more or less
necessary to use the load encroachment characteristic in order to secure a margin to the
load impedance.
1MRK 506 335-UUS A
Section 6
Impedance protection
139
Technical manual
Содержание REL650 series
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