ABB Relion 650 Series Technical Manual page 148

Section 5
Impedance protection
RLdInFw = kLdRFw·RLdOutFw
EQUATION1185 V2 EN-US
where:
kLdRFw is a settable multiplication factor less than 1
The slope of the load encroachment inner and outer boundary is defined by setting the parameter
LdAngle .
The load encroachment in the fourth quadrant uses the same settings as in the first quadrant
LdAngle and RLdOutFw and calculated value RLdInFw).
(same
The quadrilateral characteristic in the first quadrant is tilted to get a better adaptation to the
distance measuring zones. The angle is the same as the line angle and derived from the setting of
the reactive reach inner boundary
fault resistance coverage for the inner boundary is set by the parameter
From the setting parameter
inner and outer boundary, DFw, is calculated. This value is valid for R direction in first and fourth
quadrant and for X direction in first and second quadrant.
5.7.6.2 Resistive reach in reverse direction
To avoid load encroachment in reverse direction, the resistive reach is limited by setting the
parameter
inner resistive load boundary RLdInRv is determined by using the setting parameter
equation 28.
RLdInRv = kLdRRv·RLdOutRv
EQUATION1187 V2 EN-US
where:
kLdRRv is a settable multiplication factor less than 1
From the setting parameter
inner and outer boundary, DRv, is calculated. This value is valid for R direction in second and third
quadrant and for X direction in third and fourth quadrant.
The inner resistive characteristic in the second quadrant outside the load encroachment part
corresponds to the setting parameter
internally calculated as the sum of DRv+
The inner resistive characteristic in the third quadrant outside the load encroachment zone
consist of the sum of the settings
lines outside the load encroachment is the same as the tilted lines in the first quadrant. The
distance between the inner and outer boundary is the same as for the load encroachment in
reverse direction, that is DRv.
142
X1InFw and the line resistance for the inner boundary R1LIn . The
RLdOutFw and the calculated value RLdInFw a distance between the
RLdOutRv for the outer boundary of the load encroachment zone. The distance to the
RLdOutRv and the calculated value RLdInRv, a distance between the
R1FInRv and the line resistance R1LIn . The angle of the tilted
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R1FInRv for the inner boundary. The outer boundary is
R1FInRv.
1MRK 506 326-UUS B
(Equation 27)
R1FInFw .
M13877-15 v3
kLdRRv in
(Equation 28)
Line distance protection REL650
Technical manual