ABB ret650, Technical Manual

Page: 133 / 670

RLdInFw = kLdRFw·RLdOutFw
EQUATION1185 V2 EN
(Equation 32)
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
ArgLd .
The load encroachment in the fourth quadrant uses the same settings as in the first
quadrant (same
ArgLd and RLdOutFw and calculated value RLdInFw).
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
X1InFw and the line resistance
for the inner boundary R1LIn . The fault resistance coverage for the inner boundary is
set by the parameter R1FInFw .
From the setting parameter RLdOutFw and the calculated value RLdInFw a distance
between the inner and outer boundary,
D
Fw, is calculated. This value is valid for R
direction in first and fourth quadrant and for X direction in first and second quadrant.
7.1.6.2 Resistive reach in reverse direction
To avoid load encroachment in reverse direction, the resistive reach is limited by
setting the parameter
RLdOutRv for the outer boundary of the load encroachment
zone. The distance to the inner resistive load boundary RLdInRv is determined by
using the setting parameter
kLdRRv in equation 33 .
RLdInRv = kLdRRv·RLdOutRv
EQUATION1187 V2 EN
(Equation 33)
where:
kLdRRv is a settable multiplication factor less than 1
From the setting parameter RLdOutRv and the calculated value RLdInRv, a distance
between the inner and outer boundary,
D
Rv, 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
R1FInRv for the inner
boundary. The outer boundary is internally calculated as the sum of
D
Rv+ R1FInRv.
The inner resistive characteristic in the third quadrant outside the load encroachment
zone consist of the sum of the settings
R1FInRv and the line resistance R1LIn . The
1MRK 504 135-UEN A
Section 7
Impedance protection
127
Technical manual