ABB RELION 650 SERIES, Technical Manual

Page: 132 / 942

RLdInFw = kLdRFw·RLdOutFw
EQUATION1185 V2 EN-US
(Equation 12)
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.
6.2.6.2 Resistive reach in reverse direction
M13877-15 v3
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 13 .
RLdInRv = kLdRRv·RLdOutRv
EQUATION1187 V2 EN-US
(Equation 13)
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.
Section 6
1MRK 506 382-UEN A
Impedance protection
126 Line distance protection REL650 2.2 IEC
Technical manual