ABB Relion RES670, Technical Manual

Page: 156 / 934

7.1.6.2 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 6 .
RLdInRv = kLdRRv·RLdOutRv
EQUATION1187 V2 EN-US
(Equation 6)
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
angle of the tilted 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
D
Rv.
7.1.6.3 Reactive reach in forward and reverse direction
M13877-20 v3
The inner characteristic for the reactive reach in forward direction correspond to the
setting parameter
X1InFw and the outer boundary is defined as X1InFw +
D
Fw,
where:
D Fw =
RLdOutFw - KLdRFw · RLdOutFw
The inner characteristic for the reactive reach in reverse direction correspond to the
setting parameter
X1InRv for the inner boundary and the outer boundary is defined as
X1InRv +
D
Rv.
where:
D
Rv =
RLdOutRv - KLdRRv · RLdOutRv
Section 7
1MRK 511 408-UUS A
Impedance protection
150 Phasor measurement unit RES670 2.2 ANSI
Technical manual