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
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
7.1.6.4
Basic detection logic
The operation of the Power swing detection ZMRPSB (68) is only released if the
magnitude of the current is above the setting of the min operating current,
IMinPUPG
.
•
The
1 out of 3
operating mode is based on detection of power swing in any of the three
presents a composition of an internal detection signal DET-A in
this particular phase.
Signals ZOUT_n (outer boundary) and ZIN_n (inner boundary) in figure
are related to
the operation of the impedance measuring elements in each phase separately (
n
represents
the corresponding A, B and C). They are internal signals, calculated by ZMRPSB (68)
function.
Section 7
1MRK 502 048-UUS A
Impedance protection
156
Technical manual
