ABB Relion 670 series, Technical Reference Manual

Page: 356 / 1232

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.
6.11.2.3 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
6.11.2.4 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 .
ZMRPSB (68) function can operate in two operating modes:
• The 1 out of 3 operating mode is based on detection of power swing in any of the
three phases. Figure 185 presents a composition of an internal detection signal DET-
A in this particular phase.
• The 2 out of 3 operating mode is based on detection of power swing in at least two
out of three phases. Figure 186 presents a composition of the detection signals
DET1of3 and DET2of3.
Section 6
1MRK505222-UUS C
Impedance protection
350
Technical reference manual