Reactive Reach In Forward And Reverse Direction; Basic Detection Logic - ABB Relion 670 Series Technical Reference Manual

Section 6
Impedance protection
6.11.2.3
6.11.2.4
350
From the setting parameter RLdOutRv and the calculated value RLdInRv, a distance
between the inner and outer boundary, DRv, 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 DRv+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 DRv.

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 + DFw,
where:
RLdOutFw - KLdRFw · RLdOutFw
DFw =
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 + DRv.
where:
RLdOutRv - KLdRRv · RLdOutRv
DRv =

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
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
DET1of3 and DET2of3.
185 presents a composition of an internal detection signal DET-
186 presents a composition of the detection signals
1MRK505222-UUS C
Technical reference manual