ABB RELION REX640 Technical Manual page 972

Protection functions
Z1 angle zone x (x = 1...5)
•
Factor K0 zone x (x = 1...5)
•
Factor K0 angle Zn x (x = 1...5)
•
The reach magnitude and angle are:
Angle
Z
=
1
K
=
N
In case of non-directional characteristics, the reactive reach in reverse direction is
defined with the
The total reactive reach in reverse direction includes a part which is defined by the
residual compensation factor K
same for forward and reverse direction.
Figure 546: Settings which define the line reach for phase-to-earth impedance
measuring elements if Impedance mode Zn = "Polar"
Protection zone characteristics
DSTPDIS has both "Quadrilateral" and "Mho (circular)" characteristics available for
the protection zones and they can be combined also with the bullet characteristic.
The shape of a tripping characteristic can be set independently for phase-to-earth,
phase-to-phase or three-phase impedance elements. The zone shape is defined
with the
and with the
impedance elements. The alternatives are "Quadrilateral", "Mho (circular)", "Mho Dir
line", "Offset Dir line" and "Bullet (combi)".
972
angle Z ( 1 Z K 1 )
= +
N
Z zone x 1 (cos( Z angle zone x 1
Factor K zone x 0 (cos( Factor K angle znx
Z1 reverse zone x (x = 1...5) setting.
Forward
X
α
R
Impedance Chr Gnd Zn setting for phase-to-earth impedance elements,
Impedance Chr PP Zn setting for phase-to-phase or three-phase
) j sin( Z angle zone x 1
+
0 ) j sin(
+
. The characteristic line angle, denoted as α, is the
N
Reverse
X
R
α
1MRS759142 F
(Equation 270)
(Equation 271)
))
Factor K angle z 0 n n x))
(Equation 272)
Non-directional
X
α
R
α
Technical Manual
REX640