ABB RELION REX640, Technical Manual, Page: 972 / 1960

•
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:
(Equation 270)
Angle angle Z Z K
N
= +
( ) 1 1
(Equation 271)
Z Z zone x Z angle zone x j Z angle zone x
1
1 1 1
= +
(cos( ) sin( ))
K Factor K zone x Factor K angle znx j Factor K angle z
N
= +
0 0 0 (cos( ) sin( n nx ))
In case of non-directional characteristics, the reactive reach in reverse direction is
defined with the Z1 reverse zone x (x = 1...5) setting.
(Equation 272)
The total reactive reach in reverse direction includes a part which is defined by the
residual compensation factor K
N
. The characteristic line angle, denoted as α, is the
same for forward and reverse direction.
X
R
Forward
X
R
Reverse
X
R
Non-directional
α
α
α
α
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
Impedance Chr Gnd Zn setting for phase-to-earth impedance elements,
and with the
Impedance Chr PP Zn setting for phase-to-phase or three-phase
impedance elements. The alternatives are "Quadrilateral", "Mho (circular)", "Mho Dir
line", "Offset Dir line" and "Bullet (combi)".
Protection functions 1MRS759142 F
972 REX640
Technical Manual