ABB RELION REX640 Technical Manual page 897

1MRS759142 C
REX640
Technical Manual
In case of non-directional characteristics, the reactive reach in reverse direction is
defined with the X1 reverse zone x (x = 1...5) setting. The characteristic line angle,
denoted as α, is the same for both forward and reverse direction.
Forward
X
X1 zone x
R1 zone x R
GUID-07C56E50-42D3-441A-A1EC-A5CE4328E599 V1 EN
Figure 483: Settings which define the line reach for phase-to-phase or three-
phase impedance measuring elements if Impedance mode Zn =
"Rectangular"
In case of phase-to-earth impedance measuring elements, the line reach is defined
with:
Resistive reach: (2 ⋅ R1 zone x + R0 zone x)/3, (x = 1...5)
•
Reactive reach: (2 ⋅ X1 zone x + X0 zone x)/3, (x = 1...5)
•
Forward
X
⋅
(2 X1 zone x + X0 zone x)/3
GUID-94FDF356-8ED2-4430-8D4F-6D820275BAC7 V1 EN
Figure 484: Settings which define the line reach for phase-to-earth impedance
measuring elements if Impedance mode Zn = "Rectangular", forward
or reverse directionality
Reverse
X
-R1 zone x
R
-X1 zone x
R
Section 4
Protection functions
Non-directional
X
X1 zone x
α
R1 zone x
α
-X1 reverse zone x
Reverse
X
R
⋅
-(2 X1 zone x + X0 zone x)/3
R
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