ABB RELION REX640 Technical Manual page 354
Protection and control
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Also See for RELION REX640:
- Technical manual (1760 pages) ,
- Operation manual (164 pages) ,
- Engineering manual (156 pages)
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Protection functions
Cross-polarizing as polarizing quantity
Table 396: Equations for calculating angle difference for cross-polarizing method
Faulted
phases
A
B
C
A - B
B - C
C - A
The angle difference between the polarizing quantity U
is marked as φ in an example of the phasors in a single-phase earth fault where
A
the faulted phase is phase A. The polarizing quantity is rotated with 90 degrees. The
characteristic angle is assumed to be ~ 0 degrees.
354
Used
Used
Angle difference
fault
polarizi
current
ng
voltage
I
U
A
BC
ANGLE A
I
U
B
CA
ANGLE B
I
U
C
AB
ANGLE C
I
-I
U
-U
A
B
BC
CA
ANGLE A
I
-I
U
-U
B
C
CA
AB
ANGLE B
I
-I
U
-U
C
A
AB
BC
ANGLE C
_
(
U
) -
(
I
) -
=
ϕ
ϕ
A
BC
_
(
U
) -
(
I
) -
=
ϕ
ϕ
CA
B
_
(
U
) -
(
I
) -
=
ϕ
ϕ
AB
C
_
(
U
-
U
) -
=
ϕ
BC
CA
_
(
U
-
U
) -
=
ϕ
CA
AB
_
(
U
-
U
) -
=
ϕ
AB
BC
BC
1MRS759142 F
o
90
ϕ
+
RCA
(Equation 15)
o
90
ϕ
+
RCA
(Equation 16)
o
90
+
ϕ
RCA
(Equation 17)
(
I
-
I
) -
90
+
ϕ
ϕ
RCA
A
B
(Equation 18)
(
I
-
I
) -
90
+
ϕ
ϕ
RCA
B
C
(Equation 19)
(
I
-
I
) -
90
+
ϕ
ϕ
RCA
C
A
(Equation 20)
and operating quantity I
REX640
Technical Manual
o
o
o
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