ABB RER620 Technical Manual page 115
Advanced recloser protection and control
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RER620
Technical Manual
Figure 46:
Two-phase short circuit, short circuit is between phases B and C
Cross-polarizing as polarizing quantity
Table 130:
Equations for calculating angle difference for cross-polarizing method
Used
Used
Faulted
fault
polarizing
phases
current
voltage
A
I
V
A
BC
B
I
V
B
CA
C
I
V
C
AB
A - B
I
- I
V
-
A
B
BC
V
CA
B - C
I
- I
V
-
B
C
CA
V
AB
C - A
I
- I
V
-
C
A
AB
V
BC
The polarizing quantity is rotated with 90 degrees. The characteristic angle is assumed to
be ~ 0 degrees.
Angle difference
=
ANGLE A
_
(
V
) -
BC
=
ANGLE B
_
(
V
) -
CA
=
ANGLE C
_
(
V
) -
AB
=
ANGLE A
_
(
V
-
BC
=
ANGLE B
_
(
V
-
CA
=
ANGLE C
_
(
V
-
AB
Section 4
Protection functions
o
+
(
I
) -
90
RCA
A
o
+
(
I
) -
90
RCA
B
o
+
(
I
) -
90
RCA
C
V
) -
(
I
-
I
) -
RCA
CA
A
B
V
) -
(
I
-
I
) -
RCA
AB
B
C
V
) -
(
I
-
I
) -
RCA
BC
C
A
o
+
90
o
+
90
o
+
90
109
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