ABB RER620 Technical Manual page 114
Advanced recloser protection and control
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Section 4
Protection functions
108
Self-polarizing as polarizing method
Table 129:
Equations for calculating angle difference for self-polarizing method
Used
Used
Faulted
fault
polarizing
phases
current
voltage
A
I
V
A
A
B
I
V
B
B
C
I
V
C
C
A - B
I
- I
V
A
B
AB
B - C
I
- I
V
B
C
BC
C - A
I
- I
V
C
A
CA
In an example case of the phasors in a single-phase ground fault where the faulted phase
is phase A, the angle difference between the polarizing quantity V
I
is marked as φ. In the self-polarization method, there is no need to rotate the polarizing
A
quantity.
Figure 45:
Single-phase ground fault, phase A
In an example case of a two-phase short-circuit failure where the fault is between phases
B and C, the angle difference is measured between the polarizing quantity V
operating quantity I
- I
B
C
Angle difference
=
ANGLE A
_
(
V
) -
A
=
ANGLE B
_
(
V
) -
B
=
ANGLE C
_
(
V
C
=
ANGLE A
_
(
V
AB
=
ANGLE B
_
(
V
BC
=
ANGLE C
_
(
V
CA
in the self-polarizing method.
1MAC309294-MB F
(
I
) -
A
RCA
(
I
) -
B
RCA
) -
(
I
) -
C
RCA
) -
(
I
-
I
) -
A
B
RCA
) -
(
I
-
I
) -
RCA
B
C
) -
(
I
-
I
) -
RCA
C
A
and operating quantity
A
Technical Manual
and
BC
RER620
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