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FAULT_DIR gives the detected direction of the fault during fault situations, that is,
when the START output is active.
Self-polarizing as polarizing method
Table 241:
Equations for calculating angle difference for self-polarizing method
Faulted
phases
Used fault
current
Used
polarizing
voltage
Angle difference
A
I
A
U
A
ANGLE
A
U
I
A
A
RCA
_
(
) -
(
) -
=
ϕ
ϕ
ϕ
GUID-60308BBA-07F8-4FB4-A9E8-3850325E368C V2 EN
B
I
B
U
B
ANGLE
B
U
I
B
B
RCA
_
(
) -
(
) -
=
ϕ
ϕ
ϕ
GUID-9AF57A77-F9C6-46B7-B056-AC7542EBF449 V2 EN
C
I
C
U
C
ANGLE
C
U
I
C
C
RCA
_
(
) -
(
) -
=
ϕ
ϕ
ϕ
GUID-51FEBD95-672C-440F-A678-DD01ABB2D018 V2 EN
A - B
I
A
- I
B
U
AB
ANGLE
A
U
I
I
AB
A
B
RCA
_
(
) -
(
-
) -
=
ϕ
ϕ
ϕ
GUID-7DA1116D-86C0-4D7F-AA19-DCF32C530C4C V2 EN
B - C
I
B
- I
C
U
BC
ANGLE
B
U
I
I
BC
B
C
RCA
_
(
) -
(
-
) -
=
ϕ
ϕ
ϕ
GUID-3E9788CA-D2FC-4FC4-8F9E-1466F3775826 V2 EN
C - A
I
C
- I
A
U
CA
ANGLE
C
U
I
I
CA
C
A
RCA
_
(
) -
(
-
) -
=
ϕ
ϕ
ϕ
GUID-EFD80F78-4B26-46B6-A5A6-CCA6B7E20C6E V2 EN
In an example case of the phasors in a single-phase earth fault where the faulted phase
is phase A, the angle difference between the polarizing quantity U
A
and operating
quantity I
A
is marked as φ. In the self-polarization method, there is no need to rotate
the polarizing quantity.
GUID-C648173C-D8BB-4F37-8634-5D4DC7D366FF V1 EN
Figure 125:
Single-phase earth fault, phase A
Section 4
1MRS758755 A
Protection functions
232
REC615 and RER615
Technical Manual
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