ABB RED615 Technical Manual page 191

1YHT530004D05 D
615 series
Technical Manual
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 196: Equations for calculating angle difference for self-polarizing method
Faulted Used fault Used
phases current polarizing
voltage
A I U
A A
B I U
B B
C I U
C C
A - B I - I U
A B AB
B - C I - I U
B C BC
C - A I - I U
C A CA
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
operating quantity I is marked as φ. In the self-polarization method, there is no
A
need to rotate the polarizing quantity.
GUID-C648173C-D8BB-4F37-8634-5D4DC7D366FF V1 EN
Figure 89: Single-phase earth fault, phase A
Angle difference
ANGLE A _ ( U ) -
= ϕ
A
GUID-60308BBA-07F8-4FB4-A9E8-3850325E368C V2 EN
ANGLE B _ ( U ) -
= ϕ
B
GUID-9AF57A77-F9C6-46B7-B056-AC7542EBF449 V2 EN
ANGLE C _ ( U ) -
= ϕ
C
GUID-51FEBD95-672C-440F-A678-DD01ABB2D018 V2 EN
ANGLE A _ ( U ) -
= ϕ
AB
GUID-7DA1116D-86C0-4D7F-AA19-DCF32C530C4C V2 EN
ANGLE B _ ( U ) -
= ϕ
BC
GUID-3E9788CA-D2FC-4FC4-8F9E-1466F3775826 V2 EN
ANGLE C _ ( U ) -
= ϕ
CA
GUID-EFD80F78-4B26-46B6-A5A6-CCA6B7E20C6E V2 EN
Section 4
Protection functions
( I ) -
ϕ ϕ
RCA
A
( I ) -
ϕ ϕ
RCA
B
( I ) -
ϕ ϕ
C RCA
( I - I ) -
ϕ ϕ
A B RCA
( I - I ) -
ϕ ϕ
B C RCA
( I - I ) -
ϕ ϕ
C A RCA
and
A
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