Table 271: Momentary per phase direction value for monitored data view
Criterion for per phase direction information The value for DIR_A/_B/_C
The ANGLE_X is not in any of the defined sectors, or the direc-
tion cannot be defined due too low amplitude
0 = unknown
The ANGLE_X is in the forward sector 1 = forward
The ANGLE_X is in the reverse sector 2 = backward
(The ANGLE_X is in both forward and reverse sectors, that is,
when the sectors are overlapping)
3 = both
Table 272: Momentary phase combined direction value for monitored data view
Criterion for phase combined direction information The value for DIRECTION
The direction information (DIR_X) for all phases is unknown 0 = unknown
The direction information (DIR_X) for at least one phase is
forward, none being in reverse
1 = forward
The direction information (DIR_X) for at least one phase is
reverse, none being in forward
2 = backward
The direction information (DIR_X) for some phase is forward
and for some phase is reverse
3 = both
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 273: 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
B I
B
U
B
ANGLE B U I
B
B
RCA
_ ( ) - ( ) - =
ϕ ϕ ϕ
C I
C
U
C
ANGLE C U I
C
C
RCA
_ ( ) - ( ) - =
ϕ ϕ ϕ
A - B I
A
- I
B
U
AB
ANGLE A U I I
AB
A B
RCA
_ ( ) - ( - ) - =
ϕ ϕ ϕ
B - C I
B
- I
C
U
BC
ANGLE B U I I
BC
B C
RCA
_ ( ) - ( - ) - =
ϕ ϕ ϕ
C - A I
C
- I
A
U
CA
ANGLE C U I I
CA
C A
RCA
_ ( ) - ( - ) - =
ϕ ϕ ϕ
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.
1MRS757644 H
Protection functions
620 series
Technical Manual
281
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