ABB RELION REX640 Technical Manual page 352

Protection functions
Criterion for per phase direction information
The ANGLE_X is in the reverse sector
(The ANGLE_X is in both forward and reverse sectors, that is,
when the sectors are overlapping)
Table 394: Momentary phase combined direction value for monitored data view
Criterion for phase combined direction information
The direction information (DIR_X) for all phases is unknown
The direction information (DIR_X) for at least one phase is
forward, none being in reverse
The direction information (DIR_X) for at least one phase is
reverse, none being in forward
The direction information (DIR_X) for some phase is forward
and for some phase is reverse
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 395: Equations for calculating angle difference for self-polarizing method
Faulted
phases
A
B
C
A - B
B - C
C - A
352
Used Used Angle difference
fault polarizi
current ng
voltage
I U
ANGLE A
A A
I U
ANGLE B
B B
I U
ANGLE C
C C
I -I
U
A B
ANGLE A
AB
I -I
U
B C
ANGLE B
BC
I -I
U
C A
ANGLE C
CA
_ ( U ) - ( I ) -
= ϕ ϕ
A A
_ ( U ) - ( I ) -
= ϕ ϕ
B B
_ ( U ) - ( I ) -
= ϕ ϕ
C
C
U I
_ ( ) - ( -
= ϕ ϕ
A
AB
_ ( U ) - ( I -
= ϕ ϕ
BC B
_ ( U ) - ( I -
= ϕ ϕ
CA C
1MRS759142 F
The value for DIR_A/_B/_C
2 = backward
3 = both
The value for DIRECTION
0 = unknown
1 = forward
2 = backward
3 = both
ϕ
RCA
(Equation 9)
ϕ
RCA
(Equation 10)
ϕ
RCA
(Equation 11)
I
) -
ϕ
RCA
B
(Equation 12)
I ) -
ϕ
RCA
C
(Equation 13)
I ) -
ϕ
RCA
A
(Equation 14)
REX640
Technical Manual