ABB RED615 Technical Manual page 221

1YHT530004D05 D
615 series
Technical Manual
Negative-sequence voltage as polarizing quantity
When the negative voltage is used as the polarizing quantity, the angle difference
between the operating and polarizing quantity is calculated with the same formula
for all fault types:
_ = ( − ) −
ANGLE X U
ϕ ϕ
2
GUID-470263DD-C1D7-4E59-B011-24D8D35BD52A V3 EN
This means that the actuating polarizing quantity is -U
I
A
U
A
I
2
U U
CA
I
I B
U
C
2
U
U
C
BC
A
GUID-027DD4B9-5844-4C46-BA9C-54784F2300D3 V2 EN
Figure 109: Phasors in a single-phase earth fault, phases A-N, and two-phase
short circuit, phases B and C, when the actuating polarizing
quantity is the negative-sequence voltage -U2
Positive-sequence voltage as polarizing quantity
Table 218: Equations for calculating angle difference for positive-sequence quantity polarizing
method
Faulted Used fault Used
phases current polarizing
voltage
A I U
A 1
B I U
B 1
C I U
C 1
A - B I - I U
A B 1
B - C I - I U
B C 1
C - A I - I U
C A 1
( ) −
I
ϕ
RCA
2
I
C
AB
U
B
Angle difference
ANGLE A _ = ( U )
ϕ
1
GUID-4C933201-2290-4AA3-97A3-670A40CC4114 V4 EN
=
ANGLE B _ ( U )
ϕ
1
GUID-648D061C-6F5F-4372-B120-0F02B42E9809 V4 EN
ANGLE C _ = ( U )
ϕ
1
GUID-355EF014-D8D0-467E-A952-1D1602244C9F V4 EN
=
ANGLE A _ ( U )
ϕ
1
GUID-B07C3B0A-358E-480F-A059-CC5F3E6839B1 V3 EN
ANGLE B _ = ( U )
ϕ
1
GUID-4597F122-99A6-46F6-A38C-81232C985BC9 V3 EN
_ = ( )
ANGLE C U
ϕ
1
GUID-9892503C-2233-4BC5-8C54-BCF005E20A08 V3 EN
Section 4
Protection functions
.
2
U
A
I
U
A
2
I
2
U U
C B
B
− ( I ) −
ϕ ϕ
RCA
A
o
− − −
( I ) 120
ϕ ϕ
B RCA
o
− ( I ) − + 120
ϕ ϕ
C RCA
o
− − − +
( I I ) 30
ϕ ϕ
A B RCA
o
− ( I − I ) − − 90
ϕ ϕ
B C RCA
− ( − ) − + 150
I I
ϕ ϕ
RCA
C A
(Equation 2)
I
B
o
215