This means that the actuating polarizing quantity is -U
2
.
U
A
U
B
U
C
U
BC
U
AB
U
CA
I
A
I
B
I
C
U
2
I
2
U
A
U
B
U
C
I
A
I
B
I
C
U
2
I
2
A
B
GUID-027DD4B9-5844-4C46-BA9C-54784F2300D3 V2 EN
Figure 129: 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 243: Equations for calculating angle difference for positive-sequence quantity polarizing
method
Faulted
phases
Used fault
current
Used
polarizing
voltage
Angle difference
A I
A
U
1
ANGLE A U I
A
RCA
_ ( ) ( )= − −
ϕ ϕ ϕ
1
GUID-4C933201-2290-4AA3-97A3-670A40CC4114 V4 EN
B I
B
U
1
ANGLE B U I
B
RCA
_ ( ) ( )= − − −
ϕ ϕ ϕ
1
120
o
GUID-648D061C-6F5F-4372-B120-0F02B42E9809 V4 EN
C
I
C
U
1
ANGLE C U I
C
RCA
_ ( ) ( )= − − +
ϕ ϕ ϕ
1
120
o
GUID-355EF014-D8D0-467E-A952-1D1602244C9F V4 EN
A - B
I
A
- I
B
U
1
ANGLE A U I I
A B
RCA
_ ( ) ( )= − − − +
ϕ ϕ ϕ
1
30
o
GUID-B07C3B0A-358E-480F-A059-CC5F3E6839B1 V3 EN
B - C
I
B
- I
C
U
1
ANGLE B U I I
B C
RCA
_ ( ) ( )= − − − −
ϕ ϕ ϕ
1
90
o
GUID-4597F122-99A6-46F6-A38C-81232C985BC9 V3 EN
C - A
I
C
- I
A
U
1
ANGLE C U I I
C A
RCA
_ ( ) ( )= − − − +
ϕ ϕ ϕ
1
150
o
GUID-9892503C-2233-4BC5-8C54-BCF005E20A08 V3 EN
Section 4 1MRS758755 A
Protection functions
236 REC615 and RER615
Technical Manual
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