ABB RELION Series Technical Manual page 242

Section 4
Protection functions
236
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 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 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
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
1MRS758755 A
.
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
( ) 30
I I
− ϕ − − ϕ +
RCA
A B
o
( I I ) 90
− ϕ − − ϕ −
B C RCA
( I I ) 150
− ϕ − − ϕ +
C A RCA
REC615 and RER615
Technical Manual
I
B
o