ABB RED615 Technical Manual page 219

1YHT530004D05 D
615 series
Technical Manual
Cross-polarizing as polarizing quantity
Table 217: Equations for calculating angle difference for cross-polarizing method
Faulte Used Used
d fault polarizing
phase current voltage
s
A I U
A BC
B I U
B CA
C I U
C AB
A - B I - I U -
A B BC
U
CA
B - C I - I U -
B C CA
U
AB
C - A I - I U -
C A AB
U
BC
The angle difference between the polarizing quantity U
I is marked as φ in an example of the phasors in a single-phase earth fault where
A
the faulted phase is phase A. The polarizing quantity is rotated 90 degrees. The
characteristic angle is assumed to be ~ 0 degrees.
GUID-6C7D1317-89C4-44BE-A1EB-69BC75863474 V1 EN
Figure 107: Single-phase earth fault, phase A
Angle difference
ANGLE A _ ( U ) -
ϕ
=
BC
GUID-4F0D1491-3679-4B1F-99F7-3704BC15EF9D V3 EN
ANGLE B _ ( U ) -
ϕ
=
CA
GUID-F5252292-E132-41A7-9F6D-C2A3958EE6AD V3 EN
ANGLE C _ ( U ) -
ϕ
=
AB
GUID-84D97257-BAEC-4264-9D93-EC2DF853EAE1 V3 EN
ANGLE A _ ( U
ϕ
=
BC
GUID-AFB15C3F-B9BB-47A2-80E9-796AA1165409 V2 EN
ANGLE B _ ( U -
ϕ
=
CA
GUID-C698D9CA-9139-40F2-9097-007B6B14D053 V2 EN
_ (
ANGLE C U
ϕ
=
AB
GUID-838ECE7D-8B1C-466F-8166-E8FE16D28AAD V2 EN
Section 4
Protection functions
o
( I ) - 90
ϕ ϕ
+
A RCA
o
( I ) - 90
ϕ ϕ
+
B RCA
o
( I ) - 90
ϕ ϕ
+
RCA
C
- U ) - ( I - I ) -
ϕ ϕ
CA A B
U ) - ( I - I ) -
ϕ ϕ
AB B C
- ) - ( - ) -
U I I
ϕ ϕ
BC C A
and operating quantity
BC
o
90
+
RCA
o
90
+
RCA
o
90
+
RCA
213