ABB RELION 620 Series Technical Manual page 300
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Also See for RELION 620 Series:
- Technical manual (1224 pages) ,
- Operation manual (152 pages) ,
- Applications manual (90 pages)
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Section 4
Protection functions
294
In an example case of a two-phase short circuit failure where the fault is between
phases B and C, the angle difference is measured between the polarizing quantity U
and operating quantity I
GUID-65CFEC0E-0367-44FB-A116-057DD29FEB79 V1 EN
Figure 145:
Two-phase short circuit, short circuit is between phases B and C
Cross-polarizing as polarizing quantity
Table 298:
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
marked as φ in an example of the phasors in a single-phase earth fault where the
- I
in the self-polarizing method.
B
C
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
1MRS757644 F
o
) -
(
) -
90
I
ϕ
ϕ
+
RCA
A
o
) -
(
I
) -
90
ϕ
ϕ
+
RCA
B
o
) -
(
I
) -
90
ϕ
ϕ
+
C
RCA
-
U
) -
(
I
-
I
) -
ϕ
A
B
CA
-
U
) -
(
I
-
I
) -
ϕ
B
C
AB
-
U
) -
(
I
-
I
) -
ϕ
BC
C
A
and operating quantity I
BC
Technical Manual
BC
o
90
ϕ
+
RCA
o
90
ϕ
+
RCA
o
90
ϕ
+
RCA
is
A
620 series
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