Section 4
1MAC050144-MB C
Protection functions
138
615 series ANSI
Technical Manual
Self-polarizing as polarizing method
Table 121: Equations for calculating angle difference for self-polarizing method
In an example case of the phasors in a single-phase ground fault where the faulted phase
is phase A, the angle difference between the polarizing quantity V
A
and operating quantity
I
A
is marked as
φ
. In the self-polarization method, there is no need to rotate the polarizing
quantity.
Figure 58:
Single-phase ground fault, phase A
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 V
BC
and
operating quantity I
B
- I
C
in the self-polarizing method.
Faulted
phases
Used
fault
current
Used
polarizing
voltage
Angle difference
A
I
A
V
A
B
I
B
V
B
C
I
C
V
C
A - B
I
A
- I
B
V
AB
B - C
I
B
- I
C
V
BC
C - A
I
C
- I
A
V
CA
ANGLE A
V
I
A
A
RCA
_
(
) -
(
) -
=
ANGLE B
V
I
B
B
RCA
_
(
) -
(
) -
=
ANGLE C
V
I
C
C
RCA
_
(
) -
(
) -
=
ANGLE A
V
I
I
AB
A
B
RCA
_
(
) -
(
-
) -
=
ANGLE B
V
I
I
BC
B
C
RCA
_
(
) -
(
-
) -
=
ANGLE C
V
I
I
CA
C
A
RCA
_
(
) -
(
-
) -
=
Содержание 615 Series ANSI
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Страница 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Страница 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
Страница 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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