Date Code 20020129
Differential, Restricted Earth Fault,
3-15
Overcurrent, Voltage, and Frequency Elements
SEL-387E Instruction Manual
that is,
(
)
3
ICWn
IBWn
IAWn
•
2
IAWnC
-
-
+
=
(
)
3
ICWn
IBWn
•
2
IAWn
IBWnC
-
+
-
=
(
)
3
ICWn
•
2
IBWn
IAWn
ICWnC
+
-
-
=
We could use this type of compensation in applications having wye-connected transformer
windings (no phase shift) with wye CT connections for each winding. Using WnCTC = 12 for
each winding removes zero-sequence components, just as connection of the CTs in delta would
do, but without producing a phase shift. (One might also use WnCTC = 1 or 11 for this same
application, yielding compensation similar to that from connection of the CTs on both sides in
DAB or DAC.)
The Complete List of Compensation Matrices (m = 1 to 12)
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
=
1
0
1
1
1
0
0
1
1
•
3
1
1
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
=
1
1
2
2
1
1
1
2
1
•
3
1
2
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
=
0
1
1
1
0
1
1
1
0
•
3
1
3
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
-
-
-
=
1
2
1
1
1
2
2
1
1
•
3
1
4
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
=
1
1
0
0
1
1
1
0
1
•
3
1
5
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
=
2
1
1
1
2
1
1
1
2
•
3
1
6
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
=
1
0
1
1
1
0
0
1
1
•
3
1
7
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
-
-
-
=
1
1
2
2
1
1
1
2
1
•
3
1
8
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
=
0
1
1
1
0
1
1
1
0
•
3
1
9
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
=
1
2
1
1
1
2
2
1
1
•
3
1
10
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
=
1
1
0
0
1
1
1
0
1
•
3
1
11
CTC
( )
[
]
ß
ß
ß
à
Þ
Ï
Ï
Ï
Ð
Î
-
-
-
-
-
-
=
2
1
1
1
2
1
1
1
2
•
3
1
12
CTC
The matrices for odd values of m (1, 3, 5, 7, 9, 11) are similarly constructed, as are the matrices
for even values of m (2, 4, 6, 8, 10, 12). Also, [CTC(m)] equals the minus of [CTC(m
±
6)],
because these matrices represent shifts separated by exactly 180 degrees.
Содержание SEL-387E
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Страница 308: ......
Страница 422: ......
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