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6
6.3 Calculating Derived Values
6.3.2
Symmetrical Components
Star connection: phase-to-earth voltages and currents
j 2Π 3 ⁄
(
With
a
=
e
Positive-sequence system:
Negative-sequence system:
Zero-sequence system
Note
The Continuous RMS-value Recorder (CRR) only records the absolute value of the
symmetrical components.
Triggering is also done using only the absolute value of the symmetrical components.
The PMU transfers the positive-sequence system as complex values!
48
)
(
– Π 3 ⁄
)
2
j 2
and
a
=
:
e
1
⋅
(
V
=
V
-- -
1
3
1
⋅
(
I
=
I
-- -
1
L1
3
1
⋅
(
V
=
V
-- -
2
3
1
⋅
(
I
=
I
-- -
2
L1
3
1
⋅
(
V
=
V
:
-- -
0
3
1
⋅
(
I
=
I
-- -
0
L1
3
2
⋅
⋅
+
a V
+
a
V
L1
L2
L3
2
⋅
⋅
)
+
a I
+
a
I
L2
L3
2
⋅
⋅
+
a
V
+
a V
L1
L2
L3
2
⋅
⋅
)
+
a
I
+
a I
L2
L3
)
+
V
+
V
L1
L2
L3
)
+
I
+
I
L2
L3
Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
)
)
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