Technical description
4 Measurement functions
4.10 Symmetric components
VM259.EN007
VAMP 24h support phone +358 (0)20 753 3264
195
Example 2, two phase injection with adjustable phase angle
U
N
= 100 V
Injection:
U
L1
= U
L1
= 100/
3 V
0° = 57.7 V
0°
U
L2
= U
L2
= 100/
3 V
120° = 57.7 V
120°
U
L3
= U
L3
= 0 V
This is actually identical case with example 2 because the
resulting line-to-line voltages U
L12
= U
L1
– U
L2
= 100 V
30°
and U
L23
= U
L2
– U
L3
= U
L2
= 100/
3 V
120° are the same as
in example 2. The only difference is a +30° phase angle
difference, but without any absolute angle reference this phase
angle difference is not seen by the device.
60
2
.
19
0
5
.
38
60
2
.
19
60
100
0
200
60
100
3
3
1
120
100
0
100
0
100
0
100
120
100
0
100
3
3
1
0
120
3
100
0
3
100
1
1
1
1
1
3
1
2
2
2
1
0
a
a
a
a
U
U
U
U
0
= 19.2 %
U
1
= 38.5 %
U
2
= 19.2 %
U
2
/U
1
= 50 %