ROOTECH ACCURA 3300E, User Manual

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Accura 3300E User Guide Chapter 4 Measurements
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2015 Rootech Inc. All Rights Reserved
Page 73
V
A
V
B
V
C
V
A
= V
1
–
V
n
V
B
= V
2
–
V
n
V
C
= V
3
–
V
n
V
2
V
3
V
1
V
n
: Voltage of virtual
center
point
Calculation of
virtual line to neutral
voltage
▶
Calculating virtual line to neutral voltage
based on virtual center point voltage.
V
A
= V1 – Vn
V
B
= V2
–
Vn
V
C
= V3 – Vn
The residual voltage of virtual line to neutral
voltage is 0.
Calculation of line
to line voltage
V
AB
= V
A
– V
B
= V1 – V2
V
BC
= V
B
– V
C
= V2 – V3
V
CA
= V
C
– V
A
= V3
–
V1
Provided Measurement Data
Item L-N Voltage [rms] L-L Voltage [rms] Current [rms] Active Power
Phase A
V
A
V
AB
I
A
(I1)
P
A
= V
A
* I
A
* PF
A
Phase B V
B
V
BC
I
B
(I2) P
B
= V
B
* I
B
* PF
B
Phase C V
C
V
CA
I
C
(I3) P
C
= V
C
* I
C
* PF
C
Average/ Total (V
A
+V
B
+V
C
)/3 (V
AB
+V
BC
+V
CA
)/3 (I
A
+I
B
+I
C
)/3 P
A
+P
B
+P
C
In 3P3W voltage connection, as there is not real neutral point, only line to line voltage and total
power can be measured directly, and voltage and power for each phase cannot be measured.
However, by calculating the virtual center point that residual voltage of line to neutral voltage in
three phases and considering this as a new neutral point, voltage and power for each phase are
measured by Accura 3300E.
V
N
Vn