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The voltage and current measurement on the primary and secondary side may be different for the
reason of the instrumentation and the high frequency wave. Refer to following diagram for
measurement of single phase units.
A1
Different kinds of
instrument
Measurement
Input voltage
VI
Input current
Ii
Input power
Pi
Input power factor
PFi
Output voltage
Vo
Output Current
Io
Measurement
Output power
Po
Output power factor
PFo
Voltage Current Measurement
W1
V1
Measuring point
V1
A1
W1
Calculate power factor by the input voltage, input current and input power
V4
V5
V6
A5
A4
A6
Measuring point
W3
W4
L1
T1
A4
(R)
(U)
L2
T2
A5
(S)
(V)
T3
A6
(W)
Instrument
Moving-iron
Moving-iron
Power-meter
Rectifier
(Moving-iron not
allowed)
Moving-iron
Instrument
Power-meter
43
W3
V4
V5
W4
V6
NOTE
(Measurement criterion)
P=W1
Maximum voltage difference
between wires under 3%
Under VAT20 rated current
NOTE
(Measurement criterion)
Po=W3+W4
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