YOKOGAWA WT1800 User Manual page 137

DC power U1 and I1
Input element 1
Input element 2
Input element 3
• Power Transformer with Single-Phase AC Input and Three-Phase AC Output
If you are using the connections shown in the figure below to measure a device that converts
single-phase AC power to three-phase AC power, set the synchronization source of input
elements on the input end to the same signal and do the same for input elements on the output
end.
In this example, set the synchronization source of input element 1 to U1 (or I1), and set the
synchronization source of input elements 2 and 3 to U2 (or I2, U3, or I3).
In this case, AC signals of different frequencies are measured. If the synchronization source of all
input elements is set to the same signal, the measurement period of either the input signal or the
output signal will not be an integer multiple of the signal.
• Single-phase AC power: Connect to input element 1.
• Three-phase AC power: Connect to input elements 2 and 3 using a three-phase, three-wire
system.
AC power U1 and I1
Input element 1
Input element 2
Input element 3
Note
• The measurement period for determining the numeric data of the peak voltage or peak current is the
entire span of the data update interval, regardless of the measurement period settings discussed above.
Therefore, the measurement period for the measurement functions that are determined using the
maximum voltage or current value (U+pk, U-pk, I+pk, I-pk, CfU, and CfI) is also the entire span of the data
update interval.
• For details on the measurement period for measurement functions related to harmonic measurement, see
the features guide.
IM WT1801-03EN
Power transformer
Synchronization Source Setup Example
U2 (or I2, U3, or I3)
Power transformer
Synchronization Source Setup Example
U1 (or I1)
U2 (or I2, U3, or I3)
Appendix 5 Setting the Measurement Period
AC power U2 and I2
AC power U3 and I3
AC power U2 and I2
AC power U3 and I3
1
2
3
4
5
6
App
Index
App-31