YOKOGAWA WT500 User Manual page 348

Appendix 5 Setting the Measurement Period
App-28
DC power U1 and I1
Synchronization Source Setup Example
Input element 1
Input element 2
Input element 3
• Power Transformer with Single-Phase AC Input and Three-Phase AC Output
If a device that converts single-phase AC power to three-phase AC power is connected
and measured as shown in the figure below, 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
Synchronization Source Setup Example
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.
• The measurement period of harmonic measurement functions is from the beginning of the
data update interval to 1024 points at the harmonic sampling frequency, regardless of the
measurement period settings discussed above.
AC power U2 and I2
AC power U3 and I3
Power transformer
U2 (or I2, U3, or I3)
AC power U2 and I2
AC power U3 and I3
Power transformer
U1 (or I1)
U2 (or I2, U3, or I3)
IM 760201-01E