Overview Of The Power Analysis Function - YOKOGAWA DL7440 User Manual

1 Overview of the Power Analysis Function

Correcting (Deskewing) the Difference in the Transfer Time of Analyzed Signals
Automated Measurement and Statistical Processing of Power Analysis Parameters
Automated Measurement of Power Analysis Parameters on Dual Areas
Statistical Processing
4
To correctly measure the analysis parameters (power analysis parameters) such as
power, impedance, power factor, watt hour, and ampere hour from the voltage and
current under analysis, the voltage and current signals must be applied to the signal
input terminals of the DL7400 with no difference in the transfer time. However,
difference in the transfer time may occur between signals depending on the probe that is
being used. When the probe* and deskew correction signal source are connected, the
DL7400 can correct (deskew) the difference in the transfer time of the signals
automatically or manually and measure the power analysis parameters.
* It is recommended that YOKOGAWA products listed below be used to execute deskew and
measure the power analysis parameters.
Deskew correction signal source
Passive probe
Differential probe
Current probe
As with the standard measurement parameters (waveform parameters), the following
power analysis parameters (waveform parameters) can be measured automatically on
the displayed waveform (within the display record length).
Voltage
Current
Power
Power factor
Impedance
Watt hour
Ampere hour
Heat energy
As with the standard measurement parameters, you can specify two areas and perform
automated measurement of power analysis parameters on each area. For details on the
function and procedural explanations, see section 10.8 in the DL7440/DL7480 User's
Manual IM701450-01E .
As with the standard measurement parameters, you can perform statistical processing
on the measured values of power analysis parameters. Normal statistical processing,
statistical processing per cycle, and statistical processing of history data are available.
For details on the function and procedural explanations, see section 10.7 in the DL7440/
DL7480 User's Manual .
Model 701935
Model 700988
Model 700924 or 701921
Model 700937
Amplitude UP-P, maximum value U+pk, minimum value U-pk, DC
component Udc, rms value Urms, AC component Uac, rectified mean
value calibrated to the rms value Umn, and rectified mean value Urmn
Amplitude IP-P, maximum value I+pk, minimum value I-pk, DC
component Idc, rms value Irms, AC component Iac, rectified mean
value calibrated to the rms value Imn, and rectified mean value Irmn
Apparent power S, active power P, and reactive power Q
Power factor λ of the circuit under measurement
Impedance Z of the circuit under measurement
Sum of positive and negative watt hours Wp, sum of positive watt
hours Wp+, and sum of negative watt hours Wp-
Sum of positive and negative ampere hours q, sum of positive ampere
hours q+, and sum of negative ampere hours q-
2
Joule integral I t
IM 701450-61E