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8 Operation at Use of a PC
8.4 Value View and Evaluation
not necessary to activate the parameter set. It helps to filter out other harmonics which are not interested by
customer.
For a prevailing ratio below 0.8, the corresponding harmonic is not stable, which will be showed as red color.
If one of the spectral lines ±5 Hz of the frequency of the harmonic is greater than 2 % of the RMS value of the
harmonic, the corresponding value is displayed in blue as indication.
Displaying Voltage and Current Harmonics
Current and voltage harmonics can be displayed as a Table or as a Diagram. Select the desired display form
in the Measurement output list box. Click Display to confirm the selection.
Table
(see Figure 8-74)
The parameters given in the Measured value/Unit columns mean the following:
•
THDS voltage [%]: Subgroup total harmonic distortion: ratio of the r.m.s. value of the harmonic subgroups
to the r.m.s. value of the subgroup associated with the fundamental
•
THDR [%]: Total harmonic distortion related to the total RMS value in %
•
THD-2650 [%]: Total upper band Harmonics Distortion (26th to 50th) related to the fundamental in %
•
K-factor [-]: K-factor is a weighting of the harmonic load currents according to their effects on transformer
heating.
•
Harmonics Magnitude [%]: Harmonic magnitudes in %
•
Harmonics Angle [°]: Harmonic phase angle in °
•
Harmonics PreAngle [°]: Prevailing phase angle in °
•
Harmonics PR [-]: Prevailing ratio
Diagram
The voltage- or current-harmonics diagram only shows the RMS values of the harmonic.
Figure 8-75
224
Example for a Voltage-Harmonic Diagram
SICAM Q100, 7KG95xx, Device Manual
E50417-H1040-C522-A4, Edition 03.2018
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