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6.5.5
Interharmonics
The "Interharmonics“ card is used to display all current and voltage interharmonics up to 2,500
Hz online. The measurement data is calculated by the measuring device in accordance with
IEC61000-4-30 Class A following the grouping process and transferred to the PC.
There are three bar charts available:
0 Interharmonic voltages conductor-earth
0 Interharmonic voltages conductor-earth
0 Interharmonic currents
If an interharmonic is selected with the mouse pointer, this measurement value is displayed in
the field on the top right.
1 Explanation of the grouping process in accordance with the IEC:
To evaluate the interharmonics in the grid, subgroups are created. In each case, all of the
interharmonics between two harmonics are combined into one harmonics subgroup.
Example for 50Hz: Interharmonic H2 includes all frequencies from 110Hz to 140Hz.
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