This page requires JavaScript.









Info - Visualisation of voltage harmonics

This tool plots the voltage resulting from a load which draws any specified current waveform. The harmonic (and interharmonic) content of the current drawn by the load can be controlled, or some typical loads can be selected.

Hover the mouse over individual harmonics to edit the frequency, magnitude, phase, and sequence. The plots will change to show the effect of only the highlighted harmonic. Double-click to remove any harmonic. The total harmonic distortion (THD) is shown for the phase A waveforms; this value is only valid without interharmonics.

The source supplies 1 pu positive sequence voltage. The voltage and current values are meant to be indicative, rather than absolute. The source impedance is modelled as a resistor, to simplify the equations; this will tend to underestimate the effect of harmonics on the system voltage, compared to an inductive impedance. The effect of a reactive impedance can be emulated by selecting 'X' instead of 'R'.

Some data are taken from the NPL Power Quality Waveform Library.

This uses processing.js, and requires an HTML5 browser.

Return to main page.