Скачать или смотреть Interesting waveform and harmonic analysis of mains power.

Please note that the spikes and distortion here are exaggerated, due to incorrect connection. An updated recording (at a rural location) can be found at:
   • Power waveform and harmonic time-lapse  

Waveform data and harmonic content data recorded over a 33 hour period at a residential area of central London.

The time-lapse video clearly shows the diurnal cycle with greater distortion during the day, together with greater variability in the harmonic content. As is often the case, the 7th harmonic (shown here in yellow) is the most dominant, although at this address the overall harmonic content is over 10-fold higher than recordings at other sites.

The waveform is also interesting, as it has a significantly distorted shape with large 'spikes' - these can spike up to 600 V, whereas the normal 240 V AC peak would be around 340 V. You can also see smaller spikes appear and disappear away from the peak, presumably, these are spikes from phase-angle control devices.

Waveform display scale: 5 ms/div; 50 V/div
Vectorscope display: 3%/div

Music: OCRemix - Darren Izzard - Driller (Prototype mix)