Lamp dimmer pollutes the mains electricity supply
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Uploaded by ChumpusRex on Jan 28, 2012
This video shows the severely distorted current waveform taken by a conventional phase-angle control tungsten incandescent lamp dimmer.
Not only does the dimmer add a lagging phase shift to the current waveform, but it causes severe harmonic distortion leading to substantial harmonic currents.
Installations with large numbers of high-powered lamp dimmers (e.g. theatres) need to take precautions to avoid causing excessive pollution of the mains supply, including overheating electricity company transformers due to excessive harmonic production
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Interesting.
FrontSideBus 3 weeks ago