triplen harmonics

From http://ecmweb.com/mag/electric_fundamentals_harmonics/ :
Triplen harmonics. Electronic equipment generates more than one harmonic frequency. For example, computers generate 3rd, 9th, and 15th harmonics. These are known as triplen harmonics. They are of a greater concern to engineers and building designers because they do more than distort voltage waveforms. They can overheat the building wiring, cause nuisance tripping, overheat transformer units, and cause random end-user equipment failure.
Of importance in our industry as they're responsible for, in a three phase, Wye-connected system, current on the neutral that can exceed any one line current by as much as 130% when used with Dimmer, phase control.

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