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The power waveform below left is typical of what results from the operation of a couple of 1200W HMIs with non-power factor corrected ballasts on a conventional portable generator.The adverse effects of the harmonic distortion exhibited here, can take the form of overheating and failing equipment, efficiency losses, circuit breaker trips, excessive current on the neutral wire, and instability of the generator voltage and frequency.A careful plotting of induced emf through one rotation of the coil reveals that a sinusoidal voltage waveform is the natural result of the mechanical motion of a generators coils.For example, in position A on the illustration of the coil rotation, the loop is cutting no lines of force so the induced emf is zero (point 1 on the graph.) One quarter turn later, the loop is in position B.A generator produces an Electromotive Force (emf) by changing the number of Magnetic Flux Lines (Lines of Force), passing through a Wire Coil.
In the past, attention was given to portable generator features such as automatic voltage regulation and speed regulation.In position A, no flux lines are being cut since both legs are moving parallel to the lines of flux. In position B, the loop has rotated 1/4 of a turn (90).The black leg is now moving downward, and the white leg is moving upward.The mechanical energy of the moving wire is converted into the electric energy.Faraday and Henry also found that when you move a magnet in a coil of wire, electric current is generated.
Harmonic noise of this magnitude can also damage HD digital cinema production equipment, create ground loops, and possibly create radio frequency (RF) interference.