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DFSBP series three times harmonic generator maintenance is simple, low cost, long life, and is an ideal alternative frequency generator.

Combination of three single-phase Transformers: original Star-shaped connection, side opening triangular, when the core is not saturated, its main magnetic flux must be flat-topped waves. Because the flux of flat-topped waveform has a larger component of the third harmonic magnetic energy f 3, harmonic frequency F3=3f1 magnetic flux of the group three times, third harmonic EMF level main magnetic induction.

Since the original side for Star connection, side for the open delta connection, iron core becomes saturated, no-load current I is the apex, apart from the base, which also contains higher harmonics. I in its harmonic amplitude is large, because the edge opening, three-phase fundamental components cancel each other out, leaving only the third harmonic output.

Total voltage output is tuned into resonance with 150Hz power to achieve. When high voltage resonant scream of some to serve normal.