Harmonic filter
Harmonic filter
(OP)
hello, i wonder why is a harmonic filter designed as a series reactor with pfc capacitors and this reactor filters at one frequency (189, 215 hz). what if we design reactors and connect them as shunts to the common pfc busbar and they filter only unwanted and dominant ones? can u explain pls..






RE: Harmonic filter
One speicific reason I can think of for using a notch filter (typical harmonic filter for power systems) is to not interfere with possible power line carrier. It is interesting to note, however, that power line carrier systems also have filters to keep their signals out of where they're not supposed to be (wavetraps).
RE: Harmonic filter
Basically the series reactor in a harmonic trap detunes the parallel circuit containing the caps with respect to the source. So source harmonics are not loading the trap circuit. The trap circuit (parallel reactor and caps are tuned relatively close to the dominant harmonic of the harmonic load (drive or similar). Usually eliminating the dominant harmonic is enough to relieve significant distortion.
Neil
RE: Harmonic filter
RE: Harmonic filter