Patent ID: 6636405
Filing Date: 2003-10-21
Classification: H02J,Y02E

Abstract:
In a multiple phase electrical distribution system for supplying power from an AC source to one or more nonlinear loads connected to at least one phase line therein, a device for substantially eliminating currents in a neutral wire, said device comprising:a completely-passive parallel resonant circuit having three passive electrical branches connected in parallel; said first completely-passive parallel resonant circuit having an almost infinite impendence at a third harmonic frequency of a fundamental frequency of said AC source to prevent the formation of only said third harmonic frequency and no other frequency so that there is no third harmonic frequency to remove or dissipate as heat; said three passive electrical branches comprise a first branch consisting of a capacitor, a second branch consisting of a reactor, and a third branch consisting of a resistor; and said completely-passive parallel resonant circuit being electrically connected to said neutral wire, whereby said device is bi-directional in that said system is free of said third harmonic frequency both toward said nonlinear loads and back to said AC source.