The Research on Method for Reduction of the Neutral Conductor Current in the Three-Phase Four-Wire Low-Voltage Distribution Line

Abstract

In low-voltage distribution line of the three-phase four-wire system, the neutral conductor current increases by the current mainly on third harmonic wave which does not have the phase rotation under the condition in which a balance of the load was removed, when the harmonic generation equipment is contained for the load. The increase of such neutral conductor current is made to increase the waveform distortion of receiving end voltage, and various waveform interferences are arising. In order to reduce the neutral conductor current, the method for inserting the active filter for third harmonic wave near the load is proposed, and the protective effect of waveform interference is also reported.In this paper, the method for drastically reducing the neutral conductor current by the method using resonance phenomena of the LC which is simpler than active filter is proposed.