Patent ID: 8755205

Claim:
A leakage current reduction apparatus comprising a voltage detector, a voltage amplifier and a voltage applicator, said leakage current reduction apparatus being inserted between a first electrical device and a second electrical device by way of three-phase three-wire connecting lines, wherein said voltage detector has a winding for leakage current detection and main windings connected individually to the three-phase three-wire connecting lines, and detects a leakage current flowing the three-phase three-wire connecting lines through the main windings by detecting a voltage of the winding for leakage current detection as a detected voltage; said voltage amplifier amplifies said detected voltage and outputs an amplified voltage as an output voltage; and said voltage applicator has a winding for voltage application and main windings connected individually to the three-phase three-wire connecting lines, and generates an application voltage in the three-phase three-wire connecting lines through the main windings wherein the main windings of said voltage detector and the main windings of said voltage applicator are connected respectively in series and are inserted between said first electrical device and said second electrical device by way of the three-phase three-wire connecting lines, and wherein said voltage applicator generates the application voltage by applying the output voltage of said voltage amplifier to the winding for voltage application, and a polarity of said application voltage is the same as that of said detected voltage.