| 摘要 |
PURPOSE: A panel board with a zero-phase harmonic filter is provided to have a zero-phase harmonic filter which attenuates excessive zero-phase harmonic waves generated in a neutral conductor of a three phase and four wire distributing system. CONSTITUTION: A panel board with a zero-phase harmonic filter includes an open phase and a negative phase sensing unit(110), a zero-phase harmonic wave attenuating unit(120), a switching unit(130), a temperature detecting unit(140), a current sensor(150), a main control unit(160), a display unit(170), and an alarm generating unit(180). The zero-phase harmonic filter includes a switching unit and the zero-phase harmonic wave attenuating unit. The zero-phase harmonic wave attenuating unit attenuates a zero-phase harmonic wave inserted into a neutral conductor of a three phase and four wire panel board using a zigzag wire connecting transformer. A temperature detecting unit detects the temperature of the zigzag wire connecting transformer. |
