The present invention relates to an electric precipitator using a secondary battery power source, receiving commercial power, charging the battery capacity required for generating a high voltage to collect electric dust in a secondary battery unit with a required charging voltage, and supplying it from the secondary battery unit. The high voltage is generated by supplying the high voltage to the high voltage generator, and when high voltage for electric dust collection occurs, the insulation switch is operated in advance to physically separate the commercial power supply and the secondary battery to at least twice the air insulation resistance. By forming an air insulating layer, it completely insulates between the commercial power supply unit and the high voltage generation unit. According to the present invention, when a high voltage for electric dust collection occurs in the high voltage generator of the electric precipitator, the insulation switch is operated in advance to form an air insulation layer with at least twice the air insulation resistance, thereby completely connecting the commercial power supply unit and the high voltage generation unit. Because it can be insulated properly, damage caused by electric shock or surge voltage caused by the commercial power of the electric precipitator frequently occurs due to the destruction of air insulation resistance when using a commercial power source as the main power source for the above high voltage generation. Insulation device consisting of insulating oil and insulating oil storage container used in conventional electric dust collectors is inconvenient to use because it is impossible to carry and install, and because of its large appearance, it can solve all the problems that cannot be used in a narrow space for special purposes for electric dust collection. have.
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