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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP1997076ApriorityCriticalpatent/JPS52103766A/en
Publication of JPS52103766ApublicationCriticalpatent/JPS52103766A/en
PURPOSE: To provide an electrostatic filtering apparatus, impurity substances are removed by impressing high voltage to the liquid to be filtered, wherein electric discharge caused in the apparatus is detected by voltage-change detecting section and thereupon power source is dosconnected, whereby trouble of catching fire can be prevented.