CHARGE PLATE MONITOR AND OPERATING METHOD THEREOF

Disclosed is a charge plate monitor for eliminating a stray capacitor in a relay switch by using a voltage feedback method, and an operation method thereof. The charge plate monitor includes: a measurement plate unit including a conductive plate, a ground surface, and an insulator provided between the conductive plate and the ground surface; a noncontact electrometer provided between the conductive plate and the ground surface of the measurement plate unit and detecting an electrical potential of the conductive plate; a measurement unit reading or passing the electrical potential of the conductive plate detected by the noncontact electrometer; and a voltage feedback circuit unit that feeds the electrical potential of the conductive plate passed by the measurement unit back, and applying the electrical potential to a terminal of a relay switch terminal.