TW353242B - Power protective device - Google Patents

Abstract

A power protective device mainly comprising a CPU connection judgment circuit 10, a detection control circuit 20 and a protective circuit 30, in which: each corresponding contact of the CPU connects with each circuit for performing a signal determination and sending out a signal to each system for performing an appropriate corresponding operation; the judgment circuit mainly comprising plural sets of diodes, transistors, capacitances, resistances and coil relays, capable of performing an initial judgment on the wiring of an electric meter and determining that which line is grounded among the wirings into a building; the detection control circuit comprising plural sets of continuous determination set consisting of induction coils and diodes, resistances, capacitances and photo couplers, capable of continuously determining the consecutive wiring current and outputting an appropriate responsive operation; the protective circuit comprising diodes and resistances and capable of sending out a signal corresponding to the passage of a high voltage thereby enabling the CPU to close the power in order to ensure the operation of the protective system.