DEVICE FOR IDENTIFYING IMAGES, COUNTING CRITICAL VOLTAGE SURGES OR DIPS AND ESTIMATING TOTAL TIME OF ELECTRICAL EQUIPMENT FAILURE Russian patent published in 2002 - IPC

FIELD: data measuring and computing engineering. SUBSTANCE: device designed for detecting and counting voltage surges or dips lasting than permissible for preset critical levels and also total outage time of electrical equipment at transient voltage in supply mains has ac-to-dc converter, subtraction unit, reference voltage source, inverter, selector switch, n analog comparators (where n is number of analysis levels of voltage surge or dip modules), first and second digital comparators, first, second, third, and fourth counters, first and second digital memory units, square-pulse generator, level distributor, unitary-to-binary code converter, SR flip-flop, D flip- flop, first and second AND gates, first and second NAND gates, and OR gate. EFFECT: enlarged functional capabilities. 4 cl, 8 dwg, 1 tbl