FIELD: electrical engineering. SUBSTANCE: identifier used to simultaneously detect and meter voltage surges and dips whose duration is in excess of desired critical values and to determine total idle time of electrical equipment at transient voltage across supply mains as well as at heavy voltage fluctuations has ac-to-dc voltage converter, input terminal, subtraction unit, reference-voltage source, null device, modulus generator, analog comparator, analog-to- digital converter, first and second digital comparators, first through sixth counters, first and second digital memory units, D flip-flop, SR flip-flop, one-shot multivibrator, first through fifth AND gates, first and second NAND gates, square-pulse generator, level distributor, and OR gate. EFFECT: enlarged functional capabilities. 5 cl, 9 dwg
