| 摘要 |
FIELD: data measuring and computer engineering. SUBSTANCE: device designed to identify and count voltage surges or dips lasting longer than permitted for preset critical levels and also to determine total outage time of electrical equipment at transient voltage of supply mains has ac-to-dc converter, subtraction unit, reference-voltage source, inverter, selector switch, n comparators, where n is number of voltage surge or dip amplitude modulus analysis levels, n variable-ratio frequency dividers, n frequency division ratio code setting elements, n + 2 pulse counters, n D flip-flops, one-shot multivibrator, AND gate, two OR gates, SR flip-flop, and square-pulse generator. EFFECT: simplified design, facilitates servicing, enlarged functional capabilities. 3 cl, 6 dwg |
