DEVICE FOR ELECTRIC ENERGY QUALITY CONTROL Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: device setter 1 of measurement moments, converter 2 of instantaneous voltage values into a digital code, setter 3 of voltage ratings, control unit 4, units 5 and 6 of extraction of minimum and maximum codes, correspondingly first squarer 7, second squarer 8, second arithmetic unit 9, first arithmetic unit 10, totalizing meter 11, unit 12 of finding a square root of a number, ratiometer 13 and display unit 14. Second arithmetic unit 9 has five elements: delay element of code recording, unit of minimum code neutralization and unit of maximum code neutralization made identically; each of them has series connected unit of AND elements, code summator, unit of AND elements and unit of dividing the code sum into the number of measurements. The arithmetic unit also has a flip-flop, unit of choosing the measurement mode, pulse counter, AND element, counter of the measurement number, three units of AND elements and unit of code subtracting. EFFECT: enhanced accuracy of measurements. 2 dwg