ДОСЛІДЖЕННЯ ДЕРЖАВНОГО ПЕРВИННОГО ЕТАЛОНУ ОДИНИЦІ СИЛИ ЗМІННОГО СТРУМУ

Abstract

The article is devoted to the results of the research in order to solve the problem of metrological support of production and operation of thermoelectric power converters, precision meters and AC power sources in the branches of the national economy. The optimal solution to the problem of metrological support is to create a national standard unit of alternating current. The article conducts theoretical research, comparison with foreign analogues and analysis of methods for measuring and reproducing the strength of alternating current. The analysis of the precision means intended for measurement, reproduction and comparison of force and voltage of alternating current is carried out. Theoretical bases of creation of a high-precision standard of unit of alternating current are outlined. To build a national standard, the method of comparing the AC current with the equivalent DC current using a precision thermoelectric converter and shunts was chosen. The composition and requirements to the operating conditions of the national standard are determined. Since the storage and reproduction of a unit of alternating current must be realized by comparison with the equivalent direct current, the main source of uncertainty of measurements of this unit is a combination of uncertainties of measurements of thermoelectric comparator Fluke 792A, precision shunts A40, which are part of the standard, output voltage meters measure the electrical resistance to direct current and the output signal of the thermocomparator. According to the results of research work, for the first time in Ukraine the national standard of an alternating current unit was put into operation.