Приближенный метод оценки коэффициента синусоидальности напряжения по показаниям вольтметров

Abstract

The simple method of evaluation of the deformation ratio of the strain harmonicity according to the working value of the deformed sinusoidal voltage and crest value of this strain (measured with the help of a voltmeter) is suggested. An analytical expression for calculation of the deformation ratio of harmonicity strain is obtained. Survey results of the systematic error of the calculation of the deformation ratio of the strain harmonicity with the use of the found expression are presented. The research is carried out with a numeric procedure in MathCad for two kinds of the deformed sinusoidal voltage with previously known harmonic composition and previously known value of the deformation ratio of the harmonicity strain. Survey results of the mentioned systematic errors are presented in the form of diagrams. According to the findings conclusions are drawn and limitations in the application of the suggested expression for the estimation of the deformation ratio of strain harmonicity as well as the requirements to metrological performance of the used voltmeters are formulated