Errors of electronic meters of electric energy

Abstract

Problem. The people’s demand for electricity has been growing year after year. This requires increasing the generation of electricity and reducing its losses on the way to a consumer. There is also a necessity to keep records of energy consumption. The main indicators characterizing the effectiveness of information and measuring technologies in the metering system are the accuracy of given measuring information and its reliability. The process of obtaining the information should be automated in order to provide the measuring information on time. In the electricity metering system, this is determined by the measuring principles and the quality of the metering system. Goal. Estimation of the errors of measuring transformers of different accuracy types, making recommendations on the choice of measuring transformers of different accuracy types and determining the ways to reduce any errors. Methodology. The methods of the theory of electromagnetic field and theoretical basis of electrical engineering have been used in the analysis and study of measuring transformer errors. The symbolic method of complex amplitudes and the methods of vector algebra have been applied to determine voltage errors and current errors. Results. The estimation of an error of measuring transformers of different accuracy types has been carried out. The recommendations on the choice of measuring transformers of different accuracy types have been made, and the main ways of reducing errors have been defined. Originality. The methods for estimating errors by current transformers and voltage transformers have been further developed. The methods of estimating errors in electric energy meters have been developed. The method of choosing current transformers has been improved taking into account various operational factors. Practical value. Any error of a current transformer depends on its loading capacity. The methods for reducing such errors have been defined. The factors that must be taken into account when applying the method of selecting current transformers aimed at reducing an error have been presented. The application of the given method of choosing current transformers will result in improvement of the measuring equipment value. This will increase the accuracy of the information being measured and allow reducing an error margin to a minimum value.Key words:current transformers; voltage transformers; electronic meters; meters of electrical energy; errors; measuring transformers.