INCREASING THE ACCURACY OF HIGH VOLTAGE CAPACITIVE DIVIDERS 

Aleksey I. Nefed'ev, Doctor of technical sciences, associate professor, professor of the sub-department of electrical engineering, Volgograd State Technical University (28 V.I. Lenin avenue, Volgograd, Russia), E-mail: iit@pnzgu.ru
Dmitriy I. Nefed'ev, Doctor of technical sciences, associate professor, professor of the sub-department of information and measurement technology and metrology, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: iit@pnzgu.ru 

Background. The object of the study is high-voltage capacitive dividers used in the verification (calibration) operations of high-voltage measuring instruments, as well as, if necessary, expanding the measurement limits of electrostatic voltmeters. The subject of the study is ways to improve the accuracy of high-voltage capacitive dividers with distributed parameters applied in the above areas. The aim of the work is to analyze two ways to increase accuracy, one of which is based on the application of new design solutions, and the other on the implementation of new theoretical provisions that ensure the possibility of increasing the accuracy of high–voltage capacitive dividers in a wide range of values. Materials and methods. The analysis of two ways to increase the accuracy of capacitive dividers of high voltage is carried out on the basis of the provisions of theoretical metrology, elements of mathematical statistics and mathematical modeling, as well as an experimental study of the methods proposed in the work to increase the accuracy of measurement. Results. Two methods have been developed to improve the accuracy characteristics of high-voltage em-bone dividers. The first method is based on the use of new design solutions to minimize the error of high-voltage capacitive dividers. The second method implements new theoretical provisions, the implementation of which makes it possible to significantly reduce the error of high-voltage capacitive dividers during operation. Conclusions. The proposed new design of the capacitor screens of the main (measuring) circuit of the high–voltage capacitive divider and the use of a combination of two independent methods – the method of independent verification (self-calibration), and the method of measuring the conversion coefficient of the divider using a transient air capacitor ensure high accuracy of measuring the conversion coefficients of high-voltage capacitive dividers. This will improve both the accuracy of commercial electricity metering and ensure decentralized reproduction and transmission of a relative value – the conversion coefficient of a high-voltage capacitive divider. 

high-voltage voltage divider, independent verification, air capacitor, conversion factor 

Nefed'ev A.I., Nefed'ev D.I. Increasing the accuracy of high voltage capacitive dividers. Izmereniya. Monitoring. Upravlenie. Kontrol' = Measurements. Monitoring. Management. Control. 2022;(2):39–45. (In Russ.). doi:10.21685/2307-5538-2022-2-5