Contactless wide-band high-current ferromagnetic converters for monitoring and control systems in the electric power industry

Abstract

The paper shows the importance of contactless conversion and measurement of large direct currents using non-destructive magnetic modulation contactless ferromagnetic converters in the electric power industry. The results of their constructive development are presented. The developed converter differs from the known ones. It has increased accuracy and sensitivity, technological design and small weight and dimensions. The issues of sensitivity of magnetic modulation contactless converters are considered. The expression of the optimal static characteristic of the developed magnetic modulation contactless converter is determined and analyzed. Its maximum deviation from the calculated one does not exceed 6%. Expressions for the current, average sensitivity and sensitivity in terms of the magnitude of the excitation of a magnetic modulation contactless converter are obtained and investigated. At the same time, the maximum sensitivity of the converter reaches a value of 0.425 with an optimal excitation value of 1.65. It is recommended to take the permissible limit of the input value of the converter less than one. Its input value must be taken equal to 0.7. Then the current sensitivity of the converter is 0.47. The developed magnetic modulation contactless converter has increased sensitivity due to the use of longitudinal modulation. Due to its original design, it has low weight and size parameters. It can be widely used in monitoring and control systems in land reclamation and irrigation, in water supply, industry, metallurgy, railway transport, in science, technology, GIS technology, and, in particular, in digital coatings and database visualization, as well as for checking electric meters at the place of their installation for contactless monitoring of direct and alternating currents.