Study of Frequency Characteristics of a Voltage Sensor Based on System of Galvanically Coupled Bodies

Measuring voltage in electrical networks is an important task in ensuring its stable and uninterrupted operation. The design of a high-voltage measuring system of industrial frequency based on a system of galvanically coupled bodies is proposed. A mathematical model of a sensor with a matching device, including an instrumentation amplifier and an integrator, is described. The results of the conducted analysis of the frequency characteristics of the elements of the matching device are presented. The harmonic composition of the voltage at the output of each of the elements that make up the measurement system was measured and compared with the reference values. During the experiment, the adequacy of the mathematical model, as well as the correctness of the selection of elements, was confirmed. The results showed that the developed voltage sensor based on a system of galvanically coupled bodies with a matching unit meets the permissible requirements for the accuracy of high voltage measurement at least up to the 9th harmonic.