Abstract
When developing a source for smooth regulation of the voltage supplied to the primary circuit of the resonant circuit of a high-potential test transformer, the task is to protect the source from abnormal operating modes and to continuously measure the current, as well as to research and develop a protection circuit for an adjustable AC voltage source with continuous measurement of the output current load not exceeding ± 5%. In solving the problem, the authors proposed to develop and investigate current sensors of world manufacturers of semiconductor devices and, on their basis, for the purpose of import substitution, develop a current sensor that can meet or even exceed similar devices in terms of technical characteristics. In the course of the study, a current sensor of the DT-RS-1.0A type was developed, which makes it possible to measure the output current of an adjustable AC voltage source within the average value of the main reduced error of 1.26%. The use of the developed solution for measuring the output current of an adjustable AC voltage source for the purpose of continuous monitoring and protection against exceeding the specified settings will allow creating on its basis a number of digital measuring ammeters that allow measuring and controlling alternating current in the range from 1 mA to 1000 mA.
Keywords
adjustable AC voltage source, pulse-width modulation, insulation test, overvoltage, high-voltage test setup, test object, resonance.
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