Calibration Technique of AC Voltage of a Resonant Test Device

In the energy sector, there are many objects with a large capacity. The capacitance of such objects is in the range from 10 to 200 nF. For such objects, tests should be carried out with a rated test voltage of an industrial frequency of 50 Hz. There are a number of regulatory parameters for testing with AC power frequency. The main regulatory parameter is the permissible error. The permissible error is set no more than 3%. The authors of the article have developed a method for calibrating the test AC voltage at industrial frequency. In this technique, the main reduced measurement error of the test does not exceed ± 3 %. The authors have proposed a technical solution for measuring the rms values of the test voltage, calculated and investigated linear, exponential and power functions. These functions describe the relationship between the experimental data of removing the quantization levels from the analog-to-digital converter of the micro controller from the applied test voltage on the reference kilovolt meter. The most optimal function was calculated and selected. The authors have created a prototype. This sample allows you to measure the rms values of the test voltage within the reduced error of not more than 2.87%. The application of the developed calibration technique with the basic reduced error within the specified limits opens up a number of possibilities. This will make it possible to create a number of digital measuring kilovoltmeters that can measure alternating voltages in the range from 1 kV to 20 kV.