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Research on power frequency superimposed impulse voltage generator

Transient voltage measurement is not only the design basis of insulation coordination of power equipment, but also related to the safe and stable operation of power grid. The transient voltage waveform in the actual power system is often the superposition of overvoltage and power frequency voltage. In order to measure this kind of superposition waveform, it is necessary to develop the high voltage test equipment which can produce the superposition waveform. Therefore, based on the circuit theory, this paper puts forward a parallel superposition circuit, respectively carries out mathematical analysis and simulation verification of the circuit principle, and determines the specific structure and key parameters of the circuit. On this basis, a set of high-voltage test equipment is set up by designing and purchasing high-voltage components and the overall control system of the equipment. The voltage waveform is observed by using voltage divider and oscilloscope. The test results show that the superposed voltage generator can superpose 500 kV positive or negative impulse voltage at any phase of 120 kV AC voltage.