Experimental Study of a High-Voltage Pulse Generator
DOI:
https://doi.org/10.24160/0013-5380-2026-3-68-75Keywords:
high-voltage pulse generator, cascade frequency converter, unipolar pulse, bipolar pulseAbstract
The article addresses a study of a pilot high-voltage pulse generator (HVPG) constructed on the basis of a cascade frequency converter. The device, its components, and technical characteristics are described. An individual algorithm for jointly switching the HVPG power cells has been developed. In accordance with the newly developed algorithm, the output voltage pulse front produced by an individual cell does not depend on the discharge loop parameters, but is only determined by the IGBT module switching capabilities and the cell voltage pulses synchronization error. The output voltage pulse waveforms are given. It is shown that the minimum duration of the voltage pulse front in the proposed HVPG is determined by the switching time response of the switches used. An analysis of the waveforms has shown that the coil insulation can be approximated with sufficient accuracy by a second order dynamic element. By using the developed HVPG, it is possible to perform both insulation lifetime tests (long-term switching on with fixed voltage parameters) and maximum voltage tests until complete or partial insulation breakdown (by single pulses of the required polarity). A number of tests have been carried out on the pilot HVPG, including a no-load test, a test with an RC load, an air gap breakdown test, and a test on an electric motor winding.
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