Research on Key Parameters of Long-term Induced Withstand Voltage and Partial Discharge Test for ±800 kV Converter Transformer in Lingzhou and Interference Elimination of Partial Discharge

During the tests of long-term induced withstand voltage on site and handover partial discharge for ± 800 kV UHV converter transformers in Lingzhou, in accordance with the requirements of the regulations and standards for the above tests, the differences between the two types of converter transformers with angle valve and star valve in the two tests were studied respectively. And the parameters of the configured test equipment were calculated and verified. Taking the converter transformer with star valve as an example, the paper elaborates in detail from the test principles, instruments used, parameter calculations and on-site tests, also summarizes the precautions of each link, verifies the applicability and generalization of the research, and provides methods for the interference elimination of the relevant partial discharge test in the electrification converter station with charged electrification.