Abstract
A novel 3-element mixed insulation oil was developed successfully by our team. Its key parameters meet the requirements of IEC 60296:2012. Taking mineral oil-impregnated insulation pressboard as control group, the lightning impulse breakdown voltages of the novel 3-element mixed oil-impregnated insulation pressboard with different thickness were measured by the rising-voltage method. Besides, the partial discharge properties of the novel 3-element mixed oil-pressboard insulation system were also studied under needle-plane electrode configuration. Some key parameters, such as PRPD patterns, maximum pulse amplitude and repetition rate were comparatively analysed between two types of oil-pressboard insulation system. The results show that the discharge properties of the mixed oil-pressboard insulation system are comparatively desirable. There is not significant difference on dielectric strength under lightning impulse voltage between two types of oil-pressboard insulation system. Compared with mineral oil-pressboard insulation, the mixed oil-pressboard insulation system has lower partial discharge inception voltage, higher discharge pulse amplitude and repetition rate in corona discharge, which means it’s relatively more prone to partial discharge under severe non-uniform electrical field for the novel 3-element mixed oil-pressboard insulation system.
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Acknowledgement
The authors thank the project supported by Science and Technology Project of the State Grid Corporation of China (Research on key technology for mixed insulation oil transformer).
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Chen, X., Hao, J., Liu, X., Yang, Y., Feng, D., Liao, R. (2020). Researches on the Discharge Characteristics of the Novel 3-Element Mixed Oil-Pressboard Insulation System Under Severe Non-uniform Electrical Field. In: Németh, B. (eds) Proceedings of the 21st International Symposium on High Voltage Engineering. ISH 2019. Lecture Notes in Electrical Engineering, vol 599. Springer, Cham. https://doi.org/10.1007/978-3-030-31680-8_28
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DOI: https://doi.org/10.1007/978-3-030-31680-8_28
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