Abstract
Critical components for HVDC transmission systems are polymer insulators, which have stricter requirements that are more difficult to achieve compared to those of HVAC insulators. In this study, we investigated the optimal design of HVDC polymer insulators by using a DC electric field analysis and experiments. The physical properties of the polymer specimens were analyzed to develop an optimal HVDC polymer material, and four polymer specimens were prepared for DC breakdown experiments. Single and reverse polarity breakdown tests were conducted to analyze the effect of temperature on the breakdown strength of the polymer. In addition, electric fields were analyzed via simulations, in which a small-scale polymer insulator model was applied to prevent dielectric breakdown due to electric field concentration, with four DC operating conditions taken into consideration. The experimental results show that the electrical breakdown strength and the electric field distribution exhibit significant differences in relation to different DC polarity transition procedures.
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Han, BJ., Seo, IJ., Seong, JK. et al. DC breakdown characteristics of silicone polymer composites for HVDC insulator applications. Journal of the Korean Physical Society 67, 1783–1791 (2015). https://doi.org/10.3938/jkps.67.1783
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DOI: https://doi.org/10.3938/jkps.67.1783