Abstract：Converter transformer plays a critical role in the high voltage direct current (HVDC) transmission system. The reliability of the valve side busing is directly related to the safe and stable operation of the power system. As the main insulation of valve side bushing, oil-paper insulation is influenced by AC/DC composite electric field and polarity reversal, meanwhile, it is easy to degrade with the coupling of electric field, heat field and mechanical stress so as to accumulate the space charge. In addition, the interface charge will accumulate seriously by reason of the mismatch between the dielectric parameters and the conductance parameters of oil-paper insulation, which will cause flashover or breakdown. Hence, it is the serious issue that the development of oil-paper insulation structure of converter transformer faces. In this paper, the research progress of the oil-paper insulation of converter transformer is discussed. The charge behavior and the characteristics of partial discharge or breakdown of the oil-paper insulation under different circumstance are analyzed. The influence of electric field, temperature, water and aging degree are discussed. In the meantime, the modification of transformer oil and insulating paper are also discussed, of which advantages and disadvantages are summarized. Moreover, the development trend of modification of oil-paper insulation structure for valve side bushing of converter transformer is prospected. The summary of these research results has the capacity to provide reference for the development of oil-paper insulation in the future.
杜伯学, 朱闻博, 李进, 姜金鹏. 换流变压器阀侧套管油纸绝缘研究现状[J]. 电工技术学报, 2019, 34(6): 1300-1309.
Du Boxue, Zhu Wenbo, Li Jin, Jiang Jinpeng. Research Status of Oil-Paper Insulation for Valve Side Bushing of Converter Transformer. Transactions of China Electrotechnical Society, 2019, 34(6): 1300-1309.
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2019, Vol. 34 
