Failure mechanism of transformer oil-immersed cellulosic insulation induced by sulfur corrosion
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ORIGINAL RESEARCH
Failure mechanism of transformer oil-immersed cellulosic insulation induced by sulfur corrosion S. Gao
. L. Yang . T. Ke
Received: 2 December 2019 / Accepted: 29 May 2020 Ó Springer Nature B.V. 2020
Abstract The life of transformer oil-paper insulation is determined by the insulation property of transformer cellulosic insulation. Existing studies have shown that sulfur corrosion poses a serious threat to the properties of transformer oil-immersed cellulosic insulation due to the reaction of corrosive sulfur dissolved in oil with copper winding. This paper investigated the effect of sulfur corrosion on the characteristics of transformer cellulosic insulation, cellulosic insulation winding samples with different degrees of sulfur corrosion were obtained through an accelerated thermal aging experiment. Then, short-/long-term withstand voltage tests for the cellulosic
insulation winding were conducted. Experimental results showed that the contamination of sulfur corrosion had a minimal effect on the power–frequency breakdown voltage of the cellulosic insulation winding but considerably decreased its long-term electrical life. Combined with the analysis of the electrical/physical and chemical parameters of oilimmersed cellulosic insulation, the failure mechanism of transformer oil-immersed cellulosic insulation induced by sulfur corrosion was synthetically discussed and analyzed.
S. Gao (&) Key Laboratory of Industrial Internet of Things and Networked Control, Ministry of Education, Chongqing University of Posts and Telecommunications, Chongqing, China e-mail: [email protected] L. Yang State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing, China T. Ke State Grid Chongqing Electric Power Company Chongqing, Chongqing, China
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Cellulose
Graphic abstract
Keywords Cellulosic insulation Sulfur corrosion Cellulosic insulation winding Electrical life Withstand voltage Failure mechanism
Introduction Oil-immersed power transformers play an important role in the electric power transmission and distribution systems (Arroyo et al. 2017; Jalbert et al. 2015; Wang et al. 2019). Copper conductor, which has the excellent conductivity and stable physicochemical properties, is widely used for current and voltage transmissions. Copper conductor covered with multilayer oil-immersed cellulosic insulating paper (cellulosic insulation winding) is widely used to achieve insulation, and the performance of oil-immersed cellulosic insulation is directly related to the operation life of transformer (Arroyo et al. 2015; Saha 2003). In recent years, many field examples and investigations have revealed that sulfur corrosion is widely considered a serious threat to the insulation performance of cellulosic insulation in the oil-immersed power transformer (Zhou et al. 2019; Atejkova et al. 2017). Working group A2-32 and A2-40 were respectively established by CIGRE in 2009 and 2012 to investigate
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