Failure mechanism of transformer oil-immersed cellulosic insulation induced by sulfur corrosion
Failure mechanism of transformer oil-immersed cellulosic insulation induced by sulfur corrosion
复制标题
变压器油浸式纤维素绝缘硫腐蚀失效机理
DOI：
10.1007/s10570-020-03271-x
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发表时间：
2020-06
期刊：
影响因子：
5.7
通讯作者：
Ke Tingjing
中科院分区：
文献类型：
--
作者：
Gao Sihang;Yang Lijun;Ke Tingjing
Transformer油纸绝缘的寿命取决于Transformer纤维素绝缘的绝缘性能。现有研究表明，由于溶解在油中的腐蚀性硫与铜绕组发生反应，硫腐蚀对Transformer油浸纤维素绝缘的性能构成严重威胁。研究了硫腐蚀对Transformer纤维素绝缘特性的影响，通过加速热老化实验获得了不同硫腐蚀程度的纤维素绝缘绕组试样。然后，进行纤维素绝缘绕组的短期/长期耐受电压测试。实验结果表明，硫腐蚀的污染对纤维素绝缘绕组的工频击穿电压的影响很小，但大大降低了其长期电寿命。结合对油浸纤维素绝缘的电气、物理和化学参数的分析，对Transformer油浸纤维素绝缘硫腐蚀失效机理进行了综合探讨和分析。
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.
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