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首页> 外文期刊>Electric Power Applications, IET >Influence of the antioxidant on the long-term ageing characteristics of oil–paper insulation and the deposition and migration of copper sulphide in oil-immersed transformers
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Influence of the antioxidant on the long-term ageing characteristics of oil–paper insulation and the deposition and migration of copper sulphide in oil-immersed transformers

机译：抗氧化剂对油纸绝缘体长期老化特性的影响以及硫化铜在油浸变压器中的沉积和迁移

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摘要

This paper investigated the influence of 2, 6-di-tert-butyl-p-cresol (DBPC) on the long-term ageing characteristics of oil-paper insulation and the deposition and migration of copper sulphide induced by the reaction of copper and dibenzyl disulphide (DBDS) in oil-immersed transformers. A thermal ageing experiment at 130°C were designed and conducted by adding different concentrations of DBPC to the naphthenic mineral oil and after the experiments a set of characteristic parameters were tested. The result indicates that the excessive concentration (≥0.6%) of DBPC will slightly increase the ageing of insulating oil and increase the carboxyl group in the mineral oil, affecting the reaction of DBDS and copper, and the insulating paper wrapped on the copper strip was also aged seriously accordingly. Meanwhile, the deposition of copper sulphide on the insulating paper is found to be slightly increased with the increase of the concentration of DBPC. When insulating oil contains DBPC and DBDS, due to migration of DBDS-Cu and DBPC-Cu in oil, the copper ions in the oil would be fluctuating at a certain period of time. Although the addition of a small concentration of DBPC can improve the antioxygenic property of the insulting oil to some extent, the transformers that contain excessive concentration of DBPC may be more harmful than beneficial.
机译：本文研究了2，6-二叔丁基对甲酚（DBPC）对油纸绝缘材料的长期老化特性以及铜与二苄基反应引起的硫化铜沉积和迁移的影响油浸式变压器中的二硫化物（DBDS）。通过在环烷矿物油中添加不同浓度的DBPC，设计并进行了130°C的热老化实验，并在实验后测试了一组特征参数。结果表明，DBPC浓度过高（≥0.6％）会稍微增加绝缘油的老化程度，增加矿物油中的羧基，影响DBDS与铜的反应，包裹在铜带上的绝缘纸也相应地严重老化。同时，发现硫化铜在绝缘纸上的沉积随DBPC浓度的增加而略有增加。当绝缘油中含有DBPC和DBDS时，由于DBDS-Cu和DBPC-Cu在油中的迁移，油中的铜离子会在一定时间段内波动。尽管添加少量DBPC可以在某种程度上改善绝缘油的抗氧性能，但是包含过量DBPC的变压器可能有害无益。

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