硫腐蚀反应定量表征方法及其对绝缘纸老化的影响机制

发布时间：2018-01-16 21:22

本文关键词：硫腐蚀反应定量表征方法及其对绝缘纸老化的影响机制　出处：《中国电机工程学报》2015年11期 　论文类型：期刊论文

【摘要】：为研究硫腐蚀反应的定量表征方法及其对绝缘纸老化的影响机制,对运行6年的腐蚀性尼纳斯油样开展了加速老化实验,并与普通25#变压器新油进行比对。对老化过程中变压器油样总硫浓度、油样质量测试后发现,油中硫元素的绝对含量随老化时间延长呈增大趋势,说明绝缘纸裂解使硫成分进入油中,造成总硫浓度升高。通过引入绝缘纸聚合度(degree of polymerization,DP)、总硫浓度和油样质量三个特征参量,建立了定量表征硫腐蚀程度的新判据。对老化过程中内、外层纸的含水量、酸值和聚合度进行比较分析,结果表明:在一定氧气含量环境下,因硫腐蚀反应的影响,老化初期内层纸的含水量小于外层纸,但随着老化时间增加,二者差距逐渐减小,到老化后期,内层纸水含量反超外层纸;0~24 h内,外层纸酸值略大于内层纸,24~72 h内,内层纸酸值迅速增长,明显大于外层纸;内层纸聚合度大于外层纸聚合度,而随着老化时间增加,内、外层纸的聚合度差距越来越小。
[Abstract]:In order to study the quantitative characterization method of sulfur corrosion reaction and its influence mechanism on the aging of insulator paper, accelerated aging experiments were carried out on corrosive Nunas oil samples running for 6 years. Compared with the new oil of 25# transformer, it is found that the absolute content of sulfur in the oil increases with the aging time after testing the total sulfur concentration of the oil sample and the quality of the oil sample during the aging process. It is shown that the decomposition of insulator paper causes sulfur to enter into the oil, which results in the increase of total sulfur concentration, and the degree of polymerization of insulating paper DP2 is introduced by introducing the degree of polymerization of insulator paper. Three characteristic parameters, total sulfur concentration and oil sample quality, were established to quantitatively characterize the corrosion degree of sulfur. The moisture content, acid value and polymerization degree of outer paper during aging were compared and analyzed. The results showed that the moisture content of the inner paper was smaller than that of the outer paper at the early aging stage due to the influence of sulfur corrosion reaction in a certain oxygen content environment, but with the aging time increasing, the gap between the two gradually decreased and reached the later stage of aging. The water content of inner layer paper is opposite to that of outer layer paper; Within 24 h, the acid value of outer layer paper was slightly higher than that of inner layer paper (2472 h), and the acid value of inner layer paper increased rapidly, which was obviously larger than that of outer layer paper. The degree of polymerization of inner paper is greater than that of outer paper, but with the aging time increasing, the difference of polymerization degree of outer paper becomes smaller and smaller.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);福建省电力科学研究院;
【基金】：北京市自然科学基金项目(31420181)~~
【分类号】：TM41
【正文快照】： 0引言油纸复合绝缘性能是影响油浸式电力变压器运行安全的关键因素。油中腐蚀性硫与铜片反应可生成铜的硫化物而附着在绝缘纸表面,导致绝缘纸电气性能下降,危害绝缘安全。近十几年来,国内外发生了多起由腐蚀性硫引发的绝缘故障,并引起极大关注[1-2]。目前评价变压器油硫腐蚀

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