• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Effects of electric fields on copper sulfide deposition and the properties of insulating oils in oil-immersed transformers
【24h】

Effects of electric fields on copper sulfide deposition and the properties of insulating oils in oil-immersed transformers

机译：电场对油浸式变压器中硫化铜沉积和绝缘油性能的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The failures of high-voltage transformers and reactors can result from the deposition of copper sulfide on the oil-impregnated paper insulation. This study explored the influence of electric fields on copper sulfide deposition and the properties of insulating oils as a result of the reaction of dibenzyl disulfide (DBDS) with copper in oil-immersed transformers. Accelerated aging experiments were conducted for pig-tail windings under two sets of conditions, namely, thermal aging only at 140 °C and AC/DC electrical and thermal aging at 5 kV/140 °C under low oxygen condition. This was combined with oil containing dibenzyl disulfide (DBDS) added to the non-corrosive oil to a concentration of 200 mg/kg. The corrosive sulfur deposits were examined by observing the surface morphology of the windings and measuring the copper and sulfur contents on the windings via inductively coupled plasma-atomic emission spectrometry and a precipitation method. The properties of the insulating oils were measured and analyzed at intervals. The results indicate that electric fields increased the amount of deposited copper sulfide on the windings. The higher the electric field strength, the higher the amount of deposited copper sulfide on the insulating paper surface. Subjecting the oil-paper insulation to electric field and elevated temperature generates dissolved copper in the insulating oil. The electric field can promote the dissolution of copper in oil. The ageing oil under thermal and electrical stresses promote copper dissolution and increase corrosion rate.
机译：高压变压器和电抗器的故障可能是由于硫化铜在油浸绝缘纸上的沉积所致。本研究探讨了油浸式变压器中二苄基二硫化物（DBDS）与铜反应的结果，电场对硫化铜沉积和绝缘油性能的影响。在两组条件下对尾纤绕组进行了加速老化实验，即仅在140°C下进行热老化，在低氧条件下在5 kV / 140°C下进行AC / DC电气和热老化。将其与添加到非腐蚀性油中的浓度为200 mg / kg的含二苄基二硫化物（DBDS）的油合并。通过观察绕组的表面形态，并通过电感耦合等离子体原子发射光谱法和沉淀法测量绕组上的铜和硫含量，检查了腐蚀性的硫沉积物。定期测量和分析绝缘油的性能。结果表明，电场增加了绕组上硫化铜的沉积量。电场强度越高，在绝缘纸表面上沉积的硫化铜量越高。使油纸绝缘层受到电场和高温的影响，会在绝缘油中生成溶解的铜。电场可以促进铜在油中的溶解。在热和电应力下老化的油促进铜溶解并提高腐蚀速率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号