周 湶饶俊星,陈 瑶蒲亚运王时征解慧力（. 输配电装备及系统安全与新技术国家重点实验室（重庆大学） 重庆 40004 . 国网自贡供电公司 自贡 64000 . 重庆大学材料科学与工程学院 重庆 400044）



缓蚀剂BTA对变压器热老化油硫腐蚀的影响

周 湶1饶俊星1,2陈 瑶2蒲亚运3王时征1解慧力1
（1. 输配电装备及系统安全与新技术国家重点实验室（重庆大学） 重庆 400034 2. 国网自贡供电公司 自贡 643000 3. 重庆大学材料科学与工程学院 重庆 400044）

摘要为研究缓蚀剂BTA对变压器油硫腐蚀的影响，于实验室内通过腐蚀性硫和BTA的添加对新变压器油进行加速热老化分析。通过肉眼观察、扫描电镜和能量色散X射线光谱分析（简称能谱分析）等手段研究加速热老化试验中铜绕组和绝缘纸表面状态、微观结构及元素组成。利用绝缘油介电强度自动测试仪和绝缘油介损及电阻率测试仪测量了热老化试验后变压器油击穿电压、介损和体积电阻率等的变化情况。采用三电极体系对试验铜绕组进行电化学分析。结果表明：铜绕组表面状态的变化可初步表征受硫腐蚀的程度；添加BTA可以抑制油硫腐蚀，保护铜绕组，减缓油品老化；BTA不仅可以作用于新铜绕组，而且对已被腐蚀过的铜绕组也有缓蚀效果；BTA可以提高绕组线性极化电阻，降低自腐蚀电流，从而提高其耐腐蚀性能。

关键词：变压器 油纸绝缘 铜绕组 腐蚀性硫 缓蚀剂BTA 热老化

国家自然科学基金（51277187）和国家创新研究群体基金（51021005）资助项目。

The Influence of Corrosion Inhibitor BTA on Sulfur Attack of Transformer Oil

Zhou Quan1Rao Junxing1,2Chen Yao2Pu Yayun3Wang Shizheng1Xie Huili1
（1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology College of Electrical Engineering Chongqing University Chongqing 400044 China 2. Zigong Power Supply Corporation Zigong 643000 China 3. School of Materials Science and Engineering Chongqing University Chongqing 400044 China）

Abstract To study the influence of corrosion inhibitor BTA on sulfur corrosion of transformer oil, a series of accelerated thermal aging tests was carried out by adding corrosive sulfur and BTA to new transformer oil in the laboratory. The surface state, microstructure and element components of copper winding and insulation paper were analyzed by macroscopic observation, scanning electron microscope (SEM) and energy-dispersive x-ray spectroscopy(EDX) analyzer. Meanwhile, the breakdown voltage, dielectric loss and volume resistivity of transformer oil after thermal aging tests were measured by insulating oil dielectric strength automatic tester and insulating oil dielectric loss/resistivity tester. Electrochemical analysis of copper windings was analyzed by three-electrode electrochemical system. The results show that the surface state of copper windings represents its corrosive level Adding BTA can inhibit oil sulfur corrosion, protect copper windings, and slow down the oil aging. BTA can not only act on both new copper winding and the corroded copper windings,but also increase the winding linear polarization resistance and decrease corrosion current.

Keywords：Transformer, oil-paper insulation, copper winding, dibenzyl disulfide, inhibitor BTA, thermal aging

0 引言

电力变压器是输配电过程中的能量转换核心，而油纸绝缘系统在电力变压器内绝缘中扮演着非常重要的角色。……