金属钝化剂BTA对变压器硫腐蚀的抑制效果及绝缘油性能的影响研究

油中的腐蚀性硫化物会侵蚀变压器绝缘绕组,导致油纸绝缘性能下降,给变压器的运行带来安全隐患,工程上常通过加入金属钝化剂来抑制腐蚀性硫化物与铜离子的结合,进而延缓硫腐蚀过程的发生。研究了油中常用金属钝化剂苯并三氮唑(BTA)对铜硫化物形成的抑制效果,并研究了钝化剂在长期运行过程中对变压器绝缘油性能的影响。结果表明,在含有腐蚀性硫的绝缘油中加入BTA可以有效缓解变压器硫腐蚀,但高浓度的BTA会促使油中铜离子含量增加,而油中铜离子能通过传递分解过氧化氢产生过氧化自由基,加速油品劣化,导致油纸绝缘老化加速。

Effect of metal passivating agent BTA on transformer sulfur corrosion inhibition and insulating oil performance

Recently, several transformer failures happened due to the corrosive sulfur in insulation oil. Corrosive sulfur in oil can attack insulation winding, leading to the decrease of oil-paper insulation characteristic, the decrease of which brings potential safety hazard to the operation of transformer. Adding the metal passivator into the insulating oil is widely used to suppress the formation of copper sulfide in oil-immersed transformer, which can delay the combination between corrosive sulfur and copper ions. This paper deeply studies the suppression effect of metal passivator benzene (BTA) on the formation of copper sulfide, and the effect of BTA on the properties of insulating oil. The results show that high concentrations of benzotriazole (BTA) showed a good anti-corrosion effect when the oil contained different amounts of the metal deactivator. However, the content of copper ions dissolved in the oil would increase on the contrary. Therefore, the content of BTA added into the insulation oil should be controlled.