变压器油中存在腐蚀性硫和铜离子会严重威胁变压器的安全稳定运行.针对腐蚀性硫和铜离子综合治理这一技术难题,采用吸附法对变压器油进行脱除处理.结果表明:经过84 h吸附处理,油中铜离子含量从1.2 mg/kg降至0.2 mg/kg,介质损耗因数从1.57%降至0.057%,体积电阻率从3.6 × 1010Ω·m升至1.96 × 1012Ω·m,总硫含量从550.1 mg/kg降至380.8 mg/kg,腐蚀性硫含量从51.6 mg/L降至18.1 mg/L.绕组绝缘电阻提高约3倍,吸收比恢复正常.处理过程对抗氧剂T501含量、水分、酸值、界面张力和击穿电压没有不良影响.
Corrosive sulfur and copper ion often exist in transformer oils. It is extremely dangerous to the safety and stability operation of transformers. In view of this technical problem, we used an effective adsorbent to remove the corrosive sulfur and copper ion. The results show that after adsorption treatment for 84 h, the copper ion decreases from 1.2 mg/kg to 0.2 mg/kg, the dielectric loss factor decreases from 1.57% to 0.057%, the volume resistivity increases from 3.6 × 1010Ω·m to 1.96 × 1011Ω·m, the total sulfur decreases from 550.1 mg/kg to 380.8 mg/kg, and the corrosive sulfur decreases from 51.6 mg/L to 18.1 mg/L. The insulation resistance of transformer winding increases about three times, and the absorp-tion ratio return to normal. Moreover, the treatment process has no harmful effect to the antioxidant T501 content, water, interfacial tension acid value, and breakdown voltage.
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