变压器用植物绝缘油的低温特性试验研究 

王珊珊，周竹君，梁嗣元 
国网电力科学研究院武汉南瑞有限责任公司，湖北 武汉 430074 
 

摘 要：为研究凝点低的植物绝缘油对变压器绝缘强度的影响，用绝缘油耐压测试仪对凝固状态下的植物油、油纸绝缘结构进行耐压试验，并在高低温交变试验室对-30 ℃下的10 kV/315 kVA冷冻变压器实物进行耐压及局部放电试验。通过对比试验结果表明，对于大豆绝缘油，凝固后的绝缘油耐压下降了3.2 kV；油纸混合结构的耐压水平基本没变，凝固状态下的耐压值提高了1 kV；完全冷冻后的植物油变压器顺利通过耐压试验，且在最低气温为-27 ℃的内蒙古赤峰挂网运行23个月，运行情况良好。
关键词：植物绝缘油；变压器；低温特性；凝固
中图分类号：TM855 文献标识码：A 文章编号：1007-3175(2014)12-0048-03

Test Study on Low Temperature Characteristics of Transformer Vegetable Insulating Oil 

WANG Shan-shan, ZHOU Zhu-jun, LIANG Si-yuan 
Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute, Wuhan 430074, China 
 

Abstract:To study the influence on transformer insulation strength in vegetable oil of low solidifying point, the insulating oil pressure tester was used to carry out pressure test under the conditions of vegetable oil in frozen state and oil-paper insulation structure and partial discharge test were operated on 10 kV/315 kVA transformer at -30 ℃.The results of comparative test show that for the soybean insulating oil, voltage withstand level of vegetable oil in frozen state decreased 3.2kV. Voltage withstand level of oil-paper insulation structure in frozen state increased 1kV. Completely frozen vegetable oil transformer passed pressure test and operated at the lowest temperature of -27 ℃ for 23 months in Chifeng of Inner Mongolia with good condition.
           Key words: vegetable insulating oil; transformer; low-temperature characteristics; solidification

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