變壓器用植物絕緣油的低溫特性試驗研究 

王珊珊，周竹君，梁嗣元 
國網電力科學研究院武漢南瑞有限責任公司，湖北 武漢 430074 
 

摘 要：為研究凝點低的植物絕緣油對變壓器絕緣強度的影響，用絕緣油耐壓測試儀對凝固狀態(tài)下的植物油、油紙絕緣結構進行耐壓試驗，并在高低溫交變試驗室對-30 ℃下的10 kV/315 kVA冷凍變壓器實物進行耐壓及局部放電試驗。通過對比試驗結果表明，對于大豆絕緣油，凝固后的絕緣油耐壓下降了3.2 kV；油紙混合結構的耐壓水平基本沒變，凝固狀態(tài)下的耐壓值提高了1 kV；完全冷凍后的植物油變壓器順利通過耐壓試驗，且在最低氣溫為-27 ℃的內蒙古赤峰掛網運行23個月，運行情況良好。
關鍵詞：植物絕緣油；變壓器；低溫特性；凝固
中圖分類號：TM855 文獻標識碼：A 文章編號：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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