變壓器用植物絕緣油的低溫特性試驗(yàn)研究
王珊珊，周竹君，梁嗣元
國(guó)網(wǎng)電力科學(xué)研究院武漢南瑞有限責(zé)任公司，湖北 武漢 430074
摘 要：為研究凝點(diǎn)低的植物絕緣油對(duì)變壓器絕緣強(qiáng)度的影響，用絕緣油耐壓測(cè)試儀對(duì)凝固狀態(tài)下的植物油、油紙絕緣結(jié)構(gòu)進(jìn)行耐壓試驗(yàn)，并在高低溫交變?cè)囼?yàn)室對(duì)-30 ℃下的10 kV/315 kVA冷凍變壓器實(shí)物進(jìn)行耐壓及局部放電試驗(yàn)。通過(guò)對(duì)比試驗(yàn)結(jié)果表明，對(duì)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(jié)構(gòu)的耐壓水平基本沒(méi)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(guò)耐壓試驗(yàn)，且在最低氣溫為-27 ℃的內(nèi)蒙古赤峰掛網(wǎng)運(yùn)行23個(gè)月，運(yùn)行情況良好。
關(guān)鍵詞：植物絕緣油；變壓器；低溫特性；凝固
中圖分類(lèi)號(hào)：TM855 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：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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