正负极性雷电冲击作用下棕榈油绝缘油的流注传播和击穿特性试验研究  

Streamer Propagation and Breakdown Characteristics of Palm Oil Insulating Oil Under Positive and Negative Lightning Impulse

作　　者：杨丰帆 余强 孙金莉 罗浪 武晓蕊 赵泽予 YANG Fengfan;YU Qiang;SUN Jinli;LUO Lang;WU Xiaorui;ZHAO Zeyu(State Grid Hubei Maintenance Company,Wuhan 430050,China)

机构地区：[1]国网湖北省电力有限公司检修公司,湖北武汉430050

出　　处：《绝缘材料》2022年第1期42-46,共5页Insulating Materials

基　　金：国网湖北省电力有限公司检修公司科技项目(B71520210001)。

摘　　要：相比于矿物油,天然酯绝缘油具有生物降解性高、无毒、耐火性强等优点,具有替代电力变压器中矿物绝缘油的潜力。本研究建立了一套包括高速图像采集系统、试验电源以及电信号测量系统的绝缘油雷电冲击放电特性试验系统,针对较为常见的棕榈油绝缘油和电力变压器中常用的矿物油,进行正、负极性雷电冲击放电特性试验研究。对比分析正、负极性雷电冲击作用下两种油中的流注停止长度、发展速度、间隙击穿特性。结果表明:在相同的外加电压水平和极性下,相比于矿物油,棕榈油绝缘油中的流注停止长度较长,流注发展速度较快;棕榈油绝缘油中的维生素A和维生素E含量对流注停止长度、速度和击穿电压没有影响;正、负极性电压下流注发展特性和击穿特性的差异主要来源于绝缘油中空间电荷对流注发展过程的影响。Compared with mineral insulating oil,natural ester insulating oil has the advantages of high biodegradability,non-toxicity,and strong fire resistance,which has the potential to replace mineral insulating oil in power transformer.A set of lightning impulse discharge characteristics test system including high-speed image acquisition system,test power supply,and electrical signal measurement system was established.The positive and negative lightning impulse discharge characteristics of palm insulating oil and mineral insulating oil were tested,and the stop length,development velocity,and gap breakdown characteristics of the streamer in two oils under positive and negative lightning impulse were compared and analyzed.The results show that under the same applied voltage and polarity,the streamer stop length in palm insulating oil is longer and the streamer development velocity is faster compared with the mineral insulating oil.The contents of vitamin A and vitamin E in palm insulating oil have no effect on the streamer stop length,development velocity,and breakdown voltage.The differences of streamer development characteristics and breakdown characteristics under positive and negative voltages mainly comes from the influence of space charge in insulating oil on the streamer development process.

关 键 词：雷电冲击 极不均匀场 天然酯绝缘油 流注放电 变压器 

分 类 号：TM214[一般工业技术—材料科学与工程]