雷电冲击电压作用下天然酯变压器匝间绝缘击穿特性及产气规律研究  

Research on breakdown characteristics and gas generation law of turn-to-turn insulation in natural ester transformer under lightning impulse voltage

作　　者：郭鹏鸿 李青 杜迎辉 刘冬迪 燕蕾 王新兵 董明[2] 邢亚东 徐永伟 GUO Penghong;LI Qing;DU Yinghui;LIU Dongdi;YAN Lei;WANG Xinbing;DONG Ming;XING Yadong;XU Yongwei(Shandong Electric Power Equipment Co.,Ltd.,Jinan 250022,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi′an Jiaotong University,Xi′an 710049,China;Shandong Power Transmission and Transformation Equipment Co.,Ltd.,Jinan 250104,China)

机构地区：[1]山东电力设备有限公司,山东济南250022 [2]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049 [3]山东输变电设备有限公司,山东济南250104

出　　处：《绝缘材料》2024年第12期124-129,共6页Insulating Materials

摘　　要：天然酯绝缘油具有闪点高、燃点高、可生物降解等优点,逐步在高电压等级的电力变压器中推广应用。为了对高电压、大容量天然酯变压器的绝缘结构设计提供基础数据支撑,本文以矿物油为参比,选取天然酯绝缘油作为试验对象,分析其在雷电冲击电压作用下的击穿特性和产气规律。结果表明:天然酯匝间绝缘雷电冲击击穿电压均在200 kV以上,随着匝间绝缘厚度和绝缘间隙距离的增大呈现上升趋势,且略小于相同条件下矿物油的击穿电压;油中溶解的H_(2)和C_(2)H_(2)是雷电冲击电压作用下的主要特征气体,其相对百分含量随绝缘间隙的增大而增大;采用Duval五边形法对油中溶解气体进行故障诊断,故障点的放电基本被诊断为高能放电,与雷电冲击所释放的能量一致。Due to its advantages of high flash point,high ignition point,and biodegradability,natural ester insulating oil is gradually being promoted and applied in high voltage level power transformers.In order to provide basic data support for the insulation structure design of high voltage and large capacity natural ester transformer,we took mineral oil as a reference,and selected natural ester insulating oil as the test object to analyze its breakdown characteristics and gas generation law under lightning impulse voltage.The results show that the lightning impulse breakdown voltage of natural ester turn-to-turn insulation is above 200 kV,with the increase of turn-to-turn insulation thickness and insulation gap distance,it shows an upward trend and is slightly lower than the breakdown voltage of mineral oil under the same conditions.H_(2) and C_(2)H_(2) dissolved in oil are the main characteristic gases under lightning impulse voltage,and their relative percentage content increases with the increase of insulation gap.The Duval pentagon method is used for fault diagnosis of dissolved gases in oil,and the discharge at the fault points are basically diagnosed as high-energy discharge,which are consistent with the energy released by lightning impulse.

关 键 词：天然酯变压器 匝间绝缘 雷电冲击 击穿特性 油中溶解气体 

分 类 号：TM214[一般工业技术—材料科学与工程]