烷基苯热解产气规律与基于DGA的充油电缆故障诊断  

Pyrolysis Gas Production Law of Dodecylbenzene and Fault Diagnosis of Oil-filled Cable Based on DGA

作　　者：廖建平[1] 楚金伟[1] 高帆 陈宇飞 刘星伟 张晨 李华强[2] 钟力生[2] LIAO Jianping;CHU Jinwei;GAO Fan;CHEN Yufei;LIU Xingwei;ZHANG Chen;LI Huaqiang;ZHONG Lisheng(Maintenance and Test Center of EHV Transmission Company of China Southern Power Grid Co.,Ltd.,Guangzhou 510405,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]中国南方电网公司超高压输电公司检修试验中心,广东广州510405 [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

出　　处：《绝缘材料》2021年第8期109-114,共6页Insulating Materials

基　　金：南方电网超高压输电公司科技项目(CGYKJXM20180112)。

摘　　要：为了检验现有的DGA故障诊断方法对于充油海缆的适用性,选用国产十二烷基苯绝缘油进行研究。首先采用不同升温速率的热重试验确定十二烷基苯绝缘油的分解温度;随后搭建试验平台,开展十二烷基苯纯油、油纸以及25#矿物油在150、250、350℃下的热故障模拟试验;试验后测量故障油样中溶解的H2、CH4、C2H6、C2H4、C2H2共5种特征气体的百分含量,研究十二烷基苯绝缘油在过热故障下的产气规律;选用现有的DGA故障诊断方法(Duval三角形、四边形图示法)对测得的溶解气体数据进行分析。结果表明:热故障下十二烷基苯绝缘油中溶解的C2H4百分含量占比会随故障温度升高明显增加,矿物油中C2H4百分含量占比在整个故障温度范围内始终处于较低水平;在热故障诊断时,经典Duval三角形以及四边形图示法可以通过十二烷基苯绝缘油中溶解的气体检测出热故障,但不能够准确地判定故障温度范围,需要对方法中的故障边界做进一步修改。In order to verify the applicability of DGA fault diagnosis methods in oil-filled submarine cable,we chose domestic dodecylbenzene (DDB) insulating oil as research object.First,the decomposition temperature of DDB insulating oil was determined by thermogravimetric test under different heating rates.Subsequently,a test system was built to carry out thermal fault simulation tests of DDB pure oil,oil-paper,and 25# mineral oil at 150,250,and 350℃.After test,the percentage of five characteristic gases (H2,CH4,C2H6,C2H4,C2H2) dissolved in the fault oils was measured to study the gas production law of DDB insulating oil under thermal fault.Finally,existing DGA diagnostic methods (classic Duval triangle,quadrilateral graphic method) were selected to analyze the gas data.The results show that the proportion of C2H4 dissolved in DDB insulating oil under thermal fault increase significantly with the increase of fault temperature,and the proportion of C2H4 in mineral oil is at a low level in the whole temperature range.In the thermal fault diagnosis,the classic Duval triangle and quadrilateral graphical method can detect thermal faults by the dissolved gas in DDB insulating oil,but the temperature range of thermal fault cannot be determined accurately,and the fault boundary need to be further modified.

关 键 词：油中溶解气体分析 烷基苯 热重分析 热故障 

分 类 号：TM214[一般工业技术—材料科学与工程]