高压电缆缓冲层烧蚀特征气体浓度的演变规律研究  

Research on concentration evolution law of ablative characteristic gas of high voltage cable buffer layer

作　　者：门业堃 郭卫 任志刚 潘泽华 刘博 高建 赵鸽[2] MEN Yekun;GUO Wei;REN Zhigang;PAN Zehua;LIU Bo;GAO Jian;ZHAO Ge(State Grid Beijing Electric Power Research Institute,Beijing 100075,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi′an Jiaotong University,Xi′an 710049,China)

机构地区：[1]国网北京市电力公司电力科学研究院,北京100075 [2]西安交通大学电工材料电气绝缘全国重点实验室,陕西西安710049

出　　处：《绝缘材料》2024年第12期108-115,共8页Insulating Materials

基　　金：国家电网有限公司科技项目(5108-202218280A-2-353-XG)。

摘　　要：皱纹铝护套结构高压电缆近年来频繁出现缓冲层烧蚀故障,但缺少有效的研判电缆缓冲层烧蚀严重程度的方法。为探究缓冲层在烧蚀过程中气体产物浓度的演变规律,用于诊断烧蚀缺陷严重程度,本文搭建了缓冲层烧蚀模拟实验平台,研究了不同含水率下缓冲层的烧蚀特征气体浓度随烧蚀时间的演变规律,并采用负指数函数n=-Aexp(-t/τ)+n_(0)对烧蚀特征气体浓度随烧蚀时间的变化规律进行定量分析。结果表明:C_(2)H_(4)、C_(2)H_(6)和H2的浓度均随烧蚀时间增加呈负指数关系增长;C_(2)H_(4)与C_(2)H_(6)浓度随含水率升高略有减小,而H2浓度则随含水率的升高而增大;C_(2)H_(4)与C_(2)H_(6)的生成速率系数A/τ可反映缓冲层是否受潮,H2的A/τ随缓冲层含水率的升高逐渐增大,有望作为判断缓冲层受潮程度的依据之一。In recent years,buffer layer ablation failure occurs frequently in high voltage cables with corrugated aluminum sheathed structure,but there is a lack of effective method to determine the severity of ablation defects in cable buffer layer.In order to explore the evolution law of gas product concentration during buffer layer ablation,and use it to diagnose the severity of ablation defects,a simulated experimental platform for buffer layer ablation was established in this paper.The law of ablative characteristic gas concentration of buffer layer with different water contents changing with ablation time was investigated,and the variation law was quantitatively analyzed by using a negative exponential function n=-Aexp(-t/τ)+n_(0).The results show that the concentration of C_(2)H_(4),C_(2)H_(6),and H2 increases in a negative exponential relationship with the increase of ablation time.With the increase of water content,the concentration of C_(2)H_(4)and C_(2)H_(6)decreases slightly,while that of H2 increases.The generation rate coefficient(A/τ)of C_(2)H_(4)and C_(2)H_(6)can reflect that whether the buffer layer is damp,and the A/τof H2 increases gradually with the increase of water content in buffer layer,which is expected to be one of the bases for judging the degree of damp of buffer layer.

关 键 词：高压电缆 缓冲层烧蚀 气隙放电 气体浓度 生成速率 

分 类 号：TM215[一般工业技术—材料科学与工程] TM247[电气工程—电工理论与新技术]