SF_6电流互感器绝缘缺陷的放电及气体分解特性  

Discharge and Gas Decomposition of Typical Insulation Defects in 500 kV SF_6 Current Transformer

作　　者：王圆圆[1] 邵颖彪 王世谦[1] 苗福丰 田春筝[1] 汲胜昌[3] 

机构地区：[1]国网河南省电力公司经济技术研究院,河南郑州450052 [2]国网河南省电力公司电力科学研究院,河南郑州450052 [3]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：《中国电力》2016年第11期63-69,共7页Electric Power

摘　　要：选取铝筒均压型和电容屏均压型的500 kV SF_6电流互感器(CT)试品,研究了绝缘子沿面缺陷和复合缺陷下的放电及气体分解特性,并分析了缺陷类型、放电路径长度和采气位置对该特性的影响。发现相位分辨率的脉冲序列(PRPD)谱图是气体分解特性研究的良好辅助手段,改良设计的采气口检测结果更准确。绝缘介质缺陷的典型特征是含C物质(CF_4、CS_2)的生成。绝缘子沿面缺陷下SO_2含量高于SO_2F_2,S_2OF_(10)的含量增长率较低,且放电路径长度会影响典型产物的种类。复合缺陷下SO_2F_2和SO_2的含量增长率较高,S_2OF_(10)的含量增长率相对低。Two 500 kV SF6 CTs with aluminum cylinder grading structure and cone capacitor grading structure are selected to analyze discharge and gas decomposition characteristics of insulator surface defect and combining defect. The influences of defect type, discharge path length and sampling positions are discussed. It is found that measuring PRPD is an effective assistant method for gas analysis. The detection results of the improved sample port are more accurate than that of regular one. Typical gas decomposition products of the insulation material related defects are CF4 and CS2. In insulator surface defect, concentration of SO2 is higher than SO2F2; the growth rate of S2OF10 concentration is relatively low; types of decomposition products vary with discharge path length. In the combining defect, the growth rates of SO2F2 and SO2 are relatively higher than that of S2OF10.

关 键 词：SF6 CT 绝缘缺陷 气体分解 PRPD 

分 类 号：TM855[电气工程—高电压与绝缘技术]