污秽中CaSO_4质量分数对XWP2-160瓷绝缘子串交流污闪特性的影响  

Influence of CaSO_4 Content in Contamination on AC Pollution Flashover Characteristics of XWP_2-160 Porcelain Insulator String

作　　者：黄道春[1] 熊紫腾 张虎[1] 阮江军[1] 徐涛[2] 万小东[2] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]中国电力科学研究院,武汉430074

出　　处：《高电压技术》2016年第12期3803-3809,共7页High Voltage Engineering

基　　金：国家电网公司特殊条件下输变电设备绝缘技术科技攻关团队项目(GY71-11-053)~~

摘　　要：输电线路绝缘子在自然条件下表面积污成分中含有大量的CaSO4，而污秽中CaSO4对绝缘子污闪特性产生较大的影响。为此，以7片XWP2-160型绝缘子串为试品，在人工雾室中进行了人工污秽试验，研究了CaSO4对绝缘子污耐压及泄漏电流的影响规律。研究表明：随着CaSO4质量分数的增加，绝缘子串污耐压呈幂函数形式递增，泄漏电流峰值递减；在CaSO4作用下，可溶性物质密度（SCD）对绝缘子污耐压的影响程度是附灰密度NSDD影响程度的1．45～1．7倍，SCD对绝缘子泄漏电流峰值的影响程度是附灰密度（NSDD）影响程度的3~4倍；随着污秽度的提高，CaSO4质量分数的改变对绝缘子污耐压的影响逐渐增大；随着CaSO4质量分数的增大，SCD、NSDD的改变对绝缘子污耐压及泄漏电流峰值的影响逐渐减小。研究结果可为输电线路外绝缘设计和运维提供参考。A large amount of CaSO4 is contained in transmission line insulator contamination under the natural condi- tion, and the CaSO4 in contamination has an influence on the pollution flashover characteristics and leakage current of the insulator. Seven discs of XWP2-160 double-shed suspension porcelain insulator were used as test samples, and lots of artificial pollution tlashover tests were conducted in an artificial fog chamber, and the influence laws of CaSO4 content in contamination on polluted insulator string＇s pollution withstand voltage and leakage current were studied. The results show that, with the increase of CaSO4 content, the pollution withstand voltage will increase in the way of power function, and the leakage current peak value will decrease. With the effect of CaSO4, the influence degree of soluble contaminant density （SCD） on pollution withstand voltage is 1.45~1.7 times of that of NSDD, the influence degree of SCD on the leakage current peak value is 3-4 times of that of NSDD. With the increase of pollution degree, the influence of the change of CaSO4 content on the pollution withstand voltage will increase. Besides, with the in- crease of the CaSO4 content, the influences of the change of SCD and NSDD on the pollution withstand voltage and leakage current peak value will decrease. The research results can provide a reference for the outdoor insulation design, operation, and maintenance of transmission line.

关 键 词：CASO4 瓷绝缘子 污耐压 可溶性物质密度 附灰密度 泄漏电流峰值 

分 类 号：TM216[一般工业技术—材料科学与工程] TM75[电气工程—电工理论与新技术]