OPGW临界融冰电流及其影响因素  

Critical Ice-Melting Current of Ice-Covered OPGW and Its Impacting Factors

作　　者：蒋兴良[1] 孟志高[1] 张志劲[1] 姚实颖[2] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400030 [2]国网四川省电力公司,成都610000

出　　处：《电工技术学报》2016年第9期174-180,共7页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展(973)计划(2014CB260401);输配电装备及系统安全与新技术国家重点实验室自主重点项目(2007DA10512714101);国家创新研究群体基金(51021005)资助

摘　　要：光纤复合架空地线(OPGW)覆冰影响电网安全稳定运行,采用直流融冰是防止OPGW发生覆冰事故的有效措施之一。建立了OPGW的直流融冰模型,计算了OPGW直流融冰过程中的动态温度特性,分析了OPGW的临界融冰电流及其影响因素,并在人工气候实验室对计算结果进行了验证。结果表明:融冰过程中冰层外表面的热交换系数对融冰过程影响很大,其大小与环境温度、风速、覆冰厚度和冰层外表面温度有关;影响OPGW临界融冰电流的主要因素有环境温度、风速、覆冰厚度和OPGW型式;临界融冰电流随环境温度降低、风速增加及覆冰厚度的增加而增加,但冰厚的影响程度相对较小。因此,应根据不同环境条件选择OPGW的融冰电流。Atmospheric ice accumulation on the optical fiber composite overhead ground wire（ OPGW） may affect the safe and stable operation of power grid. The DC ice-melting technology is one of the effective measures to prevent the occurrence of the icing accident of the OPGW. A DC ice-melting model for the OPGW is firstly established. And then the dynamic temperature characteristics of the OPGW during the ice-melting process are calculated. Based on the model,the critical ice-melting current is calculated and its factors are analyzed. The icemelting experiments carried out in the multi-function artificial climate chamber show that the model in this paper is valid and practical. Both the calculated results and tested results show that the heat exchange coefficient on the ice outer surface has a great effect on the ice-melting process and it is closely concerned with the ambient temperature,the wind speed,the ice thickness,and the temperature of ice outer surface. Therefore,the critical ice-melting current of OPGW is related to the ambient temperature,the wind velocity,the ice thickness,and the type of OPGW. The critical ice-melting current increases with the decrease of the ambient temperature and the increase of the wind velocity. Under the same environment condition,the critical ice-melting current increases with the increase of the ice thickness,but the impact of the ice thickness is relatively small. Therefore,the DC ice-melting current must be chosen according to the environmental conditions.

关 键 词：OPGW 临界融冰电流 环境温度 风速 覆冰厚度 

分 类 号：TM852[电气工程—高电压与绝缘技术]