OPGW临界融冰电流及其影响因素

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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。

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	蒋兴良
	孟志高
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	姚实颖

关键词 ： OPGW, 临界融冰电流, 环境温度, 风速, 覆冰厚度

Abstract：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 ice-melting 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.

Key words： Optical fiber composite overhead ground wire (OPGW) critical ice-melting current ambient temperature wind velocity ice thickness

收稿日期: 2015-04-10 出版日期: 2016-07-07

PACS:

TM852

基金资助: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)和国家创新研究群体基金(51021005)资助。

通讯作者: 孟志高男,1990年生,博士研究生,研究方向为复杂大气环境中输电线路外绝缘、输电线路覆冰及防护。E-mail:mengzhigao718@163.com(通信作者)

作者简介: 蒋兴良男,1961年生,博士,教授,博导,研究方向为电气工程领域高电压与绝缘技术。E-mail:xljiang@cqu.edu.cn

引用本文:

蒋兴良, 孟志高, 张志劲, 姚实颖. OPGW临界融冰电流及其影响因素[J]. 电工技术学报, 2016, 31(9): 174-180. Jiang Xingliang, Meng Zhigao, Zhang Zhijin, Yao Shiying. Critical Ice-Melting Current of Ice-Covered OPGW and Its Impacting Factors. Transactions of China Electrotechnical Society, 2016, 31(9): 174-180.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I9/174

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