基于氮化铝的OPGW交流融冰效率的研究

Abstract

输电线路覆冰事故严重威胁电网安全运行，抗冰防灾是电网建设的重点攻克技术之一，其中，地线融冰研究是常用的关键技术。基于复合光架空地线两层层绞式结构，采用无感双绞线作为融冰热源，实现对地线覆冰段交流融冰。本文采用高热导率半导体材料氮化铝填充导线层间空气气隙，提高融冰传热速度，缩短融冰时间，减少融冰热损耗，有效改进OPGW融冰效率。结合热路分析法，理论计算氮化铝提高融冰效率。制作OPGW交流融冰样品及氮化铝样品，实验得到两种样品融冰时间，对比分析氮化铝提高融冰效率是可行的。Ice accident on transmission lines influences the safe operation of power grid. Preventing ice dis-aster is one of the key technologies for the construction of power network. Ground wire ice-melt- ing technology is of great significance in conventional technology. Based on the layer stranded structure of Optical Fiber Composite Overhead Ground Wire (OPGW), a twisted bifilar wire fabricated by insulated wire is used as a heater for AC de-icing of ground wire. In order to enhance the heat transfer rate and shorten the ice-melting time as well as reduce the heat loss and improve ice melting efficiency, aluminum nitride, a semiconductor with high thermal conductivity, is used to fill in the gap among the conductor. An equivalent thermal circuit is established to calculate the de-icing efficiency of OPGW with aluminum nitride. With the samples of ice melting conductors, the ice melting time is analyzed based on de-icing conditions. It is confirmed that the ice melting efficiency of OPGW can be feasibly improved by filling the aluminum nitride.