基于氮化铝的新型融冰导线的研究

Research on a New Kind of Ice-melting Line with Aluminum Nitride

与现有架空线路热力融冰技术不同,设计一种内置绝缘双绞铜线加热器的融冰导线,实现线路覆冰段交流融冰。为了进一步提高融冰导线的传热效率,用含有高导热的氮化铝涂料填充导线内部的气隙。基于传热学原理,对融冰导线的传热效果进行理论分析,制作试样并进行融冰实验。研究结果表明:设计的融冰方法具有可行性。氮化铝混合物的加入会明显改善导线的传热效果,极大地降低导线内部温升,因而,在保证融冰导线热稳定性的前提下,允许进一步增大融冰功率,缩短融冰时间,提高融冰效率。

Differing from the existing thermal ice-melting technology for overhead lines, a new kind of ice-melting line with a heater, bifilarly wound by insulated twisted-pair copper wires and set along the axis of overhead lines, is proposed for alternative current (AC) de-icing of overhead lines. In order to improve the heat transfer efficiency of ice-melting lines, the gap among wires of overhead line is filled by mixture of epoxy resin and Aluminum Nitride (AlN), a kind of semi-conductor powder with high thermal conductivity. Based on the principles of heat transfer, theoretical analysis on heat transfer effects of ice-melting lines is made. After preparing some specimen, the ice-melting experiment is also carried out. The results have verified the feasibility of the ice-melting method and also have manifested that adding AlN mixture obviously improves the heat transfer efficiency of lines and the inner temperature rise significantly decreases. Consequently, adding AlN mixture shortens ice-melting time and improves ice-melting efficiency on the premise of guaranteeing thermal stability of ice-melting lines and allows further increase of ice-melting power.