双分裂导线覆冰等效圆柱表征方法及试验验证

Study on the Equivalent Representation Method on the Degree of Bundle Conductors and Experiment for Verification

分裂子导线流场间的耦合影响是造成分裂导线和单导线覆冰特性差异的主要原因。根据导线覆冰增长理论,该文提出用等效圆柱来表征分裂导线覆冰程度的计算模型,并研究了等效圆柱直径与覆冰时间、覆冰环境参数(温度、风速、水滴中值直径)、双分裂导线结构(导线直径、分裂间距)之间关系。研究结果表明:双分裂导线等效圆柱直径受环境温度和覆冰时间的影响较小,但随风速、水滴中值直径的增大而逐渐增大,增长趋势逐渐饱和。等效圆柱直径随双分裂导线结构组合参数增大而减小,两者存在指数拟合关系。并在人工气候室内搭建平台,结果显示等效圆柱和双分裂导线覆冰量最大相对误差为2.5%,验证了该方法的有效性。

The coupling effect of bundle conductors from flow fields is the main reason for the difference of ice-covering characteristics between bundle conductors and single-conductor.In this paper,an equivalent cylinder is proposed to represent the degree of icing on bundle conductors based on the icing growth model,and the relationship between the equivalent cylinder diameter and icing time,environmental parameters(temperature,wind speed,median diameter of droplets),and the structure of bundle conductors(wire diameter,splitting distance)is studied.The results show that the equivalent cylinder diameter of bundle conductors is negligibly affected by temperature and icing time,but increases with the wind speed and the median diameter of droplets,and the trend becomes saturated gradually.The relationship of exponential fitting between equivalent cylinder diameter and combined parameters of bundle conductors is found.The experimental platform has been built in an artificial climate chamber,and the results show that the maximum relative error of ice covering amount of equivalent cylinder and bundle conductors is 2.5%,which verifies the effectiveness of the method.