考虑尾流效应的新月形覆冰四分裂输电线舞动稳定性

针对新月形覆冰四分裂输电线各子导线气动参数不同的问题提出一种考虑尾流影响的临界风速计算方法。基于拟静态理论得到覆冰四分裂输电线的气动载荷,建立等效的3自由度覆冰四分裂输电线力学舞动模型。在初始风攻角处将气动系数泰勒展开。新月型覆冰四分裂导线的空气动力系数由风洞模拟试验测得。根据理论公式,使用MATLAB进行编程计算临界风速,将由理论确定的临界风速与根据Den Hartog和Nigol理论确定的临界风速进行对比分析。分析垂直、水平以及扭转振动频率和覆冰厚度对临界风速的影响。研究成果对于覆冰四分裂输电线路稳定性判断具有重要的理论指导意义。

Galloping Stability Analysis of Quad-bundled Conductors with Crescent Ice Covering ConsideringWake Effect

A critical wind speed calculation method considering the wake effect is proposed for quad bundled conductors with crescent ice-covering.Based on the quasi-static theory,the aerodynamic load of the iced quad bundled conductor is obtained,and the equivalent 3-DOF dynamic model of the quad bundled conductor is established.The aerodynamic coefficient is expanded with Taylor formula in the vicinity of initial attack angle.The aerodynamic coefficients of the quad bundled conductor with crescent ice-covering are measured by wind tunnel testing.According to the theoretical formula,MATLAB is used to calculate the critical wind speed.This critical wind speed is compared with that determined by Den Hartog and Nigol theory.The influence of vertical,horizontal and torsional vibration frequencies and the ice thickness on the critical wind speed is analyzed.The research results have important theoretical guiding significance for the stability judgment of iced quad bundled conductors.