输电塔线体系模态分析

采用有限元分析软件ANSYS建立了一塔两跨的有限元分析模型,对该塔线体系的模态及固有频率进行了分析,发现绝缘子的结构型式会对输电线的面外振型产生影响,左相及右相导线的绝缘子可随导线面外舞动发生摆动,因此其面外振型可出现左右两跨整体的面外1个半波和3个半波,而中相导线的绝缘子不能发生面外摆动,因此其面外振型只是2个半波或4个半波;塔线体系中存在各相及各跨导线局部模态密集的动力学特性,当覆冰导线发生舞动时,该特性会对塔线耦合体系的受力、变形特征产生重要影响.

Modal analysis of transmission tower-line system

A two-span tower-line system finite model was established by ANSYS,modal and natural frequency of the towerline system was analyzed.Analysis found that the different construction type of the insulators lead to different mode shapes of the out plane between left and right phase conductors with the middle ones.Since the insulator of left and right phase conductors can occur swing with the out plane galloping of conductor,therefore out plane mode shapes can occur one half-wave and three half-wave,but middle phase conductors only have two half-wave or four half-wave.Because dynamics characteristics that dense partial modal of each phase and span conductor exist in tower-line system,it may bring great influence on stress and deformation of tower-line system when the galloping of iced conductor.