【摘要】 当架空输电线路发生输电线覆冰脱落时,将会对导线、地线、绝缘子、杆塔构件以及整个输电塔产生动力冲击作用。采用有限元数值模拟方法,建立四塔五线的塔线体系模型,模拟覆冰和脱冰现象,获得输电塔线体系的脱冰响应。计算结果表明:覆冰脱落使得邻近的导线产生低频舞动,绝缘子发生大幅摆动,输电塔部分杆件出现较大的峰值应力。同时使输电塔基底剪力、基底弯矩等大幅增加,并且越靠近脱冰档的杆塔,受到的冲击作用越大。更多还原

【Abstract】 Ice-shedding from overhead transmission lines will result in the dynamic impact effects on the conductors,shield wires,isolators,members of the tower and the whole tower. Finite element method is employed to construct the tower-line model and simulate the phenomena of ice-accreting and ice-shedding. Then the responses of the tower-line system due to ice-shedding are obtained. Results from this study show that,ice-shedding from conductors causes low-frequency vibration of the conductors and large-amplitude oscillation of the isolators. Many members of the tower experience high peak impact stresses. At the same time,ice-shedding causes a significant increase of the base shears and base moments of the transmission tower. The impacting effects of the transmission-tower line system due to ice-shedding may increase with the decreasing distance between the tower and ice-shedding span.更多还原