A Theoretical Algorithm for Jump Heights of Iced Transmission Lines After Ice Shedding
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摘要: 建立连续档线路脱冰理论分析简化模型,基于导线脱冰跳跃过程中的能量关系、应力弧垂关系、变形关系和平衡关系,给出求解导线最大脱冰跳跃高度的理论计算方法.利用算例与数值模拟方法和Morgan理论算法进行比较,验证了方法的正确性.进而针对典型输电线路的脱冰跳跃问题,利用获得的理论算法、数值模拟方法与现行输电线路设计规程中的脱冰跳跃高度计算公式的计算结果进行比较分析,讨论了该理论算法的实用性.采用所获得的冰跳高度理论算法,可在冰区输电线路的设计中快速确定导线冰跳时的绝缘间隙.Abstract: An analytical model for multi-span transmission lines to estimate jump heights after ice shedding was set up, and an algorithm for the jump heights was developed by means of the energy equation, stress-sag relation, deformation and balance relation of the lines during the motion after ice shedding. The algorithm was verified through the comparison of the line jump heights determined respectively with the present algorithm, the finite element method and the Morgan theoretical algorithm. Furthermore, the present algorithm, the finite element method and the formula proposed in the Chinese design code for transmission lines were employed to evaluate the jump heights of typical transmission lines with different parameters after ice shedding, based on which the practicability of the present algorithm was discussed. It is indicated that the present algorithm could be used easily and quickly to determine the isolation clearance in the design of transmission lines located in icing zones.
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Key words:
- iced transmission line /
- ice shedding /
- jump height /
- theoretical algorithm /
- numerical simulation
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