特高压V型绝缘子串风偏研究

发布时间：2018-02-17 05:33

本文关键词： 特高压 V型绝缘子串风偏有限元变形特性脉动风　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国特高压输电工程的建设,特高压输电线路在我国经济建设中的地位越来越重要,而风偏闪络则是危害输电线路安全运行的主要原因之一。V型绝缘子串具有降低风偏危害和减小走廊宽度的优点,研究V型绝缘子串的风偏特性对于保证线路安全运行,减小建设费用具有重要意义。本文在以往研究的基础上,采用有限元对V型绝缘子串的风偏特性进行了较为全面的研究,主要进行了以下三个方面的工作:(1)根据瓷绝缘子片间球铰连接方式,通过系列简化推导了球铰的等效摩擦系数。考虑球铰摩擦和限位的影响建立了V型瓷绝缘子串有限元模型,球铰以连接单元的Join+Rotation方式模拟。在此基础上研究了V型瓷绝缘子串的风偏受力变形特性,并分析了球铰摩擦、限位对V串整体风偏受力的影响。最后讨论了风偏计算时V型瓷绝缘子串夹角的计算方法。(2)假定复合绝缘子芯棒材料为正交各向异性,同时考虑拉压异性,采用Fortran语言编写了用于Abaqus计算的芯棒材料本构模型UMAT子程序,用于后续有限元分析。建立复合绝缘子芯棒三维实体模型对其特性值屈曲和非线性后屈曲特性进行了研究,并以最大容许压应力确定芯棒受压的最不利状态。以梁单元模型研究了V型复合绝缘子串的风偏特性。在以上研究的基础上,推导了考虑背风侧绝缘子受压时最小V串夹角的计算公式,并与规范规定进行了对比。(3)建立了V型复合绝缘子串-导线耦合模型,并采用谐波叠加法生成输电线路人工脉动风场。分别对耦合模型施加平均风和脉动风荷载,对V串风偏计算时的导线耦合作用、V串两侧导线悬挂高差影响和脉动风动力放大效应进行了详细分析,并给出了相应的风偏荷载修正系数。
[Abstract]:With the construction of UHV transmission projects in China, UHV transmission lines play an increasingly important role in the economic construction of our country. The wind-biased flashover is one of the main reasons that endanger the safe operation of transmission line. V-type insulator string has the advantages of reducing the wind deviation harm and reducing the width of corridor. The wind deviation characteristics of V-type insulator string are studied to ensure the safe operation of the transmission line. It is of great significance to reduce the construction cost. Based on the previous research, the wind deviation characteristics of V-type insulator string are studied comprehensively by using finite element method. According to the connection mode of ball hinge between porcelain insulators, the equivalent friction coefficient of ball hinge is deduced through series simplification. The finite element model of V-shaped porcelain insulator string is established considering the influence of ball hinge friction and limit position. The ball hinge is simulated by Join Rotation method of connection element. On this basis, the wind deflection deformation characteristics of V-shaped porcelain insulator string are studied, and the friction of ball hinge is analyzed. Finally, the calculation method of angle between V type porcelain insulator string is discussed, which assumes that the composite insulator mandrel material is orthotropic and takes into account the tension and compression difference. The UMAT subprogram of mandrel material constitutive model used for Abaqus calculation was compiled by Fortran language for the subsequent finite element analysis. A three-dimensional solid model of composite insulator mandrel was established to study its characteristic value buckling and nonlinear post-buckling characteristics. The most unfavorable state of mandrel compression is determined by the maximum allowable compressive stress. The wind deviation characteristics of V-type composite insulator string are studied by using the beam element model. The formula for calculating the minimum V string angle when considering the compression of the leeward insulator is derived, and the coupling model of the V type composite insulator string and lead is established by contrasting with the specification. The harmonic superposition method is used to generate the artificial pulsating wind field of transmission lines, and the mean wind and pulsating wind loads are applied to the coupled model, respectively. In this paper, the coupling effect of lead during the calculation of V-string wind deviation is analyzed in detail, and the influence of suspension height difference on both sides of V-string and the pulsating wind dynamic amplification effect are analyzed in detail, and the corresponding correction coefficient of wind deviation load is given.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM216;TU312.1

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