盘形悬式瓷绝缘子在多刚体模型下的风偏应力分析

Analysis on Windage Yaw Stress of Porcelain Cap and Pin Insulator on Multi-Rigid Model

分析模拟盘形悬式瓷绝缘子串风偏运行时承受的应力大小可预防风偏闪络事故的发生。对此采用ANSYS Fluent计算流体动力学(CFD)软件,建立了基于RNG k-ε湍流模型的绝缘子串-导线三维模型并进行分析。首先计算出刚体与多刚体模型在多种风速下受到的von-Mises等效应力情况,并将两者与受力公式的计算结果进行对比分析。为进一步研究绝缘子串上不同位置的受力,又模拟并比较了多刚体模型在不同风速时相应位置的受力大小。结果表明,在风速大于30 m/s时,多刚体模型由于考虑风偏过程中各绝缘子之间的定点转动现象,更接近绝缘子串实际受力情况;多刚体模型在不同风速时,与横担连接的绝缘子钢帽球窝处所承受的等效应力总是最大,并由上至下逐渐减小,可为盘形悬式瓷绝缘子承载能力的设计与安装提供理论参考。

Analysis of the magnitude of the stress experienced by the porcelain insulator string during windage yaw can prevent flashover accidents. Based on ANSYS Fluent computational fluid dynamics( CFD) software,a three-dimensional model of insulator string-conductor on account of RNG k-εmodel is established. Firstly,the von-Mises equivalent stress of rigid and multi-rigid models under various wind speeds is calculated,and the two are compared with the results of empirical formulas. Then,in order to study the stress on different positions of the insulator string,the stress on the corresponding position of the multi-rigid model at different wind speeds is simulated and compared. The results show that when the wind speed is more than 30 m/s,the multi-rigid model is closer to the actual stress of insulator string due to the fixed-point rotation between insulators in the course of windage yaw. When at different wind speeds,the maximum equivalent stress on a multi-rigid model is always at the insulator steel cap ball nest connected to the cross-rack,and gradually reduces from top to bottom,which can provide theoretical reference for the design and installation of the bearing capacity of porcelain insulator string.