高压电气设备瓷套管与法兰连接的弯曲刚度研究

Study on Bending Stiffness of Interconnected Part Between High Voltage Porcelain Bushing and Flange

通过分析高压电气设施结构法兰与瓷套管连接节点的构造特征,建立了基于瓷柱、法兰弯曲变形和胶装材料挤压变形描述的节点弯曲承载力学模型,然后通过理论推导提出了一个瓷套管与法兰连接等效弯曲刚度的解析公式;最后通过一个500 k V避雷器试验数据对本文提出的公式进行了验证。结果表明:应用本文公式得到结果与试验结果吻合;与我国现行电力设施抗震设计规范公式对比,新建公式计算结果误差为1.91%。本文公式由力学模型直接推导建立,不包含经验系数,能够揭示法兰与瓷套管连接部位的承弯机制,可用于电气设施结构的抗震计算。

By analyzing the structural features of the joints between the structural flanges and the porcelain bushing of high Voltage electrical installations, a bending mechanical model of the joints based on the description of the bending deformation of the porcelain post, the flanges and the deformation of the assembled materials is established. Then, the analytical formula of equiValent bending stiffness of porcelain bushing and flange connection is established by theoretical deriVation. Finally, A bending stiffness of a 500 kV arrester calculated by this formula is Verified by test data. The results show that the results ob- tained by applying the formulae are in agreement with the experimental results; Comparing with China＇s existing power plant seismic design specification formula, the error of the newly established formula is 1.91%. This formula is deduced directly from the mechanical model and does not include empirical coefficients. It can reVeal the bending mechanism of the joint between the flange and the porcelain bushing and can be used for the seismic calculation of the electrical installation structure.