高压支柱瓷绝缘子力学特性分析及断裂机理研究

Mechanical Properties Analysis and Fracture Mechanism Study of High Voltage Post Porcelain Insulator

高压支柱瓷绝缘子断裂故障时有发生,对电力系统的安全稳定运行造成了严重的影响。结合对高压支柱瓷绝缘子的力学特性及断裂事故统计的分析,提出了弯曲力矩作用下和结冰膨胀下的瓷绝缘子断裂模型,系统地研究了瓷绝缘子的断裂机理。基于热-结构耦合场理论,建立了支柱瓷绝缘子的有限元数值计算模型,分析了不同弯矩载荷下和胶装区域发生不同程度结冰膨胀时支柱瓷绝缘子的应力分布情况及所受的最大拉应力变化规律,计算结果有效地验证了本文提出的瓷绝缘子断裂模型。该研究成果可为瓷绝缘子的安装设计和运行维护提供有效的理论指导和技术支持。

The fracture accidents of high voltage post porcelain insulator happened occasionally and it have serious impact on the safe and stable operation of the power system. Combined with mechanical properties study and statistical analysis of post porcelain insulator fracture accident, the fracture model under the action of bending moment and the freezing expansion is proposed, and the fracture mechanism of post porcelain insulator has been studied systematically. The fracture numerical calculation model of the post porcelain insulator is built based on the thermal-mechanical coupled-field theory, and analyzes the stress distribution of the post porcelain insulator and the largest tensile stress change rule under different bending load and different degree of freezing expansion occurred in binding regions, the effectiveness of the post porcelain insulator fracture model proposed has been verified by the calculation results, the research results can provide effective theoretical guidance and technical support for the installation, design and maintenance of the porcelain insulator.