力场-电场-腐蚀介质联合作用下复合绝缘子的损伤机理与寿命评估

项目名称： 力场-电场-腐蚀介质联合作用下复合绝缘子的损伤机理与寿命评估

项目编号： No.51475264

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 赵新泽

作者单位： 三峡大学

项目金额： 85万元

中文摘要： 作为输电线路关键部件的复合绝缘子，主要由芯棒、伞裙护套及端部金具组成，通过各界面间的粘接或压接进行载荷传递。由于受导线振动引起的动载荷、不均匀电场、环境污秽腐蚀介质等联合作用，不可避免出现内部连接间发生微动与腐蚀磨损，外表面劣化等现象，导致绝缘子机械强度与绝缘性能退化，甚至断裂等直接影响整条线路的安全。本项目以复合绝缘子服役环境为背景建立扭振动载模拟试验平台，对其在力场-电场-腐蚀介质作用下的性能进行系统测试。基于试验中测得的绝缘子表面温度分布、电场畸变、应力应变、噪声等损伤过程信息，和试验后绝缘子结构、界面与表面的机械力学信息、电工学信息、微观结构组织以及材料理化性能等损伤终态信息，再结合绝缘子材料于等效环境模拟试验条件下获得的上述性能参数的变化，研究绝缘子在真实服役环境中的损伤模式、失效机理。在此基础上建立复合绝缘子在复杂环境下的失效模型，并实现对其的寿命评估。

中文关键词： 复合绝缘子；损伤机理；表面与界面；等效环境条件；寿命评估

英文摘要： As a key component of the transmission line, the composite insulator is mainly composed of the core rod, the umbrella covers and end hardware fitting. And the load is supported by the bonding or crimp contact from all interfaces in the internal of insulator. Due to combined action of dynamic load caused by the wire vibration, the non-uniform electric field, and the increasingly serious environment corrosive medium, there are fretting and corrosive wear between internal all assembly connectors and surface degradation, which will cause insulator mechanical strength and insulation performance degradation or even fracture. These will directly affect the safety of the power grid. To study the damage mechanism of composite insulator in service environment, a torsional vibration load simulation test system is set up in this project, and the performance of composite insulator is tested under combined action of the mechanical loading, electric field and corrosive medium by this system. The damage process information in experiment such as insulator surface temperature distribution, the electric field distortion, stress and strain, noise etc. can be obtained. The final state damage information including mechanical mechanics, electrotechnics, surface microstructure and material physical and chemical properties for composite insulator structure, interfaces and surfaces can be also obtained after experiment. Combine the above information with the change of the performance parameters of insulator material obtained through equivalent environment simulation test, the degradation process, modes and mechanisms of composite insulator in real service state will be researched. Based on the degradation model of composite insulator in a complex environment, the life assessment will be achieved finally.

英文关键词： composite insulation;damage mechanism;surface and interface;equivalent environment simulation test;life assessment