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输电线路产生的工频电磁场会对汽车起重机等工程机械的高空作业部分产生严重的电磁骚扰,影响其正常作业。为解决该问题,根据输电线路电磁场的特性和汽车起重机的结构特点,采用有限元法计算了空间电磁场分布;基于Rachidi场线耦合模型分析了控制器局域网络总线的耦合响应及吊臂外壳的电位分布,并分析了吊臂长度、仰角及其与输电线路水平距离等参数对吊臂外壳电位分布的影响。结果表明,输电线路产生的电磁场导致汽车起重机吊臂外壳两端产生了近1.6 V的电位差,进而产生电磁骚扰;在汽车起重机相关部位喷涂绝缘漆,或者优化车载电子系统的接地方式,可以避免该类型的电磁骚扰,保证设备正常工作。
Power frequency electromagnetic field generated by transmission lines will cause serious electromagnetic disturbance to aerial work parts of construction machinery such as truck cranes, affecting their normal operation. In order to solve this problem, according to the characteristics of transmission line electromagnetic field and the structural characteristics of truck crane, the electromagnetic field distribution in space was calculated by finite element method. Based on Rachidi field-line coupled model, the coupling response of controller bus and the potential The influence of boom length, elevation angle and its horizontal distance with transmission line on the potential distribution of boom shell was analyzed. The results show that the electromagnetic field generated by the transmission line leads to a potential difference of 1.6 V near the crane crane shell at both ends of the crane, resulting in electromagnetic disturbance. Spraying insulating paint on the relevant parts of the truck crane or optimizing the grounding of the vehicle electronic system can avoid This type of electromagnetic disturbance, to ensure the normal operation of equipment.