电缆终端连接器与接线铜排接触电阻分析

当前,在使用电线电缆的过程中可能存在一些安全隐患情况,容易出现不良故障问题,影响电线电缆安全运行情况。为确保电线电缆能稳定运用,需依据科学检测技术和有效检测方式,做好电线电缆相关检测工作,降低电线电缆发生故障问题的概率。鉴于此,文章结合笔者多年工作经验,对电缆终端连接器与接线铜排接触电阻分析提出了一些建议,仅供参考。

考虑电磁热耦合的航空变频交流真空接触器热特性研究

本文对航空变频交流真空接触器的温度场进行了电磁热耦合仿真与实验分析。在对热源进行计算时,着重分析中频360~800 Hz下集肤效应和邻近效应对接触器导电回路损耗的影响,并考虑温度与导体材料电阻率的变化关系,进行接触电阻的等效分析。在散热方面计算了接触器各表面的对流散热系数,同时考虑材料辐射系数的辐射散热作用和外接铜导线的传导散热作用。利用该模型进一步研究电流频率和高空环境对接触器温度场分布的影响,并且分析线圈线径对温升的作用,获得了航空接触器温升特性。搭建了真空接触器通流发热测试平台,利用实验数据验证了仿真结果,为真空接触器的设计优化提供了理论依据。

Analysis of the Correlation between the Level of Contact Degradation and the Dynamic Resistance Curve in Circuit Breakers

The DRM （dynamic contact resistance measurement） in high voltage circuit breakers is a manner of evaluating the internal ageing condition of the chamber. DRM is similar to static contact resistance measurement testing, but instead of measuring a single value when the breaker contacts are closed （static value）, the ohmic resistance is measured at various contact positions, from the beginning of the contact opening until a complete separation of the contacts. The relationship between the contact resistances of the new circuit breaker and the ageing circuit breaker in operation provides subsidy for the evaluation of both the main and arcing contact conditions. This research aims to analyze the correlation between the various levels of degradation of the contacts and the configuration of the DRM curve. This work considers curve samples from new acceleration tests. breaker chamber contacts and different levels of degradation by