高压电缆护层保护器的性能与应用分析

单芯高压电缆多采用保护器对电缆护层绝缘进行过电压保护,本文对高压电缆护层保护器的性能及选择应用进行了分析,结合一起护层保护器预试不合格案例,采用试验、解剖方法对其进行了研究,发现运行中的保护器不合格原因主要由受潮引起,并对保护器的检验安装给出建议。     

电力电缆线路的冲击特性长度与过电压保护配置

本文通过对雷电冲击波在电缆线路中的传播特性——冲击特性长度的分析和计算,提出了各电压等级电缆线路的冲击特性长度,可供电缆与架空线直连情况的过电压保护选用配置避雷器时参考。     

GB4793．1—2007《测量、控制和实验室用电气设备的安全要求 第1部分：通用要求》检测中需注意的几个常见问题

仪器的设施类别（过压类别）的确定，仪器的标志，仪器的介电强度试验，仪器的耐机械冲击和撞击；仪器的液体压力和泄漏试验；仪器使用的材料阻燃要求都是执行GB4793．1—2007标准的体外诊断设备的基本要求，是大多数企业在设计产品和执行此标准时会考虑的问题。     

电力电缆线路的冲击特性长度与过电压保护配置

本文通过对雷电冲击波在电缆线路中的传播特性——冲击特性长度的分析和计算,提出了各电压等级电缆线路的冲击特性长度,可供电缆与架空线直连情况的过电压保护选用配置避雷器时参考。     

220kV长城II回电缆线路护层接地系统故障原因分析

通过对220kV城东变220kV长城II回电缆线路护层接地系统故障进行分析,找出了可能的故障原因,提出了预防及改进措施。     

Electrical Performance of Polymer-Insulated Rail Brackets of DC Transit Subjected to Lightning Induced Overvoltage

The fourth rail transit is an interesting topic to be shared and accessed by the community within that area of expertise. Several ongoing works are currently being conducted especially in the aspects of system technical performances including the rail bracket component and the sensitivity analyses on the various rail designs. Furthermore, the lightning surge study on railway electrification is significant due to the fact that only a handful of publications are available in this regard, especially on the fourth rail transit. For this reason, this paper presents a study on the electrical performance of a fourth rail Direct Current (DC) urban transit affected by an indirect lightning strike. The indirect lightning strike was modelled by means of the Rusck model and the sum of two Heidler functions. The simulations were carried out using the EMTP-RV software which included the performance comparison of polymer-insulated rail brackets, namely the Cast Epoxy (CE), the Cycloaliphatic Epoxy A (CEA), and the Glass Reinforced Plastic (GRP) together with the station arresters when subjected by 30 kA (5/80 µs) and 90 kA (9/200 µs) lightning currents. The results obtained demonstrated that the GRP material has been able to slightly lower its induced overvoltage as compared to other materials, especially for the case of 90 kA (9/200 µs), and thus serves better coordination with the station arresters. This improvement has also reflected on the recorded residual voltage and energy absorption capacity of the arrester, respectively.