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卞佳音 《中华医学图书情报杂志》2014,(1):11-13
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。 相似文献
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江日洪 《中华医学图书情报杂志》2010,(2):9-11
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。 相似文献
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江日洪 《中华医学图书情报杂志》2011,(2):9-11
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。 相似文献
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张立林 《中华医学图书情报杂志》2014,(1):37-39
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。 相似文献
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Farah Asyikin Abd Rahman Mohd Zainal Abidin Ab Kadir Ungku Anisa Ungku Amirulddin Miszaina Osman 《Materials》2021,14(7)
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. 相似文献
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