直流输电系统共用接地极的暂态接地性能分析  

Analysis on Transient Grounding Performance of Common Grounding Electrodes in HVDC System

作　　者：郭剑[1] 朱艺颖[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2008年第24期46-49,54,共5页Power System Technology

摘　　要：针对直流输电系统共用接地极的几种故障类型,对入地电流的暂态过程进行频谱分析,总结出共用接地极入地电流暂态过程频谱低于200Hz的特点。基于此特点进一步分析共用接地极在入地电流暂态过程中的响应,得出如下结论:暂态响应的波形近似等同于入地电流的波形,暂态响应峰值与稳态响应的比值,即为暂态电流峰值相对于系统额定电流的比值。结合接地极设计的重要指标——跨步电压的标准,可得出如下结论:对共用接地极的设计可不必考虑故障时入地电流的暂态过程对周围环境的影响。For several fault types of common grounding electrode in HVDC system, the frequency spectrum analysis of transient process of earthing current is performed and the features that the frequency spectrum of transient process of earthing current of common grounding electrode is within the range from 0 to 200 Hz is obtained. Based on this feature, through the further analysis on the response of transient process of earthing current of common grounding electrode, following conclusion is obtained： the waveform of transient response is similar to that of the earthing current, and the ratio of the peak value of transient response to steady state response is equal to the ratio of the peak value of transient current to the rated current of the system. Combining with the important parameter for the design of grounding electrode, i.e., the limit of step voltage, it is not necessary for the design of common grounding electrode to consider the influence of transient process of earthing fault current on ambient environment.

关 键 词：共用接地极 暂态 接地性能 频谱 高压直流 输电 

分 类 号：TM86[电气工程—高电压与绝缘技术]