小电流接地系统故障选线的暂态零序电流变化率方法  

Transient Zero-sequence Current Changing Rate Method for the Fault Line Detection of Small Current Neutral Grounding System

作　　者：魏臻珠[1] 蒋建东[1] 陈帆[1] 杨海波 

机构地区：[1]郑州大学电气工程学院,河南郑州450001 [2]卫辉市电业局,河南卫辉453100

出　　处：《郑州大学学报（工学版）》2012年第1期106-108,128,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：郑州大学大学生创新性实验计划项目(2009CXSY097)

摘　　要：分析了小电流接地系统发生单相接地故障时暂态零序电流的特点,给出了利用故障线路与非故障线路暂态零序电流变化率差异的选线判据,提出了小电流接地系统故障选线的暂态零序电流变化率方法.该方法不受系统中性点接地方式、电压初相角、过渡电阻的影响,故障判别准确,选线灵敏度高,算法简单,实用性强.最后用Matlab中建立的小电流接地系统仿真模型验证了该方法的有效性.The transient zero-sequence characteristics in the case of single phase-to-ground fault in small current neutral grounding system are analyzed in this paper.And the fault line selection criterion based on the difference of transient current changing rate between the fault line and the non-fault line is given.Then the transient zero-sequence current changing rate method for the fault line detection of small current neutral grounding system is presented.The method,which can be immune to the variation of neutral grounding,voltage initial angle and transition resistance,has the characteristics of high sensitivity,reliability and practicality.Finally,the simulation model of small current neutral grounding system is built with Matlab and the simulation results showed the effectiveness of the method.

关 键 词：小电流接地系统 故障选线 暂态零序电流 变化率 

分 类 号：TM862[电气工程—高电压与绝缘技术]