中性点谐振接地的配电网故障选线方法  

Faulty line detection of resonance - grounding distribution system

作　　者：蔡金锭[1] 熊志伟[2] 

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108 [2]福建农林大学机电学院,福建金山350002

出　　处：《电力自动化设备》2008年第1期43-46,共4页Electric Power Automation Equipment

基　　金：福建省自然科学基金项目(2007J0017);福建省教育厅科学基金项目(JB06045)~~

摘　　要：应用在高频空间具有良好聚焦性的小波包工具,对故障后线路中的暂态零序电流进行分解,提取暂态零序电流在选定频带内的高频分量,以故障线与非故障线的零序电流高频分量之和的测度和故障线与非故障线的电流测度之和作为系统故障的特征信息,提出一种新的基于零序电流高频分量的故障选线判别方法;以自定义系统的故障特征值为主判据、故障电流高频分量为辅助判据实现故障类型的判断。通过实验仿真证明,提出的这种故障选线的判别方法有较强的抗白噪声干扰能力以及它不受系统中性点接地方式的影响,故障选线准确率更高。可适合于各种不同接地方式的配电网的单相接地故障选线。A faulty line detection method based on the high- frequency components of zero -sequence current is proposed. It applies wavelet packet tools,which has good focusing performance in high-frequency space,to decompose the post-fault transient zero-sequence currents of lines to pick up its high-frequency components in the selected frequency bands,and calculates the sum of zero-sequence current high-frequency components of both faulty line and healthy lines and the sum of their currents as the characteristic information of faulty system. The calculated characteristic eigenvalue is taken as the main criterion and the fault current high frequency components as the associate criterion. Simulative experiments show that,the proposed method has good white- noise proof capability and high faulty-line detection accuracy,suitable for systems of different grounding types.

关 键 词：配电网 小波包 故障选线 暂态电流 

分 类 号：TM711[电气工程—电力系统及自动化]