摘要
采用小波分析实现单相接地保护容易产生误判和漏判现象,采用暂态分量的大小和方向实现单相接地保护的方法需要准确计算暂态分量的频率和相位。针对上述问题,文章结合大量的6 kV电网模拟电弧接地故障实验数据,提出了一种不需要零序电压暂态分量、不需计算暂态分量频率和相位的单相接地保护方法,详细分析了该方法的实现原理。实验结果表明,该方法计算简单、无需滤波,具有较高的准确性。
Using wavelet analysis to realize single-phase grounding protection is easy to produce misjudgement and missed sanction and the method using magnitude and direction of transient component to realize single-phase protection needs calculate frequency and phase of transient component accurately. To solve above problems, the paper proposed a single-phase grounding protection method that needs not zerosequence voltage transient component and needs not calculate frequency and phase of transient component combing with lots of experiment data of simulated arcing fault of 6 kV power networks and analyzed implementation principle of the method in details. The experiment result showed that the method has simple calculation, no filtering and higher accuracy.
出处
《工矿自动化》
2009年第12期60-64,共5页
Journal Of Mine Automation
基金
国家自然科学基金资助项目(50077022)
关键词
小电流接地系统
单相接地保护
电弧接地故障
暂态分量
零序电流
small current grounding system
single-phase grounding protection
arcing fault
transient component
zero-sequence current
