摘要
为解决现有故障选线方法效果不佳的问题,本文利用绝缘监测系统的选相功能及故障线路与非故障线路故障相暂态电流幅值能量特征的差异,提出了一种基于故障相暂态电流小波能量特征的故障选线新方法。首先,对故障相进行有效辨识,提取出各线路故障相的暂态电流信号,经消噪处理后得到纯故障分量。然后借助小波包的分解与重构得到各相小波能量特征;由于单相接地故障时故障线路故障相能量特征远大于非故障线路,从而可以通过比较各相能量特征的大小来确定故障线路。该方法物理机理明确,不受运行方式、线路成分、故障条件等因素影响,而且能够有效克服系统噪音、不对称分量的干扰。选线裕度大,可靠性高,有望应用于实际当中。
In order to solve the problem of poor effect of Existing Fault Line Selection; the paper utilizing the phase selection func- tion of insulation monitoring system, a method of fault line selection based on Wavelet energy feature of Fault-phase transient current is proposed in this paper. Firstly, effectively identify the faulty phase and extract the transient current signal of each phase fault, after noise elimination process to obtain pure fault component. Then, by means of wavelet packet decomposition and reconstruction to obtained each phase wavelet energy feature; since the energy characteristics of fault line fault phase is much greater than the non-fauh line When single-phase grounding, thereby, Fault line can be determined by comparing the size of each phase energy feature. This method has clear physical mechanism, unaffected by operating mode, circuit components, fault conditions, etc, and can effectively overcome the system noise, the interference of asymmetrical component. The line selection method has a large margin, and high reliability, is expected to be applied to practice.
出处
《黑龙江科技信息》
2016年第35期43-46,共4页
Heilongjiang Science and Technology Information
关键词
故障选线
故障相
暂态电流
小波能量
纯故障分量
Fault line selection
Fault phase
Transient Current
Wavelet Energy
Pure fault component
