基于行波模值比值与极性的选线选相法

鉴于小电流接地系统β、γ模量行波选线判据繁琐、相电流行波选线不能确定故障相,文中运用初始行波选线研究结果,推导β、γ模量比值关系式,结合相电流行波选线原理,综合提出一种新型的选线定相的方法,该算法通过判定相电流初始行波及两模量模极大值比值和极性进行在线分析,能更快更准选线定相,适用于安装有两相或三相TA的系统,满足不同现场的情况,最后通过仿真验证了本方法是正确有效的。

Fault Line and Phase Selection Based on Modulus Ratio and Polarity of Traveling Wave

Fault line selection based on β and γ modulus of with neutral non-effectively grounded system(NNG) is complex and fault line selection based on phase current traveling wave can not select fault phase.A novel fault line and phase selection method,which uses the result of current initial traveling wave and deduces the ratio relationship of β and γ modulus,was proposed in the paper.The algorithm can analyze faults on-line by determining the ratio of modulus maxima of phase current initial traveling wave and modulus.It is applied in the systems with two-phase or three-phase TAs and meets different site conditions.Simulation results show that the proposed method is correct and available.