行波测距中故障性质自动识别算法的研究

摘要

利用行波法进行供电线路故障测距时,行波在故障点的反射受到故障点接触电阻的影响,反射行波的极性会发生变化.当故障点接触电阻小于行波波阻抗时,反射行波与入射行波极性相反；当接触电阻大于行波波阻抗时,反射行波与入射行波极性相同.本文基于这一原理,设计供电线路故障性质自动识别算法,可准确判断开路和短路故障类型[1-5].%The polarity of reflected traveling wave signal changes on the influence of contact resistance during the fault location process. It has opposite phase if the contact resistant is less than traveling wave resistant; it has same phase on the opposite situation. Based on this principle, an auto-recognition algorithm is designed, which can identify the fault type accurately.