一种适于高阻接地的单端时域测距算法  

A time-domain fault location algorithm for high resistance grounding using one terminal data

作　　者：罗显通[1] 罗建[1] 

机构地区：[1]重庆大学电气工程学院输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电力系统保护与控制》2010年第8期6-9,14,共5页Power System Protection and Control

摘　　要：单端时域故障测距的难点在于单相经高阻接地故障问题。为了解决该问题,针对传统单端时域测距算法在处理单相经高阻接地中所存在的不足,提出了一种基于电流相差估计的单端时域算法。该算法能根据过渡电阻的大小自动补偿故障距离的测量误差,具有对过渡电阻的自适应特性。算法的核心是建立过渡电阻、故障距离及电流相差角之间的约束方程组,其电流相差角用序网络的参数来表示,将过渡电阻和故障距离作为未知参数,利用最小二乘法对参数进行求解辨识,以实现准确的故障测距。EMTP仿真表明,该方法对于经过渡电阻的接地故障具有较高的测距精度。The difficult point of time-domain fault location using one terminal data is single-phase-to-earth fault with high fault resistance. To cope with this problem, this paper finds the defects of traditional fault location method in dealing with high resistance grounding fault, and proposes a time domain location algorithm using one terminal data based on estimating the current phase difference. The algorithm can automatically compensate measuring distance according to the fault resistance. The main idea of this algorithm is to establish constraint equations set among the fault resistance, fault distance and thephase difference angle of current, in which phase difference angle is replaced by the parameters of sequence network, the fault distance and fault resistance are solved as the unknown variables by least squares technique. EMTP simulation results show the this method has high accuracy for fault location of high resistance grounding.

关 键 词：故障测距 高阻接地 最小二乘法 电流相差角 EMTP仿真 

分 类 号：TM862[电气工程—高电压与绝缘技术]