基于双曲正弦函数相位特性高压故障线路相位测距法

Fault location algorithm for HV transmission line based on phase characteristics of hyperbolic sine function

提出一种基于双曲正弦函数相位特性高压故障线路相位测距法。该方法在将故障位置作为已知条件看待并引入参考点与之匹配的思想基础上,构造了一个具有双曲正弦函数相位特性的故障测距函数。根据所取参考点与故障点相匹配时测距函数相位过零这一特征进行定位。该方法原理上不存在伪根,所需运算量远小于传统方法的运算量,能有效克服传统方法存在的测距精度和测距速度此消彼长的矛盾。仿真结果表明,该方法受过渡电阻、故障位置和故障发生角等因素的影响很小,具有很高的测距精度。

A new fault location function is generated based on the concept of selecting a reference point to match the fault position.It concludes that,the phase characteristics of the function is determined by the phase characteristics of hyperbolic sine function.The function has different phase characteristics between the reference point located at the left of the fault position and the reference point located at the right of the fault position,and the phase of the function equals to zero when the reference point matches the fault position.Based on the phase characteristics of the function,a new fault location algorithm is proposed.The proposed method has less calculation burden than the traditional methods,and can effectively overcome the contradiction between fault location precision and fault location speed which lies in the traditional methods.The accuracy is independent of fault transition impedance,fault type,fault location and incidence angle of the fault occurrence.The proposed method has no false root in theory.Results of EMTDC based simulation prove that the proposed method is correct and efficient.