为了解决传统的电缆故障定位谱数据冗余度高且定位精度低的问题,本文提出一种基于线性调频 Z 变换(CZT)的电缆故障高精度定位方法.首先根据传输线理论,分析故障电缆的分布参数和反射系数特征,然后对反射系数实部进行 CZT,最后采用迭代式滤波进行去噪,得到电缆故障定位谱.结果表明,本文所提方法的故障点识别误差为 0.025%～0.275%.相较于快速傅里叶变换(FFT),本文所提方法具有定位谱细化、分辨率高、冗余度低、故障定位精度高的优点.
High precision location of cable faults based on chirp-Z transform
In order to solve the problem of high redundancy and low positioning accuracy of traditional cable fault location spectrum data,this paper proposes a high precision cable fault location method based on chirp-Z transform(CZT).Firstly,according to the transmission line theory,the distribution parameters and reflection coefficient characteristics of the fault cable are analyzed.Then,CZT is performed on the real part of the reflection coefficient.Finally,iterative filtering is used to denoise and obtain the cable fault location spectrum.The results show that the fault point recognition error of the proposed method is 0.025%～0.275%.Compared with fast Fourier transform(FFT),the proposed method has the advantages of refined location spectrum,high resolution,low redundancy and high fault location accuracy.
frequency domain reflection methodcable fault locationreflection coefficientchirp-Z transform(CZT)
万方数据
维普
