摘要
针对传统的到达时间差算法中时延估计存在误差的问题,提出了利用时间反转算法进行局部放电特高频定位的方法,该方法可以忽略波形模态的影响,无需直接进行时延估计。给出了该方法的具体步骤以及叠加和相乘两种幅值聚焦计算方式,分析了叠加和相乘两种幅值聚焦计算方式的特点。利用高斯—劳伦兹拟合函数局放模型,通过有限元分析软件进行仿真,验证了该方法的可行性,然后在实验室利用模拟放电源在气体绝缘组合电器气室内进行双通道定位实验,考虑了不同信噪比和多源情况对定位的影响,与时延定位法中的峰值法、互相关法以及能量积累法相比,该方法具有更高的定位精度,最后通过现场检测验证了该方法的实用性。
In view of error of time delay estimation in traditional time difference of arrival(TDOA)algorithm,a time reversal(TR)algorithm for UHF localization of partial discharge(PD)is proposed.This method can ignore the influ-ence of waveform modes and does not need to estimate the time delay directly.The specific steps of this method and the amplitude focusing calculation methods of superposition and multiplication are given.The characteristics of the two amplitude focusing calculation mode of superposition and multiplication are analyzed.Gauss-Lawrence fitting function model of partial discharge is used.The feasibility of the method is verified by the use of partial discharge model of Gaussian-Lorentz fitting function and by way of the finite element analysis software.Then,a two-channel positioning experiment is performed in the gas compartment of the gas-insulated combined switchgear by the use of simulation discharge source in the test laboratory and the influence of different signal/noise ratio and multiple sourc-es on the positioning is considered.This method,compared with the peak method,cross-correlation method and ener-gy accumulation method in the time-delay positioning method,has higher positioning accuracy.Finally,the practicali-ty of this method is verified by field detection.
作者
马鹏墀
王致杰
沈盼
王鸿
杨皖昊
付晓琳
MA Pengchi;WANG Zhijie;SHEN Pan;WANG Hong;YANG Wanhao;FU Xiaolin(Shanghai Dianji University,Shanghai 201306,China;State Grid Yancheng Dafeng District Electric Power Company,Jiangsu Yancheng 224100,China;Jiangsu Hongyuan Electric Co.,Ltd.,Nanjing 211100,China)
出处
《高压电器》
CAS
CSCD
北大核心
2022年第9期165-172,共8页
High Voltage Apparatus
基金
国家自然科学基金资助项目(51477099)
上海市自然科学基金资助项目(15ZR1417300)。
关键词
特高频
局部放电
时间反转
幅值聚焦
定位
ultra-high frequency
partial discharge
time reversal
amplitude focusing
positioning
