基于Nuttall自卷积窗的10 kV配电电缆中间接头定位改进方法

doi:10.11930/j.issn.1004-9649.202006152

中国电力 ›› 2021, Vol. 54 ›› Issue (4): 26-32.DOI: 10.11930/j.issn.1004-9649.202006152

• 高压电缆及附件关键技术专栏 • 上一篇下一篇

基于Nuttall自卷积窗的10 kV配电电缆中间接头定位改进方法

徐兴全¹, 桂媛¹, 姚玉海¹, 王智晖¹, 李蓉², 周凯², 谢敏³

1. 国网北京电力科学研究院, 北京 100075;
2. 四川大学电气工程学院, 四川成都 610065;
3. 国家电网无锡供电公司, 江苏无锡 214000

收稿日期:2020-06-12 修回日期:2020-08-05 发布日期:2021-04-23
作者简介:徐兴全(1984-),男,硕士研究生,从事变配电设备高压试验、故障分析及运行状态检测研究,E-mail:66655702@qq.com;李蓉(1996-),女,通信作者,硕士研究生,从事电力设备状态检测与故障诊断研究,E-mail:lirong_sky@163.com;周凯(1975-),男,教授,博士生导师,从事电缆绝缘状态检测与修复研究,E-mail:zhoukai_scu@163.com
基金资助:
国网北京市电力公司科技项目(No.52022319004C)；国家自然科学基金资助项目(No.51877142)

An Improved Location Method of 10 kV Cable Joints Based on Nuttall Self-Convolution Window

XU Xingquan¹, GUI Yuan¹, YAO Yuhai¹, WANG Zhihui¹, LI Rong², ZHOU Kai², XIE Min³

1. State Grid Beijing Electric Power Research Institute, Beijing 100075, China;
2. College of Electrical Engineering, Sichuan University, Chengdu 610065, China;
3. State Grid Wuxi Power Supply Company, Wuxi 214000, China

Received:2020-06-12 Revised:2020-08-05 Published:2021-04-23
Supported by:
This work is supported by Science and Technology Project of State Grid Beijing Electric Power Company (No.52022319004C), National Natural Science Foundation of China (No.51877142)

摘要/Abstract

摘要： 为解决现阶段采用离散傅里叶变换（discrete Fourier transform，DFT）分析电缆首端输入阻抗谱时存在频谱泄露和栅栏效应的问题，提出一种基于Nuttall自卷积窗的10kV配电电缆中间接头定位改进方法。首先，应用含有中间接头的电力电缆传输线模型、电缆输入阻抗谱、中间接头定位原理、加窗傅里叶变换（windowed Fourier transform，WFT）简要说明本文所提方法原理。接着，选取窗函数（Hamming窗、Blackman窗、四项三阶Nuttall窗、二阶Nuttall自卷积窗），详细分析窗函数性能。然后，通过对中间接头的定位仿真，分析比较4种窗函数的WFT算法对接头的识别定位效果。最后，对实验室500 m长的10 kV交联聚乙烯电缆（cross-linked polyethylene，XLPE）进行测试来检验所提方法的测试效果。仿真和实验结果表明：相比于Hamming窗、Blackman窗、四项三阶Nuttall窗，二阶Nuttall自卷积窗抑制频谱泄露和栅栏效应的效果最佳，能更高灵敏度地识别和定位中间接头，且定位误差小于0.024%。

关键词: 配电电缆, 接头定位, 频谱分析, WFT, Nuttall自卷积窗

Abstract: In order to solve the problem of spectrum leakage and fence effect when using discrete Fourier transform (DFT) to analyze the input impedance spectrum of header point of cable, this paper presents an improved method of the joints location for the 10kV distribution cable based on Nuttall self-convolution window. First, the principle of the proposed method was briefly explained in this paper, including transmission line model for the power cable with an intermediate joint, input impedance spectrum of the cable, the locating principle of joints, and the windowed Fourier transform (WFT). Next, the window functions, i.e. Hamming window, Blackman window, four-iterm and third-order of Nuttall window, second-order of Nuttall self-convolution window, were selected to analyze their characteristics in detail. Then, through the simulation, the effects of the WFT algorithm with four window functions were analyzed and compared for the middle joint location. Finally, a 500 m long 10 kV cross-linked polyethylene (XLPE) cable was tested to verify the test results in the laboratory. The results indicated that compared with Hamming window, Blackman window and the four-iterm and third-order Nuttall window, the second-order of Nuttall self-convolution window had the best effect of suppressing spectrum leakage and fence effect. Besides, the proposed location method can identify and locate joints with higher sensitivity. The positioning error was less than 0.024%.

Key words: distribution cable, joint location, spectrum analysis, WFT, Nuttall self-convolution window

徐兴全, 桂媛, 姚玉海, 王智晖, 李蓉, 周凯, 谢敏. 基于Nuttall自卷积窗的10 kV配电电缆中间接头定位改进方法[J]. 中国电力, 2021, 54(4): 26-32.

XU Xingquan, GUI Yuan, YAO Yuhai, WANG Zhihui, LI Rong, ZHOU Kai, XIE Min. An Improved Location Method of 10 kV Cable Joints Based on Nuttall Self-Convolution Window[J]. Electric Power, 2021, 54(4): 26-32.

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基于Nuttall自卷积窗的10 kV配电电缆中间接头定位改进方法

An Improved Location Method of 10 kV Cable Joints Based on Nuttall Self-Convolution Window

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An Improved Location Method of 10 kV Cable Joints Based on Nuttall Self-Convolution Window

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