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

doi:10.11930/j.issn.1004-9649.202006152

Abstract

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

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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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202006152

https://www.electricpower.com.cn/EN/Y2021/V54/I4/26

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