Moisture Location of 10kV Cable Joints in Medium Voltage Distribution Grid Based on Frequency Domain Reflection

被引：0
|
作者：
Li R. [1 ]
Zhou K. [1 ]
Wan H. [1 ]
Xie M. [2 ]
Liu L. [1 ]
Wang X. [1 ]
Ma X. [3 ]
机构：
[1] School of Electrical Engineering, Sichuan University, Chengdu
[2] State Grid Wuxi Power Supply Company, Wuxi
[3] Jiangbei Power Supply Bureau of State Grid Chongqing Power Grid Company, Jiangbei District, Chongqing
来源：
Dianwang Jishu/Power System Technology | 2021年 / 45卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Blackman window; Distribution cable; Frequency domain reflection; Intermediate joint location; Moisture diagnosis;
D O I：
10.13335/j.1000-3673.pst.2019.1948
中图分类号：
O1 [数学];
学科分类号：
0701 ; 070101 ;
摘要：
In order to solve the shortcomings of moisture location for intermediate joints in distribution cables at present, this paper presents a new method for locating and diagnosing dampness of the joints in distribution cables based on frequency domain reflectometry (FDR). Firstly, the basic principle of the proposed method was clarified, with the frequency domain reflection theory, the cable impedance discontinuity point positioning principle and the Blackman window function. Then, the reason of the change for the cable capacitance before and after being damped was analyzed. Through the analysis of simulation and experiment, the variation rule of the electrical parameters for those joints was obtained before and after damp. After that, the Blackman window function was selected to eliminate the error caused by spectral leakage in the intermediate joint positioning spectrum. Next, the windowed diagnostic function Kblackman(x) was used to simulate and analyze the intermediate joints with different damp degrees.Finally, in the laboratory, 10 kV XLPE cables with different joint defects were produced to simulate its normal, mild and severe moisture conditions. The effectiveness of the proposed method was verified via the experimental tests and the data analysis. The results indicate that this method can locate and diagnose the intermediate joints with different moisture levels. © 2021, Power System Technology Press. All right reserved.
引用
收藏
页码：825 / 832
页数：7
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