Impedance Matching Technology for Frequency Domain Reflectometry and Its Application in Cable Attenuation Compensation and Phase Velocity Calculation

被引：0
|
作者：
Xie M. [1 ]
Li Y. [1 ]
Yu J. [1 ]
Qian L. [1 ]
Yang D. [1 ]
Sun Q. [1 ]
Zhou K. [2 ]
机构：
[1] State Grid Wuxi Power Supply Company, Jiangsu Province, Wuxi
[2] School of Electrical Engineering, Sichuan University, Sichuan Province, Chengdu
来源：
Dianwang Jishu/Power System Technology | 2024年 / 48卷 / 04期
基金：
中国国家自然科学基金;
关键词：
attenuation compensation; cable; frequency domain reflectometry; impedance matching; phase velocity calculation;
D O I：
10.13335/j.1000-3673.pst.2023.0282
中图分类号：
学科分类号：
摘要：
Frequency domain reflectometry (FDR) is an effective method for the cable insulation condition diagnosis. Focusing on the problem of the impedance mismatching in the field FDR detection, this paper presents an effective FDR impedance matching technology. By introducing the variable series impedance model, combined with the estimated characteristic impedance, the influence of the bifurcated leads on the field FDR test results is effectively removed. Firstly, the cable model was established, and by the use of the principle of multiple refraction and reflection of the traveling waves, the reflection coefficient at the head of cable was deduced, which explained the signal transmission process in the cable. Then, this paper presented an impedance matching method at the head of the cable when the bifurcated lead was existed. Finally, the impedance matching tests were performed on the coaxial cable and the 10 kV power cable, and the validity and accuracy of the method in this paper were verified. The results show that the proposed method is able to effectively solve the problem of impedance mismatching at the head of the cable in the field FDR detection. By using the matched data, the attenuation of the cable is able to be compensated effectively, and the phase velocity of cable be calculated accurately. © 2024 Power System Technology Press. All rights reserved.
引用
收藏
页码：1762 / 1769
页数：7
相关论文
共 23 条
  • [1] Lulu LI, Jing YONG, XU W．, On-line cable condition monitoring using natural power disturbances[J], IEEE Transactions on Power Delivery, 34, 4, pp. 1242-1250, (2019)
  • [2] PENG Nan, ZHANG Peng, LIANG Rui, Fault sensing and location of the three-core armored cables in distribution network based on the analysis of the fault-featured transient moduli[J], Proceedings of the CSEE, 41, 16, pp. 5767-5778, (2021)
  • [3] WANG Yuhao, ZHOU Kai, WANG Xianjin, Power cable defects location based on improved time-frequency domain reflectometry[J], Proceedings of the CSEE, 41, 7, pp. 2584-2593, (2021)
  • [4] Haoqian WU, Study on location of middle voltage cable joints based on time domain reflectometry
  • [5] Min XIE, ZHOU Kai, ZHAO Shilin, A new location method of local defects in power cables based on reflection coefficient spectrum[J], Power System Technology, 41, 9, pp. 3083-3089, (2017)
  • [6] REN Zhigang, ZHAO Xueqian, GUO Wei, Detecting method of cable with water seepage defect based on time domain reflection technology[J], Insulating Materials, 55, 1, pp. 80-86, (2022)
  • [7] SONG E, SHIN Y J, STONE P E, Detection and location of multiple wiring faults via time-frequency-domain reflectometry[J], IEEE Transactions on Electromagnetic Compatibility, 51, 1, pp. 131-138, (2009)
  • [8] LI Rong, ZHOU Kai, WAN Hang, Moisture location of 10kV cable joints in medium voltage distribution grid based on frequency domain reflection[J], Power System Technology, 45, 2, pp. 825-832, (2021)
  • [9] HIRAI N, YAMADA T, OHKI Y．, Comparison of broadband impedance spectroscopy and time domain reflectometry for locating cable degradation[C], 2012 IEEE International Conference on Condition Monitoring and Diagnosis, (2012)
  • [10] OHKI Y，, YAMADA T, HIRAI N．, Precise location of the excessive temperature points in polymer insulated cables[J], IEEE Transactions on Dielectrics and Electrical Insulation, 20, 6, pp. 2099-2106, (2013)
123