Core asymmetry influence on transmission line parameters of three‐core power cables

IET Science, Measurement & Technology

Paul Wagenaars¹  Peter A. A. F. Wouters²  Yunpeng Liu³  Yan Li³  Tao Zhao³  Zhuoran Song⁴ 

[1] DNV GL – Energy Arnhem AR The Netherlands;Department of Electrical Engineering Eindhoven University of Technology The Netherlands;School of Electrical and Electronic Engineering North China Electric Power University Baoding China;State Grid Liaoning Electric Power Company Limited Shenyang China;

关键词: cable insulation;    finite element analysis;    modal analysis;    transmission line theory;   

DOI  :  10.1049/smt2.12047

来源: DOAJ

【 摘 要 】

Abstract Time‐domain reflectometry applied for power cable diagnostics employs transmission line parameters to determine signal shape and delay. This paper proposes to utilize pulse reflection measurement to evaluate the symmetry of a three‐core power cable as part of production quality assessment. For a rotation‐symmetric three‐core power cable, transmission line parameters can be obtained analytically, and with modal analysis propagation channels can be decoupled. Asymmetry caused by inaccurate core positioning complicates the decoupling process. This paper utilizes the “field‐circuit” approach for the analysis. The finite element method is used to obtain the electromagnetic field distribution for two types of asymmetry introduced in a cable design. Modal analysis results are validated by considering asymmetry as a perturbation of the symmetric cable design. The influence of asymmetry on the time‐domain pulse response is simulated. Deviation from a symmetric configuration is observable, in particular in terms of propagation velocity, which can be employed to assess cable manufacturing accuracy.

【 授权许可】

Unknown