基于Dolph-Chebyshev窗的电力电缆中间接头定位诊断

Dolph-Chebyshev Window-Based Diagnosis for Locating Intermediate Joints in Power Cables

提出一种基于Dolph-Chebyshev窗的配电电缆中间接头定位改进方法。根据电缆传输线模型说明频域反射法(frequency domain reflectometry,FDR)的定位原理,建立定位仿真模型进行验证,通过仿真对比分析选择基于DolphChebyshev窗的FDR改进方法;同时搭建电缆总长为20 m、接头位置为10 m的中间接头冷热循环受潮平台,探究其受潮发展规律;建立多接头仿真模型,探究接头在不同缺陷程度时的定位幅值关系。结合诊断模型,在2800 m多接头10 kV XLPE电缆上进行验证。仿真及实验结果表明:所提方法能够准确定位各接头并有效识别出缺陷接头;验证了所提方法对电缆异常接头定位及诊断具有可行性。

This paper proposes an improved method for locating intermediate joints in distribution cables based on Dolph-Chebyshev window.Firstly,the positioning principle of frequency domain reflectometry(FDR)is described according to the cable transmission line model,and a positioning simulation model is established to verify the positioning,and the improved FDR method based on Dolph-Chebyshev window is selected through simulation and comparison analysis.Secondly,a cold and hot cyclic moisture platform is built for a total cable length of 20 m and a joint location of 10 m to investigate the moisture development pattern.A multi-joint simulation model is also built to explore the relationship between the positioning amplitude of the joints at different defect levels.Finally,in combination with the diagnostic model,the verification is carried out on a 2800 m of 10 kV XLPE cable of multi-joints,and each joint is accurately located and the defective joints are effectively identified.The simulation and experimental results show that the proposed method is feasible for locating and diagnosing abnormal cable joints.