Identification and Location of Local Defects in Distribution Cables Based on Reflection Coefficient Spectrum
赵洪山 1郭潇镁 1马利波 1王艳1
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作者信息
1. 新能源电力系统国家重点实验室(华北电力大学),河北保定 071003
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摘要
传统配电电缆在局部缺陷识别与精准定位上灵敏度较差,位置范围识别受到限制,为解决现有技术在配电电缆缺陷诊断上存在的不足,提出一种基于反射系数谱的配电电缆局部缺陷识别定位方法.首先依据电缆分布参数模型,获得配电电缆完好状态与存在局部缺陷段的反射系数谱,然后利用广义正交积分法,将反射系数谱的虚部从频域转换到空间域,建立积分诊断图,得到具有直观性的定位图谱,根据积分诊断图实现配电电缆局部缺陷的识别与精准定位,方法适用于同时存在多处电缆缺陷的情况.最后,在实验室50 m长的配电电缆上制作老化与破损两种缺陷,用于验证所提方法的有效性.仿真和实验结果表明,该方法对不同缺陷情况均具有较高的识别精度,定位误差小于0.15 m.
Abstract
Traditional distribution cables have poor sensitivity in local defect identification and accurate location,and the location range identification is limited.In order to solve the shortcomings of the existing technology in distribution cable defect diagnosis,we proposed a method based on reflection coefficient spectrum for identifying and locating local defects in distribution cables.Firstly,according to the cable distribution parameter model,we obtained the reflection coefficient spectrum of the distribution cable in good condition and with local defects.Then,we used the generalized orthogonal integration method to convert the imaginary part of the reflection coefficient spectrum from the frequency do-main to the spatial domain,and established an integral diagnosis diagram to obtain an intuitive positioning map.Ac-cording to the integral diagnosis diagram,we realized the identification and accurate positioning of the local defects of the distribution cable.The method is suitable for the case of multiple cable defects at the same time.Finally,two kinds of defects,aging and damage,are made on the distribution cable with a length of 50 m in the laboratory to verify the ef-fectiveness of the proposed method.The simulation results show that this method has high recognition accuracy for dif-ferent defects,and the positioning error is less than 0.15 m.
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