考虑金属护层结构的电力电缆单端故障识别方法  

Single-ended fault identification method of cables considered the sheath structure

作　　者：孙建明[1] 唐进[2] 

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]西南交通大学电气工程学院,四川成都610031

出　　处：《电力科学与技术学报》2017年第4期96-101,共6页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金项目(51307145)

摘　　要：基于一种考虑电缆金属护层结构的双π模型,推导故障支路的电压、电流与首端电气量的关系,利用电缆首端的故障分量信息,求取故障位置处的导芯与护层间、护层与地之间的阻抗值,根据阻抗值大小确定故障类型,有效解决电缆常见绝缘故障以及单相接地故障的识别问题。该方法仅利用首端电气量便能够对与金属护层相关的故障进行识别,不受故障电阻、故障距离和故障类型的影响。该文使用PSCAD/EMTDC进行仿真,使用MATLAB进行建模计算,结果验证了该方法的正确性与有效性。Based on the double π model which considers the cable metal sheath, the relationship between voltage and current of fault branch and the electric components at the beginning of the cable was derived. Based on the electric components at the beginning of the cable, the impedance between cable core and metal sheath, the metal sheath and earth can be calculated. And then the fault type can be determined, the insulation fault and single-phase grounding fault can be identified validly. The proposed method can realize the identification of fault type by using the electric components at the beginning of the cable, which is not effected by the fault resistance, fault distance, fault type. A number of simulations verify the effectiveness and validity of the proposed method under different fault scenarios

关 键 词：电缆结构 故障识别 单端法 

分 类 号：TM77[电气工程—电力系统及自动化]