基于高次谐波的隧道电缆实时检测系统研究

High-order-harmonic-based Real-time Detection System of Tunnel Cables

针对城市隧道电缆长期使用过程中会出现各种故障的问题,设计实时检测隧道电缆运行状态的系统。设备采用定点安装的方式,定时采集所检测隧道电缆的高次谐波,通过小波分析将各次谐波进行分解重组,最终得出各次谐波特征值(谐波含有量)。将处理后的数据输入专家数据库进行对比以判断电缆是否发生故障并得出其健康指数。定时采集得出的数据会被存储,供管理人员查看与了解电缆运行状态以及时排除安全隐患。该系统有助于保障城市用电安全,减少因电缆故障造成的城市断电事件以及安全事故的发生。

Urban tunnel cables inevitably encounter various faults during long-term services.In view of this,the present work designed a real-time detection system for operation status of tunnel cables.The system employs immobily-installed equipment to regularly collect cables′high-order harmonics which are then decomposed and reorganized through wavelet analysis,acquiring characteristic values of each order of harmonics(harmonic content).The processed data are subsequently transmitted into expert database for comparison,so as to determine whether the cable has a fault and to obtain the cable′s health index.The real-time collected data will be stored,and management personnel can ascertain cables′operation status by viewing the stored data,facilitating timely elimination of potential safety hazards.The designed system may help in guaranteeing safety of urban electricity consumption,and reducing urban electric outages and cable-failure-induced safety accidents.