摘要
架空输电线缆舞动是威胁电力系统输电线路安全运行的重要因素之一,对线路舞动情况进行实时监测很有必要。提出一种抗电磁干扰及其他恶劣环境的长距离输电线缆舞动分布式在线监测系统及其舞动参数测量方法,利用光时域反射仪(OTDR)实现架空输电线缆风舞分布式在线监测,根据光缆内散射信号沿空间分布的偏振态变化情况分析得到架空线缆实时的风舞状况。检测到线缆风舞事件并定位后,通过对风舞信号进行频谱分析和包络拟合的方法实现舞动频率、摆幅的定量测量。现场测试验证了线缆舞动频率和摆幅测量方法的有效性,在电缆13km和33km处先后监测到4次风舞事件,频率分别为0.42Hz、0.38Hz、1.13Hz和2.54Hz,幅度级别分别为Ⅳ、Ⅲ、Ⅰ、Ⅲ。结果表明该系统能准确实现线缆风舞频率和摆幅定量测量。
Overhead power transmission cable galloping is a great threat, thus on-line galloping monitoring is necessary and important to ensure the safety of the power systems. A novel distributed optical fiher sens- ing system is proposed and quantative measurement method for several key parameters is addressed, which is especially suiTab, for this application with strong electromagnetic interference and harsh environments. The proposed system is based on the Optical Time Domain Reflectometer （ OTDR ） technology, where the polarized state distributed along the cable of backscattering Rayleigh light is obtained to check if it is chan- ging with the perturbation of the wind. When a galloping event is detected and located, its frequency and amplitude can be quantatively measured by spectrum analysis and profile fitting of the galloping signals.The validity of quantative measurement algorithm is demonstrated by field tests. In the tests, 4 galloping events were detected at 13 km and 33 kin, and the wave frequency was respectively 0.42 Hz,0.38 Hz,1.13 Hz and 2.54 Hz, the amplitude levels were IV, III, I, III. The results show its feasibility and effectiveness of the accurate measurement of galloping frequency and amplitude.
出处
《电力学报》
2017年第1期49-56,共8页
Journal of Electric Power
基金
国家自然科学基金(61301275)
国家自然科学基金重大项目(61290312)
国家自然科学基金重大仪器专项(41527805)
光纤传感与通信创新团队(PCSIRT
IRT1218)
111引智计划项目(B14039)
关键词
分布式光纤传感器
光时域反射计
输电线缆风舞监测
频率测量
摆幅测量
distributed optical fiber sensors
OTDR
power transmission cable galloping monitoring
fre- quency measurements amplitude measurement
