摘要
针对智能变电站的光纤通信延时测量问题,对智能变电站中OTDR的工作原理和光源器件进行了研究,分析了激光脉冲频率和脉宽对系统性能的影响。根据激光二极管的发光机理与特点设计出了一套基于STM32控制单元的适合智能变电站中OTDR工作的激光驱动电路,重点分析了驱动电路中的调制电流,考虑了驱动电路对激光器的保护,并利用所设计的激光驱动电路搭建了简易OTDR观察光纤的损耗特性。研究结果表明,该电路可扩大激光脉冲频率和脉宽的调整范围,实现激光脉冲宽度最小可达300 ns,脉冲频率最大为50 KHz,激光发射功率为3 MW;通过实验,验证了光在光纤中的衰减特性,证实了该电路能满足实际智能变电站中OTDR工作所需,具有一定的参考价值。
Aiming at the problem of optical fiber communication delay measurement in smart substation,the working principle of OTDR and the light source device were studied. The influence of laser pulse frequency and pulse width on the system performance was analyzed. According to the laser diode luminescence mechanism and characteristics,a set control unit based on STM32 for intelligent substation in OTDR work of laser driver circuit was desighed,focusing on analysis of the modulation current driving circuit,taking into account the driving circuit of laser protection,and the design of laser driving circuit to build simple OTDR fiber loss characteristics were observed. The research results show that the circuit can expand the adjustment range of laser pulse frequency and pulse width,achieve the minimum laser pulse width up to300 ns,the maximum pulse frequency up to 50 k Hz,the laser power up to 3 m W. Through the experiment,the attenuation characteristic of the optical fiber is verified,and it is proved that the circuit can meet the requirements of the OTDR in the actual intelligent substation,and it has a certain reference value.
作者
张灵芝
ZHANG Ling-zhi(Department of Electronic and Electrical, Hunan Vocational College of Railway Technology, Zhuzhou 412000, China)
出处
《机电工程》
CAS
2016年第10期1268-1271,共4页
Journal of Mechanical & Electrical Engineering
基金
湖南省教育厅科学研究项目(14C0759)
