基于STM32F407的高压输电线电磁检测系统设计

Design of Electromagnetic Testing System for Power Transmission Line Based on STM32F407

摘要:

针对输电线的结构特点,采用涡流检测与漏磁检测相结合的电磁检测方法,设计了一套以高速ARM微控制器STM32F407VG为控制核心器件的高压输电线电磁检测系统;介绍了系统采用直接数字频率合成DDS技术的涡流激励信号产生模块、采用锁相放大技术的涡流信号提取模块、采用差动测量技术的漏磁检测模块、A/D模数转换模块等;上位机程序采用LabVIEW虚拟仪器设计,并通过USB总线与系统进行实时通信;整个系统具有实时性强、易于集成和重构的特点;最后利用设计的电磁检测系统对输电线接头处钢芯拉开缺陷和铝绞线中的断股损伤分别进行了漏磁和涡流检测,结果验证了检测的可靠性和实用性。

Abstract:

Taking into account the structural characteristic of the high voltage overhead transmission line,an electromagnetic testing system based on the high speed ARM microprocessor STM32F407 is designed in this paper,which combines with eddy current testing and leakage magnetic flux testing systems. In the paper we introduced the Direct Digital Synthesis (DDS) based eddy current excitation signals generator module,eddy current signals extraction module which was realized by lock-in amplifier,leakage magnetic detection module which employed differential measurement technique,and A/D conversion module etc. In addition we also designed the host computer programs with LabVIEW,and it communicated with the system via the USB bus. The whole system possesses advantages such as strong real-time,easy to integration and remodeling. The validity of the proposed system is proved by a real detection process,which is implemented to find out the defects in butt joint and aluminum strands on power transmission line.