罗氏线圈检测励磁变压器中脉冲干扰信号仿真试验研究  

Simulation and Experiment of Pulse Interference Signals in Excitation Transformer Detected by Rogowski Coil

作　　者：江天炎[1] 陈曦[1] 毕茂强[1] 

机构地区：[1]重庆理工大学电气与电子工程学院,重庆400054

出　　处：《重庆理工大学学报（自然科学）》2017年第6期154-159,共6页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51507017);重庆市能源互联网工程技术研究中心专项

摘　　要：励磁变压器的安全运行是发电机组系统稳定运行的前提,其低压绕组由于运行工况恶劣,绕组绝缘极易发生局部缺陷。局部放电在线监测是检测其绝缘缺陷的有效方法,但极易受到外部脉冲信号干扰。对罗氏线圈检测励磁变压器中脉冲干扰信号进行了仿真试验研究,首先分析了励磁变压器低压绕组承受的电压波形,阐述了其绝缘发生劣化的过程,并提出了励磁变压器局部放电在线监测方法。针对励磁变压器局部放电在线监测系统的安装位置,采用EMTP软件建立了罗氏线圈检测励磁变压器中干扰脉冲信号的仿真模型,分析了其采集的外部干扰脉冲信号的波形特征,最后在现场对外部干扰信号进行了模拟试验验证。结果表明:提出的仿真模型与现场试验基本吻合,为励磁变压器局部放电信号的去噪及故障诊断奠定了一定的基础。The safe operation of excitation transformer is the premise of stable operation of power system. However, the working conditions of low-voltage winding are bad, and the partial discharge defects are extremely easy to occur in the winding insulation. Partial discharge online monitoring is an effective approach but easily affected by external pulse signal interference. This paper presented the simulation experiment of pulse interference signal in excitation transformer detected by the Rogowski coil sensor. Firstly, voltage over the low voltage winding of the excitation transformer was displayed. The degradation process of the insulation and the partial discharge （PD） online monitoring method were described. Electrical circuit was established by the EMTP software, which was simulated pulse interference signal propagation in the excitation transformer. Waveform characteristics of the pulse interference signal detected by the Rogowski coil was given. Results show that simulation model was right and benefited to fault diagnosis of PD signals in the excitation transformer.

关 键 词：励磁变压器 局部放电 脉冲干扰信号 罗氏线圈 故障诊断 

分 类 号：TM412[电气工程—电器]