【摘要】 采用罗柯夫斯基线圈(Rogowskicoil)和ARM+CPLD总线复用系统设计了输电线路故障暂态电流采集的新方法。详细讨论了罗柯夫斯基线圈在工频和高频情况下的工作模型及适用范围,在此基础上提出故障暂态电流采集动态阀值设定原则及电路实现。详细阐述了以ARM+CPLD的总线复用系统基础的高速数据采集方法、高速A/D转换与快速存储操作的协调控制关系,实现了故障暂态电流数据的高速采集存储和低速读取功能。结合实测数据,对所提故障暂态电流采集方法进行了分析。该方法可有效地降低暂态电流采集系统常态下的功耗及硬件实现的复杂性。更多还原

【Abstract】 This paper designs a new method of sampling the transient failure current based on Rogowskicoil and bus multiplexing system with ARM and CPLD.It discusses in detail the work model and applicable scope of Rogowskicoil in low and high frequency situation.On the basis of that,the setting principles of the threshold of transient failure current and circuit implementation are proposed.The high-speed data acquisition method based on the bus multiplexing system of ARM and CPLD,and the relationship between high-speed A/D conversion and fast access are represented in detail.Sampling and storaging the transient failure current in high speed and reading in low speed are realized.With the data acquired in field,the method of sampling the transient fault of the transmission line designed in this paper is analyzed.This method can reduce the power consumption of the transient failure current sampling system in normal condition and the complexity of hardware implementation effectively.更多还原