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| 摘要: |
| 探讨了一种基于嵌入式系统新型接地网特性测量装置的开发方案,采用变频测量方法,能在30～70Hz频段间1Hz步进,选择最佳测量频率,避开工频环境中的干扰信号,实现接地网特性参数的准确测量。设计的测量装置由变频电源、测量处理模块、嵌入式控制核心组成,其中处理器采用ARM7TDMI内核的32位高速处理器。系统软件包括准同步采样、数字滤波、电参量计算等,由固化在嵌入式ARM芯片中的程序实现。方案充分利用嵌入式技术特点,通过传感器、A/D转换器等较少硬件,完成接地网参数的测量,应用结果证明设计方案高效、可靠,满足测量要求。 |
| 关键词: 交流变频测量,接地网,ARM,uCLinux,数字滤波器 |
| DOI： |
| 分类号:TM943 |
| 基金项目: |
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| Measurement instrument based on embedded system for grounding grid |
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FANG Yan-jun XI Bo
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| Abstract: |
| The development scheme of an instrument based on embedded system for measuring the characteristic parameters of grounding grid is discussed. To avoid the power frequency interference and realize exact measurement,it adopts AC variable-frequency method and searches the optimal measuring frequency from 30 to 70 Hz with 1 Hz step. It is composed of AC variable frequency power source,measurement processing module and 32-bit processor with embedded ARM7TDMI control core. The system software includes quasi-synchronous sampling,digital filtering and electric parameter calculation,burnt in the embedded ARM chip. The scheme makes full use of embedding technique,implementing the parameter measurement with less hardware of sensors and A / D converter. Appli-cations prove that the scheme is efficient and reliable,meeting the measurement requirements. |
| Key words: AC variable-frequency measurement,grounding grid,ARM,uCLinux,digital filter |
