基于DSP的在线电容电流测量设备的开发

Development of On-line Measurement Device of Capacitance Current Based on DSP

  • 摘要: 针对现有电容电流测量设备存在安全隐患的问题,文章提出了一种基于DSP的在线电容电流测量设备的设计方案,介绍了该设备的测量原理、硬件和软件的设计。该设备采用信号注入法测量电网电容电流:由消弧线圈二次侧在线注入20~80 Hz、步长为0.2 Hz、幅度相等的信号,通过DSP处理电网的反馈信号得到电网系统的谐振频率,间接计算得到电网电容电流。该设备解决了电容电流测量的安全性问题。

     

    Abstract: In order to resolve the problem of hidden trouble about safety in existing capacitiance current measurement device,the paper put forward a design scheme of on-line measurement device of capacitance current based on DSP,introduced the measurement principle,design of hardware,and software of the device.The device uses the signal-injection method to measure capacitance current of power network which uses arc-suppression coil to on-line inject signal range from 20 Hz to 80 Hz with step 0.2 Hz and equal amplitude into secondary side of arc-suppression coil,uses DSP to process feedback signal to get resonate frequency of power network system,then indirectly gets capacitance current.The device solves the problem of safety of mesuring capacitiance current.

     

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