摘要
介绍了采用双线圈感应法进行非接触式电力变电站设备接地电阻测量的原理,设计了基于DSP的接地电阻测量方案,分析了测量系统的主要干扰源及其特性。针对这些问题,在系统方案设计方面提出了相应的措施,并基于离散Fourier变换,从数字信号处理角度给出了特定频率信号提取和干扰抑制的解决办法。原理样机的测试结果验证了设计方案的正确性和有效性。
The primary principle of using two inductive coils to measure the grounding resistance of devices in power substation is introduced firstly in this paper, and a DSP based hardware scheme is presented. The main disturbance sources and their property are analyzed. In order to solve these problems and obtain accurate result, special design is considered in system scheme, and discrete Fourier transform based digital signal processing technology is employed to extract the signal with particular frequency and attenuate external disturbance. The experimental results of prototype validate the correctness and efficiency of the proposed design scheme.
出处
《电测与仪表》
北大核心
2009年第5期24-27,共4页
Electrical Measurement & Instrumentation
关键词
接地电阻
信号检测
数字信号处理
变电站
grounding resistance, signal detect, digital signal processing, power substation
