基于STM32的建筑物接地电阻检测仪的研制

Development of building ground resistance measuring instrument based on STM32

摘要:

针对目前建筑物接地电阻检测装置存在的缺陷,提出一种基于STM32的建筑物接地电阻检测的系统方案。该方案根据三极补偿原理,采用嵌入式系统控制的主从机软硬件实现接地电阻的精确测量。检测系统包括交流合成、信号采集和数据处理三部分。检测系统由STM32控制产生频率精度高、波形稳定的交流电流注入接地网,对地网中的电压电流信号经带通滤波、差分放大、同步AD转换、FFT处理得到精确地接地电阻值。本检测系统能够提高检测精度以及检测效率,实现检测工作的智能化。

Abstract:

According to the defect of the building ground resistance measuring device presently. A new system of building ground resistance detection which based on STM32 was proposed. This scheme was based on the principle of three-pole compensation method. The hardware and software of the master-slave machine which controlled by embedded system was applied to achieve accurate measurement of ground resistance. The detection system included synthesizer of alternating current, signal collecting and data processing platform. The detection system was consisted of a STM32 control which product alternating current with high precision frequency and waveform stability into the grounding network. The signal of voltage and current in the grounding grid were translated into a precise grounding resistance value through band-pass filter, differential amplify, synchronous AD conversion, FFT processing. The detection system could improve the detection accuracy and efficiency, and realize the intelligent testing work.