摘要
为解决建筑物接地电阻检测中存在的精度低,智能化低,效率低等问题,提出了一种基于STM32的建筑物接地电阻检测方案;系统采用三极补偿原理,通过C#编程实现人机接口,完成了对现场数据的检测、录入及分析;系统的检测模块主要由交流合成、信号采集和数据处理三部分组成,由STM32控制产生频率精度高、波形稳定的交流电流注入地网,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处理获得精确的接地电阻值;实验结果表明,检测精度由原来的0.92%提高到0.5%;该方案应用到建筑物接地电阻检测中可以明显提高检测精度和检测效率,实现检测工作的智能化,具有一定的应用价值。
In order to solve low precision, low intelligence and low efficiency in the presence of building ground resistance testing, anew method of building ground resistance detection based on STM32 was proposed. The system adopted three--pole compensation principle, pro grammlng through C ~ to reallze human interface to complete detection, recording and analysis of field data. The detection module contains of synthesizer of alternating current, signal collecting and data processing platform. The alternating current with high precision frequency and waveform stability produced by STM32 was poured into the grounding network. The signal of voltage and current in the grounding network were translated into a precise grounding resistance value through band--pass filter, differential amplify, synchronous AD conversion, FFT processing. Experimental results show that the detection accuracy increased from 0. 92 % to 0.5%. The program applied to building ground resistance testing can significantly improve the detection accuracy and detection efficiency, and realized the intelligent testing work. It has a certain application value.
出处
《计算机测量与控制》
2015年第10期3567-3569,共3页
Computer Measurement &Control
基金
质检总局科技计划项目(2013QK023)
