摘要
根据短距法测量接地电阻的原理,采用单片机设计一个具有GPRS功能的接地电阻自动检测系统,以解决接地电阻自动检测及其测量数据的远距离传输问题。系统下位机主要由DDS电流源产生模块、A/D转换模块、GPRS模块、人机交互模块等构成。通过异频法选取检测信号频率,消除了地网工频干扰。上位机采用Delphi设计了上位机数据管理系统。系统具有接地电阻的远程自动测量和控制功能,并利用季节系数对接地电阻进行修正,避免了人工测量所带来的误差。
Based on the principle of a short-distance method for measuring grounding resistance, an automatic test system for grounding resistance based on GPRS is designed by use of single-chip microcomputer in order to solve the problems of automatic detecting grounding resistance and long distance data transmission. System lower computer is composed mainly of DDS current source production module, A/D conversion module, GPRS module and man-machine interaction module. The mechanical power frequency interference is eliminated by means of non-power frequency method to select detection signal. The computer data management system is designed based on Delphi. This system possesses functions of remote automatic measurement and control for grounding resistance that is corrected by seasonal coefficient. In this way, the error brought by the manual measurement is avoided.
出处
《气象水文海洋仪器》
2011年第4期57-61,64,共6页
Meteorological,Hydrological and Marine Instruments
基金
江苏省"六大人才高峰"项目资助
江苏省科技创新与成果转化专项(BE2008139)资助
江苏省传感网与现代气象装备优势学科平台资助
关键词
接地电阻
短距法
异频法
GPRS
季节系数
grounding resistance
short-distance method
non-power frequency method
GPRS
seasonal coefficient
