气象水文海洋仪器
氣象水文海洋儀器
기상수문해양의기
METEOROLOGICAL,HYDROLOGICAL AND MARINE INSTRUMENTS
2011年
4期
57-61,64
,共6页
接地电阻%短距法%异频法%GPRS%季节系数
接地電阻%短距法%異頻法%GPRS%季節繫數
접지전조%단거법%이빈법%GPRS%계절계수
grounding resistance%short-distance method%non-power frequency method%GPRS%seasonal coefficient
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。
根據短距法測量接地電阻的原理,採用單片機設計一箇具有GPRS功能的接地電阻自動檢測繫統,以解決接地電阻自動檢測及其測量數據的遠距離傳輸問題。繫統下位機主要由DDS電流源產生模塊、A/D轉換模塊、GPRS模塊、人機交互模塊等構成。通過異頻法選取檢測信號頻率,消除瞭地網工頻榦擾。上位機採用Delphi設計瞭上位機數據管理繫統。繫統具有接地電阻的遠程自動測量和控製功能,併利用季節繫數對接地電阻進行脩正,避免瞭人工測量所帶來的誤差。
근거단거법측량접지전조적원리,채용단편궤설계일개구유GPRS공능적접지전조자동검측계통,이해결접지전조자동검측급기측량수거적원거리전수문제。계통하위궤주요유DDS전류원산생모괴、A/D전환모괴、GPRS모괴、인궤교호모괴등구성。통과이빈법선취검측신호빈솔,소제료지망공빈간우。상위궤채용Delphi설계료상위궤수거관리계통。계통구유접지전조적원정자동측량화공제공능,병이용계절계수대접지전조진행수정,피면료인공측량소대래적오차。
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.
