【摘要】 对直流系统常用的几种接地电阻测试方法进行了比较分析,指出了它们在使用中的缺点。研制了一种新的直流系统接地电阻检测仪,集检测、显示、记录于一体。该仪器以MCS-51单片机为控制核心,以CPLD为辅助控制单元,采用乒乓式变电桥测量法,实现了接地电阻的准确在线测量。着重介绍了仪器的工作原理以及软硬件设计。该仪器具有测量精度高、抗干扰能力强、人机界面友好以及成本低等优点。更多还原

【Abstract】 After comparing and analyzing several conventional insulating resistance measuring methods,their shortcomings are pointed out. A new kind of insulating resistance measuring instrument in DC system is presented,integrating of the functions resestance measuring,displaying and recording.The instrument takes MSC51 as kernel and CPLD as accessorial controlling unit,adopts Ping-Pong variable bridge method,and accomplishes online measuring insulating resistance exactly.Its principle,hardware and software design are introduced in detail.The practical operation shows that the instrument has the advantages of high precision,better anti-interference and low price.更多还原