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Several of the conventional ground resistance measurement methods such as AC method, DC leakage method etc. and their shortages are discussed. A new kind of ground resistance detector in DC system is presented. The detector, with C8051F041 as kernel, adopts measurement method basing on different frequency signals. The proposed method can reduce impact of branch distributing capacitor on ground fault...
As the backup power supply of DC system when AC power failure occurs, the residual capacity of battery effected safe operation of DC system directly. It is of great realistic significance to realize on-line measurement for the residual capacity of battery. To overcome the shortcomings of traditional measurement methods such as density method, opening voltage method, DC discharge method and so on,...
A new kind of fault recorder is presented to overcome the shortcomings of existing fault recorders in power system, such as unreasonable structure design, low communication speed, small data storage capacity, low reliability and so on. The recorder, with MC68332 as kernel, adopts high speed synchro-sampling and computer network communication techniques. The network communication based on TCP/IP between...
A new multi-purpose study state recorder of student for road sense is introduced. The correlative and important driving data of every student can be monitored in real time and then be saved into respective CF card The recorded data can be uploaded to upper computer through universal card reader for full driving course recurring and coach work evaluating. The recorder, based on fingerprint identification,...
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