Research And Development Of DC Monitoring System Based On Industry Personal Computer

In order to improve the reliability and automation of DC system in transformer station, the thesis analysis the lacks of actual DC system and designs the DC monitoring system based on industry personal computer according to DCS. it is consist of the measure units and monitoring computer. It can monitor and control the units and find the faults in DC system field. By internet the monitoring system can communicate whit the main control system of transformer station.The thesis researches and designs the general structure of DC system, analysis the basic structure.connection mode and the selection of accumulator and charger of DC system and DC monitoring system.Because of the superiorities of wavelet in time and frequency,the thesis imposes B spline wavelet and morlet complex wavelet to analysis the signal of insulation branchs based on Low frequency signal injection method.therefore we can calculate the value of grounding resistance.The accumulator is the important part of DC system.The thesis analysis its characters and charging modes,research the methods of charging management and forecasting capability.The thesis designs the units of accumulator to adopt its volage, current and actual temperature for better monitoring.The equipments of DC system are differ from the different transformer station.and the monitoring and controlling are alse different.therefore, the monitoring computer needs to fulfill the system's configuration according to the different DC systems.the thesis uses the programming ideal of industry configuration software to design the monitoring software of DC system.it detailedly analysis the course of the software designing of graph system,real database and communication and introduces the designing according to the actual DC system. The technique of multithreading is applied to attain credible communication.