Power Users Comprehensive Centralized Meter Reading System

The paper introduces the big electricity user reading system of based on GPRS. GPRS is a transition from GSM to CDMA. There is a direct connection between GPRS network and Internet. GPRS has some advantages such as real-time on line, charging on flow and high speed transmitting.This system is made up of four parts: data gathering, data communication, data processing analysis and control. This system makes use of several means ,such as the SMS of GPRS network, voice channel ,etc. to realize the " four distant" function of the power system. This system can accept and record the phase voltage, electric current, active power, reactive power, power factor, the time of voltage exceeding the limit, net loss statistic of the locale equipment. It can also inspect and control the switch, alarm the exceeded voltage and electric current, calculate the net loss. This article mainly introduces the composition of the monitoring system, GPRS communication module, communication DLL (dynamic link library) of backstage supporter interface and GPRS backstage supporter software of monitoring system.The adopted protocol of the system is a combined protocol of power meter and the wei sheng protocol and supplement protocol that self-defined, The host computer GPRS communication module can employ TCS model or MC35 model or other models. The DBMS (database management system) adopts Oracle & MS SQL Server. It has the interface of SQL, The historical database can be visited by some kind of tools such as Excel, Foxpro directly with ODBC (Open database is joined). Backstage supporter's management software is designed on Windows software platform. It uses the distributed structure of Client/Server. Backstage supporter management software transfers the function of DLL (dynamic link library) to finish various kinds of data gather and control the function. It also has other functions such as authority management, data inquiry, curve drawing, typing the report and so on.With the development of automatic technology, computer technology and IT technology, the cost will be lower; the communication will be more reliable by the use of GPRS public network to carrying on remote data transmission, The big electricity user reading system Swill have a more widely applications.