Application Of GPRS For Distribution Automation System

Distribution automation is to utilize modern electronic technology,communication, computer to combine with network technology and electricapparatus, distribution network monitoring, protection, control, measure and supplypower working management of department merge together organic in case of normaland accident, improve power supply quality, establish responsible relation more withuser, meet user variety of requirement at rational price, strive to make and supplypower economy best, business administration is more effective. The communicationnetwork is essential as an automatic component of distribution, its stability, anddependability involve directly whether the automated system of the distributioncould run normally. Communication way and network structure adopted are decidedby characteristic and requiring with automatic distribution in the communicationnetwork.. The characteristic of automated system communication of the existingdistribution is as follows, 1, the terminal nodal quantity is large. 2nd, the distance ofcommunication is short. 3rd, communication data amount are few. So build andpropose the following requirement to the communication network of distribution:higher operation dependability;lower construction investment;stronger expansion;the real-time character of communication;two-way communication capacity;losingelectrical power and communication capacity of hour of trouble. This thesis indiscuss power system have various communication pluses and minuses andapplicable scope of way now fully. Include mixing the carrier communication of electric wire (PLC), worker'scontrol technology, telephone wire, on-the-spot bus and RS-485, pass way,frequency modulation, amplitude modulation broadcasting and microwavecommunication of cable TV (CATV), etc. frequently. And then propose using GPRSto realize a link in distribution automation -distribution voltage transformermonitoring system. Have explained four components of this system in detail. Mainwebsite of the control center, acting server of the network, GPRS are terminal indata transmission and controlling the terminal device. Every part of main functionsis: The main website mainly finishes the work of human-computer interaction;Network acting server responsible for network data chain set up and whom datareceive and dispatch transparent to change trains mainly;GPRS data transmission isterminal to finish being issued on information;Control the collection that theterminal device mainly finished figure amount and analog quantity. Carry on every function and real-time test of performance through methodcapital equipment GPRS IP Modem in design of experiment. And has madeomni-directional comparison according to test result and other communication ways,receive the technological advantage of GPRS, mainly showing in the followingaspects:(1) Resources utilization ratios are high. GPRS introduce transmission modeexchanged to divide into groups among GSM network, make, adopt circuit GSM toexchange mode transmit datum way change fundamentally originally;this seemsparticularly important in a situation that wireless resources are rare.(2) The transfer rate is high. GPRS can offer the transmission peak value of171.2Kbps (including FEC), the speed of the net data can reach 115Kbps. GPRSuser can surf the Net fast as ISDN or ADSL user, make some employ, becomepossible to transfer rate sensitive movement multimedia at the same time;(3) Insert time short. Dividing into groups exchanges and inserts time and isless than for one second, can offer the fast connection immediately, can improvesome efficiency employed (such as controlling long-rangly) by a large margin, makeexisting Internet employ (for instance E-mail, the web page is had a look around)more convenient and more smooth;(4) Support IP agreement and X.25 agreement. GPRS supports to employ themost extensive IP agreement and X.25 agreement on Internet. More and moreenterprises regard Internet as the staff member and visit the media of the networkIntranet inside enterprises, so support IP agreement to seem particularly important.Exist a large number of grouping data network, support X.25 agreement can enableX.25 that has exist already employ, can go on, use at GSM network. And becauseGSM network coverage rate is wide, GPRS can offer Internet and other groupingnetworks with worldwide wirelessly insertion.The conclusion must happen finally: The system based on that GPRScommunicates is that one relatively has a realization scheme of employing theprospect.