Research And Implementation Of Low Voltage Centralized Meter Reading Technology Of Intelligent Distribution Transformer Terminal

In the distribution network automation system,intelligent distribution terminal is a component of distribution network automation to meet the requirements necessary,it can work in real-time monitoring and analysis of distribution transformer,for the security of the distribution network,are of great significance to reliability and so on.With the rapid development of power line carrier communication mode,the communication in the intelligent distribution network has become more and more obvious advantages,it is a kind of physical strength,wide coverage,no wiring,special access cost less,being widely used.Due to the characteristics of the power line communication channel in the complex.In the process of data transmission,will have high error rate,low reliability of the phenomenon exists,therefore,this paper adopts OFDM technology based on G3-PLC standard,t is a global open protocol for smart grid.By adopting advanced channel coding technology and powerful error correcting coding mechanism,it can ensure the strong data communication in the power line channel.This paper outlines the development of power line communication,emphatically introduces the development status of narrowband power line communication,and the overall design of the intelligent distribution terminal.Secondly,this paper discusses the working principle and key technology of OFDM technology,G3-PLC standard protocol and frame structure are illustrated in detail.Then,with the help of the PLC development board and software the program of TI company from the point of view of the physical layer signal in complex power line communication performance in channel transmission,G3-PLC standard can be used in the intelligent distribution transformer terminal is provided.Finally,according to the DLT/645 Protocol,the intelligent allocation based on G3-PLC standard variable terminal centralized meter reading test.After a lot of tests show that the variable terminal automatic meter reading system with intelligent performance based on G3-PLC standard,has the characteristics of low error rate and high reliability,the measured data are consistent with the requirements,to achieve the desired results.