I. Introduction With the development of science and technology, the automation of medium and low voltage distribution networks has become a trend in power system development. As the last link in the power transmission and distribution system, the degree of automation of medium and low voltage distribution networks is closely related to the quality and reliability of power supply and consumption. Therefore, this paper briefly discusses the necessity of automation of medium and low voltage distribution networks and its implementation schemes. Distribution transformers are power equipment that directly distributes electrical energy to low-voltage users, and their operating data is an important part of the basic data of the entire distribution network. Therefore, it is necessary to monitor their operating parameters and status. This paper discusses the use of GPRS as a communication means to establish a distribution transformer monitoring system. In the communication of the distribution transformer monitoring system, data radio, GSM short messages, fiber optic access, etc. can be used. The advantage of data radio is that, apart from the annual frequency fee, there are no additional operating costs during normal times; the disadvantage is that it is greatly affected by terrain and weather, resulting in poor system reliability and real-time performance, and it cannot actively report. GSM short messages can achieve active reporting; the disadvantage is that it is charged per message, the operating cost is high, and the delay is quite long when the short message center server is busy during holidays. Fiber optic communication is stable and reliable, but it suffers from high construction costs, poor scalability, and inconvenient equipment maintenance. GPRS communication avoids these problems. General Packet Radio Service (GPRS) is a new wireless data transmission service developed on the existing GSM system, aiming to provide mobile users with high-speed wireless IP or X.25 services. GPRS theoretically has a bandwidth of up to 171.2 Kbit/s, with practical application bandwidth ranging from approximately 40 to 100 Kbit/s. Providing TCP/IP connections on this channel allows for applications such as internet connectivity and data transmission. GPRS uses packet switching technology, allowing each user to simultaneously occupy multiple wireless channels, and the same wireless channel can be shared by multiple users, effectively utilizing resources. GPRS allows users to send and receive data in end-to-end packet transfer mode without utilizing circuit-switched network resources. GPRS is always online and billed based on data usage, thus providing an efficient and low-cost wireless packet data service. It is particularly suitable for intermittent, bursty, and frequent data transmissions with multiple dispersed points and small to medium traffic volumes, and also for occasional large data transmissions. II. System Structure The development goal of the distribution transformer integrated management system is to establish a secure and reliable system that provides various advanced services and has a robust open platform for application execution and implementation. This platform comprises multiple relatively independent application subsystems running on it, creating a distributed, open, modular, and scalable integrated management system for distribution transformers that meets the requirements of modern distribution system management. The basic platform provides fundamental hardware technology and an operating system kernel, as well as basic services such as database systems, information transmission, human-machine interfaces, and real-time environment applications. The application subsystems built upon this platform include: distribution transformer management, line loss management, automatic meter reading, VQC functionality, harmonic data, electricity purchase management, data query, automatic reports, charts, and interfaces with other systems. These subsystems are organically integrated horizontally and vertically on the basis of an Open Systems Architecture (OSA), forming a complete integrated management information system for distribution transformers. The network architecture of the GPRS distribution transformer monitoring system is shown in the figure below. The system is divided into four parts: the monitoring center main station, the network proxy server, the GPRS data transmission terminal, and the monitoring terminal equipment. The main station primarily handles human-computer interaction; the network proxy server is mainly responsible for establishing network data links and transparently relaying data transmission and reception; the GPRS data transmission terminal handles information uploading and downloading; and the monitoring terminal equipment mainly handles the acquisition of digital and analog signals. In this system, the network proxy server can use public internet connections such as ADSL or LAN, employing either a fixed public IP address or a dynamic public IP address with DNS resolution. For security reasons, the monitoring center's main station is located on a local area network (LAN) and is not directly connected to the internet; instead, the network proxy server handles the establishment of network data links and transparent relaying of data transmission and reception. After powering on, the GPRS data transmission terminal actively accesses the network proxy server based on its pre-set internal IP address or domain name, establishing a TCP/IP link between the proxy server and the monitoring center. The monitoring center's main station maintains the IP address and ID number of each connected terminal. When the main station needs to send a data request to a monitoring terminal, it locates the corresponding terminal based on the IP address and ID number, sends the command to that terminal, and after the terminal responds, sends the data to the network proxy server port via a GPRS data transmission terminal. The data is then forwarded to the monitoring center's main station via port mapping, completing a response-based communication process. This method is implemented via the Internet (CMNET), resulting in relatively low implementation costs for users. For applications requiring high-reliability data transmission, China Mobile provides a direct GPRS network access method. The monitoring center's main station directly connects to the GPRS mobile base station via a dedicated line and obtains a fixed IP address. Monitoring point data does not need to be routed to the Internet, and the monitoring point DTUs also use SIM cards with fixed IP addresses. This method of forming a point-to-multipoint network offers good real-time performance and high security, but the access cost is relatively high.