I. Introduction
With the development of science and technology, the automation of medium and low voltage distribution networks has become the trend of power system development. As the last link of the transmission and distribution system, the medium and low voltage distribution network is closely related to the quality and reliability of power supply and use. For this reason, this article makes a brief discussion on the necessity of the automation of medium and low voltage distribution network and its implementation scheme.

A distribution transformer is a power device that distributes electrical energy directly to low-voltage users. Its operating data is an important part of the basic data of the entire distribution network. Therefore, it is necessary to monitor its operating parameters and status. This article discusses the use of GPRS as a means of communication to establish a distribution transformer monitoring system.

In the communication of the distribution transformer monitoring system, data transmission radio stations, GSM short messages, optical fiber access, etc. can be used. The advantage of the digital radio station is that in addition to the annual frequency fee, there is no additional cost for normal operation; the disadvantage is that it is greatly affected by the terrain and climate, resulting in poor system reliability and real-time performance, and cannot be reported actively. The GSM short message method can achieve active reporting; the disadvantage is that it is charged on a per-item basis, the operating cost is high, and the delay is quite long when the server of the short message center is busy on holidays. Optical fiber communication is stable and reliable, but the construction cost is large, the scalability is poor, and the equipment maintenance is inconvenient. GPRS communication avoids the above problems.