Chapter 1 Introduction Power supply and distribution technology is to study the supply and distribution of electricity. Electric power is the main energy and power of modern industrial production, civil houses, enterprises and institutions, and it is the material and technical basis of modern civilization. Without electricity, there would be no modernization of the national economy. The informationization and networking of modern society are based on electrification. Therefore, if the power supply is suddenly interrupted, it will have a serious and far-reaching impact on these power consumption departments. Therefore, it is of great significance to do a good job in power supply and distribution to ensure normal work, study and life. In order to better serve the power sector and the national economy, the power supply and distribution work must meet the following basic requirements: (1) Safety-no personal accidents and equipment accidents occur in the process of power supply, distribution and use. (2) Reliability-The requirements of power users for reliability and continuity of power supply should be met. (3) High quality-it should meet the requirements of power users for voltage quality and frequency quality. (4) Economy —— The power supply and distribution system needs less investment and low operating cost, so as to save electric energy as much as possible and reduce the consumption of non-ferrous metals. In addition, in the power supply and distribution work, we should also deal with the relationship between the local and the overall situation, the present and the long-term, that is, we should not only take care of the local and current interests, but also have a global view, which can not only take care of the overall situation, but also adapt to development. The topic of our graduation project is: the overall planning and design of power supply and distribution project in a university; As a university, with the promotion of undergraduate education and the continuous expansion of enrollment in the next few years, it will pose a considerable challenge to the school's infrastructure construction, especially the construction of power facilities. Therefore, when designing power supply and distribution, we should plan ahead. Provide enough space for future development: this is mainly manifested in power transformers and some important distribution lines. On the basis of meeting the existing demand, we should make great choices to avoid the situation that a transformer or a batch of transformers are gloriously laid off because of capacity problems just after serving for a few years. In a word: locate reality and focus on the future; Design this topic from the perspective of development.