电气工程及其自动化毕设之文献翻译.docx

3 文献翻译 学院名称 电气工程学院 指导教师 职 称 班 级 学 号 学生姓名  第  PAGE \* MERGEFORMAT 16 页，共 16 页 Electric Power Systems Introduction of Electric Power Systems As the power industry grows, so do the economic and engineering problems connected with the generating, transmission and distribution systems used to produce and handle the vast quantities of electrical energy consumed today. These systems together form an electrical power system. It is important to note that the industry that produces electrical energy is unique in that it manufactures its product at the very instant that it is required by the customer. Energy for the generation of electricity can be stored in the form of coal and oil, and of water in reservoirs and lakes, to meet future requirements, but this does not decrease the need for generator capacity to meet the customers’ demands. It is obvious that the problem of the continuity of service is very important for an electrical power system. No service can be completely protected from the possibility of failure and clearly the cost of the system will depend on its requirements. However a net reliability gain is obtained by employing a certain number of generating units and by using automatic breakers for the separation into sections of the bus bars in generating stations and of the transmission lines in a national or international grid system. In fact a large system comprises numerous generating stations and loads interconnected by high-capacity transmission lines. An individual unit of generation or set of transmission ‘lines can usually cease to function without interrupting the general service. The most usual system today for generation and for the general transmission of power is the three-phase system. In favor of this system are its simplicity and its simplicity and its saving with respect to other a.c. system. In particular, for a given voltage between conductors, with a given power transmit