الفهرس | Only 14 pages are availabe for public view |
Abstract I N T R 0 D U C T I 0 N. The electric power system includes generating, transmission, and dj_stribution systems. Generally, the sum of the capital investment of generation and distribution facilities is over 80 percent of the total system investment. The economic importance of the distribution system requires a careful engineering planning, design, construction, and good performance of operation and maintenance. The integrated distribution system, from the engineering point of view, includes the subtransmission circuits, primary substations, distribution points, main primary feeders, distribution transformers (kiosks), primary feeder sections, secondary circuits, and customer service connections. As far as the Egyptian electric distribution system is concerned, the statistics of the data collected over about 10 years proves that the demand of the electric energy has been highly increased. The annual rate of its increase reached about 14% which is considered a very high rate compared to the international rates. Therefore, the electric power engineers, planners,and investigators recently pay a careful attention and special interest to the planning of either new distribution networks or expansion of the present networks. Thus, the elaboration and development of the planning of the distribution networks to meet the demand required by the land use, has gained a prime interest and importance. Further, the objective of the distribution system planning - as known - is started from the demand loads required by the secondary connections (customers) till the bulk power substations. Furthermore, the investment for the different components as well as the energy losses costs are main factors affecting the planning and design of the distribution networks. Hence, for the system planning, it is essential to assure that the growing demand for electricity can be satisfied by distribution system additions which are both technically adequate and acceptably economical. The above considerations call strongly for continuous efforts of researchersand engineers to develop reliable concepts and rules for distribution system planning. Unfortunately, previous investigation |