Design For Medial Voltage Distribution Of Network Planning In Modern City

With the rapid progress of national economy in our country, power becomes more and more important. Realizing safe and economical function of power system and ensuring reliability and quality of power supply should not be ignored. All these cause huge press to distribution system in our country. So it is obviously urgent to modify current status of weak network, lack of reliability, high wastage, poor quality of voltage and low level of automatization. Rebuild high-voltage network planning must be carried out.The paper is based on the course of planning of Hengyang network that I ever took part in. Basing on the planning of Hengyang network and also taking the integrality of the structure of this paper into thought, it specifies the whole planning idea form the first step, i.e. analysis of current status, to drawing out the new scheme of network planning and carrying through investment evaluation.The Paper begins with the necessary and required principle of network planning according to current Hengyang network. Then after the significance and necessary of load forest are analyzed, the theorial proof is described and the principle of several traditional load forest methods is concluded, and it seperately forests the energy cost of total region and various vocations. Sector load forest should be carried out according to the land planning following with the result of total load forest to distribute the total energy in order to carry through network programming.Following with the result of load forecasting, Paper analyzes the actuality of Hengyang network, in which the principle for selecting network project is figured out, then the network over Hengyang city is taken as an example to explain the problem. The final network scheme must satisfy the load in the future and the principle of the most economic investment, besides getting rid of the problem exists in the current distribution over Hengyang city. After the network planning, the paper gives out the evaluation of invest and economic benefit and points out that network planning has brought out the social and economic benefit, which donates the necessity of network planning.