| Along with the rapid development of national economy, the consumption of electric power construction industry is growing larger and larger. In order to meet the demand for energy cause by this rapid economic growth, saving the limited recourses and reasonable design of power facilities become particularly important. The research and application of miniaturization of 500kV substation is not only necessary but also urgent under this growing scarce of land recourses. As one of the most developed provinces in China, Zhejiang province is also well known in the shortage of land recourses. Therefore, the research of miniaturization of 500kV substation is more than resolving the contradiction between supply and demand in power, and it will also lead to both the growth of economy and the enforcements of the power grid as well. In the other hand, the land recourses saving, better protection of the environment and conservation for water and soil will also benefit as well.In order to bring in the goal of optimization of Substation design, this paper will start from analysis of commonly used equipment manufacturers. After that, this paper will optimize miniaturization of the substation from different component such as station layout and planning, the main electrical wiring, power distribution equipment, the main transformer and reactive power compensation device and the building of each component of substation; analyze of miniaturization equipment problems and the solutions is included as well. The optimized design scheme of miniaturizing the 500kV substation will be reached from the perfection of technology in equipment miniaturization as well as the design of the actual substation. With the 500kV substation of Lanxi, Yuhuan and Qianjiang, which is still in plan, as the background base, the study in this paper has the authentic and complete data; the conclusions in this paper have a good reference value and significance in either the research or application of substation miniaturization.
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