Study On The Whole Scheme Of Substation 220 Kilovolt Maokou

220kV substation as the main power city grid, power supply reliability, andsubstation equipment operation reliability, directly affects the reliability of power supply.220kV Maokou variable as the main power supply of the northern city of Lianyungang, has been in operation for 24 years, equipment,construction and other problems, power supply capacity can not meet thedevelopment needs of regional load, the need for the overall transformation.Through the research on the project, which can effectively solve the current problems of Maokou variable, the reliability of power supply and power supply capacity of Maokou to change, to meet the demand of regional economy development.This paper first introduces the status of 220kV Maokou change, analyzes thenetwork structure, equipment, a two time and far east equipment, civil part,circuit part and the load situation, find out the existing problems, puts forwardthe overall transformation needs; with the development of the regional economy and power grid planning, research the reconstructed voltage substations selection, model using the minimum cost of power grid development cost method, voltage grade substation selection and application model by investment cost; comprehensive land use and environmental requirements of the three kinds of substation integrated reform scheme,through technical, economic comparison of recommended scheme of optimal;on this basis, study and propose specific design transformer substation construction, carried out the study design a transformer, the main wiringscheme, main equipment, and puts forward the design scheme of the main transformer protection, line protection, bus protection scheme and the Far East, two communication schemes. The specific design of Maokou of variableand the whole scheme of the substation, the operation reliability is not high,the problem of insufficient power supply capacity, reliable power supply,sufficient for regional load development, to meet the economic and social development needs of Lianyungang city.