The Selection Of The Transformation And The Secondary Loop Application In ChaoYang BaoGuo 220kV Substation

With the rapid development of social economy and technology,the environment and climate of human survival have been exacerbated.At the same time,the social development is facing energy security,and the safe and reliable operation of power system is becoming more and more prominent.In order to better develop society and economy,the development of low-carbon power,the development of smart grid technology,the development of clean energy,the implementation of sustainable development,the development of the power industry is the main direction,but also the future development goals of power companies.Compared with the conventional substation,the biggest change of the intelligent substation lies in the secondary system.The digitization of information is the biggest characteristic of the secondary system of the intelligent substation.It is mainly embodied in the secondary system architecture,data acquisition mode,data transmission mode,current and voltage circuit,The station communication protocol and so on have undergone a fundamental change.Therefore,in the new substation project,the design meets the needs of regional economic development and power grid development,the secondary system structure is reasonable,stable operation,easy maintenance of intelligent substation is very necessary.Transformer selection is a key part of intelligent substation,the current electronic transformer in the amount of information technology,control integration,equipment intensive,maintenance flexibility has played a positive role,but also because of its technology is still in the development stage,in the The stability and reliability of the field are relatively low compared to conventional transformers.Conventional transformer + combined unit structure model,in recent years,intelligent transformer substation used in the mode,that is,the use of conventional electromagnetic transformer to collect current,voltage,analog to digital conversion.The merging unit is the source of the sampling data of the substation compartment and the equipment controlled by the station control layer,which digitizes the equipment collected by the process layer and realizes the sharing.This can achieve the purpose of running stability,but also indirectly meet the intelligent substation on the current,voltage acquisition form of rigid requirements.Secondary circuit trip mode,the intelligent substation is the use of digital signal transmission,the sampling and tripping can have a variety of flexible combination of direct mining straight jump,net mining jump,straight net jump three application mode.Three models have applied in practice,but the network mining network jump,straight mining network jump mode due to the shorter running time,in practice still need to be improved.Based on the new engineering of 220 k V intelligent substation of Baoshui,this paper analyzes the merits and demerits of three kinds of intelligent transformer substation selection from engineering adaptability and economic and technical requirements.According to the application situation of Chaoyang city,Type of device.On the basis of the above,from the net mining network jump,straight mining net jump,straight straight jump three ways to choose the best choice to determine the country to change the secondary circuit trip,the secondary design of the substation system.