Research On The Construction And Reliability Of Middle And Low Voltage Distribution Network In Northeast Of Guangdong

Xingning city is located in the northeast of Guangdong Province,has the following characteristics: main rural areas,hilly terrain,population is relatively dense,low per capita electricity consumption,at the same time there is a rapid increase in electricity consumption.Existing rural power grid,there are old and backward,imperfect situation;power supply growth rate is fast,the old power grid can not guarantee the rapid rise in demand for electricity;large industrial use of electricity,low proportion of commercial electricity,resulting in the overall profit problem;the urgency of power grid construction.Especially in rural area power distribution network is backward,resulting in many problems,If these problems are difficult to solve,will greatly affect the overall level of Guangdong power grid and the southern power grid.Through the collection and analysis of line loss data of the power distribution network of Xingning county Power Supply Bureau of Guangdong Power Grid,the main problems are as follows: the lack of line cross-sectional area leads to high load loss and high line loss,the total length of a single distribution line leads to a larger line loss;insufficient segment numbers an d branch lines lead to high trunk load;too much high line loss,lack of integrity,no long-term system planning.According to past experience and traditional ideas to solve these problems c an only temporarily ease,but not cure.To this end,I put forward a new rural power grid const ruction ideas-20 kV node radiation direct supply and distribution network combined with the end line buck 10 kV structure.This structure targeted to solve the big problem,which is due to the long line length the remote mountainous areas of rural areas leads to a larger line loss.Th rough the equipment finishing,node setting,line rectification and node connection,the establi shment of auxiliary lines,the overall optimization and operational research layout of Xingnin g Power Supply Bureau of the distribution network for all-round optimization.Through promoting the use of 20 kV node radiation direct supply network with the end of the line buck 10 kV structure in Xingning Power Supply Bureau,the overall line loss rate is e xpected to be reduced to 2%-4%,which will greatly reduce the power loss and meanwhile im prove the efficiency and save energy to a great extent.Accompanied by the upgrading of the structure can also greatly improve the reliability of Xingning Power Supply Bureau distribution network.