| With the high-speed development of the suburbs,low voltage circuit with variable volume load substantial increase,the original power supply circuit caused many problems,such as line load problem,line arrangement is not reasonable,unreasonable connection mode,power quality not up to standard,high line loss.suggestions,become the obstacles which restrict the development of the city.This at present,the country and the power grid in recent years have related industrial policy,in August of 2015,China launched a distribution network construction renovation plan of action,and put forward 2015-2020,distribution network construction renovation investment of no less than 2 trillion yuan,including investment of not less than 300 billion yuan in 2015,during the period of "much starker choices-and graver consequences-in" accumulative total investment of not less than 1.7 trillion yuan,and regulation of the power supply company money you must invest in network reconstruction.In January of 2016,China's energy administration further introduced the distribution network planning and design technical guideline of DL/T 5729-2016,the guidelines for the low voltage distribution network reconstruction technique in DL/T 599-2016 and the guidelines for the county distribution automation technology DL/T 390-2016 three distribution network standards,such as new standards and regulations on June 1,2016.By analyzing the present situation of shenyang yuhong power supply company of power,it is concluded that the current number of lines there are serious power quality problems such as line loss,voltage and current.And the substation is aging,design is not reasonable,low LianWangLv,without the embarrassment of automation degree and countries are far from the requirements in 2020.Fan Tun region,for example some lines 389 a maximum load current;Part of the end of the line voltage is 8.9 KV,an average of more than 10%,line loss.suggestions caused by unsafe state power at the same time to waste a lot of energy.Based on this the paper on the basis of national policies and relevant requirements for shenyang yuhong,analyzing the power line of the power supply company transform first,this paper analyzes the present situation of rural power company power supply circuit,and research the transformation technology standards of the state and its basic theoretical knowledge.Then comprehensive analysis of the technical characteristics of the low voltage power grid at home and abroad,and it is concluded that low line loss.suggestions in foreign countries mainly consists in the power grid comprehensive analysis level,new technology lies in the active compensation circuit analysis,comprehensive reason lies in the reasonable line layout,realizes the good line loss.suggestions and power quality control;Domestic technology is mainly manifested in a variety of power supply circuit load calculation,power factor calculation,line loss.suggestions calculation.In this paper,based on state transformation of rural power grid construction standards Fan Tun region demonstration,mainly reflected in the reconstruction of substation design,wire diameter,reactive power compensation,feeder automation transformation,etc.,relying on the new standard of the renovation is not at home and abroad related comprehensive research reports,this article research results for subsequent shenyang yuhong power supply companies and other related electric power distribution network reconstruction.Finally,the average power factor is 0.88,the average line loss rate is still as high as 10%,the voltage qualified rate is up to 99%,and the annual energy consumption is 1.06 MWh.The total cost of renovation line renovation cost is 6 million 440 thousand yuan,the reactive power compensation cost of 783 thousand and 100 yuan,the total cost of 7 million 223 thousand and 100 yuan,ten years accumulative total saving purchase cost 42 million 400 thousand yuan,the economic benefits of up to 28 million 410 thousand yuan,has great economic benefits. |
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