The construction of the 750-kilovolt Yan'an Substation,the country's highest voltage grade smart substation,in Luochuan County,Yan'an city,Shaanxi Province,is progressing smoothly.At present,the civil engineering of the station has completed 90%of the engineering volume,the electrical engineering has completed the installation of the main transformer and 750 kV equipment,and the secondary equipment installation and commissioning is under way.The substation is one of the first four pilot smart substations of the State Grid Corporation of China.It is expected to be put into operation in March next year,and will play an important leading and demonstration role in the construction of smart grid nationwide.

The substation was built by Shaanxi Transmission and Transformation Engineering Company.On November 18,Lei Jianguo,manager of the Yan'an Transformer project of the Shaanxi Power Transmission and Transformation Engineering Company,told China Energy News:"As the country's highest voltage level smart substation,the 750-kV Yan'an substation has a high technological content,and many technologies and equipment are the first of their kind in China."

The design of this station adopts intelligent primary equipment to realize on-line detection,fault diagnosis,state maintenance and intelligent control of operation.Intelligent station power system is adopted to realize informationization,automation and interaction of low-voltage AC power supply.Dc integrated system integrates DC power supply,inverter power supply and communication power supply system to form a unique DC power supply,highlighting the characteristics of smart substation.

The 750 kV frame of the station does not have temperature expansion joints,saving an area of 3.7 mu;330 kv frame longitudinal without temperature joints,saving 0.56 mu of land area.This station has many optical cables,few cables and high degree of automation.In design,two 750kV relay rooms are integrated into one,and three 330kV relay rooms are integrated into one.The total floor area is reduced by 190 square meters,which reflects the remarkable characteristics of"resource-saving,environment-friendly and industrialized".In addition,aiming at loess geology,this station adopts the construction scheme of deep dynamic compaction pile and bored cast-in-place pile for the first time to eliminate the influence of loess collapsibility and improve the uplift and compressive bearing capacity of cast-in-place pile.In the smart grid technology and advanced equipment application,has an important leading demonstration role.

The 750-kilovolt Yan'an substation covers an area of 13.74 hectares with a construction area of 1505 square meters.One set of 2100 MEv main transformer and two sets of long-term transformer shall be installed in this period.750 kV current period twice,forward 8 times,330 kv current period 4 times,forward 12 times.It is of great significance to meet the power supply load in Northern Shaanxi and the access of yan'an and other large power plants and to strengthen the main network structure in Shaanxi.Construction began in April 2009.

Since construction,installation of electricity transmission&transformation facilities of shaanxi has changed the yanan construction as a key project of nearly two years to strengthen organizational leadership,yanan intelligent construction leading group and special team consists of five,organizing construction planning,coordination of resources configuration,priority of people,materials,supplies,safety,quality,progress,civilization construction and comprehensive archives check,push forward the progress.

On April 6,2010,the lifting of the 750 kV framework was in full swing.There are a total of 66 lifting tasks,including 32 lifting(times)of beam and 34 lifting(times)of column.The beam has a maximum span of 52 meters and the column has a maximum net weight of 31 tons.The span and weight of lifting operation are the largest in the 750 kV substation project built or under construction.The company adopted the method of 250 tons crawler crane and 50 tons crane,and completed the lifting work with a total weight of 1200 tons in only 11 days,which set a new record for the lifting of large-scale substation.

Up to now,the project inspection pass rate is 100%,and the entity random check conforms to the current standards,regulations and specifications of the State Grid Corporation.