Based on the experience of our own work and the planning and construction work in the distribution network, this paper gives a brief introduction of the connotation of its adaptable professional evaluation, and looks forward to providing personnel reference for power system on the basis of the specific evaluation procedure, further promoting the professional level of distribution network planning and construction, and enhancing the reliability of the daily operation of power system.

As the most widely used device in the var compensation field,static var compensator(SVC) plays an important role in enhancing the grid reliability,improving the transmission limit and damping power oscillation,etc.The capacity of SVC installed in the key substations grows with the expansion of the power grid.This has put forward the heat increase of the valve.Based on the design of valve cooling-system of high-voltage large capacity,this paper briefly summoned the basic demands and constitution of cooling-system,analyzed the heat-dissipation in detail,and proposed a new design scheme to adopt dual parallel branch waterway for each level cooling-circuit of valve.

The operation of high-voltage transmission line can easily produce corona.It will not only consume a large amount of electric power,but also derive radio interference and hearable noises,which will badly affect the environment.Expanding shaped-wire conductor is a new kind of energy-saving conductor,which can increase the corona discharge voltage,reduce the metal material consumptions,lower the tower load,and reduce the project cost.This text will focus on the performance and advantages of the expanding shaped-wire conductor,and briefly introduce the process of production and quality control of the afore-said conductor.

型线扩径导线支撑层采用梯形线疏绕绞合,外层导体采用Z形铝线紧密绞合,表面光洁、成型紧密、结构圆整.绞合的单线,层与层之间为面接触,在施工过程中支撑层铝线不易出现移位,结构更趋稳定.不会出现象常规扩径导线由于支撑层铝线滑动而导致外层铝线凹陷或凸起等现象.型线扩径导线空隙填充与否,对金具的握紧力没有影响.但为了防止雨水进入对金具、导线的腐蚀,应进行适当地填充.型线扩径导线的结构、性能较圆线扩径导线更具优势,在平原和丘陵地区具有广阔的应用,应充分发挥其经济和技术优势.