Chuxiong Grid Transmission Lines Lead To The Flow Capacity Of The Empirical Analysis Of Transmission Capacity

With the increasing of the load of ChuXiong bureau, problem on limit of lines transmission ability is more and more obvious. This paper studies the transmission capability of network transmission interface under steady state security restriction with N-1 principle. On how to solve the problem, several strategies are available to be choose.This paper discuses some problems of raising permissible operating temperature of conductor, and analyses technology of increasing current-carrying capacity of overhead conductors by raising their allowable temperature and its application to 220 kV lines.For improving the transmitting capacity of transmission line, the method of applying dynamic monitoring technology was presented after theoretical analysis, test and research in lab, and feasibility study based on field conditions.The transmitting capacity of 220kV transmission line in ChuXiong power grid is restricted by thermal equilibrium. To enlarge the transmitting capacity, the author theoretically analyze the feasibility of increasing conducting wire's transmitting capacity by means of real-time monitoring the operation environment of conductors, and emphatically present the calculated conductor's current capacity according to on-site measured parameters such as wind speed, ambient temperature, sunshine intensity, etc., and the simulation result of temperature rise of transmission line. Both the results from calculation and simulation show that by use of on-site measured environment parameters of transmission line the real-time determination of conductor's transmitting limit is feasible, generally the transmitting capacity of transmission line can be increased in the range 10 percent to 30 percent.Lines' curve is one of the important factors impacting the safe running of transmission line. The mathematical relationships between span variation and line stress are analyzed.Chuxiong administration of power supply had done the following methods to improving transmission ability of 220 kV power network. For example, engineering technologies and measures for improving the transmitting capability of 220kv transmission lines, improving professional management of lines by using technological progress, feasibility study of real-time dynamic capacity-increase for transmission lines.Half year Operation of Transmission Line in Chuxiong Electric Power Bureau approved that the lines work well. As the first one to have this taste in area bureaus, the result benefits the related situations a lot.