Simulation And Experimental Research On Gas Insulated Metal Enclosed Transmission Line

During the 13 th Five-Year Plan period,electric power development planning point out that UHV construction is a key national innovation strategy,should construct large,hydropower nuclear power and smart grid city project.For the construction of large hydropower station,because of the new planning large hydropower project site is located in the plateau area in the mountain valley,it is difficult to send electricity;For the construction of nuclear power project,due to the particularity of the nuclear accident,so nuclear power must guarantee absolute safety in the process of transmission,the conventional transmission way completely unable to meet the requirements;For the smart grid construction of cities,as urban land available area is smaller and smaller,and the city power consumption increased year by year,and usable area is restricted to overhead line,capacity constraints cable.Gas insulated metal enclosed transmission lines(GIL)as a kind of transmission capacity,its advantages include low resistance loss,security,environmental protection,aseismic ability strong,has an irreplaceable role in the above field.Paper on the basis of GIL theory knowledge,respectively for the temperature rise of the insulation,thermal stability and parameters calculation,theory analysis and design of three parts,GIL simulation model is established,and simulation is conducted with the aid of finite element analysis software Comsol,finally the correctness of the calculation and design are verified through the experimental simulation model.The paper research content mainly includes the following aspects:(1)To establish 3 d insulation GIL simulation model,using the finite element software Comsol in electrostatic field quantities,to the coaxial cylindrical part of the conductor surface electric field intensity,insulation on the surface of the internal electric field intensity,insulation parts is developed for the calculation of the tangential field strength,and solving the conductor diameter and the shell outer diameter of GIL;(2)Establish a GIL a one-dimensional simplified mechanics model,using the "beam" physical quantities in the Comsol software,simulation calculation of natural frequency of the length of the GIL,so as to avoid conductor resonance phenomenon;(3)Establish a GIL two-dimensional electromagnetic simplified model,using Comsol "magnetic field" of the physical quantity and its transient solver,for maximum moment of electric power and size of simulation research;(4)To establish the GIL two-dimensional temperature rise model,using the "conjugate heat transfer" physical quantity and its transient solver in Comsol,the temperature rise of the conductor and the shell in the GIL temperature rise model is simulated;(5)GIL simulation model test.Based on the prototype of GIL insulation test,dynamic thermal stability test and temperature rise test,obtained similar results with the simulation results,in the GIL development process using finite element analysis software is reliable,and can get better performance,more reasonable product structure.