Comparison Of GIL With Overhead Transmission Line And Analysis Of The Feasibility Of GIL Instead Of Overhead Transmission Lines

For the transmission of electric power from generating stations to load centers and grids the transmission lines are used. Smart energy consumption and electricity market prices required transmission lines to connect power houses to load centers which is named as smart grid. Mostly thermal power stations are located near to load centers.For transmission lines, there are overhead and underground transmission lines. In underground transmission there are underground cables and from last40years a new technology GIL is introduced, which is the best replacement for underground cables. GIL is available having low transmission losses, low capacitive load, high level of personal safety, high reliability without any electrical aging, having minimum interference with magnetic fields and many more.In this research the losses and voltage drops of same voltage rated overhead lines are compared to GIL lines. The simulation in PSCAD is done using the parameters of overhead and GIL lines of same rated voltages (230kV,345kV,500kV,765kV,1100kV). The length of line is taken as100km in both cases. The comparison graphs of percentage losses and voltage drops are plotted using MATLAB. The current carrying capability is also compared using different formulas of500kV for both cases GIL and OHL.