Prof. Samy Mohamed Ghania :: Publications:

High voltage substations are the main part in any power system utilities or municipalities. Proper design of lightning protection system should be done in the preliminary stage of the design process. In this paper, a typical high voltage substations of 500/220 kV is modeled by developing multi-scripts of Matlab m-files. To allocate and to simulate the whole carrying current conductors inside the substation and with 100 m length of input and output power lines. This is to calculate and to demonstrate the lightning electromagnetic fields inside the substations during lightning conditions using the Finite Difference Time Domain (FDTD) method with Maxwell’s equations. The effects of the posts allocations, its heights and surge arrestors to secure optimum protection zones are investigated. The electromagnetic fields distribution around the posts and inside the entire area of the substation during lightning conditions are evaluated. The electromagnetic fields for lightning over the input/output power lines are depicted to stand precisely of how much of interference with the electronic devices inside the control room during the very small lightning interval. The obtained results while lightning strikes the masts or input/output lines show a reasonable deviation between the electromagnetic field values and the regulation standards.