Electromagnetic Field Distribution of Phase-sequence Orientation of a Double-Circuit Power Transmission Line Based on Finite Element Method

This paper proposes a mathematical model of electric and magnetic fields caused by high voltage conductors of electric power transmission systems by using a set of second-order partial differential equations. This study has considered the effect of conductor phase-sequence orientation on electromagnetic fields emitted around a double-circuit, extra high-voltage, power transmission line. Five typically-used phase-sequence orientations in Thailand and one three-phase fault for 500-kV double-circuit transmission lines are examined. Computer-based simulation utilizing the two dimensional finite element method in the time harmonic mode, instructed in MATLAB programming environment with graphical representation for electric and magnetic field strength have been evaluated. The simulation results showed that the phase-sequence orientation is one among key factors to influence the electromagnetic field distribution around the transmission line. Key-Words: Phase-sequence, Electric Fields, Magnetic Fields, Finite Element Method (FEM), Transmission Line, Computer Simulation