Simple study on resisting EMI of the Print circuit board in the secondary equipments of HVDC

The electromagnetic environment of the high voltage direct current (HVDC) is much more complex than ever. The electromagnetic compatibility (EMC) of the printed circuit board (PCB) in the secondary equipments is the top priority. In this paper, finite integration theory (FIT) methods are applied to analyse the resisting electro magnetic interference (EMI) of the PCB in high frequency. The model bases of the real object of secondary equipment are put forward. Two directions of incident wave propagation at 0-2 GHz is simulated, the induction voltage, electric field, magnetic field intensity and surface current at the loop are analysed. The simulation results show that if the field conditions lead more than 2 GHz incident wave, the electric field intensity may be higher enough to make the devices out of work, the shielded enclosure on microchip is needed in this situation.