The research of EMS in the print circuit board of the secondary equipments for HVDC

The electromagnetic environment of the High Voltage Direct Current (HVDC) is much more complex than ever, main protection plus backup protection with tradition meaning are limited. The EMC of the PCB in the secondary equipments is top priority. In this paper Finite Integration Theory (FIT) method was applied to the analysis the resisting EMI of the PCB in high frequency. The model bases of the real object of secondary equipment. We simulate two directions of incident wave propagation at 0-2 GHz, and analysis the induced voltage, electric field, magnetic field intensity and surface current at the loop.