Electromagnetic environment analysis of a software park near transmission lines

The electromagnetic environments (EMEs) of planned Zhongguancun Software Park near transmission lines, including electrical field, magnetic field and grounding potential rise under three cases of lightning, normal operation and short circuit faults, are assessed by numerical analysis. The power frequency electromagnetic environments of the software park are below the maximum ecological allowed exposure values for the general public, nevertheless the power frequency magnetic field may interfere with the sensitive computer display unit. The influence of short-circuit fault in two different cases of remote short-circuit and neighboring short-circuit on the software park was discussed. The main problem we must pay attention to is the ground potential rise in the software park due to neighboring short-circuit fault, it would threaten the safe operation of electronic devices in the software park. On the other hand, the lightning strike is a serious threat to the software park, protective countermeasures should be adopted to improve the electromagnetic environments of the software park.