Analysis of magnetic field generated by overhead cables

Overhead cables are widely applied in power distribution and transmission networks due to their financial and geographical merits. But since the environment issue has become a general concern, negative impacts of overhead cables are no longer negligible. Although overhead transmission lines are gradually being replaced by underground cables for the purpose of improving the security and stability of power transmission system, a large number of overhead cables are still in use. If buildings are built below the high voltage cables, people who stay inside will be adversely affected by power frequency magnetic fields. In order to solve this issue, our paper studies the distribution of magnetic field produced by a 500 kV cable, and proposes a shielding method to reduce the indoor field intensity. In this research, field distribution is analyzed through simulation, and the maximum indoor field intensity is calculated and compared with safety limits in the guide rule of limitation. Shielding method proposed in this paper provides good protection performance and halves the indoor intensity of magnetic field produced by the 500 kV overhead cable.