Research on characteristic of power frequency electromagnetic wave energy radiation of mine-used cable

Power frequency electromagnetic interference of mine-used cable is an important factor which affects reliability of underground wireless communication. Wavelength of power frequency electromagnetic wave is much larger than mine roadway size, so electromagnetic field energy conversion of power frequency electromagnetic wave cannot be executed effectively in mine roadway, and electromagnetic coupling propagation equation of electromagnetic wave in free space cannot be used to study characteristic of power frequency electromagnetic wave energy radiation of mine-used cable. In view of the problem, a model of power frequency electromagnetic wave energy radiation of mine-used cable was built based on short dipole and formulas of magnetic field and electric field of the short dipole were deduced. Based on finite element method and finite difference method, electric field intensity of mine-used cable at different location of mine roadway was analyzed though numerical calculation. The results show that electric field intensity of various points at the same height as cable decreases with increase of distance between each point and the cable. Electric field intensity of various points at height differing from cable and parallel to roadway roof decreases with increase of distance between each point and the cable, which is smaller than the one at the same height as cable. Electric field intensity of various points at the same side as cable decreases with increase of distance between each point and the cable. Electric field intensity of various points at side differing from cable is smaller than the one at the same side as cable, which is less affected by distance between each point and the cable.