Magnetic field protection method and device for dry-type hollow bridge arm reactor and protective fence

The invention relates to a magnetic field protection method and device for a dry-type hollow bridge arm reactor and a protective fence. Comprising the following steps: respectively applying an excitation signal to each encapsulation layer of the dry-type hollow bridge arm reactor; and analyzing by using a preset finite element two-dimensional magnetic field model corresponding to the dry-type hollow bridge arm reactor to obtain magnetic field distribution state information of the current dry-type hollow bridge arm reactor; then performing further analysis in combination with the magnetic field distribution state information to obtain distance information and height information of the protective fence set when the influence on the health of the user is small, and finally building the protective fence in combination with the distance information and the height information. According to the scheme, the protective fence can be built around the dry-type hollow bridge arm reactor according to the actual magnetic fi