The invention provides a new type of
electromagnetic shielding structure under the strong
electromagnetic environment of a giant hydro-generator, which includes multi-layer
silicon steel sheets and a layer of aluminum plates that are stacked and laminated in parallel; the multi-layer
silicon steel sheets and a layer of aluminum plates are sequentially stacked and fixedly connected An integrated shielding structure is formed; multiple channel steels are evenly arranged on the surface of the
machine pit wall opposite to the
copper bar, and the shielding structure is arranged parallel to the
machine pit wall and fixedly connected with the channel steel; the
silicon steel sheet is close to the
machine pit wall, and the aluminum plate is close to the
Copper row; silicon steel sheet builds an ultra-high magnetic permeability path within the space of the leakage
magnetic field, changing the distribution of the spatial
magnetic field, so that the
magnetic flux leakage that intentionally enters the
steel bar enters the silicon steel sheet; the
magnetic field line passes through the aluminum plate vertically and enters the silicon steel sheet. Induced current, the induced current also generates reverse
magnetic flux leakage, which offsets the
magnetic flux leakage generated by the original
copper bar. The invention is used to prevent the overheating of the
reinforced concrete structure in the wall of the machine pit caused by the strong
electromagnetic environment, and the reduction of the structural strength caused by the overheating.