The invention provides a
simulation experiment device and a method of
alternating current,
direct current and
impact performance of a large earth screen. The device mainly comprises a rectangular simulated slot, an earth screen model equivalently reduced, an alternating and
direct current experimental power supply, an
impact current generator and a precise
positioning system, and is characterized in that
metal grids are laid on four walls and the bottom inside the rectangular simulated slot, so as to form a mesh
backflow electrode; a
liquid medium is injected into the slot; the earth screen model is designed and manufactured according to the experimental objective and content; the precise
positioning system comprises an electrically controlled traveling crane and a
total station; and the
electric potential in any position in the rectangular simulated slot is convenient to measure at a fixed point through the coordination work of the electrically controlled traveling crane and the
total station. The
simulation experiment device and the method can meet the
experimental research on
direct current,
power frequency and
impact grounding properties of the large earth screen, can also be extensively applied to the fields, such as the
experimental research of influence on aquatic
organism and
metal pipelines by an alternating and direct current
system and corrosive property, and the like, and have the advantages of simplicity in operation, large
power capacity, durability, flexibility and diversity in refitment and the like.