The invention discloses a high-
voltage insulation current
lead structure, and relates to the technical field of superconducting equipment. The structure comprises a lower sealing piece, an aluminum tube, an
epoxy sleeve and a
copper conductor; the aluminum tube sleeves the
copper conductor, and an annular first gap cavity is formed between the inner wall of the aluminum
pipe and the outer wall ofthe
copper conductor; the
epoxy sleeve is coated outside the aluminum tube; the lower sealing piece is mounted at one end part of the
epoxy sleeve and is in sealing connection with the epoxy sleeve; aconnecting part connected with the lower sealing piece is arranged at one end, extending out of the lower sealing piece, of the
copper conductor; and a second gap cavity is defined by one end, facingthe lower sealing piece, of the aluminum tube, the inner end wall of the lower sealing piece, the inner wall of the epoxy sleeve and the outer wall of the
copper conductor. By means of the design, the lower sealing piece only makes contact with the epoxy sleeve and does not make contact with an internal aluminum tube, in the cooling process of immersion into
liquid nitrogen, the
cooling speed canbe effectively controlled, and the temperature nonuniformity in the longitudinal direction can be optimized and improved, so the relative deformation quantity between the aluminum tube and the epoxysleeve is controlled, damage is not likely to happen, and the structure can work better in a low-temperature and high-
voltage environment.