Device and method for continuously measuring on-site critical current of superconducting cable

The invention discloses a superconducting cable on-site critical current continuous measurement device and method. The device comprises a rotating disc, an electromagnet, an incoming line electrifying electric claw, an outgoing line electrifying electric claw and a double-layer guide pipe. The electromagnet is mounted on the turntable and synchronously rotates along with the turntable; the electromagnet is used for applying a background magnetic field to the high-temperature superconducting cable; the double-layer conduit penetrates through a middle magnetic pole of the electromagnet and a through hole in the turntable; an annular cavity between an inner pipe and an outer pipe of the double-layer conduit is used for introducing a refrigerant, and the inner pipe of the double-layer conduit is used for penetrating a superconducting cable to be tested; the wire inlet electrifying electric claw and the wire outlet electrifying electric claw are arranged at the two axial ends of the double-layer guide pipe; the in