An example method for connectorizing a superconducting cable is described herein. The method can include depositing an oxide layer on a surface of a superconducting cable, electroplating a metal layer on the surface of the superconducting cable, and soldering a connector to the metal layer coated on the surface of the superconducting cable. The oxide layer allows the metal layer to adhere to the surface of the superconducting cable.

A thermal-insulated multi-walled pipe for superconducting power transmission comprises: a superconducting cable; a multi-walled pipe composed of a plurality of straight pipes and houses the superconducting cable; and a plurality of spacers that are located between adjacent two straight pipes of the plurality of straight pipes, wherein a cross-sectional shape of each spacer is a polygon having three or more vertices, each spacer has a through-hole at a center in the plane, an inner straight pipe is located to pass through the through-hole, a frictional coefficient μ.sub.i between each spacer and the inner straight pipe is 0.1 or less, a frictional coefficient μ.sub.o between each spacer and an outer straight pipe is 0.1 or less, and a ratio L.sub.d/d of a diagonal equivalent length L.sub.d of the polygon to an inner diameter d of the outer straight pipe of the adjacent two straight pipes is 0.9 or less.

A current lead assembly for minimizing heat load to a conduction cooled superconducting magnet during a ramp operation is provided. The current lead assembly includes a vacuum chamber having a through hole to enable a first end of a current lead contact to remain outside the vacuum chamber and a second end of the current lead contact to penetrate within the vacuum chamber. A vacuum boundary wall is located between the vacuum chamber and the current lead contact. At least one superconducting magnet is arranged inside of the vacuum chamber and includes a magnet lead. A second end of the current lead contact is coupled to the magnet lead via an internal lead. A vacuum cap is removably disposed to sealingly encompass therein the first end of the current lead contact during a first state of operation. The first end of the current lead contact is arranged to contact a power supply during a second state of operation, wherein the contact occurs exterior the vacuum chamber.

A current lead assembly for minimizing heat load to a conduction cooled superconducting magnet during a ramp operation is provided. The current lead assembly includes a vacuum chamber having a through hole to enable a first end of a current lead contact to remain outside the vacuum chamber and a second end of the current lead contact to penetrate within the vacuum chamber. A vacuum boundary wall is located between the vacuum chamber and the current lead contact. At least one superconducting magnet is arranged inside of the vacuum chamber and includes a magnet lead. A second end of the current lead contact is coupled to the magnet lead via an internal lead. A vacuum cap is removably disposed to sealingly encompass therein the first end of the current lead contact during a first state of operation. The first end of the current lead contact is arranged to contact a power supply during a second state of operation, wherein the contact occurs exterior the vacuum chamber.

A cylindrical joint for connecting sub-cables of a superconducting busbar includes a stainless steel shell, stainless steel pressure plates, first sub-cables, second sub-cables, copper saddles, a stainless steel support, indium coatings, stainless steel tapers. First and second sub-cables are supported by the stainless steel support. The first sub-cables and the second sub-cables are embedded into the grooves on the stainless steel support in sequence. The copper saddles are embedded into each of the grooves, and the indium coating is plated on both sides of the copper saddle, respectively. The stainless steel pressure plate is welded to the stainless steel support. The outer side of the joint is the stainless steel shell. The cylindrical joint of the disclosure has a low resistance, a lower AC loss, less materials, and a good cooling performance.

Provided is a thermal-insulated multi-walled pipe for superconducting power transmission that highly prevents intrusion of external heat due to radiation and has excellent thermal insulation property without using a superinsulation and can be produced easily. A thermal-insulated multi-walled pipe for superconducting power transmission comprises: a superconducting cable; and a multi-walled pipe that houses the superconducting cable, wherein the multi-walled pipe is composed of a plurality of straight pipes, and at least one of the plurality of straight pipes has, at a surface thereof, a coating layer containing a metal powder.

A 3-phase superconducting cable system (100) has four 1-phase superconducting cables (A, B, C, D). Interrupting switches (S1, S2, S3, S4, S5, S6) are arranged at respective first and second ends of a first (A), second (B) and third (C) of the 1-phase superconducting cables, and first connecting switches (S7, S9, S11) and second connecting switches (S8, S10, S12) are connected at a first and a second end, respectively, of the fourth (D) 1-phase superconducting cable. The interrupting switches (S1, S2, S3, S4, S5, S6) and the first (S7, S9, S11) and second (S8, S10, S12) connecting switches are operable to selectively disconnect one of the first (A), second (B) and third (C) one of the 1-phase superconducting cables from their respective current phase (L1, L2, L3) and to connect the fourth (D) 1-phase superconducting cable to the previously disconnected current phase (L1, L2, L3), effectively replacing the disconnected 1-phase superconducting cable.

A method is provided for setting up a transmission link for electrical energy, in which at least one superconductive cable and a cryostat surrounding the same are used, the cryostat having two metal tubes arranged concentrically in relation to one another, between which a vacuum insulation is provided. The ends of the cryostat in the assembled state as well as the superconductive cable located in the same are attached on fixed parts of the transmission link. At least at one end of the cryostat, there is gaplessly connected to the same a tube body which is bent by an angle of at least 180 and likewise consists of two metal tubes arranged concentrically in relation to one another, between which a vacuum insulation is provided. The superconductive cable protruding from the cryostat is arranged in the tube body at room temperature in such a way that it runs at least in the direct proximity of the wall of the inner tube of the tube body that has the greater bending radius.

A method is provided for setting up a transmission link for electrical energy, in which at least one superconductive cable and a cryostat surrounding the same are used, the cryostat having two metal tubes arranged concentrically in relation to one another, between which a vacuum insulation is provided. The ends of the cryostat in the assembled state as well as the superconductive cable located in the same are attached on fixed parts of the transmission link. At least at one end of the cryostat, there is gaplessly connected to the same a tube body which is bent by an angle of at least 180 and likewise consists of two metal tubes arranged concentrically in relation to one another, between which a vacuum insulation is provided. The superconductive cable protruding from the cryostat is arranged in the tube body at room temperature in such a way that it runs at least in the direct proximity of the wall of the inner tube of the tube body that has the greater bending radius.

For the transmission of electrical current, determined superconducting current carriers are accommodated in a cryostat, in which they are cooled with an undercooled cryogenic cooling medium, e.g. liquid nitrogen. The current carrier is electrically connected at the ends thereof to two normally conducting current supply means. The cooling medium is undercooled from a storage container to a temperature below its boiling temperature and supplied to the cryostat via a cooling medium inlet, brought into thermal contact with the superconducting current carrier, and subsequently discharged via a cooling medium outlet of the cryostat. According to the invention, the cooling medium from the cryostat is to be used for cooling at least one of the normally conducting current supply means.