A method for cooling high temperature superconducting (HTS) cable comprising receiving a first flow of coolant at a first section of HTS cable and permitting the first flow of coolant to flow therethrough. The method also includes receiving a second flow of coolant at a second section of HTS cable and permitting the second flow of coolant to flow therethrough. The first section of HTS cable and said second section of HTS cable are coupled via a cable joint, the cable joint electrically connecting the first and second sections of HTS cable. The cable joint is in fluid communication with at least one refrigeration module. The cable joint includes at least one conduit configured to permit a third flow of coolant between the cable joint and the at least one refrigeration module through a coolant line separate from the first and second sections of HTS cable.

Technologies are described for methods and systems to generate a splice between a first and a second piece of conductor material. The methods may comprise identifying a first overlap area for the first piece on a first conductive surface. The first piece may include the first conductive surface and a first non-conductive surface. The methods may comprise identifying a second overlap area for the second piece on a second conductive surface. The second piece may include the second conductive surface and a second non-conductive surface. The methods may comprise pre-tinning the first and second overlap areas with solder to produce first and second pre-tinned areas. The methods may comprise stacking the first and second pieces so that the first and second pre-tinned areas are in contact and applying heat to the first non-conductive surface sufficient to melt the solder and generate the splice between the first and second pieces.

This invention concerns a cryo-cooled electrical conduction network. The conduction network has an electrical network divided into two or more conductive sections, each section comprising electrical equipment (24, 28). The conductive network also has a coolant network for maintaining the temperature of a coolant in each section. The electrical equipment (24, 28) and a corresponding portion of the coolant network of each section is housed in a section enclosure (10, 12, 14). The coolant network includes a coolant interface (40) located between each section, wherein the coolant interface (40) is housed in an intermediate enclosure (16, 18, 20, 22) that is isolatable from the section enclosures (10, 12, 14) in the electrical conduction network.

The embodiments herein describe technologies of cryogenic digital systems with a power supply located in an ambient temperature domain and logic located in a cryogenic temperature domain. A pair of conductors is operable to carry current with a voltage difference between the power supply and the logic. The pair of conductors includes a first portion thermally coupled to a temperature-regulated or temperature-controlled intermediate temperature domain. The intermediate temperature domain is less than the ambient temperature domain and greater than the cryogenic temperature domain.

An electrical circuit to interrupt a DC current includes a bypass switch and an AC high voltage breaker which includes interrupters that are rated for carrying a current having a value of the DC current for a period of time less than or equal to continuous duty. The first interrupter is electrically coupled in parallel with the bypass switch. A making switch causes a cancellation current to flow from an energy source through the second interrupter, and through the first interrupter, in addition to the DC current. The AC high voltage breaker is adapted to a DC service as the DC current in addition to the cancellation current causes an arc quench which allows the AC high voltage breaker to cause the interruption of the DC current in the electrical circuit. A method for interrupting a DC current flowing in an AC high voltage circuit breaker is also described.

An electrical circuit to interrupt a DC current includes a bypass switch and an AC high voltage breaker which includes interrupters that are rated for carrying a current having a value of the DC current for a period of time less than or equal to continuous duty. The first interrupter is electrically coupled in parallel with the bypass switch. A making switch causes a cancellation current to flow from an energy source through the second interrupter, and through the first interrupter, in addition to the DC current. The AC high voltage breaker is adapted to a DC service as the DC current in addition to the cancellation current causes an arc quench which allows the AC high voltage breaker to cause the interruption of the DC current in the electrical circuit. A method for interrupting a DC current flowing in an AC high voltage circuit breaker is also described.

The invention relates to a power supply (110, 110 . . . ) for transporting electrical energy from an energy source (144) to a device (148) or from the device (148) to the energy source (144), the energy source (144) being arranged in a warm region (142) and the device (148) being arranged in a cold region (146). The power supply (110, 110) has a stack (118) comprising at least two films (120, 120 . . . ), each film (120, 120 . . . ) comprising an electrically conductive material which is designed to transport the electrical energy, ach film (120, 120 . . . ) having an electrical connection which is designed to receive the electrical energy or to deliver the electrical energy, and each film (120, 120 . . . ) comprising a plurality of flow channels (128) for conveying a fluid stream, and the fluid stream comprising a refrigerant mixture or a gas stream to be cooled or a gas stream to be liquefied. The films (120, 120, . . . ) comprised by the stack (118) have a first flow path (134) through the flow channels (128) which is designed to receive the fluid stream at a high-pressure level from the warm region (142), and a second flow path (134) through the flow channels (128) which is designed to receive the fluid stream at a low-pressure level from the cold region (146).

The invention relates to a power supply (110, 110 . . . ) for transporting electrical energy from an energy source (144) to a device (148) or from the device (148) to the energy source (144), the energy source (144) being arranged in a warm region (142) and the device (148) being arranged in a cold region (146). The power supply (110, 110) has a stack (118) comprising at least two films (120, 120 . . . ), each film (120, 120 . . . ) comprising an electrically conductive material which is designed to transport the electrical energy, ach film (120, 120 . . . ) having an electrical connection which is designed to receive the electrical energy or to deliver the electrical energy, and each film (120, 120 . . . ) comprising a plurality of flow channels (128) for conveying a fluid stream, and the fluid stream comprising a refrigerant mixture or a gas stream to be cooled or a gas stream to be liquefied. The films (120, 120, . . . ) comprised by the stack (118) have a first flow path (134) through the flow channels (128) which is designed to receive the fluid stream at a high-pressure level from the warm region (142), and a second flow path (134) through the flow channels (128) which is designed to receive the fluid stream at a low-pressure level from the cold region (146).

In a superconducting cable line in which a superconducting cable is connected to a terminal connecting part or an intermediate connecting part, an offset part in which a superconducting cable is laid in a curved-shape is provided near the terminal connecting part or the intermediate connecting part. Further, when it is assumed that the superconducting cable is movable in the offset part, an external tube of the superconducting cable is fixed such that a maximum amplitude part which maximizes the amount of movement of the superconducting cable following thermal expansion and contraction of a cable core becomes immovable.

In a superconducting cable line in which a superconducting cable is connected to a terminal connecting part or an intermediate connecting part, an offset part in which a superconducting cable is laid in a curved-shape is provided near the terminal connecting part or the intermediate connecting part. Further, when it is assumed that the superconducting cable is movable in the offset part, an external tube of the superconducting cable is fixed such that a maximum amplitude part which maximizes the amount of movement of the superconducting cable following thermal expansion and contraction of a cable core becomes immovable.