End closure of a superconductive electric cable

Patent metadata

Field	Value
Publication number	US-10453591-B2
Application number	US-201514632170-A
Country	US
Kind code	B2
Filing date	Feb 26, 2015
Priority date	Mar 11, 2014
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

An end closure for a superconductive electric cable which has at least one superconductive conductor which is surrounded by a tubular cryostat serving for conducting a cooling agent, which at its end is surrounded by a housing. The housing (G) has two walls ( 7, 8 ) which are separated from each other by an intermediate space ( 9 ) and having insulating material, wherein a thermal insulation containing gas is placed in the intermediate space. The pressure in the intermediate space ( 9 ) of the housing (G) is adjusted to a value of between 10 −9 mbar and 1000 mbar and, connected to the intermediate space ( 9 ) are a pressure measuring device ( 12 ) and a vacuum pump ( 11 ) which serve for adjusting the pressure prevailing in the intermediate space ( 9 ) of the housing (G).

First claim

The invention claimed is:

1. An end closure for a superconductive electrical cable, said superconductive electrical cable having at least one superconductive conductor and being surrounded by a tubular metal cryostat containing a cooling agent, said cryostat terminating in an expansion of said cryostat, said end closure comprising:
a housing made of two walls separated from each other by an intermediate space, the walls being made of insulating material, and where said intermediate space is filled with an insulating gas cooling agent, said end closure being sealed to an outside of said expansion of said cryostat,
wherein said housing surrounds an end of said superconductive conductor that extends outside of said cryostat beyond said expansion of said cryostat, and through which a bushing connected to the conductor extends outwardly, wherein:
a pressure in the intermediate space of the housing is set at a value between 10 −9 mbar and 1000 mbar,
the intermediate space is connected to a container whose volume is larger as compared to the volume of the gas contained in the intermediate space,
a pressure measuring device and a vacuum pump connected to the measuring device are connected to the intermediate space, which serve for adjusting the pressure to a predetermined value prevailing in the intermediate space of the housing, and
the container is arranged between the housing and the vacuum pump.

2. End closure according to claim 1 , wherein the volume of the container is larger at least by the factor “10” of the volume of the gas contained in the intermediate space of the housing.

3. End closure according to claim 1 , wherein the vacuum pump is connected to the intermediate space through a pipeline.

4. End closure according to claim 3 , wherein a valve is arranged in the pipeline.

5. End closure according to claim 1 , wherein the container and the vacuum pump are connected to each other through a pipeline.

6. End closure according to claim 5 , wherein a valve is arranged in the pipeline.

7. End closure according to claim 1 , wherein the insulating gas cooling agent contained in the intermediate space of the housing is of same type as said cooling agent present in the cryostat.

Assignees

• Nexans

Inventors

• Marzahn Erik
• Stemmle Mark

Classifications

• H02G15/34 Primary

  Cable fittings for cryogenic cables {(superconductive cables per se H01B12/00)} · CPC title

• H01R4/68 Primary

  Connections to or between superconductive connectors · CPC title

• F17C3/085

  Cryostats · CPC title

• H02G15/043

  with end caps, e.g. sleeve closed at one end · CPC title

• H01B12/16 Primary

  characterised by cooling · CPC title