US3801723A - Structure of the terminal portion of a cable - Google Patents

Structure of the terminal portion of a cable Download PDF

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Publication number
US3801723A
US3801723A US00327949A US3801723DA US3801723A US 3801723 A US3801723 A US 3801723A US 00327949 A US00327949 A US 00327949A US 3801723D A US3801723D A US 3801723DA US 3801723 A US3801723 A US 3801723A
Authority
US
United States
Prior art keywords
bushing
chamber
conductor
leading wire
cable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00327949A
Other languages
English (en)
Inventor
I Kubo
N Shiseki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikura Ltd
Fujikura Cable Works Ltd
Original Assignee
Fujikura Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1203572A external-priority patent/JPS5148272B2/ja
Priority claimed from JP5206072A external-priority patent/JPS5514608B2/ja
Application filed by Fujikura Ltd filed Critical Fujikura Ltd
Application granted granted Critical
Publication of US3801723A publication Critical patent/US3801723A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/20—Cable fittings for cables filled with or surrounded by gas or oil
    • H02G15/22—Cable terminations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • H01F6/065—Feed-through bushings, terminals and joints
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/34—Cable fittings for cryogenic cables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Definitions

  • ABSTRACT A conductor portion of the terminal portion of a cable bushing has an inlet and outlet provided for accommodating circulation through the bushing of liquid nitrogen coolant. With the structure so arranged the conductor of the cable is led out up to a normal temperature area with a temperature gradient formed along the conductor leading wire.
  • This invention relates to a structure of the terminal portion of a cableiconductor excellent in heat insulating and electrical characteristics, in which the terminal portion of the conductor is led out up to a normal temperature area through a conductor leading wire.
  • the terminal portion of a conventional superconductive cable or very low temperature cable is so constructed that the terminal portion of a conductor is led out up to a normal temperature area through a conductor leading wire connected to the conductor.
  • the heat radiation of the conductor or the conductor leading wire is apt to be unstable depending upon the temperature conditions of an outer atmosphere with the result that the electrical characteristics, such as a dielectric strength, dielectric constant, tan 8 etc., of an insulating material used for the conductor or the conductor leading wire are disadvantageously affected to cause a temperature variation.
  • the object of this invention is to provide a structure of the terminal portion of a cable capable of leading out a conductor up to a normal temperature area in a state stable from the heat insulating and electrical viewpoint with an optimal temperature gradient formed along a conductor leading wire according to the kind of cables.
  • FIG. 1 there is shown a construction of the terminal portion of a very low temperature cable adapted to be used at a temperature approximate to about -.-200C.-
  • a cable 1 has a coolant ofliquid nitrogen 5' filled between an insulating layer 3 of a conductor 2. and a pipe 4.
  • the interior of the pipe 4 constitutes a vacuum heat insulating layer 6.
  • the terminal portion of the conductor 2 is reinforced with a reinforcedinsulating layer 7 made of such as an insulating paper, plastic insulating paper, etc., and is connected to a conductor'leading wire 8.
  • the terminal portion of the conductor 2 is encased within a terminal box 9. Within the terminal box 9 is filled liquid nitrogen coolant in communication with the interior of pipe 4a which is within pipe 4.
  • the reinforced insulating layer has the liquid nitrogen impregnated therein.
  • the conductor leading wire 8 extends through a bushing'l3 and may be led out up to a normal temperature area. Between the terminal box 9 and the bushing 13 another reinforced insulating layer 14 is arranged. Even when the terminal box and the bushing are moved closer to each other, an insulation breakage due to an along-the-surface stress can be prevented.
  • the bushing 13 has an upper inner pressure resisting reinforced barre] 16 and a lower inner pressure resisting, reinforced barrel 17; The top and bottom of the bushing are blocked by metal fittings l8 and 19 respectively.
  • inlet and outlet pipes 20 and 21 are connected to permit a coolant gaseous nitrogen 22, for example, of the order of 10 Kg/cm at 200K to be circulated in a direction indicated by arrows.
  • the conductor leading wire 8 within the bushing 13 is reinforced at its circumference with an insulating layer 15.
  • the reinforced barrel and the nitrogen coolant are used; for the section of the tank 23 the liquid nitrogen 25 and reinforced insulating layer are used; and for the section of the bushing the insulator tube, reinforced barrel 16 and reinforced insulating layer 15 areused.
  • the lower reinforced barrel 36 of the bushing and the terminal box 9 are housed within a first tank .41 in which, for example, a liquid helium gas of the order of l.5 Kg/cm 2 at 4.7K is filled as a coolant 70.
  • the coolant can be circulated through the interio'r of the tank from an inlet pipe 42 to an outlet pipe43.
  • a'yacuum heat insulating layer 45 is provided at the outside of the first tank 41 ;
  • the coolants are so placed alongthe conductor leading wire that a liquid nitrogen cooling area is formed between the liquid helium cooling area and the normal temperature area. This minimizes an increase in temperature of the liquid helium, permitting a cooling efficiency to be enhanced.
  • a optimal temperature gradient can be obtained by selecting, according to the kind of cables used, the kind of coolants and the order of their placement, the pres- 4 F 1G. 3 shows the internal structure of a bushing corresponding to the bushing of the embodiments as shown in lGS. land 2 and adapted to prevent an insulating oil within the bushing from freezing. As shown in FIG.
  • the circulation circuit is hydraulically operated by an oil pump 57 and hydraulic tank 58.
  • a heating device 59 for maintaining the temperature of the insulating oil 29 at more than the melting point when cooling is necessary before the electrical conductor of the cable conductor
  • a cooling device 60 for cooling the temperature of the insulating oil 29 when the temperature of the conductor leading wire 8 is raised to more than necessary extent at the time of the conduction of the cable conductor.
  • a heating device may be omitted.
  • the circulation circuit may be used in a form that'the cooling device 60 is omitted.
  • a coolant effect can beensaid conductor leading wire leading out from said terminal box; means associated with said bushing for accommodating a flow of gaseous nitrogen through said second chamber; an insulator tube surrounding a portion of said bushing and cooperating therewith to form 'a third chamber adapted to contain insulating oil; a
  • said structure to a normal temperature area, with a temperature gradient being maintained along the segments of said cable conductor and said conductor leading wire contained within their respective aforesaid chambers.
  • a structure of the terminal portion of a cable comprising: a conductor leading wire connected to the terminal of a cable conductor; a terminal box forming a first chamber containing the terminals of said conductor leading wire and said cable conductor; means associated with said terminal box for accommodating a flow of liquid nitrogen through said first chamber; a
  • first bushing forming a second chamber containing a segment of the conductor leading wire leading out from said terminal box; means associated with said first bushing for accommodating a flow of liquid helium through said second chamber; a first tank forming a third chamber containing a portion of said terminal box and a portion of said first bushing contained therein; means associated with said first tank for accommodating a flow of liquid helium through said third chamber; a second bushing forming a fourth chamber containing a segment of the conductor leading wire leading out from said first bushing; means associated with said second bushing for accommodating a flow of gaseous nitrogen through said fourth chamber; an insulator tube surrounding a portion of said second bushing and cooperating therewith to form a fifth chamber; means associated with said insulating tube for accommodating a flow of insulating oil through said fifth chamber; a second tank forming a sixth chamber containing portions of said first and second bushings therein; and means associated with said second tank for accommodating a flow of liquid nitrogen through said sixth chamber; whereby said conductor leading wire

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Cable Accessories (AREA)
US00327949A 1972-02-02 1973-01-30 Structure of the terminal portion of a cable Expired - Lifetime US3801723A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1203572A JPS5148272B2 (OSRAM) 1972-02-02 1972-02-02
JP5206072A JPS5514608B2 (OSRAM) 1972-05-25 1972-05-25

Publications (1)

Publication Number Publication Date
US3801723A true US3801723A (en) 1974-04-02

Family

ID=26347572

Family Applications (1)

Application Number Title Priority Date Filing Date
US00327949A Expired - Lifetime US3801723A (en) 1972-02-02 1973-01-30 Structure of the terminal portion of a cable

Country Status (3)

Country Link
US (1) US3801723A (OSRAM)
FR (1) FR2170217B1 (OSRAM)
IT (1) IT977171B (OSRAM)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900699A (en) * 1973-05-30 1975-08-19 Siemens Ag High-voltage and coolant feed apparatus for low temperature cooled conductors
US3902000A (en) * 1974-11-12 1975-08-26 Us Energy Termination for superconducting power transmission systems
US3959576A (en) * 1974-03-01 1976-05-25 Siemens Aktiengesellschaft Apparatus for supplying power to electrical devices having conductors cooled to a low temperature
EP0482840A1 (en) * 1990-10-20 1992-04-29 Westinghouse Electric Corporation Hybrid vapor cooled power lead for cryostat
US20030154727A1 (en) * 2001-02-13 2003-08-21 Yuuichi Ashibe Terminal structure of extreme-low temperature equipment
US20040256126A1 (en) * 2003-06-19 2004-12-23 Sumitomo Electric Industries, Ltd. Superconducting cable joint structure
US20130059463A1 (en) * 2010-02-04 2013-03-07 International Superconductivity Technology Center, The Judicial Foundation Cryogenic cable termination connector
US10217553B1 (en) * 2017-10-12 2019-02-26 Stock Equipment Co., Inc. Liquid containment device for bushing in liquid filled transformer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4412761C2 (de) * 1994-04-13 1997-04-10 Siemens Ag Leiterdurchführung für ein Wechselstromgerät mit Supraleitung
IT1281651B1 (it) * 1995-12-21 1998-02-20 Pirelli Cavi S P A Ora Pirelli Terminale per collegare un cavo polifase superconduttivo ad un impianto elettrico a temperatura ambiente

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704431A (en) * 1949-01-17 1955-03-22 Northrop Aircraft Inc Stable resonant circuit
US3522361A (en) * 1967-04-29 1970-07-28 Siemens Ag Electrical installation for parallel-connected superconductors
US3695057A (en) * 1969-09-30 1972-10-03 Comp Generale Electricite Cryostat current supply

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1878094A (en) * 1926-12-17 1932-09-20 Gen Cable Corp Oil-cooled terminal
FR1541809A (fr) * 1967-09-01 1968-10-11 Comp Generale Electricite Traversées électriques à forte intensité et haute tension pour cryomachines électriques

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704431A (en) * 1949-01-17 1955-03-22 Northrop Aircraft Inc Stable resonant circuit
US3522361A (en) * 1967-04-29 1970-07-28 Siemens Ag Electrical installation for parallel-connected superconductors
US3695057A (en) * 1969-09-30 1972-10-03 Comp Generale Electricite Cryostat current supply

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900699A (en) * 1973-05-30 1975-08-19 Siemens Ag High-voltage and coolant feed apparatus for low temperature cooled conductors
US3959576A (en) * 1974-03-01 1976-05-25 Siemens Aktiengesellschaft Apparatus for supplying power to electrical devices having conductors cooled to a low temperature
US3902000A (en) * 1974-11-12 1975-08-26 Us Energy Termination for superconducting power transmission systems
EP0482840A1 (en) * 1990-10-20 1992-04-29 Westinghouse Electric Corporation Hybrid vapor cooled power lead for cryostat
US6888060B2 (en) * 2001-02-13 2005-05-03 Sumitomo Electric Industries, Ltd. Terminal structure of extreme-low temperature equipment
US20030154727A1 (en) * 2001-02-13 2003-08-21 Yuuichi Ashibe Terminal structure of extreme-low temperature equipment
US20040256126A1 (en) * 2003-06-19 2004-12-23 Sumitomo Electric Industries, Ltd. Superconducting cable joint structure
US7094973B2 (en) * 2003-06-19 2006-08-22 Sumitomo Electric Industries, Ltd. Superconducting cable joint structure
US20060254804A1 (en) * 2003-06-19 2006-11-16 Sumitomo Electric Industries, Ltd. Superconducting cable joint structure
US7279639B2 (en) 2003-06-19 2007-10-09 Sumitomo Electric Industries, Ltd. Superconducting cable joint structure
US20130059463A1 (en) * 2010-02-04 2013-03-07 International Superconductivity Technology Center, The Judicial Foundation Cryogenic cable termination connector
US9728950B2 (en) * 2010-02-04 2017-08-08 Furukawa Electric Co., Ltd. Cryogenic cable termination connector
US10217553B1 (en) * 2017-10-12 2019-02-26 Stock Equipment Co., Inc. Liquid containment device for bushing in liquid filled transformer

Also Published As

Publication number Publication date
FR2170217A1 (OSRAM) 1973-09-14
IT977171B (it) 1974-09-10
FR2170217B1 (OSRAM) 1978-05-26

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