High voltage cable

• US 4,294,504 A
• Filed: 07/13/1979
• Issued: 10/13/1981
• Est. Priority Date: 07/13/1978
• Status: Expired due to Term

• Current Assignee: Karlsruhe Institute of Technology
• Original Assignee: Kernforschungszentrum Karlsruhe GmbH
• Inventors: Siewerdt, Lothar
• Primary Examiner(s): Abrams, Neil
• Application Number:
  US06/057,373
• Time in Patent Office: 823 Days
• Field of Search: 339/177 R, 339/177 E, 339/218 R, 339/132 R, 174/15 CA, 174/102 R, 174/103, 174/107, 174/115, 174/116
• US Class Current: 439/569
• CPC Class Codes: H01B 12/02 characterised by their form
• CPC Class Codes: H01B 9/00 Power cables
• CPC Class Codes: H01B 9/04 Concentric cables
• CPC Class Codes: H02G 15/34 Cable fittings for cryogenic cables superconductive cables per se H01B12/00
• CPC Class Codes: Y02E 40/60 Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Abstract

A high voltage cable wherein each conductive element comprises a flexible inner conductor, an insulating sheath within which the inner conductor moves freely, a flexible outer conductor encasing the insulating sheath and an insulating jacket which encases the outer and inner conductors. The cable may consist of one conductive element or a plurality of conductive elements distributed symmetrically in groups over a circular cross-sectional area.

Claims

1. A high voltage cable for transmitting current pulses up to 10 kiloamperes at temperatures in the range from 4°

K. to 300°

K., said cable comprising;

a plurality of conductive elements distributed symmetrically, in groups, over a circular cross-sectional area, each element including;

a flexible inner conductor;

an insulating sheath surrounding said inner conductor, said inner conductor moving freely within said insulating sheath;

a flexible outer conductor encasing said insulating sheath, the cross-sectional area of said outer conductor being relatively small compared to that of said inner conductor, said inner and outer conductors being electrically conductively connected together; and

a first glass tape wrap encasing said outer conductor and insulating sheath without the formation of gas bubbles therein;

glass tape filling the interstices between the conductive elements in each of said groups;

glass fiber reinforced filler pieces filling the interstices between groups of conductive elements;

a second glass tape wrap enclosing said groups of conductive elements, and

a shield enclosing said second glass tape wrap.

2. A high voltage cable and support therefor for transmitting current pulses up to 10 kiloamperes at temperatures in the range from 4°

K. to 300°

K.,

said cable comprising at least one conductive element including;

a flexible inner conductor;

an insulating sheath surrounding said inner conductor, said inner conductor moving freely within said insulating sheath;

a flexible outer conductor encasing said insulating sheath, the cross-sectional area of said outer conductor being relatively small compared to that of said inner conductor, said inner and outer conductors being electrically conductively connected together; and

an insulating jacket encasing said outer conductor and insulating sheath without the formation of gas bubbles within said insulating jacket; and

said support structure comprising a plug-in coupling including;

a cast resin block having a plurality of said conductive elements encased therein;

a soldering sleeve having a threaded opening therein positioned within the bore in said block, said inner conductor being soldered within the opening of said soldering sleeve and said insulating jacket surrounding said sleeve;

an annular flange enclosing said block; and

a contact pin threaded into the opening of said soldering sleeve.

3. A high voltage cable and support structure as defined in claim 2 wherein said insulating jacket is a glass tape wrap.

4. A high voltage cable and support structure as defined in claim 2 wherein said support structure includes a terminating closure comprising:

a cylindrical insulating body having a longitudinal bore therein for accommodating said cable, said insulating jacket consisting of a glass tape wrap extending approximately one-half of the length of the bore in said insulating body and a first insulating tube extending for the remainder of the length of said bore and beyond the end of said cylindrical insulating body, said first insulating tube having a diameter which is less than the diameter of the bore in said insulating body; and

a cast resin body for encasing said first insulating tube.

5. A high voltage cable and support structure therefor for transmitting current pulses up to 10 kiloamperes at temperatures in the range from 4°

K. to 300°

K.,

said cable comprising at least one conductive element including;

a flexible inner conductor;

an insulating sheath surrounding said inner conductor, said inner conductor moving freely within said insulating sheath;

a flexible outer conductor encasing said insulating sheath, the cross-sectional area of said outer conductor being relatively small compared to that of said inner conductor, said inner and outer conductors being electrically conductively connected together; and

an insulating jacket encasing said outer conductor and insulating sheath without the formation of gas bubbles within said insulating jacket; and

said support structure comprising a terminating closure including;

a cylindrical insulating body having a longitudinal bore therein for accommodating said cable, said insulating jacket consisting of a glass tape wrap extending to its termination at approximately one-half of the length of the bore in said insulating body and a first insulating tube extending for the remainder of the length of said bore and beyond the end of said cylindrical insulating body, said first insulating tube having a diameter which is less than the diameter of the bore in said insulating body; and

a cast resin body for encasing said first insulating tube.

6. A high voltage cable and support structure as defined in claim 5 wherein said inner and outer conductors extend beyond the ends of said insulating sheath and said first insulating tube, said inner and outer conductors being electrically conductively connected together by means of a solder connection.

7. A high voltage cable and support structure as defined in claim 6 which further comprises a high voltage connecting cable having a conductor electrically connected to the solder connection of said inner and outer conductors, a second insulating tube surrounding the conductor of said connecting cable and an insulating sleeve surrounding said first and second insulating tubes and said solder connection.