Bus incorporating current limiting reactance

Claim 2

In a bus duct run incorporating a current limiting reactor: a rigid, conductive, tubular enclosure; a rigid tubular conductor located inside said enclosure; insulators supporting said conductor in spaced relation to said enclosure; said tubular conductor having a portion along its length consisting of a helix having spaced-apart turns electrically connected in series with each other for conducting the current flowing in the tubular conductor, said helical portion serving as a reactor for current limiting purposes, both said enclosure and said conductor being generally circular in cross section and being generally coaxial, the portion of said enclosure surrounding the helical portion of said tubular conductor having its circular configuration interrupted by insulating means along its length that interrupts the current conductive paths around said enclosure portion.

Claim 3

In a bus duct run incorporating a current limiting reactor: a rigid, conductive, tubular enclosure; a rigid tubular conductor located inside said enclosure; insulators supporting said conductor in spaced relation to said enclosure; said tubular conductor having a portion along its length consisting of a helix having spaced-apart turns electrically connected in series with each other for conducting the current flowing in the tubular conductor, said helical portion serving as a reactor for current limiting purposes, both said enclosure and said conductor being generally circular in cross-section and being generally coaxial, and support means for said helical conductor portion comprising: a. an insulating tube located coaxially inside said helical conductor portion and supported by the portions of said tubular conductor at opposite ends of said helical portion, and b. a plurality of insulating ribs secured to and projecting radially outwardly from said insulating tube into contact with said helical conductor portion, said ribs extending longitudinally of said insulating tube and in circumferentially-spaced relationship to each other about the periphery of said insulating tube.

Claim 4

In a bus duct run incorporating a current limiting reactor: a rigid, conductive, tubular enclosure; a rigid tubular conductor located inside said enclosure; insulators supporting said conductor in spaced relation to said enclosure; said tubular conductor having a portion along its length consisting of a helix having spaced-apart turns electrically connected in series with each other for conducting the current flowing in the tubular conductor, said helical portion serving as a reactor for current limiting purposes, both said enclosure and said conductor being generally circular in cross-section and being generally coaxial, and support means for said helical conductor portion comprising: a. an insulating tube located coaxially inside said helical conductor portion and supported by the portions of said tubular conductor at opposite ends of said helical portion, and b. a plurality of insulating ribs secured to and projecting radially outwardly from said insulating tube into contact with said helical conductor portion, said ribs extending longitudinally of said insulating tube and in circumferentially-spaced relationship to each other about the periphery of said insulating tube.

Claim 5

The bus duct run of claim 2 in which said ribs space said insulating tube from said helical conductor portion, thus providing ducts between said ribs along the internal surface of said helical conductor portion, and means is provided for driving cooling air through said ducts and through the space between said helical conductor portion and said surrounding enclosure, thereby cooling said helical conductor portion.

Claim 6

The bus duct run of claim 3 in which said portions of the tubular conductor at opposite ends of said helical conductor portion are of smaller diameter than said helical conductor portion, thus providing open spaces at opposite ends of said helical portion through which cooling air may freely enter and leave said ducts.

Claim 7

In a bus duct run incorporating a current limiting reactor: a rigid, conductive, tubular enclosure; a rigid tubular conductor located inside said enclosure; insulators supporting said conductor in spaced relation to said enclosure; said tubular conductor having a portion along its length consisting of a helix having spaced-apart turns electrically connected in series with each other for conducting the current flowing in the tubular conductor, said helical portion serving as a reactor for current limiting purposes, and a tube of insulating material located coaxially inside said helical conductor portion and supporting said helical conductor portion against displacement.

Claim 8

In a bus duct run incorporating a current limiting reactor: a rigid, conductive, tubular enclosure; a rigid tubular conductor located inside said enclosure; insulators supporting said conductor in spaced relation to said enclosure; said tubular conductor having a portion along its length consisting of a helix having spaced-apart turns electrically connected in series with each other for conducting the current flowing in the tubular conductor, said helical portion serving as a reactor for current limiting purposes, and a tube of insulating material located coaxially inside said helical conductor portion and supporting said helical conductor portion against displacement.