US3898367A — Particle trap for compressed-gas insulated high v…

Claim 1

Independent Claim 211 words

A compressed-gas insulated high voltage bus comprising: a. a cylindrical sheath of conductive material normally at ground potential, b. a conductor within said sheath normally at a relatively high potential with respect to said sheath, c. insulating structures within said sheath at a pair of spacedapart locations along the length of said conductor for mounting said conductor in radially spaced relationship to said sheath, d. a sheet metal liner for said sheath having a generally tubular configuration, longitudinally spaced-apart ends, and a gap extending longitudinally of said liner between said ends, e. said liner bordering the internal surface of said sheath and located between said spaced-apart insulating structures with said ends adjacent to but spaced from said insulating structures, f. said liner comprising circumferentially extending wall portions immediately adjacent said gap and a pair of spacedapart flanges bordering said gap along the gap length and extending transversely of said circumferentially extending wall portions between said circumferentially extending wall portions and said internal surface of the sheath, said flanges and the sheath portion spanning said gap defining a particle-trapping channel extending longitudinally of said sheath and in a region of low density electric field, g. said liner having a tendency to expand in diameter thereby gripping the internal wall of said sheath.

Claim 2

Dependent Claim 211 words

A compressed-gas insulated high voltage bus comprising: a. a cylindrical sheath of conductive material normally at ground potential, b. a conductor within said sheath normally at a relatively high potential with respect to said sheath, c. insulating structures within said sheath at a pair of spacedapart locations along the length of said conductor for mounting said conductor in radially spaced relationship to said sheath, d. a sheet metal liner for said sheath having a generally tubular configuration, longitudinally spaced-apart ends, and a gap extending longitudinally of said liner between said ends, e. said liner bordering the internal surface of said sheath and located between said spaced-apart insulating structures with said ends adjacent to but spaced from said insulating structures, f. said liner comprising circumferentially extending wall portions immediately adjacent said gap and a pair of spacedapart flanges bordering said gap along the gap length and extending transversely of said circumferentially extending wall portions between said circumferentially extending wall portions and said internal surface of the sheath, said flanges and the sheath portion spanning said gap defining a particle-trapping channel extending longitudinally of said sheath and in a region of low density electric field, g. said liner having a tendency to expand in diameter thereby gripping the internal wall of said sheath.

Claim 3

Dependent Claim 62 words

The structure of claim 1 in combination with: a. conductive shielding of annular configuration mounted on said sheath and extending radially inward therefrom adjacent one of said insulating structures, b. said shielding being located between an end of said liner and the insulating structure thereadjacent and having a rounded portion that generally overlaps said end and provides an electrostatic about said end.

Claim 4

Dependent Claim 133 words

The structure of claim 1 in combination with: a. an additional sheet metal liner of tubular configuration mounted within said sheath in bordering relationship to the internal surface of said sheath in a position spaced longitudinally of said bus from the first of said liners, one of said insulating structures being of annular form and located between the ends of said liners in a position adjacent said ends but spaced therefrom, b. conductive shielding structures of annular configuration mounted on said sheath and extending radially inward therefrom adjacent said one insulating structure, c. said shielding structures being located between the respective ends of said liners and said one insulating structure, each shielding structure having a rounded portion that generally overlaps the associated liner end and provides an electrostatic shield about said associated end.

Claim 5

Dependent Claim 150 words

The structure of claim 1 in which: a. at least one of said insulating structures comprises a disc of insulating material surrounding said conductor and having its outer periphery spaced radially inward from said cylindrical sheath, b. a metallic grading ring surrounds said outer periphery and extends radially outward to the sheath, c. conductive shielding structures of annular configuration Are mounted on said sheath at opposite sides of said grading ring in positions spaced longitudinally of said bus from said grading ring to provide generally annular wells of low density electric field between said shielding structures at opposite sides of said grading ring, d. one of said shielding structures is located between an end of said liner and the insulating disc thereadjacent, and e. said one shielding structure has a rounded portion that generally overlaps the adjacent end of said liner and provides an electrostatic shield about said adjacent end.

Claim 6

Dependent Claim 121 words

The structure of claim 4 in which: a. an additional sheet metal liner of tubular configuration is mounted within said sheath in bordering relationship to the internal surface of said sheath in a position spaced longitudinally of said bus from the first of said liners, b. said one insulating structure is located between the ends of said liners in a position adjacent said ends but spaced therefrom, c. the other of said shielding structures is located between the end of said additional liner and said one insulating structure, and d. said other shielding structure has a rounded portion that generally overlaps the adjacent end of said additional liner and provides an electrostatic shield about said adjacent end of said additional liner.

Claim 7

Dependent Claim 143 words

The structure of claim 1 in which: a. at least one of said insulating structures comprises a disc of insulating material surrounding said conductor and having a metallic grading ring at its outer periphery extending radially outward to said sheath, b. conductive shielding structures of annular configuration are mounted on said sheath at opposite sides of said grading ring in positions spaced longitudinally of said bus from said grading ring to provide between said shielding structures at opposite sides of said grading ring generally annular wells of low density electric field into which loose particles are attracted, c. one of said shielding structures is located between one end of said liner and the insulating disc thereadjacent, and d. said one shielding structure has a rounded portion that generally overlaps the adjacent end of said liner and provides an electrostatic shield about said end.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-08-04	1979-02-03	1979-08-05	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-08-04	1983-02-03	1983-08-05	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-08-04	1987-02-03	1987-08-05	$7700.00	Window Closed / Lapsed

Particle trap for compressed-gas insulated high voltage bus

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