Patent US3553342A successfully refreshed from Google Patents.
US3553342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric cable installations and joints therefor
Assignee: Balfour Beatty PLC
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Filing: 1968-02-13
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Granted: 1971-01-05
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Expires: 1988-02-13
Abstract
Abstract In a joint for an electric power cable, especially a fluidfilled cable, short lengths of cable adjacent to the built-up joint structure are cooled by circulating fluid. The short lengths, which may be sheathed or unsheathed, may project into an elongated fluid-tight enclosure surrounding the joint structure and through which dielectric fluid circulates. Alternatively supplementary enclosures for the short lengths may be located adjacent to the main enclosure and fluid circulated through the supplementary enclosures and a heat exchanger or exchangers.
Inventors
- 👤 Michael Savvas Papadopulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:28
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/20; H02G15/24
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
65 words
A joint in a sheathed electric power cable comprising an enclosure sealed at at least one end to the cable sheath, and surrounding a short length of cable adjacent to the joint, cooling fluid for the cable which circulates through the enclosure external cooling means for the fluid and means for causing the fluid to circulate through the enclosure and through the external cooling means.
Claim 2
Dependent Claim
65 words
A joint in a sheathed electric power cable comprising an enclosure sealed at at least one end to the cable sheath, and surrounding a short length of cable adjacent to the joint, cooling fluid for the cable which circulates through the enclosure external cooling means for the fluid and means for causing the fluid to circulate through the enclosure and through the external cooling means.
Claim 3
Dependent Claim
25 words
A joint as claimed in claim 1 in which each of the short lengths of cable is greater than 9 inches plus one cable diameter.
Claim 4
Dependent Claim
25 words
A joint as claimed in claim 1 in which each of the short lengths of cable is sheathed over the greater part of its length.
Claim 5
Dependent Claim
22 words
A joint as claimed in claim 1 in which the cooling fluid for each short length is caused to circulate by convection.
Claim 6
Dependent Claim
34 words
A joint as claimed in claim 1 in which the cable is a fluid filled cable and the cooling fluid for cooling each short length of cable is the dielectric fluid of the cable.
Claim 7
Dependent Claim
87 words
A joint is in a sheathed electric power cable comprising a fluid-tight enclosure sealed to the sheaths of cable lengths connected at the joint and enclosing the connection between the cable conductors, the enclosure being extended at at least one end to enclose a short length of the cable, cooling fluid for the cable which circulates through each extended part of the enclosure and means for causing said cooling fluid to circulate through each extended part of the enclosure and through external cooling means for the fluid.
Claim 8
Dependent Claim
87 words
A joint is in a sheathed electric power cable comprising a fluid-tight enclosure sealed to the sheaths of cable lengths connected at the joint and enclosing the connection between the cable conductors, the enclosure being extended at at least one end to enclose a short length of the cable, cooling fluid for the cable which circulates through each extended part of the enclosure and means for causing said cooling fluid to circulate through each extended part of the enclosure and through external cooling means for the fluid.
Claim 9
Dependent Claim
28 words
A joint as claimed in claim 6 in which each extended end part of the enclosure is of smaller cross section than the central part of the enclosure.
Claim 10
Dependent Claim
26 words
A joint as claimed in claim 6 in which each of the short lengths of the cable is greater than 9 inches plus one cable diameter.
Claim 11
Dependent Claim
25 words
A joint as claimed in claim 6 in which each of the short lengths of cable is sheathed over the greater part of its length.
Claim 12
Dependent Claim
22 words
A joint as claimed in claim 6 in which the cooling fluid for each short length is caused to circulate by convection.
Claim 13
Dependent Claim
49 words
A joint as claimed in claim 6 in which the cable is a fluid filled cable aNd means is provided for causing the dielectric fluid to circulate through the whole length of the enclosure, including each extended part of the enclosure, and through external cooling means for the fluid.
Claim 14
Dependent Claim
87 words
A joint in a sheathed electric power cable comprising a fluid-tight enclosure sealed to the sheaths of cable lengths connected at the joint and enclosing the connection between the cable conductors and, surrounding a short length of the cable adjacent to at least one end of said enclosure, a supplementary fluid-tight enclosure, cooling fluid for the cable which circulates through said supplementary fluid-tight enclosure, external cooling means for the fluid and means for causing the fluid to circulate through said supplementary enclosure and the external cooling means.
Claim 15
Dependent Claim
87 words
A joint in a sheathed electric power cable comprising a fluid-tight enclosure sealed to the sheaths of cable lengths connected at the joint and enclosing the connection between the cable conductors and, surrounding a short length of the cable adjacent to at least one end of said enclosure, a supplementary fluid-tight enclosure, cooling fluid for the cable which circulates through said supplementary fluid-tight enclosure, external cooling means for the fluid and means for causing the fluid to circulate through said supplementary enclosure and the external cooling means.
Claim 16
Dependent Claim
25 words
A joint as claimed in claim 12 in which each of the short lengths of cable is greater than 9 inches plus one cable diameter.
Claim 17
Dependent Claim
25 words
A joint as claimed in claim 12 in which each of the short lengths of cable is sheathed over the greater part of its length.
Claim 18
Dependent Claim
22 words
A joint as claimed in claim 12 in which the cooling fluid for each short length is caused to circulate by convection.
Claim 19
Dependent Claim
34 words
A joint as claimed in claim 12 in which the cable is a fluid filled cable and the cooling fluid for cooling each short length of cable is the dielectric fluid of the cable.
Claim 20
Dependent Claim
39 words
A joint as claimed in claim 12 for a cross bonded cable system in which supplementary enclosures at each end of the joint are electrically isolated from each other and separate external cooling means are provided for each enclosure.
Claim 21
Dependent Claim
37 words
A joint as claimed in claim 12 in which the cooling fluid which circulates through the or each supplementary enclosure is different from a dielectric fluid filling the fluid-tight enclosure enclosing the connection between the cable conductor.
References Cited (Backward Citations)
US2163783A
Cited
US2053163A
Cited
US1979150A
Cited
US3111551A
Cited
GB1076355A
Cited
US3406245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |