US1539490A - Manufacture of electric cables - Google Patents
Manufacture of electric cables Download PDFInfo
- Publication number
- US1539490A US1539490A US606714A US60671422A US1539490A US 1539490 A US1539490 A US 1539490A US 606714 A US606714 A US 606714A US 60671422 A US60671422 A US 60671422A US 1539490 A US1539490 A US 1539490A
- Authority
- US
- United States
- Prior art keywords
- core
- cable
- cooling
- tube
- manufacture
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/06—Gas-pressure cables; Oil-pressure cables; Cables for use in conduits under fluid pressure
- H01B9/0611—Oil-pressure cables
Definitions
- this insulating composition shall be of such a nature that it is ysolid or semi-solid when cold, but when heated to the requisite temperature it ⁇ must be suiiiciently liquid to penetrate the paper insulation.
- the cooling process is allowed to commence and hitherto the cooling of the cable itself has necessarily started from the outside. In other words there is always during cooling a temperature gradient from the core or inner portion of the cable to the outer portion. Consequently as the cooling continues, a stage is reached when the insulating composition in or surrounding the outer portion of the cable is at such a temperato How or penetrate the paper.
- the core and inner layers of insulation are, however, still relatively hot and as they cool, the insulating composition around and in themy decreases iny volume and cannot be replenished, at anyvrate to the full extent, from outside owing to the viscosity of the comparatively cool composition. As a result the impregnation is not so effective as it might otherwise be.
- this disadvantage is obviated by cooling the core of the cable atan appropriate stage in the impregnating process lso that the cooling of the composition takes place, at any rate partly, from inside.
- the core being definitely cooler than the outside of the cable but in all cases the effect of the cooling of the core is at any rate to lessen or neutralise the gradient now always presenta Y Vusual in such cables.
- the cable In order that it may be possible thus to cool the core and inner portions of the cable it is preferred to provide the cable with a tube through which a cooling Inedium may be passed.
- This tube may conveniently be of copper and in close contact with the conductors forming the core.
- F or instance stranded conductors may be laid up round a lcentral conducting tube which thus itself acts as part of the core. Again the whole core may in some instances form the tube or be constituted by it'.
- the cross sectional area of the bore of the tube may be say 20% of the total cross sectional area of the conductors.
- Figures l and 2 are respectively an elevation and a cross section of one construction of electric cab-le according to this invention.
- Figures 3 and 4 are similar views of an alternative construction of cable also according to this invention. n
- the conducting core is formed partly by a tube A, preferably of copper, and partly by stranded conductors B laid up round the tube A in close contact with it.
- the insulation C surrounding each. conducting core is preferably of paper or some insulating material which, after being wound round the core in some wellknown way, is impregnated in the manner
- the outer insulation and covering E may be Vof any' known form andv do not in themselves form part of the present invention.
- the conducting core consists solely of the tube A.
- any convenient cooling medium is passed through the tube A or A.
- Such medium may if desired be an insulating liquid. This however is not essential for no passage of the cooling medium into the insulation of the cable is possible and it is convenient to use refrigerated brine.
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- Insulated Conductors (AREA)
Description
P. V. HUNTER MANUFACTURE OF ELECTRIC CABLES May 26, 192s.` 1,539,490
Filed Dec, 13, 1922 E vl/emot:
Patented May-26, 1925.
UNITED y STATESv 1,539,490 PATENT OFFICE.
PHILIP VASSAR HUNTER, OF LONDON, ENGLAND.
MANUFACTURE or ELECTRIC CABLES.
Application filed December 13, 1922. Serial No. 606,714.
To aZZ 'whom t mag/concern."
Be it. known that I, PHILIP VAssAR HUN- TER, a subject of the King ofEngland, and
. sulated say by pap-er wound round the conture that it is no longer suiiiciently liquidl ducting core, are impregnated or .immersed in a hot insulating composition.
" For Various reasons it is desirable that this insulating composition shall be of such a nature that it is ysolid or semi-solid when cold, but when heated to the requisite temperature it \must be suiiiciently liquid to penetrate the paper insulation. After the process of impregnation in the hot composition has proceeded for avsuflicient time the cooling process is allowed to commence and hitherto the cooling of the cable itself has necessarily started from the outside. In other words there is always during cooling a temperature gradient from the core or inner portion of the cable to the outer portion. Consequently as the cooling continues, a stage is reached when the insulating composition in or surrounding the outer portion of the cable is at such a temperato How or penetrate the paper. The core and inner layers of insulation are, however, still relatively hot and as they cool, the insulating composition around and in themy decreases iny volume and cannot be replenished, at anyvrate to the full extent, from outside owing to the viscosity of the comparatively cool composition. As a result the impregnation is not so effective as it might otherwise be.
According to the present invention this disadvantage is obviated by cooling the core of the cable atan appropriate stage in the impregnating process lso that the cooling of the composition takes place, at any rate partly, from inside. As compared with the usual practice there is preferably an actual reversal of the temperature gradient, the core being definitely cooler than the outside of the cable but in all cases the effect of the cooling of the core is at any rate to lessen or neutralise the gradient now always presenta Y Vusual in such cables.
In order that it may be possible thus to cool the core and inner portions of the cable it is preferred to provide the cable with a tube through which a cooling Inedium may be passed. This tube may conveniently be of copper and in close contact with the conductors forming the core.
F or instance stranded conductors may be laid up round a lcentral conducting tube which thus itself acts as part of the core. Again the whole core may in some instances form the tube or be constituted by it'. When the tube is surrounded by the stranded conductors forming the core, the cross sectional area of the bore of the tube may be say 20% of the total cross sectional area of the conductors.
In the accompanying drawings,
Figures l and 2 are respectively an elevation and a cross section of one construction of electric cab-le according to this invention, and
Figures 3 and 4 are similar views of an alternative construction of cable also according to this invention. n
Each of these constructions is given by wayof example only.
In both examples three-phase cables are shown but obviously the invention may be applied to other cables.
In Figures 1 and 2 the conducting core is formed partly by a tube A, preferably of copper, and partly by stranded conductors B laid up round the tube A in close contact with it. The insulation C surrounding each. conducting core is preferably of paper or some insulating material which, after being wound round the core in some wellknown way, is impregnated in the manner The outer insulation and covering E may be Vof any' known form andv do not in themselves form part of the present invention.
In the example shown. in Figures 3 and i the conducting core consists solely of the tube A.
After each of the cables formed by the core A B or A and the insulation C has ingprocess isto be commenced any convenient cooling medium is passed through the tube A or A. Such medium may if desired be an insulating liquid. This however is not essential for no passage of the cooling medium into the insulation of the cable is possible and it is convenient to use refrigerated brine.
It is to be understood that it is not essential for the carrying out of this invention thatl the Whole cooling of the cable 'shall proceed from the inside. In some impregnatmg processes the cooling of the 1n-L sulating composition is hastened by causing a cooling medium' to be circulated through tubes immersed in the composition and such a method may be used in conto secure by Letters Patent isz- A method of impregnatinr the insulation of an electric cable in which after the impregnation process has proceeded for a sufficient time the core or conductor is cooled by means of a cooling medium, such for example as refrigerated brine passed through the interior of the cable.
In testimony whereof I have signed my name to this specification.
PHILIP VASSAR HUNTER.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US606714A US1539490A (en) | 1922-12-13 | 1922-12-13 | Manufacture of electric cables |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US606714A US1539490A (en) | 1922-12-13 | 1922-12-13 | Manufacture of electric cables |
Publications (1)
Publication Number | Publication Date |
---|---|
US1539490A true US1539490A (en) | 1925-05-26 |
Family
ID=24429155
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US606714A Expired - Lifetime US1539490A (en) | 1922-12-13 | 1922-12-13 | Manufacture of electric cables |
Country Status (1)
Country | Link |
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US (1) | US1539490A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2914598A (en) * | 1957-04-17 | 1959-11-24 | Thomas F Spillane | Apparatus for cooling a welding cable |
US3106600A (en) * | 1960-06-13 | 1963-10-08 | Gen Electric | Liquid cooled transmission line |
US4112247A (en) * | 1976-09-20 | 1978-09-05 | Western Electric Company, Inc. | Gas feeder pipe assembly including electrical conductors |
US20050067159A1 (en) * | 2003-09-25 | 2005-03-31 | Hall David R. | Load-Resistant Coaxial Transmission Line |
US20230035457A1 (en) * | 2021-07-30 | 2023-02-02 | Aptiv Technologies Limited | Power cable assembly for a power distribution system having an integrated cooling system |
-
1922
- 1922-12-13 US US606714A patent/US1539490A/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2914598A (en) * | 1957-04-17 | 1959-11-24 | Thomas F Spillane | Apparatus for cooling a welding cable |
US3106600A (en) * | 1960-06-13 | 1963-10-08 | Gen Electric | Liquid cooled transmission line |
US4112247A (en) * | 1976-09-20 | 1978-09-05 | Western Electric Company, Inc. | Gas feeder pipe assembly including electrical conductors |
US20050067159A1 (en) * | 2003-09-25 | 2005-03-31 | Hall David R. | Load-Resistant Coaxial Transmission Line |
US6982384B2 (en) * | 2003-09-25 | 2006-01-03 | Intelliserv, Inc. | Load-resistant coaxial transmission line |
US20230035457A1 (en) * | 2021-07-30 | 2023-02-02 | Aptiv Technologies Limited | Power cable assembly for a power distribution system having an integrated cooling system |
US11935672B2 (en) * | 2021-07-30 | 2024-03-19 | Aptiv Technologies AG | Power cable assembly for a power distribution system having an integrated cooling system |
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