US3843830A - Electric cable with corrugated sheath and semi-conductive protective layer between the sheath and the core - Google Patents
Electric cable with corrugated sheath and semi-conductive protective layer between the sheath and the core Download PDFInfo
- Publication number
- US3843830A US3843830A US00403962A US40396273A US3843830A US 3843830 A US3843830 A US 3843830A US 00403962 A US00403962 A US 00403962A US 40396273 A US40396273 A US 40396273A US 3843830 A US3843830 A US 3843830A
- Authority
- US
- United States
- Prior art keywords
- sheath
- core
- tube
- corrugations
- cable
- 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
Links
- 239000011241 protective layer Substances 0.000 title description 2
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 31
- 239000004020 conductor Substances 0.000 claims abstract description 24
- 239000004744 fabric Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 32
- 238000012216 screening Methods 0.000 claims description 30
- 239000011810 insulating material Substances 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 12
- 238000010008 shearing Methods 0.000 claims description 11
- 239000003365 glass fiber Substances 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000011343 solid material Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000013021 overheating Methods 0.000 description 3
- 229910018503 SF6 Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 description 2
- 241001602730 Monza Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
Definitions
- the present invention relates to improvements in electric cables provided with a metal sheath, in particular, a corrugated aluminum sheath, and of the type described in co-pending application Ser. No. 162,199, filed July 13, 1971, and entitled ELECTRIC CABLE WITH CORRUGATED METALLIC SHEATH, now U.S. Pat. No. 3,766,309.
- the invention is applicable to high voltage power cables and especially to Millikentype cables.
- U.S. Pat. No. 3,766,309 describes an electric cable comprising a core, i.e., a conductor surrounded throughout its length by at least one layer of insulating material, which is surrounded by a corrugated metal sheath.
- a soft tubular covering generally of the order of about one or more millimeters in radial dimension, covers said core, the corrugations of the sheath, at least for a part of their depth, penetrating into said soft tubular covering in order to provide a co-penetration of the latter and the sheath.
- a preferred embodiment of the invention illustrated in said patent is an electric cable comprising a core contained in a corrugated metal sheath, in which said soft tubular covering for the core is made of crepe paper.
- the possible slippage of the core with respect to the sheath, when the cable is installed in vertical direction, is substantially prevented.
- the soft tubular covering in particular when it is made of crepe paper, has provided, in practice, very suitable for the dissipation of heat in the case of power cables subjected to thermal cycles, thereby avoiding undesired over-heating of the dielectric.
- the principal object of the invention of the present application is to provide an electric cable having a corrugated metal sheath which is improved with respect to the electric cable described in said patent, the improvement being also applicable to high voltage power cables, in particular, to Milliken-type cables, and the improvement substantially eliminating the hereinforementioned disadvantages.
- the object of the present invention is an improved electric cable comprising a core contained in a corrugated metal sheath, and of the type disclosed in said application, in which a soft tubular covering surrounds said core, the corrugations of the sheath, at least for a part of their depth, penetrating in said soft tubular covering so as to provide a co-penetration between the latter and the sheath, said cable being characterized in that said soft tubular covering is constituted by a material having a high electric conductivity with respect to a dielectric material.
- the electric cable, said soft tubular covering, made of a material having a high electric conductivity is constituted by a winding of tapes of semi-conductive crepe paperfl-w-
- said soft tuv bular covering, made of a material having a high electric conductivity is constituted by an internal winding of tapes of semi-conductive crepe paper and by an external winding of a cloth of glass fibers containing intercalated metal wires.
- FIG. 1 represents, in longitudinal section, a single core, power cable having a core surrounded by a corrugated metal sheath and having an intermediate layer of semi-conductive crepe paper;
- FIG. 2 represents, in longitudinal section, a Millikentype cable, provided with a corrugated aluminum sheath and a composite intermediate layer of semiconductive crepe paper and a cloth of glass fibers containing intercalated metal wires.
- the cable represented in longitudinal section in FIG. 1 is a single core cable and comprises a core 10 and a corrugated sheath 1].
- the sheath 11 illustrated in FIG. 1 has helical corrugations, the corrugations could be annular.
- the core 10 comprises a stranded conductor 12, on which is wound a first, or internal, semi-conductive screen 13 surrounded by a dielectric layer 14, which, in turn, is surrounded by a second, or external, semi-conductive screen 15.
- the core 10 is electrically complete, that is, except for the need to protect it from physical damage with a sheath 1 l, the core 10 may be used for carrying current between separated points.
- the core 10 is protected from damage by the sheath 11, both during the application of the sheath 11 and during subsequent use and is prevented from slipping with respect to the sheath 1 1 by a soft tubular covering or layer 16, made of a material having a high electric conductivity as compared to ordinary insulation, e.g., it has a resistivity, MD, of from 30 to 5,000 ohm cm. and a bulk resistivity of from 3,000 to 500,000 ohm cm.
- the covering 16 is constituted by a helical winding of tapes of semiconductive crepe paper thereby forming a tube of solid, self-sustaining and resilient material between the sheath 1] and the core 10.
- the material of the covering 16 is different from the material of the layer 14 and is softer than the latter so as to permit deformation of the sheath 11 without substantial deformation of the layer 14.
- the covering 16 frictionally engages the external screen 15 and the sheath 11, at least partially filling the corrugations of the sheath 11, and thereby prevents significant relative movement between the sheath 1 l and the core 10 when the cable is suspended by the sheath 11.
- the shear strength of the covering 16 is such that it can prevent such relative movement without shearing of the covering 16 or the material thereof.
- the normal exterior size of the covering 16 in the absence of deformation thereof is greater than the minimum diameter of the corrugations of the sheath 11.
- the inner surface 16 of the soft, tubular, conductive covering 16 is in contact with the external semiconductive screen 15, and the outer surface 18 of said covering 16 is in contact with the internal surface of the corrugated sheath 11, at least along a helical surface in the form of a generally cylindrical helix of circular section,
- the cable illustrated in FIG. 2 is of the type known to those skilled in the art as a MIlliken-type cable.
- the core 20 is surrounded by a corrugated metal sheath 21 having annular corrugations, but the corrugations could be helical as illustrated in FIG. 1.
- the conductor of the core 20 comprises three conductive strands 22 in the form of sectors which are helically would together about the longitudinal axis aa of the cable and defining a generally cylindrical passageway 23 which constitutes the duct for the supply of the cable impregnating fluid which may, for example, be sulfur hexa-fluoride, nitrogen, a mixture of sulfur hexafluoride and nitrogen, fluid oil, etc.
- a metal tape 24 which maintains the sectors 22 in their cylindrical helix configuration, so that the cross-section of the conductor of the core 20 is kept as nearly circular as possible.
- a metal tape 24 On the metal tape 24, there is a first, intemal, semi-conductive screen 25 surrounded by a dielectric layer 26 which, in turn, is surrounded by a second, external, semi-conductive screen 27.
- the latter is protected by a soft, conductive, tubular covering 28 similar to, and for the same purposes as, the covering 16.
- the soft, tubular covering 28 comprises an internal winding 29 of semiconductive crepe paper and an external winding 30 of a known type of cloth made of glass fibers and containing intercalated metal wires, namely, good electrically conductive elements which, extending from one part of the cloth to the other, can conductively interconnect
- an internal winding 29 of semiconductive crepe paper and an external winding 30 of a known type of cloth made of glass fibers and containing intercalated metal wires, namely, good electrically conductive elements which, extending from one part of the cloth to the other, can conductively interconnect
- An electric cable comprising at least one core including a conductor surrounded throughout substantially its length by at least one layer of insulating material and an external screening layer of at least semiconductive material surrounding said insulating layer,
- a corrugated metal sheath surrounding said core and a tube comprising solid, at leat semi-conductive material intermediate said core and said sheath and in frictional engagement and electrical contact with said screening layer and said sheath and at least partially filling the two contiguous layers between which the cloth of glass fibers containing intercalated metal wires is interposed.
- a conductive connection is established between the internal winding 29 of semiconductive crepe paper of the soft, tubular covering 28 and the corrugated sheath 21.
- the cloth of glass fibers 30 containing intercalated metal wires has also the advantages of acting as a thermal and mechanical protector of the core 20 in the excorrugations of said sheath to prevent slipping of said core with respect to said sheath and to conductively interconnect said screening layer and said sheath, said tube beings self-sustaining, resilient and softer than the material of said core to permit defomiation of said tube by the corrugations of said sheath without substantial deformation of said core and said tube having a shear strength sufficient to prevent said slippage without shearing when said cable is suspended by said sheath.
- An electric cable comprising at least one core including a conductor surrounded throughout its length by at least one layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core, and a tube of solid, at least semi-conductive, material intermediate said core and said sheath with the corrugations of said sheath embedded in said tube for preventing slipping of said core and said sheath relative to each other in a direction extending longitudinally of said cable when said cable is suspended by said sheath and for conductively interconnecting said screening layer and said sheath, said tube comprising at least one tape made of an insulating material different from that of said insulating layer, deformable by the corrugations of said sheath and having a normal exterior size in the absence of deformation thereof by said corrugations which is greater than the minimum diameter of said corrugations so that portions of said tube at least partially fill said corrugations and said tube encircling said core and having at least a portion of its interior
- An electric cable comprising at least one core including a conductor surrounded throughout substantially its length by at least one layer of insulating material and an external screening layer of at least semiconductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core and a tube of semi-conductive tape of crepe paper wound around said screening layer and intermediate said core and said sheath and in frictional engagement and electrical contact with said screening layer and said sheath and at least partially filling the corrugations of said sheath to prevent slipping of said core with respect to said sheath and to conductively interconnect said screening layer and said sheath, said tube being selfsustaining, resilient and softer than the material of said core to permit deformation of said tube by the corrugations of said sheath without substantial deformation of said core and said tube having a shear strength sufficient to prevent said slippage without shearing when said cable is suspended by said sheath 4.
- An electric cable comprising at least one core including a conductor surrounded throughout substantially its length by at least one layer of insulating material and an external screening layer of at least semiconductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core and a tube of semi-conductive tape of crepe paper wound around said screening layer and a further winding of glass fiber cloth containing intercalated metal wires wound around said tape and intermediate said core and said sheath and in frictional engagement and electrical contact with said screening layer and said sheath and at least partially filling the corrugations of said sheath to prevent slipping of said core with respect to said sheath and to conductively interconnect said screening layer and said sheath, said tube being self-sustaining, resilient and softer than the material of said core to permit deformation of said tube by the corrugations of said sheath without substantial deformation of said core and said tube having a shear strength sufficient to prevent said slippage without shearing when said cable is suspended by said sheath.
- An electric cable comprising at least one core including a conductor surrounded throughout its length by at least one layer of insulating material and an external screening layer of at least semi-conductive material surrounding said insulating layer, a corrugated metal sheath surrounding said core, and a tube of solid, at least semi-conductive, material intermediate said core and said sheath with the corrugations of said sheath embedded in said tube for preventing slipping of said core and sid said tube for preventing slipping of said core and said sheath relative to each other in a direction extending longitudinally of said cable when said cable is suspended by said sheath and for conductively interconnecting said screening layer and said sheath, said tube comprising at least one tape made of an insulating material different from that of said insulating layer and being made of semi-conductive crepe paper and said tube being deformable by the corrugations of said sheath and having a normal exterior size in the absence of deformation thereof by said corrugations which is greater than the minimum diameter of said corrugations so that portions of said tube at
Landscapes
- Insulated Conductors (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT31581/72A IT1044874B (it) | 1972-11-13 | 1972-11-13 | Cavo elettrico con guaina metallica ondulata perfezionato |
Publications (1)
Publication Number | Publication Date |
---|---|
US3843830A true US3843830A (en) | 1974-10-22 |
Family
ID=11233789
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00403962A Expired - Lifetime US3843830A (en) | 1972-11-13 | 1973-10-05 | Electric cable with corrugated sheath and semi-conductive protective layer between the sheath and the core |
Country Status (10)
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4020276A (en) * | 1975-04-11 | 1977-04-26 | Scal - Societe De Conditionnements En Aluminum | Sealant barrier for electrical cables |
US4059724A (en) * | 1975-03-22 | 1977-11-22 | Homare Ide | Shield wire |
US4145567A (en) * | 1977-06-06 | 1979-03-20 | General Cable Corporation | Solid dielectric cable resistant to electrochemical trees |
US4375632A (en) * | 1980-01-31 | 1983-03-01 | Sumitomo Electric Industries, Ltd. | Ignition cables |
JPH04300972A (ja) * | 1990-11-29 | 1992-10-23 | Bayer Ag | 改善された染料粒状物の製造法 |
US5414215A (en) * | 1992-01-28 | 1995-05-09 | Filotex | High frequency electric cable |
US6255591B1 (en) * | 1998-10-13 | 2001-07-03 | Gerhard Ziemek | Electric cables with metallic protective sheaths |
WO2004013868A3 (en) * | 2002-08-01 | 2004-04-15 | Southwire Co | Triaxial superconducting cable and termination therefor |
EP2093775A1 (en) * | 2008-02-20 | 2009-08-26 | ABB Technology AG | An electric power distribution cable and a power distribution arrangement provided therewith |
CN102959644A (zh) * | 2010-07-06 | 2013-03-06 | 瑞典爱立信有限公司 | 自支撑线缆 |
US20170352451A1 (en) * | 2016-06-03 | 2017-12-07 | AFC Cable Systems, Inc. | Metal clad cable having parallel laid conductors |
KR20180020550A (ko) * | 2016-08-18 | 2018-02-28 | 엘에스전선 주식회사 | 전력 케이블 |
US20180190409A1 (en) * | 2015-06-23 | 2018-07-05 | Nkt Hv Cables Gmbh | Electric Power Cable And A Process For The Production Of The Power Cable |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6144015U (ja) * | 1984-08-24 | 1986-03-24 | 横河電機株式会社 | 耐圧防爆容器 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5126780Y2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1971-03-05 | 1976-07-07 |
-
1972
- 1972-11-13 IT IT31581/72A patent/IT1044874B/it active
-
1973
- 1973-08-16 JP JP48091342A patent/JPS589521B2/ja not_active Expired
- 1973-10-05 US US00403962A patent/US3843830A/en not_active Expired - Lifetime
- 1973-10-30 AR AR250763A patent/AR196699A1/es active
- 1973-11-08 SE SE7315192A patent/SE382519B/xx unknown
- 1973-11-08 GB GB5195673A patent/GB1395519A/en not_active Expired
- 1973-11-09 BR BR8838/73A patent/BR7308838D0/pt unknown
- 1973-11-09 IE IE2028/73A patent/IE38504B1/xx unknown
- 1973-11-09 CA CA185,445A patent/CA994442A/en not_active Expired
- 1973-11-12 ZA ZA738653A patent/ZA738653B/xx unknown
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4059724A (en) * | 1975-03-22 | 1977-11-22 | Homare Ide | Shield wire |
US4020276A (en) * | 1975-04-11 | 1977-04-26 | Scal - Societe De Conditionnements En Aluminum | Sealant barrier for electrical cables |
US4145567A (en) * | 1977-06-06 | 1979-03-20 | General Cable Corporation | Solid dielectric cable resistant to electrochemical trees |
US4375632A (en) * | 1980-01-31 | 1983-03-01 | Sumitomo Electric Industries, Ltd. | Ignition cables |
JPH04300972A (ja) * | 1990-11-29 | 1992-10-23 | Bayer Ag | 改善された染料粒状物の製造法 |
US5414215A (en) * | 1992-01-28 | 1995-05-09 | Filotex | High frequency electric cable |
US6255591B1 (en) * | 1998-10-13 | 2001-07-03 | Gerhard Ziemek | Electric cables with metallic protective sheaths |
US20050173149A1 (en) * | 2002-08-01 | 2005-08-11 | Gouge Michael J. | Triaxial superconducting cable and termination therefor |
WO2004013868A3 (en) * | 2002-08-01 | 2004-04-15 | Southwire Co | Triaxial superconducting cable and termination therefor |
US20080179070A1 (en) * | 2002-08-01 | 2008-07-31 | Gouge Michael J | Triaxial Superconducting Cable and Termination Therefor |
EP2093775A1 (en) * | 2008-02-20 | 2009-08-26 | ABB Technology AG | An electric power distribution cable and a power distribution arrangement provided therewith |
CN102959644A (zh) * | 2010-07-06 | 2013-03-06 | 瑞典爱立信有限公司 | 自支撑线缆 |
US20130213687A1 (en) * | 2010-07-06 | 2013-08-22 | Telefonaktiebolaget L M Ericsson (Publ) | Self-Supporting Cable |
US10381132B2 (en) * | 2010-07-06 | 2019-08-13 | Nkt Cables Group A/S | Self-supporting cable |
US20180190409A1 (en) * | 2015-06-23 | 2018-07-05 | Nkt Hv Cables Gmbh | Electric Power Cable And A Process For The Production Of The Power Cable |
US10679772B2 (en) * | 2015-06-23 | 2020-06-09 | Nkt Hv Cables Ab | Electric power cable and a process for the production of the power cable |
US20170352451A1 (en) * | 2016-06-03 | 2017-12-07 | AFC Cable Systems, Inc. | Metal clad cable having parallel laid conductors |
KR20180020550A (ko) * | 2016-08-18 | 2018-02-28 | 엘에스전선 주식회사 | 전력 케이블 |
Also Published As
Publication number | Publication date |
---|---|
IT1044874B (it) | 1980-04-21 |
IE38504L (en) | 1974-05-13 |
IE38504B1 (en) | 1978-03-29 |
AU6241973A (en) | 1975-05-15 |
AR196699A1 (es) | 1974-02-12 |
ZA738653B (en) | 1974-11-27 |
BR7308838D0 (pt) | 1974-08-22 |
GB1395519A (en) | 1975-05-29 |
JPS589521B2 (ja) | 1983-02-21 |
JPS49124584A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1974-11-28 |
SE382519B (sv) | 1976-02-02 |
CA994442A (en) | 1976-08-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3927247A (en) | Shielded coaxial cable | |
US3678177A (en) | Telecommunication cables | |
US3843830A (en) | Electric cable with corrugated sheath and semi-conductive protective layer between the sheath and the core | |
US3023267A (en) | Combination power and communication cable | |
US3594492A (en) | Pipe-type cable systems with reduced ac losses | |
US2322702A (en) | Shielded cable | |
KR20150099373A (ko) | Dc용 케이블의 종단접속함 | |
KR20150101353A (ko) | 종단접속부를 구비한 전력케이블 | |
US20050167150A1 (en) | Three-conductor cable | |
US3828114A (en) | Synthetic resin sleeve with embedded stress control screen for high-voltage cables | |
GB2142468A (en) | Multi-core oil-filled electric cable | |
EP0312424B1 (en) | Cable installation method | |
US3082387A (en) | Multi-conductor telecommunication cables for audio and carrier frequencies | |
US3766309A (en) | Electric cable with corrugated metallic sheath | |
US3485224A (en) | Composite electric cable with mechanical protection for structurally weak conductive elements | |
US1199789A (en) | Electrical conductor. | |
GB2059669A (en) | Improvement in or relating to telecommunication cables | |
US4454375A (en) | Power cable joint structure having sheath isolation member containing electrode spheres | |
KR20170105246A (ko) | 케이블 접속함용 조인트 슬리브 및 조인트 슬리브를 구비한 케이블 | |
GB2165690A (en) | Electrical cables | |
JP2585591B2 (ja) | 光ファイバ複合単心電力ケ−ブル | |
GB2095459A (en) | A high-current cable for medium-frequency three-phase current | |
NL8001499A (nl) | Ruisarme kabel. | |
EP4546585A1 (en) | Direct current cable system | |
CN220731212U (zh) | 一种单芯非磁性金属带铠装动力电缆 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SOCIETA PIRELLI S.P.A., PIAZZALE CADORNA 5, 20123 Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INDUSTRIE PIRELLI S.P.A.;REEL/FRAME:003847/0084 Effective date: 19810101 |