DK156788B - SHIELDED POWER CABLE - Google Patents
SHIELDED POWER CABLE Download PDFInfo
- Publication number
- DK156788B DK156788B DK15277A DK15277A DK156788B DK 156788 B DK156788 B DK 156788B DK 15277 A DK15277 A DK 15277A DK 15277 A DK15277 A DK 15277A DK 156788 B DK156788 B DK 156788B
- Authority
- DK
- Denmark
- Prior art keywords
- conductor
- cable
- coating
- sheath
- semiconductor
- Prior art date
Links
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
- H01B9/028—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients with screen grounding means, e.g. drain wires
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/22—Metal wires or tapes, e.g. made of steel
- H01B7/221—Longitudinally placed metal wires or tapes
- H01B7/225—Longitudinally placed metal wires or tapes forming part of an outer sheath
Description
DK 156788 BDK 156788 B
Den foreliggende opfindelse angâr et afskærmet stærkstrpmskabel af den i den indledende del af krav 1 angivne type.The present invention relates to a shielded strong current cable of the type set forth in the preamble of claim 1.
Et sâdant hpjspændingskabel er strukturmæssigt sammensat af fplgen-de væsentlige elementer: en flertrâdet eller massiv leder, et isola-5 tionslag, et halvledende lag tjenende til afskærmning af isolationen, en afskærmning af metalbând og/eller metaltràde samt en ikke ledende yder-kappe. Der kendes ligeledes en kabelstruktur, hvori der, ud over det til afskærmning af isolationen tjenende halvledende lag, kun findes et lille antal, eksempelvis seks, korrosionsbestandige metaltràde i form af en 10 skruelinie med stor stigning, og disse trâde tjener samtidig som jordle-der.Such a high voltage cable is structurally composed of the following essential elements: a multi-wire or solid conductor, an insulation layer, a semiconducting layer serving to shield the insulation, a metal band and / or metal wire shielding, and a non-conductive outer sheath. A cable structure is also known in which, in addition to the semi-conductive layer used for shielding the insulation, only a small number, for example six, corrosion-resistant metal wire in the form of a large pitch helix and these threads serve as earth conductors. .
Fra USA patentskrift 3.794.752 kendes et kabel af den aktuelle type indeholdende en hovedleder, som er omgivet af en isolationskappe, en til afskærmning tjenende halvledende kappe, som er anbragt pâ isolationskap-15 pen samt en nul- eller jordleder, som star i elektrisk kontakt med halv-lederkappen. I dette kendte kabel er nullederen forsynet med sin egen halvledende kappe, som dog kan være udformet i ét med den halvledende kappe pâ hovedlederens isolationskappe. Bade nullederens og hovedlede-rens halvlederkappe bestâr imidlertid af et pâekstruderet lag af plast-20 materiale, der er gjort halvledende ved tilsætning af ledende stoffer.U.S. Patent No. 3,794,752 discloses a cable of the current type containing a main conductor enclosed by an insulating sheath, a shielding semiconductor sheath mounted on the insulating sheath, and a zero or ground conductor staring electrically contact with the semi-conductor sheath. In this known cable, the neutral conductor is provided with its own semiconductor sheath, which may, however, be formed in combination with the semiconductor sheath of the main conductor insulation sheath. However, both the non-conductor and the main conductor semiconductor sheath consist of an extruded layer of plastic material made semi-conductive by the addition of conductive substances.
Da denne stofiblanding forpger plastmaterialets viskositet, skal der ar-bejdes med et hdjt ekstruderingstryk med tilsvarende hdje omkostninger.Since this substance mixture impairs the viscosity of the plastic material, a high extrusion pressure must be worked with correspondingly high costs.
Pà grund af fremstillingsmâden skal halvlederkappen ogsà nddvendigvis hâve en vis, forholdsvis stor godstykkelse med heraf fplgende for0gelse 25 af materialeomkostningerne samt kabeldimensionerne.Due to the method of manufacture, the semiconductor sheath also necessarily has to have a certain, relatively large thickness of material, with the consequent increase in the material cost and the cable dimensions.
Fra tysk fremlæggelsesskrift 1.202.369 kendes endvidere et kabel af den aktuelle type, som indeholder tre hovedledere, der er omgivet af en isolationskappe og er indlejret i en fælles inderkappe af isolerende materiale. Udvendigt pâ inderkappen er der anbragt et antal trâde, der 30 tjener som nul- eller jordledere og er fprt skruelinieformet omkring inderkappen til dannelse af en âben fortrâdning. Disse ledere er indlejret i en ikke-metallisk yderkappe, og en til afskærmning af hovedlederne indrettet halvledende belægning bestâr af en selvstændig kappe, der kan være dannet ved omspinding med tynde kobbertrâde eller af plast med i-35 blandet sod eller grafit.Furthermore, from German publication specification 1,202,369 a cable of the current type is known, which contains three main conductors, which are surrounded by an insulating sheath and embedded in a common inner sheath of insulating material. Exterior of the inner sheath is arranged a plurality of threads which serve as zero or ground conductors and are initially helically shaped around the inner sheath to form an open thread. These conductors are embedded in a non-metallic outer sheath, and a semiconductor coating provided for shielding the main conductors consists of a self-contained sheath which may be formed by winding with thin copper wire or plastic with i-35 mixed soot or graphite.
Ogsâ denne kendte kabelkonstruktion er forholdsvis besværlig og kostbar at fremstille. De tre hovedledere skal sâledes fprst bringes sammen, hvorefter inderkappen, som omgiver hovedlederne, kan pâfpres vedThis known cable construction is also relatively cumbersome and expensive to manufacture. The three main conductors must thus be brought together first, after which the inner sheath, which surrounds the main conductors, can be pressed
DK 156788 BDK 156788 B
2 ekstrudering. Derefter bliver det til afskærmning tjenende halvlederlag pâf0rt pâ inderkappen, ligeledes ved ekstrudering, hvorefter nullederne kan pâsættes i en yderligere arbejdsoperation. First derefter kan yder-kappen pâlægges i en separat arbejdsoperation.2 extrusion. Then, for shielding, semiconductor layers are applied to the inner sheath, also by extrusion, after which the neutral conductors can be applied in a further working operation. Only then can the outer sheath be applied in a separate work operation.
5 Det er et formai for opfindelsen at tilvejebringe et stærkstrpmska-bel, som er væsentligt enklere og billigere at fremstille end kendte kabler, og som muliggir en simplere montage uden at være behæftet med ulemper med hensyn til kvalitet og hândtering, især hvad angâr kortslut-ningssikkerhed og bijelighed. Dette opnâs med de i den kendetegnende del 10 af krav 1 angivne ejendommeligheder for kablet ifilge opfindelsen.It is an object of the invention to provide a strong power cable which is substantially simpler and cheaper to manufacture than known cables, and which allows for simpler assembly without being disadvantaged with regard to quality and handling, especially in the case of short circuits. safety and affordability. This is achieved with the characteristics of the cable according to the invention as stated in the characterizing part 10 of claim 1.
Opfindelsen er sâledes baseret pâ den erkendelse, at der ikke er behov for en selvstaending kappe udformet ved ekstrudering for at opnâ afskærmning og en tilstrækkelig kortslutningssikkerhed, idet et særdeles tyndt overtræk af grafit eller af et splvfarvestof - indeholdende akryl-15 plast - har vist sig at være fuldt tilstrækkeligt. Det tynde halvledende overtræk kan pâfires ved pâgnidning eller pàstrygning og har fortrinsvis en tykkelse pâ hijst 0,2 mm.The invention is thus based on the realization that there is no need for a self-standing jacket designed by extrusion to achieve shielding and sufficient short-circuit safety, since a particularly thin coating of graphite or of a splash dye - containing acrylic plastic - has been found. to be fully sufficient. The thin semiconductor coating can be applied by rubbing or ironing and preferably has a thickness of at most 0.2 mm.
Fremstillingen af kablet ifilge opfindelsen kan ske i færre ar-bejdstrin. Det er sâledes muligt at udfire pâgnidningen eller pâstryg-20 ningen af det tynde, halvledende overtræk i samme arbejdsgang som hoved-lederens indlejring i isoleringsmateriale. I en næste operation kan den elektriske leder anbringes pâ overtrækket samtidig med, at den ikke-me-talliske yderkappe pâfires. I denne forbindelse er det særligt fordel-agtigt, at pâfpringen af det tynde, halvledende overtræk kan ske umid-25 delbart efter pâekstruderingen af isoleringsmateriale pâ hovedlederen, mens denne inderkappes overflade endnu er blid. Herved kan der opnâs en god forbindelse mellem overtrækket og isoleringsmaterialet i inderkappen.The fabrication of the cable according to the invention can be done in fewer work steps. Thus, it is possible to carry out the rubbing or application of the thin, semiconducting coating in the same operation as the main conductor embedding in insulating material. In a subsequent operation, the electrical conductor can be applied to the coating while the non-metallic outer sheath is applied. In this connection, it is particularly advantageous that the thin semiconductor coating can be imprinted immediately after the extrusion material is extruded onto the main conductor, while the surface of this inner sheath is still gentle. This allows a good connection between the coating and the insulating material in the inner sheath.
Som grafit kan der anvendes pulvergrafit eller kolloidgrafit, idet 30 fprstnævnte hensigtsmæssigt pâgnides, mens sidstnævnte hensigtsmæssigt 4 5 pâstryges. Pulvergrafitlagets elektriske modstand er 10 - 10 ohm pr.As graphite, powder graphite or colloid graphite can be used, with the first 30 being suitably plastered while the latter suitably 45 being plastered. The electrical resistance of the powder graphite layer is 10 - 10 ohms per.
meter, mens den elektriske modstand i et silvfarvestof - indeholdende 2 akrylplastlag, kun er ca. 10 - 10 ohm pr. meter.meters, while the electrical resistance of a silver dye - containing 2 acrylic plastic layers - is only approx. 10 - 10 ohm pr. meters.
I det filgende skal opfindelsen beskrives næramere ud fra hen-35 sigtsmæssige udfprelsesformer og under henvisning til tegningen, hvor fig. 1-3 viser tværsnit igennem respektive afskærmede stærk-strimskabler ifilge opfindelsen med forskellige former for jord- eller nulledere, ogIn the following, the invention will be described in more detail from the appropriate embodiments and with reference to the drawing, in which fig. 1-3 show cross sections through respective shielded strong-strip cables according to the invention with various forms of ground or zero conductors, and
DK 156788 BDK 156788 B
3 fig. 4-6 forskellige udf0relsesformer for kablet if0lge opfindel-sen, som er anvendelige i lavspændingsnet.3 FIG. 4-6 different embodiments of the cable according to the invention which are useful in low voltage networks.
Fig. 1 viser en hensigtsmæssig udfprelsesform for opfindelsen. En leder 1, som almindeligvis er en med en ledende afskærmning forsynet 5 flertrâdet leder af aluminium eller kobber, men som ogsâ kan være udfor-met som en massiv aluminiumsleder, er omgivet af en isolering 2, som hensigtsmæssigt er fremstillet af et plastmateriale eller en syntetisk kautsjukblanding, og denne isoleringskappe er forsynet med et halvleden-de lag 3, eksempelvis af kol1oidgrafit. Langs en, to eller flere frem-10 bringere for denne halvledende cylinderflade - hvor disse frembringeres stilling hensigtsmæssigt svarer til hjdrnepunkter for en regulær poly-gon, som kan omskrives af cylinderfladens cirkelprofil - er der anbragt en eller flere ved drejestpd fremstillede og parailelt med kabelaksen liggende fortrâdninger 4 pâ en sâdan mâde, at disse fortrâdninger holdes 15 i berpring med det halvledende lag 3 i kablet som felge af elasticiteten i en ikke-metallisk kappe 5, der hensigtsmæssigt er fremstillet af et plastmateriale eller en syntetisk kautsjukblanding.FIG. 1 shows a suitable embodiment of the invention. A conductor 1, which is usually a conductive shield 5 provided with aluminum or copper conductors, but which may also be formed as a solid aluminum conductor, is surrounded by an insulation 2 suitably made of a plastic material or a synthetic rubber blend, and this insulating jacket is provided with a semiconductor layer 3, for example of colloid graphite. Along one, two or more generators for this semiconductor cylinder surface - where the position of these generously corresponds to the vertices of a regular polygon, which can be circumscribed by the circular profile of the cylinder surface - one or more at pivot points made and parallel to the cable axis are arranged. 2 in such a way that these threads are held in contact with the semiconducting layer 3 in the cable as rims of the elasticity of a non-metallic sheath 5 suitably made of a plastic material or a synthetic rubber blend.
I fig. 2 vises en anden udforelsesform, hvori métalfortrâdningen 4 har en affladet profil med henblik pâ at opnâ en bedre kontakt samt en 20 mindre radialdimension, I fig. 3 vises endnu en udfprelsesform, hvori fortrâdningen 4 er fremstillet af et grundmateriale med stprre mekanisk styrke, hensigtsmæssigt stâl eller legeret aluminium, og hvori den del af den ikke-metalliske kappe 5, som omgiver fortrâdningen 4, er udformet med en eg-25 net profil, hvorved fortrâdningen kan benyttes som bærekabel, og hele kablet kan anvendes som luftkabel.In FIG. 2 shows another embodiment in which the metal wire 4 has a flattened profile for better contact and a smaller radial dimension. 3, another embodiment is shown in which the wire 4 is made of a base material of greater mechanical strength, suitably steel or alloyed aluminum, and in which the part of the non-metallic sheath 5 surrounding the wire 4 is formed with a suitable mesh. profile, whereby the wire can be used as a carrier cable and the entire cable can be used as an air cable.
I fig. 4, 5 og 6 vises udfprelsesformer, som kan anvendes i lavspændingsnet.In FIG. Figures 4, 5 and 6 show embodiments that can be used in low voltage networks.
I den i fig. 4 viste udfprelsesform kan tværsnittet for fortrâdnin-30 gen 4 (nullederen) svare til en sjettedel og sâgar til en trediedel af tværsnittet for lederen 1 (faselederen), ait efter det pâgældende be-skyttelsessystem. I udf0relsesformen ifplge fig. 5 bestâr fortrâdningen 4 (nullederen) af to ledere med samme tværsnit. I dette tilfælde svarer det samlede tværsnit for de to nulledere til en sjettedel eller en tre-35 diedel af faselederens tværsnit.In the embodiment shown in FIG. 4, the cross-section of the conductor 4 (zero conductor) may correspond to one-sixth and cut to one third of the cross-section of the conductor 1 (the phase conductor) according to the protection system in question. In the embodiment according to FIG. 5, the wire 4 (zero conductor) consists of two conductors of the same cross-section. In this case, the total cross-section of the two zero conductors corresponds to one-sixth or a three-thirds portion of the phase conductor cross-section.
Fig. 6 viser et enfaset tilslutningskabel, hvori tværsnittet for fortrâdningen 4 (nullederen) svarer til tværsnittet for lederen 1 (faselederen). Et fælles træk ved de omtalte udf0relsesformer (fig. 4, 5 ogFIG. 6 shows a single-phase connection cable in which the cross-section of the conductor 4 (the neutral conductor) corresponds to the cross-section of the conductor 1 (the phase conductor). A common feature of the embodiments described (Figs. 4, 5 and
DK 156788 BDK 156788 B
4 6) bestâr i, at den ikke-metaniske kappe 5 ved kabelmontage let kan ad-skilles fra isoleringen 2 - som fplge af det halvledende lags 3 tilste-deværelse - ogsâ nâr isoleringen 2 og den ikke-metalliske kappe 5 er fremstillet af det samme grundmateriale, eksempelvis plastificeret PVC-5 materiale.4) consists in the fact that the non-metallic sheath 5 can be easily separated from the insulation 2 from the insulation 2 - as a result of the presence of the semiconducting layer 3 - even when the insulation 2 and the non-metallic sheath 5 are made of it. the same basic material, eg plasticized PVC-5 material.
Yderligere en fælles hensigtsmæssighed ved de omtalte udfdrelses-former bestâr i, at kablet, nâr lederen 1 og fortrâdningen 4 er til stede, kan fremstilles i en enkelt arbejdsgang ved brug af to pâ linie opstillede ekstrudere.A further common usefulness of the embodiments disclosed is that the cable, when conductor 1 and the wiring 4 are present, can be manufactured in a single operation using two in-line extruders.
10 I udfdrelsesformerne ifdlge fig. 4, 5 og 6 anvendes det kon-struktionselement, nemlig det halvledende lag 3, som er sædvanligt i h0-jspændingskabler, ogsâ i lavspændingskabler. Dette medforer den yderligere fordel, at tykkelsen af isoleringen 2 - især med en leder 1 (fase-leder) af massïvt aluminium - kan nedsættes væsentligt under hensyntagen 15 til den elektriske belastning. Eksempelvis ved et ledertværsnit pâ 240 2 mm og med en isolering af plastificeret PVC kan tykkelsen formindskes fra 2,4 mm til 0,8 mm.10 In the embodiments of FIG. 4, 5 and 6, the structural element, namely the semiconducting layer 3, which is customary in high voltage cables, is also used in low voltage cables. This has the added advantage that the thickness of the insulation 2 - especially with a solid aluminum conductor 1 (phase conductor 1) - can be significantly reduced taking into account the electrical load. For example, at a conductor cross-section of 240 2 mm and with an insulation of plasticized PVC, the thickness can be reduced from 2.4 mm to 0.8 mm.
Ved jordkabler sikres den .mekaniske beskyttelse af det tyndere iso-leringslag af den ikke-metalliske kappe 5, som er mindst 1,8 mm tyk, og 20 som almindeligvis er fremstillet af plastificeret PVC. Dermed kan der opnâs en omkostningsformindskelse ved anvendelse af lavspændingskabler if0lge opfindelsen.With ground cables, the mechanical protection of the thinner insulation layer of the non-metallic sheath 5, which is at least 1.8 mm thick and 20, which is usually made of plasticized PVC, is ensured. Thus, a cost reduction can be achieved by using low voltage cables according to the invention.
Kablet if0lge opfindelsen bestâr af de i kabelindustrieit sædvairh’ge konstruktionselementer, og fremstillingen kan foregâ ved brug af i ka-25 belindustrien sædvanligt anvendte arbejdsprocedurer, men da antallet af arbejdsoperationer er mindre, finder produktionen sted pâ en i dkonomisk henseende bedst mulig mâde.The cable according to the invention consists of the usual structural elements in the cable industry, and the manufacture can be carried out using the usual working procedures used in the cable industry, but since the number of working operations is smaller, production takes place in an economical way as best as possible.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HUMA002769 | 1976-04-29 | ||
| HU76MA2769A HU175494B (en) | 1976-04-29 | 1976-04-29 | Shielded power-current cable |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK15277A DK15277A (en) | 1977-10-30 |
| DK156788B true DK156788B (en) | 1989-10-02 |
| DK156788C DK156788C (en) | 1990-02-19 |
Family
ID=10998838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK15277A DK156788C (en) | 1976-04-29 | 1977-01-14 | SHIELDED POWER CABLE |
Country Status (16)
| Country | Link |
|---|---|
| BE (1) | BE850912A (en) |
| BG (1) | BG27765A3 (en) |
| CH (1) | CH615526A5 (en) |
| CS (1) | CS207711B2 (en) |
| DD (1) | DD129013A5 (en) |
| DE (1) | DE2701233B2 (en) |
| DK (1) | DK156788C (en) |
| FR (1) | FR2349930A1 (en) |
| GB (1) | GB1549150A (en) |
| HU (1) | HU175494B (en) |
| IT (1) | IT1091802B (en) |
| NL (1) | NL7700660A (en) |
| PL (1) | PL114352B1 (en) |
| RO (1) | RO72343A (en) |
| SE (1) | SE7700166L (en) |
| YU (1) | YU39384B (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2519505A1 (en) * | 1981-12-31 | 1983-07-08 | Thomson Jeumont Cables | Earthing screen for electrical resistance heating wire - being combination of conductive wire and annular strip |
| US5171938A (en) * | 1990-04-20 | 1992-12-15 | Yazaki Corporation | Electromagnetic wave fault prevention cable |
| SK164098A3 (en) | 1996-05-29 | 1999-06-11 | Asea Brown Boveri | Transformer/reactor |
| SE9602079D0 (en) | 1996-05-29 | 1996-05-29 | Asea Brown Boveri | Rotating electric machines with magnetic circuit for high voltage and a method for manufacturing the same |
| JP2000511337A (en) | 1996-05-29 | 2000-08-29 | アセア ブラウン ボヴェリ エービー | Insulated conductor for high voltage winding and method of manufacturing the same |
| EP1016187B1 (en) | 1996-05-29 | 2003-09-24 | Abb Ab | Conductor for high-voltage windings and a rotating electric machine comprising a winding including the conductor |
| SE510422C2 (en) | 1996-11-04 | 1999-05-25 | Asea Brown Boveri | Magnetic sheet metal core for electric machines |
| SE515843C2 (en) | 1996-11-04 | 2001-10-15 | Abb Ab | Axial cooling of rotor |
| SE512917C2 (en) | 1996-11-04 | 2000-06-05 | Abb Ab | Method, apparatus and cable guide for winding an electric machine |
| SE509072C2 (en) | 1996-11-04 | 1998-11-30 | Asea Brown Boveri | Anode, anodizing process, anodized wire and use of such wire in an electrical device |
| SE9704423D0 (en) | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | Rotary electric machine with flushing support |
| SE508543C2 (en) | 1997-02-03 | 1998-10-12 | Asea Brown Boveri | Coiling |
| SE508544C2 (en) | 1997-02-03 | 1998-10-12 | Asea Brown Boveri | Method and apparatus for mounting a stator winding consisting of a cable. |
| SE9704422D0 (en) | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | End plate |
| SE9704421D0 (en) | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | Series compensation of electric alternator |
| SE9704427D0 (en) | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | Fastening device for electric rotary machines |
| HUP0101186A3 (en) | 1997-11-28 | 2002-03-28 | Abb Ab | Method and device for controlling the magnetic flux with an auxiliary winding in a rotaing high voltage electric alternating current machine |
| US6801421B1 (en) | 1998-09-29 | 2004-10-05 | Abb Ab | Switchable flux control for high power static electromagnetic devices |
| CN103208331A (en) * | 2013-03-19 | 2013-07-17 | 启东沃玛力电器辅件有限公司 | Spring cable |
| CN106205785B (en) * | 2016-10-14 | 2018-06-19 | 张家港市新邦电力科技有限公司 | A kind of copper clad steel signal cable |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1202369B (en) * | 1952-09-04 | 1965-10-07 | Siemens Ag | Multi-core electrical power cable |
| US3794752A (en) * | 1973-05-30 | 1974-02-26 | Anaconda Co | High voltage cable system free from metallic shielding |
-
1976
- 1976-04-29 HU HU76MA2769A patent/HU175494B/en unknown
-
1977
- 1977-01-07 CH CH15977A patent/CH615526A5/en not_active IP Right Cessation
- 1977-01-10 SE SE7700166A patent/SE7700166L/en not_active Application Discontinuation
- 1977-01-13 DE DE19772701233 patent/DE2701233B2/en not_active Withdrawn
- 1977-01-14 DK DK15277A patent/DK156788C/en active
- 1977-01-17 BG BG7735176A patent/BG27765A3/en unknown
- 1977-01-17 CS CS25577A patent/CS207711B2/en unknown
- 1977-01-19 RO RO7789091A patent/RO72343A/en unknown
- 1977-01-21 NL NL7700660A patent/NL7700660A/en not_active Application Discontinuation
- 1977-01-21 IT IT1952577A patent/IT1091802B/en active
- 1977-01-31 BE BE174510A patent/BE850912A/en not_active IP Right Cessation
- 1977-01-31 FR FR7702612A patent/FR2349930A1/en active Granted
- 1977-03-02 YU YU56777A patent/YU39384B/en unknown
- 1977-03-04 DD DD19767477A patent/DD129013A5/en unknown
- 1977-03-29 GB GB1305177A patent/GB1549150A/en not_active Expired
- 1977-04-19 PL PL19748677A patent/PL114352B1/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1202369B (en) * | 1952-09-04 | 1965-10-07 | Siemens Ag | Multi-core electrical power cable |
| US3794752A (en) * | 1973-05-30 | 1974-02-26 | Anaconda Co | High voltage cable system free from metallic shielding |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2349930A1 (en) | 1977-11-25 |
| CH615526A5 (en) | 1980-01-31 |
| DD129013A5 (en) | 1977-12-21 |
| IT1091802B (en) | 1985-07-06 |
| SE7700166L (en) | 1977-10-30 |
| DE2701233B2 (en) | 1980-07-24 |
| NL7700660A (en) | 1977-11-01 |
| BG27765A3 (en) | 1979-12-12 |
| YU39384B (en) | 1984-12-31 |
| DE2701233A1 (en) | 1977-11-10 |
| DK156788C (en) | 1990-02-19 |
| FR2349930B1 (en) | 1981-12-18 |
| PL114352B1 (en) | 1981-01-31 |
| CS207711B2 (en) | 1981-08-31 |
| YU56777A (en) | 1982-02-28 |
| BE850912A (en) | 1977-05-16 |
| HU175494B (en) | 1980-08-28 |
| DK15277A (en) | 1977-10-30 |
| RO72343A (en) | 1982-05-10 |
| GB1549150A (en) | 1979-08-01 |
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