EP3180794B1 - Electrical cable - Google Patents

Electrical cable Download PDF

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Publication number
EP3180794B1
EP3180794B1 EP15750696.5A EP15750696A EP3180794B1 EP 3180794 B1 EP3180794 B1 EP 3180794B1 EP 15750696 A EP15750696 A EP 15750696A EP 3180794 B1 EP3180794 B1 EP 3180794B1
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EP
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Prior art keywords
electrical cable
neutral
cable according
wires
conductors
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EP15750696.5A
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German (de)
French (fr)
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EP3180794A1 (en
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Christoph Studer
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    • 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
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H01B7/041—Flexible cables, conductors, or cords, e.g. trailing cables attached to mobile objects, e.g. portable tools, elevators, mining equipment, hoisting cables
    • 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
    • H01B7/0009—Details relating to the conductive cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/003—Power cables including electrical control or communication wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/04—Concentric cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H01B1/026—Alloys based on copper
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/006—Constructional features relating to the conductors

Definitions

  • the invention relates to an electric cable for the electrical supply of an aircraft, engine or the like, for at least partially higher frequencies of preferably 400 Hz, with a central neutral and / or return conductor and at least six concentrically arranged around the latter arranged phase conductors.
  • Such electrical cables are used for the transport of large currents with higher frequencies in aircraft and in the ground. Due to the overall symmetrical structure and the two conductors Split phase design, they also have symmetrical and optimally reduced inductive voltage drops with minimized skin effect and are therefore used in particular for longer distances. Particularly in the case of aircraft, the electrical supply with high-frequency current is known to have the advantage that lighter generators, motors and similar, in particular inductively acting components or equipment can be used in the aircraft.
  • the neutral and / or return conductor is designed as a one-piece, solid or flexible neutral conductor
  • the symmetrical structure of the cable entails that the neutral conductor in the Center of the cable is guided.
  • the cable When using the cable as a flexible umbilical cable, as is the case when using it as an electrical power cable for aircraft, they are when not in use on drums rolled or unrolled while docking with the aircraft and pulled along the asphalt floor or the like. It is then the fact that in the center of the cable is an active single core, which is subjected by torsion of a heavy mechanical load, because the supply cables are repeatedly exposed to a bending load due to the repeated rolling up and down.
  • the neutral conductor usually has only half the cross section of the phase conductors (each with 2 phases).
  • the neutral conductor causes an addition of the generated harmonics in the neutral conductor, the skin effect and thus the load in this disadvantageously increased.
  • the invention has for its object to provide an electric cable of the type mentioned, which has an optimal flexibility and torsional resistance, but still ensures optimum electrical values, without the risk of breakage of the central neutral and / or return conductor. Furthermore, the adverse skin effect in the neutral or return conductor should be reduced while maintaining the same diameter of the neutral conductor.
  • the neutral and / or return conductor is constructed from a plurality of individually insulated neutral conductors whose overall cross-section approximately corresponds to the cross-section of a single solid central conductor.
  • the new cable design also allows redundancy of the central neutral and / or return conductor, as it is practically impossible, unlike conventional designs with only one solid neutral, that all six individual conductors of the multipart neutral conductor can break at the same time. As a result, the risk of a neutral break is greatly reduced, since there is no more active conductor in the center of the electric cable and a multiple redundancy is effective.
  • the electric cable shown has a central core network as a neutral and / or return conductor 1 and six concentrically distributed around this uniformly distributed phase conductors 2a, 2b, 3a, 3b, 4a, 4b, each phase on two symmetrically opposite phase conductors 2a, 2b, 3a, 3b, and 4a, 4b is divided.
  • the six phase conductors 2a to 4b have, for example, a cross section of 35 mm 2 and are made of bare and finely stranded copper strands 5.
  • These copper strands 5 are designed according to the standard IEC 60228, at least Class 5, wherein each phase conductor is provided with an insulation 6 made of a preferably crosslinked plastic insulation, such as EPR.
  • the electric cable is further equipped with an inner sheath 13 of orange polyurethane as abrasion display and an outer sheath 14 of yellow polyurethane with intermediate fiber reinforcement 15.
  • an inner sheath 13 of orange polyurethane as abrasion display
  • other colors could be used.
  • the electric cable is constructed from six individually insulated neutral conductors 16, each with a single insulation 19, wherein the neutral conductors 16 and the phase conductors 2a, 2b, 3a, 3b, 4a, 4b are each formed from a plurality of wires.
  • the neutral conductors 16 are advantageously constructed with SRC (Special Round Conductor) soils or Unilay strands with a cross section of 6 mm 2 in each case, that is to say totally 36 mm 2 , which corresponds to the cross section of a conventional non-split neutral conductor.
  • SRC Specific Round Conductor
  • a number of strands are usually wound in a rope shape around a center made of copper strands 8, bare and finely stranded, with an insulation 9 made of EPR, crosslinked.
  • the individual neutral conductors 16 of the split neutral and / or return conductor 1 are arranged around a central element 17 made of plastic material and have a thin sheathing 18 or banding comprising them, likewise made of insulating material.
  • the neutral conductors 16 are made of finely stranded copper strands and isolated individually with an insulation 19 made of a preferably crosslinked plastic, for example a polyolefin copolymer, thin-walled and electron-beam crosslinked.
  • the risk of central conductor breakage can be greatly reduced compared to the prior art without changing the overall cross section of the cable and adversely affecting its excellent electrical properties. Since virtually all six individual neutral conductors 16 can not break at the same time, there results a multiple redundancy of the neutral conductor divided according to the invention, which entails a great reduction in the risk of a neutral conductor break, especially since no active conductor is present in the geometric center of the cable.
  • the electric cable comprises within the scope of the invention between the adjacent phase conductors 2a, 2b, 3a, 3b, 4a, 4b on the outside additionally uniformly distributed over the circumference outside picks 10, which have spiked conductors 11 as fours each 4x1 mm 2 , which also made of fine-stranded copper strands with each one insulation 12 are provided from a turn preferably crosslinked plastic insulation.
  • the stranding direction of the insulated neutral conductors 16 is the same as that of the phase conductors 2a, 2b, 3a, 3b, 4a, 4b.
  • the lay lengths are dimensioned to each other such that in torsion, the changes in length of the inner neutral conductor are approximately equal to those of the outer phase conductors.
  • additional neutral conductors may be included in the outer spikes of the cable, by means of which allow a further increase in the total cross-section of the neutral and / or return conductor, for example, on the full phase cross-section.

Description

Die Erfindung betrifft ein Elektrokabel für die elektrische Versorgung eines Flugzeugs, Motors oder ähnlichem, für zumindest teilweise höhere Frequenzen von vorzugsweise 400 Hz, mit einem zentralen Neutral- und/oder Rückleiter und mindestens sechs konzentrisch um letzteren herum verteilt angeordneten Phasenleitern.The invention relates to an electric cable for the electrical supply of an aircraft, engine or the like, for at least partially higher frequencies of preferably 400 Hz, with a central neutral and / or return conductor and at least six concentrically arranged around the latter arranged phase conductors.

Derartige Elektrokabel werden für den Transport von grossen Strömen mit höheren Frequenzen bei Luftfahrzeugen und im Erdreich eingesetzt. Durch den gesamtheitlich symmetrischen Aufbau und die auf je zwei Leiter aufgeteilte Phasenkonstruktion weisen sie ebenfalls symmetrische und optimal reduzierte induktive Spannungsabfälle mit minimiertem SkinEffekt auf und werden daher insbesondere für längere Strecken eingesetzt. Insbesondere bei Flugzeugen hat die elektrische Versorgung mit Hochfrequenz-Strom bekanntlich den Vorteil, dass dadurch im Flugzeug leichtere Generatoren, Motoren und ähnliche, insbesondere induktiv wirkende Bauelemente bzw. Gerätschaften einsetzbar sind.Such electrical cables are used for the transport of large currents with higher frequencies in aircraft and in the ground. Due to the overall symmetrical structure and the two conductors Split phase design, they also have symmetrical and optimally reduced inductive voltage drops with minimized skin effect and are therefore used in particular for longer distances. Particularly in the case of aircraft, the electrical supply with high-frequency current is known to have the advantage that lighter generators, motors and similar, in particular inductively acting components or equipment can be used in the aircraft.

Bei den bisher bekannten Elektrokabeln dieser Art, wie die BETAjet 400 FRNC-drumflex Andienkabel, ist der Neutral- und/oder Rückleiter als einteiliger, massiver bzw. flexibler Nullleiter ausgebildet, wobei der symmetrische Aufbau des Kabels es mit sich bringt, dass der Nullleiter im Zentrum des Kabels geführt ist. Diese bekannten Elektrokabel genügen vollkommen den Anforderungen, wenn sie fest verlegt werden.In the previously known electrical cables of this type, such as the BETAjet 400 FRNC drumflex Andienkabel, the neutral and / or return conductor is designed as a one-piece, solid or flexible neutral conductor, the symmetrical structure of the cable entails that the neutral conductor in the Center of the cable is guided. These known electrical cables fully meet the requirements when they are laid permanently.

Bei Verwendung des Kabels als flexibles Andienkabel, wie das bei Anwendung desselben als elektrisches Versorgungskabel für Flugzeuge der Fall ist, werden sie bei Nichtgebrauch auf Trommeln gerollt bzw. beim Andocken ans Flugzeug abgerollt und dabei auf dem Asphaltboden oder ähnlichem entlang gezogen. Es besteht dann der Umstand, dass im Zentrum des Kabels eine aktive Einzelader liegt, die durch Torsion einer starken mechanischen Belastung ausgesetzt ist, weil die Versorgungskabel aufgrund des wiederholten Auf- und Abrollens wiederkehrend einer Biegungsbelastung ausgesetzt sind.When using the cable as a flexible umbilical cable, as is the case when using it as an electrical power cable for aircraft, they are when not in use on drums rolled or unrolled while docking with the aircraft and pulled along the asphalt floor or the like. It is then the fact that in the center of the cable is an active single core, which is subjected by torsion of a heavy mechanical load, because the supply cables are repeatedly exposed to a bending load due to the repeated rolling up and down.

Dadurch entsteht die Gefahr, dass der Neutral- und/oder Rückleiter des Kabels durch die starke Biegebeanspruchung beschädigt und das Kabel damit funktionsunfähig wird. In der Vergangenheit ist versucht worden, diesen Nachteil durch einen mechanisch verstärkten Kern im zentralen Nullleiter zu kompensieren. Dennoch kann eine solche Konstruktion je nach Belastung und Lebensdauer des Kabels trotzdem zu einem Bruch der Zentrums-Leiter führen, jedoch zu einem späteren Zeitpunkt als bei vergleichbaren Elektrokabeln mit unverstärktem Zentralleiter.This creates the risk that the neutral and / or return conductor of the cable damaged by the strong bending stress and the cable is thus inoperative. In the past, it has been tried to compensate for this disadvantage by a mechanically reinforced core in the central neutral. Nevertheless, depending on the load and service life of the cable, such a design may still result in breakage of the center conductor, but at a later date than comparable electric cables with unreinforced center conductor.

Bei gattungsmässigen Kabeln weist der Neutralleiter üblicherweise nur den halben Querschnitt der Phasenleiter (mit je 2 Phasen) auf. Insbesondere, weil einphasige asymmetrische Verbraucher mit geschalteten Netzteilen an Bord, im Neutralleiter eine Addition der erzeugten Oberwellen hervorrufen, wird der Skineffekt und damit die Belastung in diesem nachteilig erhöht.For generic cables, the neutral conductor usually has only half the cross section of the phase conductors (each with 2 phases). In particular, because single-phase asymmetrical loads with switched power supply units on board, cause an addition of the generated harmonics in the neutral conductor, the skin effect and thus the load in this disadvantageously increased.

Der Erfindung liegt die Aufgabe zugrunde, ein Elektrokabel der eingangs genannten Art zu schaffen, welches eine optimale Flexibilität und Torsionsresistenz aufweist, aber dennoch optimale elektrische Werte gewährleistet, dies ohne die Gefahr eines Bruches des zentralen Neutral- und/oder Rückleiters. Ferner soll der nachteilige Skineffekt im Neutral- oder Rückleiter unter Beibehaltung des gleichen Durchmessers des Neutralleiters verringert werden.The invention has for its object to provide an electric cable of the type mentioned, which has an optimal flexibility and torsional resistance, but still ensures optimum electrical values, without the risk of breakage of the central neutral and / or return conductor. Furthermore, the adverse skin effect in the neutral or return conductor should be reduced while maintaining the same diameter of the neutral conductor.

Diese Aufgabe ist erfindungsgemäss dadurch gelöst, dass der Neutral- und/oder Rückleiter aus mehreren einzeln isolierten Nullleitern aufgebaut ist, deren Gesamtquerschnitt dem Querschnitt eines einzelnen massiven Zentralleiters annähernd entspricht.This object is achieved according to the invention in that the neutral and / or return conductor is constructed from a plurality of individually insulated neutral conductors whose overall cross-section approximately corresponds to the cross-section of a single solid central conductor.

Durch diese Konstruktion ergibt sich ein Aufbau des Kabelzentrums mit nur einem belastbaren, nicht elektrischen Zentralelement, durch welche bessere mechanische Eigenschaften entstehen, ohne dass das Kabelzentrum mit allen Netralleitern aber dicker als bei herkömmlichen Konstruktionen wird. Dadurch müssen die Phasenisolationen nicht unnötig dicker bemessen werden, um die geometrischen Abmessungen für die Lagenverseilung zu erfüllen.By this construction results in a structure of the cable center with only one resilient, non-electrical central element, through which Better mechanical properties are achieved without the cable center with all Netralleitern but thicker than in conventional constructions. As a result, the phase insulation need not be unnecessarily thicker to meet the geometrical dimensions for the layer stranding.

Durch die erfindungsgemässe Konstruktion des Kabels ist es auch möglich, trotz des mehrteiligen Aufbaus des zentralen Neutralleiters den geringen Induktivitätsbelag beizubehalten, d.h. eine kompakte Leiterkonstruktion zu gewährleisten. Das ist gerade bei 3-phasigen Wechselströmen mit 400 Hz sehr wichtig, da jede Induktivitätserhöhung einen 8mal höheren induktiven Spannungsabfall bewirkt, als dies bei 50Hz-Strömen der Fall wäre. Bei einem respektablen Anteil von harmonischen Oberwellen durch statische Umrichter oder elektronische Verbraucher nimmt die diesbezügliche Wichtigkeit nochmals zu.Due to the construction of the cable according to the invention, it is also possible, despite the multi-part design of the central neutral conductor, to maintain the low inductance coating, i. to ensure a compact ladder design. This is very important especially for 3-phase 400 Hz alternating currents, since each increase in inductance causes an inductive voltage drop 8 times higher than would be the case with 50 Hz currents. With a respectable proportion of harmonic waves through static converters or electronic consumers, the importance of this increases again.

Die neue Kabelkonstruktion erlaubt zugleich eine Redundanz des zentralen Neutral- und/oder Rückleiters, da bei ihm, anders als bei herkömmlichen Konstruktionen mit nur einem massiven Nullleiter praktisch ausgeschlossen ist, dass alle sechs Einzelleiter des mehrteiligen Nullleiters gelichzeitig brechen können. Im Ergebnis wird damit das Risiko eines Nullleiterbruches sehr stark herabgesetzt, da sich kein aktiver Leiter mehr im Zentrum des Elektrokabels befindet und eine mehrfache Redundanz wirksam ist.The new cable design also allows redundancy of the central neutral and / or return conductor, as it is practically impossible, unlike conventional designs with only one solid neutral, that all six individual conductors of the multipart neutral conductor can break at the same time. As a result, the risk of a neutral break is greatly reduced, since there is no more active conductor in the center of the electric cable and a multiple redundancy is effective.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den übrigen Unteransprüchen gekennzeichnet.Further advantageous embodiments of the invention are characterized in the remaining subclaims.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher beschrieben. Es zeigt:

Fig. 1
einen Querschnitt eines erfindungsgemässen Elektrokabels.
The invention will be described below with reference to an embodiment with reference to the drawings. It shows:
Fig. 1
a cross section of an inventive electric cable.

Das in Fig. 1 gezeigte Elektrokabel besitzt einen zentralen Aderverbund als Neutral- und/oder Rückleiter 1 sowie sechs konzentrisch um diese herum gleichmässig verteilt angeordnete Phasenleiter 2a, 2b, 3a, 3b, 4a, 4b, wobei jede Phase auf zwei symmetrisch gegenüberliegende Phasenleiter 2a, 2b, 3a, 3b, bzw. 4a, 4b aufgeteilt ist.This in Fig. 1 The electric cable shown has a central core network as a neutral and / or return conductor 1 and six concentrically distributed around this uniformly distributed phase conductors 2a, 2b, 3a, 3b, 4a, 4b, each phase on two symmetrically opposite phase conductors 2a, 2b, 3a, 3b, and 4a, 4b is divided.

Die sechs Phasenleiter 2a bis 4b haben zum Beispiel einen Querschnitt von 35 mm2 und sind aus blanken und feindrähtigen Kupferlitzen 5 hergestellt. Diese Kupferlitzen 5 sind nach der Norm IEC 60228, mindestens Klasse 5 ausgelegt, wobei jeder Phasenleiter mit einer Isolation 6 aus einer vorzugsweise vernetzten Kunststoffisolation, beispielsweise EPR, versehen ist.The six phase conductors 2a to 4b have, for example, a cross section of 35 mm 2 and are made of bare and finely stranded copper strands 5. These copper strands 5 are designed according to the standard IEC 60228, at least Class 5, wherein each phase conductor is provided with an insulation 6 made of a preferably crosslinked plastic insulation, such as EPR.

Das Elektrokabel ist ferner mit einem Innenmantel 13 aus orangefarbigem Polyurethan als Abriebanzeige sowie einem Aussenmantel 14 aus gelbfarbigem Polyurethan mit dazwischenliegender Faserverstärkung 15 ausgestattet. Selbstverständlich könnten auch andere Farben verwendet werden.The electric cable is further equipped with an inner sheath 13 of orange polyurethane as abrasion display and an outer sheath 14 of yellow polyurethane with intermediate fiber reinforcement 15. Of course, other colors could be used.

Erfindungsgemäss ist das Elektrokabel aus sechs einzeln isolierten Nullleitern 16 mit jeweils einer einzelnen Isolation 19 aufgebaut, wobei die Nullleiter 16 als auch die die Phasenleiter 2a, 2b, 3a, 3b, 4a, 4b je aus einer Vielzahl von Drähten gebildet sind.According to the invention, the electric cable is constructed from six individually insulated neutral conductors 16, each with a single insulation 19, wherein the neutral conductors 16 and the phase conductors 2a, 2b, 3a, 3b, 4a, 4b are each formed from a plurality of wires.

Vorteilhaft sind die Nullleiter 16 mit SRC-Seelen (Special Round Conductor) oder Unilay-Litzen mit einem Querschnitt von je 6 mm2 aufgebaut, also total 36 mm2, was dem Querschnitt eines herkömmlichen nicht aufgeteilten Nullleiters entspricht.The neutral conductors 16 are advantageously constructed with SRC (Special Round Conductor) soils or Unilay strands with a cross section of 6 mm 2 in each case, that is to say totally 36 mm 2 , which corresponds to the cross section of a conventional non-split neutral conductor.

Bei einem bekannten massiven Nullleiter sind üblicherweise eine Anzahl von Litzen seilförmig um ein Zentrum gewunden, die aus Kupferlitzen 8, blank und feindrähtig, mit einer Isolierung 9 aus EPR, vernetzt, hergestellt sind.In a known solid neutral conductor, a number of strands are usually wound in a rope shape around a center made of copper strands 8, bare and finely stranded, with an insulation 9 made of EPR, crosslinked.

Die einzelnen Nullleiter 16 des aufgeteilten Neutral- und/oder Rückleiters 1 sind um ein Zentralelement 17 aus Kunststoffmaterial angeordnet und weisen eine sie umfassende dünne Ummantelung 18 oder Bandierung auf, ebenfalls aus Isoliermaterial. Die Nullleiter 16 sind aus feindrähtigen Kupferlitzen hergestellt und mit einer Isolation 19 aus einem vorzugsweise vernetzten Kunststoff, zum Beispiel einem Polyolefin Copolymer, dünnwandig und elektronenstrahlvernetzt einzeln isoliert.The individual neutral conductors 16 of the split neutral and / or return conductor 1 are arranged around a central element 17 made of plastic material and have a thin sheathing 18 or banding comprising them, likewise made of insulating material. The neutral conductors 16 are made of finely stranded copper strands and isolated individually with an insulation 19 made of a preferably crosslinked plastic, for example a polyolefin copolymer, thin-walled and electron-beam crosslinked.

Durch den erfindungsgemässen Aufbau des zentralen Neutral- und/oder Rückleiters 1 kann gegenüber dem Stand der Technik das Risiko eines Zentralleiterbruchs stark verringert werden, ohne den Gesamtquerschnitt des Kabels zu verändern und dessen hervorragenden elektrischen Eigenschaften negativ zu beeinflussen. Da praktisch nicht alle sechs einzelnen Nullleiter 16 gleichzeitig brechen können, ergibt sich eine mehrfache Redundanz des erfindungsgemäss aufgeteilten Nullleiters, die eine starke Reduzierung des Risikos eines Nullleiterbruchs mit sich bringt, zumal im geometrischen Zentrum des Kabels kein aktiver Leiter vorhanden ist.As a result of the design of the central neutral and / or return conductor 1 according to the invention, the risk of central conductor breakage can be greatly reduced compared to the prior art without changing the overall cross section of the cable and adversely affecting its excellent electrical properties. Since virtually all six individual neutral conductors 16 can not break at the same time, there results a multiple redundancy of the neutral conductor divided according to the invention, which entails a great reduction in the risk of a neutral conductor break, especially since no active conductor is present in the geometric center of the cable.

Das Elektrokabel umfasst im Rahmen der Erfindung zwischen den benachbarten Phasenleitern 2a, 2b, 3a, 3b, 4a, 4b aussenseitig zusätzlich gleichmässig über den Umfang verteilte Aussenspickel 10, welche Spickelleiter 11 als Vierer von je 4x1 mm2 aufweisen, die auch aus feindrähtigen Kupferlitzen mit je einer Isolation 12 aus einer wiederum vorzugsweise vernetzten Kunststoffisolation versehen sind.The electric cable comprises within the scope of the invention between the adjacent phase conductors 2a, 2b, 3a, 3b, 4a, 4b on the outside additionally uniformly distributed over the circumference outside picks 10, which have spiked conductors 11 as fours each 4x1 mm 2 , which also made of fine-stranded copper strands with each one insulation 12 are provided from a turn preferably crosslinked plastic insulation.

Vorteilhaft ist die Verseilrichtung der isolierten Nulleiter 16 gleich zu wählen wie diejenige der Phasenleiter 2a,2b,3a,3b,4a,4b. Die Schlaglängen sind dabei derart zueinander bemessen, dass bei Torsion die Längenänderungen der innenliegenden Nullleiter annähernd gleich wie diejenigen der äusseren Phasenleiter sind.Advantageously, the stranding direction of the insulated neutral conductors 16 is the same as that of the phase conductors 2a, 2b, 3a, 3b, 4a, 4b. The lay lengths are dimensioned to each other such that in torsion, the changes in length of the inner neutral conductor are approximately equal to those of the outer phase conductors.

Als Variante können zusätzliche Neutralleiter in den Aussenspickeln des Kabels enthalten sein, mittels denen eine weitere Erhöhung des Gesamtquerschnitts des Neutral- und/oder Rückleiters zum Beispiel auf den vollen Phasenquerschnitt ermöglichen.As a variant, additional neutral conductors may be included in the outer spikes of the cable, by means of which allow a further increase in the total cross-section of the neutral and / or return conductor, for example, on the full phase cross-section.

Claims (12)

  1. An electrical cable for supplying electricity to an aircraft, an engine or similar, for at least partially higher frequencies of preferably 400 Hz, comprising a central neutral and/or return conductor (1) and at least a number of phase conductors (2a, 2b, 3a, 3b, 4a, 4b) arranged in a concentrically distributed manner about the latter, characterised in that the central neutral and/or return conductor (1) is made up of a number of neutral wires (16) each with individual insulation (19), the neutral wires (16) and the phase conductors (2a, 2b, 3a, 3b, 4a, 4b) each being formed from a plurality of wires.
  2. The electrical cable according to Claim 1, characterised in that the number of, preferably six, neutral wires (16) are arranged about a non-electrically conductive central element (17).
  3. The electrical cable according to Claim 1 or 2, characterised in that the neutral wires (16) are each produced from one or more strands with a high degree of filling from the thin wires with a copper structure.
  4. The electrical cable according to Claim 3, characterised in that the respective neutral wires (16) are produced from SRC strands or Unilay strands.
  5. The electrical cable according to any of the preceding Claims 1 to 4, characterised in that the neutral wires (16) are made of twisted wires with a diameter of between 0.05 mm and 0.75 mm.
  6. The electrical cable according to any of the preceding Claims 1 to 5, characterised in that the respective neutral wires (16) are made of bunched strands without a geometric structure, each with a plurality of wires, for example between 700 and 800 with a cross-section of 6 mm2, and these are surrounded by a film as insulation (19).
  7. The electrical cable according to any of the preceding Claims 1 to 6, characterised in that the neutral wires (16) are each provided with very thin and cross-linked insulation (19) made of plastic and which has a wall thickness of 0.1 mm to 1 mm.
  8. The electrical cable according to any of the preceding Claims 1 to 7, characterised in that at least one outer thin cable (10) each with a number of conductors (11) are respectively guided on the outside between the adjacent phase conductors (2a, 2b, 3a, 3b, 4a, 4b).
  9. The electrical cable according to Claim 8, characterised in that preferably four conductors (11), each provided with insulation (12), can respectively be used for measuring, control and/or regulation purposes.
  10. The electrical cable according to any of the preceding Claims 1 to 9, characterised in that the phase conductors (2a, 2b, 3a, 3b, 4a, 4b), that are each distributed over two symmetrically opposing phase conductors (2a, 2b, 3a, 3b or 4a, 4b), and the additional conductors (11) are enclosed by an inner sheath (13) made of a coloured plastic surrounding the latter and an outer sheath (14) surrounding the latter made of a plastic of a different colour.
  11. The electrical cable according to any of the preceding Claims 1 to 10, characterised in that the stranding direction of the neutral wires (16) runs in the same direction as that of the phase conductors (2a, 2b, 3a, 3b, 4a, 4b).
  12. The electrical cable according to Claim 11, characterised in that the lay lengths are determined in relation to one another such that with torsion the length changes of the neutral wires (16) lying on the inside are approximately the same as those of the phase conductors (2a, 2b, 3a, 3b, 4a, 4b).
EP15750696.5A 2014-08-11 2015-08-10 Electrical cable Active EP3180794B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01213/14A CH709972B1 (en) 2014-08-11 2014-08-11 Electrical cable.
PCT/EP2015/068394 WO2016023872A1 (en) 2014-08-11 2015-08-10 Electrical cable

Publications (2)

Publication Number Publication Date
EP3180794A1 EP3180794A1 (en) 2017-06-21
EP3180794B1 true EP3180794B1 (en) 2018-07-11

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EP15750696.5A Active EP3180794B1 (en) 2014-08-11 2015-08-10 Electrical cable

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US (1) US10049790B2 (en)
EP (1) EP3180794B1 (en)
JP (1) JP2017525119A (en)
CN (1) CN107148656B (en)
CH (1) CH709972B1 (en)
WO (1) WO2016023872A1 (en)

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CH709972B1 (en) 2014-08-11 2018-12-14 Studer Christoph Electrical cable.
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JP2021022491A (en) * 2019-07-29 2021-02-18 モレックス エルエルシー Composite cable

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Also Published As

Publication number Publication date
CN107148656B (en) 2019-10-01
EP3180794A1 (en) 2017-06-21
US10049790B2 (en) 2018-08-14
CH709972A2 (en) 2016-02-15
CH709972B1 (en) 2018-12-14
WO2016023872A1 (en) 2016-02-18
JP2017525119A (en) 2017-08-31
CN107148656A (en) 2017-09-08
US20170229215A1 (en) 2017-08-10

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