• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The power transmission device according to the invention has at least one three-phase cable (1), with a central protective conductor (2) around which the phase conductor (3, 4, 5) are stranded. At least two identical phase conductors (3, 4, 5) are present per phase, each of which together form a two-part or multi-part phase conductor (3, 4, 5), for which purpose they are electrically conductively connected to each other at at least two connection points. The distance (8) between these connection points corresponds to a multiple of the lay length of the stranding. In a preferred embodiment, six phase conductors (3, 4, 5) are arranged mirror-symmetrically, wherein the three associated and each phase associated phase conductors (3, 4, 5) in each case diametrically opposite each other on an axis of symmetry (D), through the protective conductor ( 2) leads. The distance (R) between the center (Z) of the protective conductor (2) and the respective center (M) of the phase conductors (3, 4, 5) is equal to the distance (S) between the centers (M) of adjacent phase conductors (3, 4, 5), ie one side of an imaginary hexagon formed thereby. Preferably, an RF shield (10) is present. This three-phase cable (1) is characterized by an extremely low magnetic field radiation. It is induction-free with respect to the protective conductor (2) and has a very high efficiency with a small cross section. For example, it can be used between frequency converters and motors.
    公开号:CH712791A2
    申请号:CH01016/16
    申请日:2016-08-06
    公开日:2018-02-15
    发明作者:Fischbacher Christian
    申请人:Cfw Emv Consulting Ag；
    IPC主号:
    专利说明:

    Description: The present invention relates to a power transmission device with at least one three-phase cable.
    In particular, it is a cable, or power cable for three-phase current. Such cables are also known as three-phase cables. For example, this three-phase cable should be usable between the frequency converter and motors where special requirements are placed.
    Previously known three-phase cables have, for example, several phase conductors stranded around a cable core. Solutions with three phase and three protective conductors are also known. These constructions are sometimes sufficient in networks for low-frequency three-phase current. In the case of medium-frequency three-phase current and in particular in the example above, however, a number of considerable disadvantages arise. Among other things, there are relatively high transmission losses, problematic induction currents and magnetic field radiation.
    On the basis of these findings, the invention has for its object to provide a power transmission device with at least one three-phase cable, in which the disadvantages mentioned can be largely avoided.
    The power transmission device according to the invention corresponds to the characterizing features of claim 1. Further advantageous developments of the inventive concept can be seen from the dependent claims.
    From approximately 35 mm 2 conductor cross-section, the effective resistance increases with alternating current due to the skin and proximity effect. By dividing a single phase conductor into several sub-conductors, one can counteract these effects. For example, 2 x 95 mm 2 can transmit at least as much current as 1 x 240 mm 2 . This means less copper consumption, making it lighter, more flexible and cheaper. The three-phase cable is additionally shielded for use with frequency converters. This shield attenuates the electromagnetic field radiation up to 30 MHz by at least 80 dB.
    A preferred embodiment of the invention is described below with reference to the drawing.
    Fig. 1 shows a section through the three-phase cable of the power transmission device;
    Fig. 2 shows, purely schematically, the mutually assigned phase conductors.
    In the present example, the power transmission device has a three-phase cable 1, with a central, in the drawing also marked with PE protective conductor 2, around which a plurality of phase conductors 3, 4 and 5 are grouped. The centrally routed protective conductor 2 must not be a live conductor, but only a PE conductor.
    It is essential for the invention that at least two identical phase conductors 3 or 4 or 5 are present per phase. These pairings are also identified in the drawing as L1a / L1b, L2a / L2b and L3a / L3b. This means that the three pairs each form a two-part phase conductor 3, 4 and 5 for one phase each. Accordingly, three phases are present in the illustrated embodiment. This arrangement solves the problem of induction on the protective conductor 2.
    The respectively associated phase conductors 3, 4 and 5 of a phase of the current transmission device are electrically conductively connected to one another at at least two connection points 6 and 7. This will preferably be the case at the cable ends, as is indicated purely schematically in FIG. 2. 2 is otherwise not decisive for the arrangement of the phase conductors 3, 4 and 5 and of the protective conductor 2, which is only indicated in any case. Not shown in FIG. 2 is the technically known stranding of the phase conductors 3, 4 and 5. These are stranded around the protective conductor 2 in such a way that the latter forms a continuous cable core. The lay length of the stranding is preferably a maximum of 1 m, this being dependent on the cross section of the three-phase cable 1. The distance 8 between the at least two connection points 6 and 7 corresponds to a multiple of the lay length of the stranding. Example: if the lay length is 0.5 m, then this distance 8 will be at least 1 m; or 1.5 m, 2 m, 2.5 m and so on. This measure solves the mutual induction problem.
    The phase conductors 3, 4 and 5 are, viewed in the cable cross section, arranged mirror-symmetrically so that the associated phase conductors 3 or 4 or 5, each associated with a common phase, are diametrically opposite to each other on an axis of symmetry D, which is approximately through the center Z of the protective conductor 2 leads.
    If you connect the respective center M of the six phase conductors 3, 4 and 5 of this embodiment, there is an imaginary hexagon. The distance R between the center Z of the protective conductor 2 and the respective center M of the phase conductors 3, 4 and 5, that is to say the radius, is equal to the distance S between the centers M of adjacent phase conductors 3-4, 4-5 or 3-5, one side of the imaginary hexagon. This means that the distances R between the phase conductors 3, 4 and 5 on the one hand and the protective conductor 2 on the other hand and the six distances S between adjacent phase conductors are equal to one another. So R is equal to S.
    At least the phase conductors 3, 4 and 5 should be of the same cross-section. The protective conductor 2 preferably also has the same cross section as the phase conductor.
    CH 712 791 A2 The phase conductors 3, 4 and 5 can, as shown here and are technically known, each be provided with a non-conductive insulation. An insulating cable sheath that fills the spaces is also possible.
    In a preferred embodiment, however, a shield 10 is present between the phase conductors 3, 4 and 5 on the one hand and the cable sheath 9 on the other hand. As a result, the three-phase cable 1 and / or its surroundings are shielded against electrical and / or electromagnetic fields. For example, RF shielding against high-frequency radiation is used.
    Because of the skin effect, the double or two-part phase conductors 3, 4 and 5 can be chosen to be smaller in cross section than would be the case if only one phase conductor were used. This not only makes the cross-section of the three-phase cable 1 smaller, which is favorable when it is installed in cable ducts and the like, but also results in a cost saving and, moreover, a weight saving. The latter is a welcome plus in the application example in engine technology mentioned above.
    The current transmission device according to the invention with at least one three-phase cable offers the following enormous advantages:
    - extremely low magnetic field radiation,
    - induction-free towards the protective conductor,
    - low RF radiation,
    - highest efficiency,
    - the smallest possible losses,
    - smaller cross section.
    It is within the scope of the invention according to claim 1, the three-phase cable 1, its protective conductor 2, the phase conductors 3, 4 and 5 and / or the cable jacket 9 and / or the shield 10 in detail differently than this in the purely schematic Drawing is shown.
    It is theoretically conceivable to break down each phase into more than two phase conductors. Likewise, there could be more than one protective conductor 2. The phase conductors 3, 4 and 5 and / or the protective conductor 2 do not necessarily have to have a circular cross section. The cross-section of the three-phase cable 1 does not have to correspond to that shown.
    Depending on the use of the three-phase cable 1, it is also not excluded, for example, to use more than three double-phase conductors, that is to say more than six phase conductors 3, 4 and 5. For example, this could be four double-phase conductors, ie a total of eight phase conductors. In practice, however, this makes less sense, since the equality R equal to S, which has proven to be particularly advantageous in laboratory measurements, only comes into play in the six-variant with the imaginary hexagon.
    The power transmission device can also have more than one three-phase cable 1.
    In any case, it is useful if the individual phases are assigned a color, as is known per se. For example, brown for the phase conductor (s) 3, light gray for the phase conductor (s) 4 and black for the phase conductor (s) 5. The protective conductor 2 is green / yellow.
    权利要求:
    Claims (10)
    [1]
    claims
    1. Power transmission device with at least one three-phase cable (1), characterized by at least one protective conductor (2) around which a plurality of phase conductors (3, 4, 5) are stranded, with at least two identical phase conductors (3, 4, 5 ) are present, each of which together form a two-part or multi-part phase conductor (3, 4, 5) for each phase, for which purpose the at least two identical phase conductors (3, 4, 5) each have at least two connection points (6, 7) are connected to one another in an electrically conductive manner and the distance (8) between these at least two connection points (6, 7) corresponds to a multiple of the lay length of the stranding.
    [2]
    2. Power transmission device according to claim 1, characterized in that the lay length of the stranding of the phase conductors (3, 4, 5) around the protective conductor (2) is a maximum of 1 m.
    [3]
    3. Power transmission device according to claim 1 or 2, characterized in that the phase conductors (3, 4, 5) of the at least one three-phase cable (1), viewed in a cable cross-section, are arranged mirror-symmetrically, the phase conductors belonging together and each being assigned to a common phase ( 3, 4, 5) are diametrically opposite each other on an axis of symmetry (D) which leads through the protective conductor (2).
    [4]
    4. Power transmission device according to one of claims 1-3, characterized in that in at least one three-phase cable (1) there are a total of six phase conductors (3, 4.5), two of which together form a phase, ie a total of three phases.
    [5]
    5. Power transmission device according to claim 4, characterized in that the six phase conductors (3, 4, 5) viewed in the cable cross section are arranged such that by connecting the respective center (M) of the six phase conductors (3, 4, 5) to one another by a imaginary line results in an imaginary hexagon.
    CH 712 791 A2
    [6]
    6. Power transmission device according to claim 5, characterized in that the respective distances between the individual phase conductors (3, 4, 5) are equal to one another.
    [7]
    7. Power transmission device according to one of claims 1-6, characterized in that the phase conductors (3, 4, 5) are of the same cross section.
    [8]
    8. Power transmission device according to claim 7, characterized in that the protective conductor (2) has the same cross section as the phase conductor (3, 4, 5).
    [9]
    9. Power transmission device according to one of claims 5-8, characterized in that a distance (R) between a center (Z) of the protective conductor (2) and the respective center (M) of the phase conductors (3, 4, 5) is equal to a distance (S) between the centers (M) of adjacent phase conductors (3, 4, 5), that is, a respective side of the imaginary hexagon.
    [10]
    10. Power transmission device according to one of claims 1-9, characterized in that between the phase conductors (3, 4, 5) on the one hand and a cable sheath (9) on the other hand there is a shield (10), for example an HF shield against high-frequency radiation.
    CH 712 791 A2
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    同族专利:
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    引用文献:
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    DE2938864C2|1979-09-26|1986-02-20|Anton Piller GmbH & Co KG, 3360 Osterode|Circuit arrangement for distribution networks for medium frequency three-phase current|
    ES2373373T3|2006-06-14|2012-02-02|Cfw Emv-Consulting Ag|HIGH INTENSITY CABLE.|
    CN102969065B|2012-11-16|2014-12-10|江苏远洋东泽电缆股份有限公司|400Hz in-parallel balanced structure cable for ships and manufacture method thereof|
    CN203706703U|2013-12-25|2014-07-09|特变电工电缆股份有限公司|Cable for transmitting electricity to airplane|
    CN204463864U|2015-01-28|2015-07-08|江苏中煤电缆有限公司|A kind of naval vessel flexible shielding intermediate frequency flexible cable|EP3910650A4|2020-05-11|2021-11-17|Lapp Eng & Co|Shore-to-ship cable|
    法律状态:
    优先权:
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    EP17001258.7A| EP3279901A1|2016-08-06|2017-07-24|Current transmission device with at least one ac cable|
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