EP2842141B1 - Selbsttragende elektrische leitung - Google Patents

Selbsttragende elektrische leitung Download PDF

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Publication number
EP2842141B1
EP2842141B1 EP12718172.5A EP12718172A EP2842141B1 EP 2842141 B1 EP2842141 B1 EP 2842141B1 EP 12718172 A EP12718172 A EP 12718172A EP 2842141 B1 EP2842141 B1 EP 2842141B1
Authority
EP
European Patent Office
Prior art keywords
cable
self
layer
adhesive
electrical 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.)
Active
Application number
EP12718172.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2842141A1 (de
Inventor
Alexander Gregori
Martin Mairinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP2842141A1 publication Critical patent/EP2842141A1/de
Application granted granted Critical
Publication of EP2842141B1 publication Critical patent/EP2842141B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01B7/1895—Internal space filling-up means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H01F27/2828—Construction of conductive connections, of leads

Definitions

  • the invention relates to a self-supporting electrical line for an electrical machine, in particular for a transformer or a choke, with a plurality of layers of line strands, each consisting of individual wires.
  • the winding of the transformer usually consists of one or more solid wires, usually of copper.
  • solid conductors or flexible cable strands so-called “stranded wire”, are used, each consisting of bare, non-insulated or mutually insulated, continuously stranded individual wires or strands.
  • connecting lines In order to give solid connecting lines the desired spatial shape when manufacturing a transformer, the solid conductors must be bent, which requires a corresponding expenditure of force and complex bending devices.
  • connecting lines which consist of flexible and stranded individual wires, are overall more flexible and thus easier to handle in the manufacturing process.
  • connection lines in transformer construction should be as flexible as possible so that it can be easily adapted to the desired spatial shape.
  • the connecting line should be as rigid as possible in order to be able to absorb short-circuiting forces without the need for complex support devices.
  • the document JP S59-3507 U discloses a curable electrical lead for a transformer.
  • the invention is based on the object of specifying a self-supporting electrical line which is as flexible as possible during the production process of an electrical machine, but which is sufficiently rigid in the operating case in order to absorb the forces acting in the event of a short circuit as independently as possible without the need for complex devices for support are.
  • the approach according to the invention is based on a self-supporting electrical line, in which a layer with a hardenable polymeric substance is provided between individual layers of conductor strands and each individual wire from which a line strand is formed is coated with such a substance which, when used as intended
  • the line is hardened and gives it a self-supporting property.
  • the individual wires can be electrically insulated from one another or can also be bare. For example, copper or aluminum can be used as the conductor material.
  • the polymeric fabric can be a thermoset, e.g. an adhesive. On the one hand, this means that the electrical cable can be easily brought into the desired spatial shape during assembly (the polymer material has not yet hardened). On the other hand, after assembly, in a hardened state of the adhesive, the bond between the individual cable strands or individual wires is so strong that the cable can be installed freely over long distances, so that comparatively few supports are required.
  • a heat treatment is carried out anyway in order to remove the moisture from the cellulose insulation.
  • This heat treatment is now also used to harden the adhesive.
  • the polymer material At a temperature of around 100 ° C to below 140 ° C, the polymer material first becomes soft and can therefore easily penetrate between adjacent and bundled wires of a cable strand. The subsequent cooling causes the polymer material (for example adhesive) to harden, as a result of which the individual strands or strands of the cable strand connect to one another by cohesion.
  • the flexible pipe at the beginning of the manufacturing process becomes a self-supporting, largely rigid pipe after the heat treatment.
  • the composition of the polymer material adheresive
  • it could also be cured differently, for example by removing oxygen.
  • the curing of the polymeric material at the end of the flexible line at the end of the manufacturing process has a mechanical property that is similar to a solid copper conductor of the same cross-section.
  • connecting lines with which a connection between the windings or a feedthrough is made through the housing can therefore be made more cost-effectively.
  • the connecting lines can initially be easily shaped during assembly. They acquire their self-supporting or self-supporting properties after the heat treatment, which is carried out during the production anyway. This makes the manufacturing process easier because there is no need for complex devices for bending the solid copper conductors or supporting devices that are required when flexible lines are in operation.
  • the layer between the individual layers is designed as a wrapping that is impregnated with a thermosetting resin.
  • the resin can thus be introduced into the line without great effort.
  • Epoxy resin is particularly suitable.
  • the wrapping is made from a paper strip which has been previously coated or impregnated with a resin.
  • the wrapping or wrapping is designed differently when viewed in the longitudinal direction of the line.
  • This allows the mechanical Adapt the properties of the self-supporting line very well. This can be achieved, for example, by a correspondingly overlapping wrapping or by wrapping next to one another.
  • the banding can also be carried out at a distance from one another, as a result of which less rigidity can be achieved.
  • the self-supporting property can be increased or decreased in certain sections, for example, depending on the forces to be expected in the event of a short circuit.
  • epoxy resin is very suitable as an adhesive. Due to the capillary action, epoxy resin is able to penetrate the cable mesh very well and to glue the individual strands of a cable strand together.
  • the cladding or covering is formed from a strip-shaped fleece, a woven or knitted fabric made from polyester, glass fiber or another material.
  • the layer between adjacent layers could also be formed by a paper wrapping which was coated with a polymer material, e.g. coated or soaked with an adhesive.
  • a polymer material e.g. coated or soaked with an adhesive.
  • a particular advantage of the invention can result in the manufacture of a transformer or a choke of high power, a line according to claims 1 to 6 being used for connecting the winding ends to a control device or to external connections of the machine.
  • the Figure 1 shows a cross-sectional view of a self-supporting electrical line 1, which is formed from individual cable strands 2, each consisting of distributed individual wires 3 (copper strands).
  • the line strands 2 are arranged concentrically in three layers.
  • Arranged concentrically around an inner layer 6 is an arrangement of six line strings 7, and around this in turn an arrangement of twelve cable strands in an outer layer 8.
  • a layer 4 and 5 is arranged between the inner layer 6 and the middle layer 7, and between the layers 8 and 7.
  • Each of these layers 4 and 5 functions as a carrier of a polymer material (plastic), here an adhesive.
  • the carrier is a wrapping made of polyester fleece soaked in epoxy resin.
  • the polyester fleece has an overlap. In practice it has been shown that an overlap between 20% and 40% is favorable. It has also proven to be advantageous if the individual wires 3 are coated with epoxy resin, for example in each case with layer thicknesses between 10 ⁇ m and 20 ⁇ m.
  • a polyester fleece it is also possible to use a polymer material or separate paper wrapping.
  • the self-supporting conductor assembly is produced by the action of heat.
  • the heat treatment takes place at about 125 ° C over a period of 24 hours.
  • the epoxy resin penetrates in a thin, fluid state between the individual strands 3 of a wiring harness 2.
  • the adhesive connection creates the desired self-supporting line assembly, so that this line can be installed over long distances, for example in a transformer, as is typically used in energy distribution networks.
  • the use of the invention in power transformers is particularly advantageous.
  • FIG. 2 Another embodiment of a self-supporting line 1 can be seen in a perspective view.
  • the layers 4, 5 are formed by a paper wrapping 9 soaked in epoxy resin.
  • the individual cable runs 2 are in each case stranded.
  • the stranding of the cable runs 2 is right-handed, in the middle layer 7 left-handed and in the outer layer 8 right-handed again.
  • the banding is arranged in the layers 4, 5 at a spiral distance between the individual layers.
  • the Figure 3 shows a look inside a power transformer.
  • the transformer has a soft magnetic core 15 with several legs. Each of the legs carries a winding arrangement 11.
  • Connecting lines 10 lead from the connections of the winding arrangement 11 to a regulating or adjusting device 13.
  • the connecting lines 10 run in Figure 3 horizontal over long distances. The largely straight line course then changes into a strong curvature 12. Some of the connecting lines 10 also lead to line bushings, which in Figure 3 are not shown.
  • connecting lines 10 have so far been designed as insulated copper rods or copper bars.
  • these connecting lines 10 are designed as a self-supporting electrical cable ("self supporting lead cable”), that is to say the interconnection is now carried out by means of self-supporting copper cables.
  • connecting lines 10 run freely between adjacent supports 14 which are relatively far apart.
  • the production of bends 12 can easily be carried out manually during assembly, since the connecting lines 10 are sufficiently flexible, especially since the adhesive has not yet hardened. No bending tools are required.
  • the transformer After the assembly of the connecting lines 10 and at the end of the manufacturing process, the transformer is in one Drying oven heated to a temperature of about 120 ° Celsius.
  • the epoxy resin contained in the connecting lines 12 hardens. This gives the installed connecting lines 10 the desired rigidity.
  • any auxiliary support devices attached can be removed again, so that the transformer can be manufactured more cost-effectively.
  • the desired hardening of the installed connecting lines 10 occurs due to the action of heat.
  • the hardening of the resin gives the connecting lines 10 a self-supporting property.
  • the network of lines is able to absorb the forces that occur in the event of a short circuit to a large extent.
  • the cost savings in the manufacture of the transformer result on the one hand from the fact that no complex bending devices are required for bending solid copper lines.
  • the interconnection with the flexible connecting lines 10 requires comparatively little manual effort.
  • the invention can be used with particular advantage in the construction of power transformers.
  • the connecting lines 10 are supported by supports 14.
  • the connecting lines 10 run cantilevered between the individual supports 14.
  • the heat treatment of the transformer gives the connecting lines 10 in the network such stability that the distance between the individual supports 14 can be chosen to be very large compared to the unstabilized state.
  • FIG 4 Another embodiment of the invention is shown, in which you can see a conductor with a spiral banding with an axial distance between the individual turns in a side view.
  • the individual wires are round wires, which in turn result in round cable strands due to stranding / twisting.
  • Both the cross-sectional shape of the individual wires and the cross-sectional shape of the cable strands can differ from the example shown.
  • Copper is used as the material for the conductor here, but of course the individual wires can also consist of aluminum or another electrically conductive material.
  • the individual conductors of the copper cable are bare, i.e. not electrically insulated from one another.
  • the invention can also be used when the individual wires are electrically insulated from one another.
  • epoxy resin instead of epoxy resin, another suitable adhesive can of course also be used.
  • the heat for curing the polymer material can be introduced through an oven, but also partially on the connecting line.
  • various absorbent materials can be considered as carriers for the adhesive, for example fleece, knitted fabrics and woven fabrics.
  • the individual wires can be coated with adhesive by spraying or dipping.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)
EP12718172.5A 2012-04-24 2012-04-24 Selbsttragende elektrische leitung Active EP2842141B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/057487 WO2013159813A1 (de) 2012-04-24 2012-04-24 Selbsttragende elektrische leitung

Publications (2)

Publication Number Publication Date
EP2842141A1 EP2842141A1 (de) 2015-03-04
EP2842141B1 true EP2842141B1 (de) 2020-03-11

Family

ID=46025681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12718172.5A Active EP2842141B1 (de) 2012-04-24 2012-04-24 Selbsttragende elektrische leitung

Country Status (5)

Country Link
EP (1) EP2842141B1 (forum.php)
KR (1) KR20150005651A (forum.php)
CN (1) CN104246926B (forum.php)
IN (1) IN2014DN08102A (forum.php)
WO (1) WO2013159813A1 (forum.php)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014201992A1 (de) * 2014-02-04 2015-08-06 Leoni Bordnetz-Systeme Gmbh Elektrische Leitung sowie Verfahren zur Herstellung eines elektrischen Leitungsbündels
DE102023104523A1 (de) * 2023-02-24 2024-08-29 Brusa Elektronik Ag Hauptspulenbaugruppe für ein Bodenmodul GPM oder für ein Fahrzeugmodul CPM eines induktiven Ladesystems für ein Fahrzeug

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS593507U (ja) * 1982-06-30 1984-01-11 株式会社日立製作所 油入電器のリ−ド線

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151260A (en) * 1959-12-08 1964-09-29 Gen Electric Arrangement for insulating coil leads and spacing end turns in a dynamoelectric machine
JPS5678343A (en) * 1979-11-29 1981-06-27 Matsushita Electric Ind Co Ltd Resin molded motor
JPS61121306A (ja) * 1984-11-16 1986-06-09 Mitsubishi Electric Corp 静止誘導機器
US4675474A (en) * 1985-09-04 1987-06-23 Harvey Hubbell Incorporated Reinforced electrical cable and method of forming the cable
US4761519A (en) * 1987-01-29 1988-08-02 Precision Interconnect Corporation Highly flexible, shielded, multi-conductor electrical cable
SE461941B (sv) * 1988-08-30 1990-04-09 Asea Brown Boveri Elektrisk ledare med en omgivande isolering samt anvaendning av ledaren i en haerva
JP2000123646A (ja) * 1998-10-15 2000-04-28 Towa Denki Seisakusho:Kk 水中灯用ケーブル
JP2001291441A (ja) * 2000-04-05 2001-10-19 Hitachi Cable Ltd 酸化物超電導導体、酸化物超電導導体用素線及びそれらの製造方法
US20070132537A1 (en) * 2005-12-08 2007-06-14 General Electric Company Transformer and method of assembly
CN202394574U (zh) * 2011-11-18 2012-08-22 特变电工股份有限公司 一种承荷探测电缆

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS593507U (ja) * 1982-06-30 1984-01-11 株式会社日立製作所 油入電器のリ−ド線

Also Published As

Publication number Publication date
CN104246926B (zh) 2017-09-15
WO2013159813A1 (de) 2013-10-31
IN2014DN08102A (forum.php) 2015-05-01
CN104246926A (zh) 2014-12-24
EP2842141A1 (de) 2015-03-04
KR20150005651A (ko) 2015-01-14

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