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
• Cable for an electric machine in particular for a transformer or a choke, with several layers of
• Line strands each consisting of individual wires.
• the winding of the transformer usually consists of one or more solid wires, usually made of copper.
• solid wires usually made of copper.
• stranded wire To connect the individual windings of the transformer with a control device or with external terminals either solid conductors or flexible strands of wire, so-called “stranded wire” are used, each consisting either bare, not insulated or mutually insulated, continuously stranded strands or strands.
• the massive ladder must be bent, which is a
• connecting lines which consist of flexible and stranded individual wires, overall more flexible and thus easier to handle in the manufacturing process.
• stranded wire connection lines however, the problem arises that in the event of a short circuit on the
• connection lines in transformer construction: during assembly, the line should be as flexible as possible, so that it can be adapted as simply as possible to the desired spatial form.
• the connecting line When operating the transformer, the connecting line should be as rigid as possible in order to be able to absorb short-circuit forces, without the need for complex support devices.
• the invention is based on the object, a
• a self-supporting electrical line having the features of claim 1, or by a method for producing an electrical line with the features of claim 7, and by an electrical transformer according to claim 11, or by a method for producing a transformer according to the features of claim 12.
• the inventive approach is based on a self-supporting electrical line in which between layers of conductor strands a layer is provided with a curable polymeric material and / or each individual wire from which a wiring harness is formed, with such a substance
• the individual wires can be electrically isolated from each other or blank.
• a conductor material for example, copper or aluminum can be used.
• the polymeric material may be a thermosetting material, e.g. an adhesive. This achieves, on the one hand, that the electrical line during the
• Line strands or individual wires so strong that the line over long distances can be installed freely supporting, so that comparatively few supports are required.
• the polymer material is initially soft and can thus easily penetrate between adjacent and bundled wires of a wiring harness.
• the subsequent cooling causes curing of the polymer material (for example, adhesive), which causes the individual wires or strands of the wiring harness
• Heat treatment to a self-supporting, largely rigid line Depending on the composition of the polymer material (adhesive), its curing could also be brought about differently, for example by removal of oxygen. As a result, by curing the polymeric material, the initially flexible conduit at the end of the manufacturing process has a mechanical property similar to a solid copper conductor of the same cross-section.
• connecting lines with which a connection between the windings or a passage through the housing is made can be carried out more cheaply.
• the connecting lines can be easily brought into shape during assembly first. Their self-supporting or free-bearing property they get after the heat treatment, which is carried out anyway in the manufacture. As a result, the manufacturing process is easier, because it eliminates expensive devices for bending the massive copper conductors or support devices that are required in the operation of flexible lines away.
• the layer between the individual layers is formed as a wrapping, which is impregnated with a thermosetting resin.
• the resin can be introduced into the line without great effort.
• Epoxy resin is particularly suitable.
• the envelope or wrapping is designed differently. This allows the mechanical Adapt the properties of the self-supporting cable very well. This can be done, for example, by an appropriate
• the Umbandelung can also be performed with distance from each other, creating a smaller
• Stiffness can be achieved. Depending on the design, it is possible to adapt the self-supporting property along the line to the respective requirements.
• Self-supporting property can be increased or decreased, for example, in certain sections, depending on which forces are to be expected in the event of a short circuit.
• epoxy resin is very suitable as an adhesive. Epoxy resin can through the
• the casing or sheath is formed from a strip-shaped fleece, a woven or knitted fabric made of polyester, glass fiber or another material.
• the layer between adjacent layers is an epoxy resin-reinforced polyester nonwoven layer.
• the layer between adjacent layers could also be formed by a paper wrapper covered with a polymeric material, e.g. an adhesive is coated or impregnated. This design is comparative
• Figure 1 shows a cross section through an inventive
• Figure 2 is a perspective view of another
• Winding and a control switch is formed using a line according to the invention.
• Figure 4 is a side view of the self-supporting
• FIG. 1 shows in a cross-sectional illustration a self-supporting electrical line 1, which consists of individual ones
• Line strands 2 is formed, each consisting of distributed individual wires 3 (copper strands).
• the strands 2 are arranged concentrically in three layers in this example. Concentrically around an inner layer 6, an arrangement of six line strands 7, and As can be easily seen from the drawing of FIG. 1, a layer 4 or 5 is disposed between the inner layer 6 and the middle layer 7 and between the layers 8 and 7 , Each of these layers 4 and 5 acts as a carrier of a polymeric material
• the carrier is a wrap of impregnated with epoxy resin polyester fleece.
• Polyester fleece has an overlap. In practice it has been shown that an overlap between 20% to 40% is favorable. It has also proved 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. Instead of a polyester fleece but can also be coated with a polymer or separated
• the self-supporting ladder composite is produced in this example by the action of heat.
• Heat treatment is carried out at about 125 ° C over a period of 24 hours.
• the epoxy resin penetrates thereby in a low-viscosity state between the individual strands 3 of a wiring harness 2. After curing of the adhesive, the adhesive bond produces the desired
• the layers 4, 5 are formed by a paper wrapper 9 soaked in epoxy resin.
• the individual strands 2 are each stranded.
• position 6 is the stranding of the
• the transformer has a soft magnetic core 15 with a plurality of legs. Each of the legs carries a winding assembly 11. Of the
• the connecting lines 10 extend in Figure 3 over long distances horizontally. The largely straightforward
• connection lines 10 also lead to
• connecting lines 10 have hitherto been designed as insulated copper bars or copper bars.
• these connecting lines 10 are designed as a self-supporting electrical cable ("seif supporting lead cable”), that is, the interconnection is now carried out by means of self-supporting copper cables.
• the production of bends 12 can be carried out manually during assembly, since the connecting lines 10 are sufficiently flexible, especially since the adhesive has not yet hardened. There are no bending tools required.
• the transformer After mounting the connecting lines 10 and the end of the manufacturing process, the transformer is in a Drying oven heated to a temperature of about 120 ° Celsius.
• the cost savings in the manufacture of the transformer thus results on the one hand, that no complex bending devices for bending of massive copper cables are required.
• the interconnection with the flexible connecting lines 10 requires a comparatively small manual effort.
• the invention is applicable to the construction of power transformers.
• Supports 14 extend the connecting lines 10 self-supporting.
• the heat treatment of the transformer gives the
• FIG. 4 shows a further embodiment of the invention
• the individual wires are round wires, which in turn by
• the conductor As a material copper is used for the conductor here, of course, the individual wires but also made of aluminum or another electrically conductive
• the individual conductors of the copper cable are bare, that is, not electrically isolated from each other.
• the invention is also understandable
• the heat to cure the polymer material can pass through an oven, but also partially on the connecting line
• suitable carriers for the adhesive are various absorbent materials,
• fleece For example, fleece, knitted fabric and tissue.
• the coating of the individual wires with adhesive can be done by a spray or a dipping process.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Coils Of Transformers For General Uses (AREA)
• Insulating Of Coils (AREA)

Priority Applications (5)

Applications Claiming Priority (1)

Publications (1)

Family

ID=46025681

Family Applications (1)

Country Status (5)

Cited By (2)

Citations (6)

Family Cites Families (5)

• 2012
  • 2012-04-24 CN CN201280072648.9A patent/CN104246926B/zh active Active
  • 2012-04-24 IN IN8102DEN2014 patent/IN2014DN08102A/en unknown
  • 2012-04-24 KR KR1020147032923A patent/KR20150005651A/ko not_active Ceased
  • 2012-04-24 EP EP12718172.5A patent/EP2842141B1/de active Active
  • 2012-04-24 WO PCT/EP2012/057487 patent/WO2013159813A1/de active Application Filing

Patent Citations (6)

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