DE102017208814A1 - Spacer tape, transformer winding and transformer and the method for producing a spacer strip - Google Patents

Abstract

The invention relates to a spacer strip (1) for a transformer having a band-shaped carrier (10) extending along a longitudinal axis (L) and a plurality of mounting locations (2) arranged at mounting locations (2) along the longitudinal axis (L) in each case a spacer elements (20, 30, 40, 50, 60, 70) is arranged. In order to provide a spacer strip which avoids the disadvantages of the spacer strips known from the prior art, it is provided that the spacer elements (20, 30, 40, 50, 60, 70) are fastened to the carrier (10) in a force-locking and / or form-fitting manner ,

Description

The present invention relates to a spacer tape, a transformer winding and a transformer, and a method for producing a spacer tape.

Transformers generally have an iron core around which several electrical conductors are wound. The conductor windings form coils, by means of which an input AC voltage is transformed into an AC output voltage. The conductors can be wound in different ways. For example, a simple coil can be made from a single piece of wire by helically winding the wire about a central axis or around a core. In another winding method, a conductor has multiple conductor windings. Each conductor winding is spirally wound in a plane perpendicular to a central axis. The two ends of the conductor winding are connected to similar conductor windings in overlying and underlying planes along the core axis, forming a continuous conductor. This type of winding is also known as disc winding.

Generic spacer strips are used in the construction of large transformers or power transformers as spacers between two radially adjacent conductor windings or two turns of the same conductor winding. In this case, there should be a radial distance between the adjacent conductor windings or windings with respect to the diameter of the coil, by which the conductor windings are electrically isolated from each other and serve both as a cooling channel.

When used as intended, air and / or water should be prevented from entering the transformer to prevent short circuits of the transformer. For this reason, transformers using corresponding spacer strips are completely under oil during operation. The oil also serves as an insulator and reduces the risk of short circuits.

In addition to the radial distance axial cooling channels are to be formed by means of the spacer strips, through which the oil can circulate. The oil absorbs heat in the areas between the conductor windings and dissipates them.

Generic spacers consist essentially of a band-shaped carrier, are arranged on the spacer elements, and are inserted together with the winding wire in the production process of the winding with. The spacer elements are spaced apart from one another along the carrier, whereby cooling ducts are formed between the spacer elements when used as intended in the transformer. Corresponding spacer bands are for example from the DE 1,938,987 or the DE 28 13 011 C2 known. The spacer strips are usually made of pressboard, which is why they are impregnated by the oil. Soaking is desirable because it avoids trapped air.

In practice, glued or glued spacer strips are often used. The DE 1,938,987 For making a spacer tape, proposes to roll up a glue-pretreated strip of insulating material and fasten it to a base strip. In the distance band of DE 28 13 011 C2 In contrast, cuboidal or prismatic flow control elements are glued to a tape. However, the use of glue or adhesive to attach spacers to the belt-shaped carrier can result in trapped air, which in turn can cause partial discharges in the windings. Since these partial discharges can lead in the long term to a transformer to a total failure, it would therefore be desirable to be able to do without this type of connection.

Alternatively, the flow control elements and the band can also be made in one piece. The DE 28 13 011 C2 proposes a corresponding spacer tape.

Although the use of adhesive or glue can be avoided by the one-piece production of carrier and spacer elements, such spacer strips are usually made of plastics. Although plastics are electrically insulating, they can not be soaked in oil. In addition, the use of plastics from an environmental point of view is disadvantageous. In addition, spacer strips with plastic elements can not be used in oil-cooled transformers, since small air bubbles form on the boundary layer between plastic and oil, which lead to partial discharges. Apart from that, spacer strips with plastic elements are considerably more costly than spacer strips made from pressed chip.

An alternative to the one-piece, plastic-based spacer bands is that from the EP 0 040 382 A1 known distance band. There, a pressboard is provided on the top and bottom with grooves, creating a one-piece spacer strip with spacers, which are interconnected by webs, arises. However, this form of production is very complicated, especially when a high dimensional accuracy of the spacer elements is required. In addition, the spacer strip produced in this way does not have sufficient Flexibility for co-winding with the ladders.

It is therefore the object of the invention to provide a spacer strip which avoids the disadvantages of the spacer strips known from the prior art.

This object is achieved by a spacer strip according to claim 1, a transformer winding according to claim 20, a transformer according to claim 21 and a method according to claim 22.

The spacer strip according to the invention for a transformer has a length along a longitudinal axis L extending, band-shaped carrier and several along the longitudinal axis L spaced apart at mounting locations arranged spacer elements. The spacer strip is characterized in that the spacer elements are non-positively and / or positively secured to the carrier.

By a non-positive and / or positive connection of the carrier and spacer element, the use of adhesive is avoided, which is disadvantageous for the reasons mentioned above. In addition, non-positive and positive connections are easy to automate, whereby the production of the spacer strips can be simplified.

For the purposes of the present invention, positive engagement also preferably includes connections in which the connection partners can move relative to one another, as is the case, for example, in the case of a conventional round link chain.

It is therefore preferably provided that there is no material connection between the carrier and the spacer elements. In this way, the risk of pores in cohesive compounds can be completely bypassed.

Advantageously, the carrier and / or the spacer elements made of wood pulp and / or wood pulp, in particular from pressboard. Pressspan can be soaked in oil, whereby any pores in the carrier or the spacer elements are filled with oil by omitting adhesive. In this way the risk of partial discharges in the transformer is reduced. In addition, pulp and wood pulp are ecologically beneficial compared to plastics.

The carrier preferably has a carrier thickness TD with 0.1 mm ≦ TD ≦ 1 mm, in particular 0.2 mm ≦ TD ≦ 0.3 mm. A suitably designed carrier is sufficiently stable but does not wear too much.

In advantageous developments it is provided that at least one of the spacer elements has at least one groove in which the carrier is arranged. A groove can be produced in a simple manner and also automatically. In addition, a secure connection with the carrier can be realized by a groove in the spacer elements. Preferably, the groove is a clamping groove, a flat groove, a guide groove or a retaining groove.

It is preferably provided that at least one of the spacer elements is perpendicular to the longitudinal axis L extending clamping groove, in which a bead of the carrier is arranged. A bead is advantageous in that the carrier only needs to be deformed and not machined with parting or joining techniques. In particular, separation processes can have a negative influence on the structural stability of the support. These are avoided by forming a bead.

Advantageously, the carrier is divided into at least one of the mounting locations in at least three partial webs, wherein at least one partial web extend on an upper side of the spacer element and at least two partial webs on an underside of the spacer element opposite the upper side. In this way, the spacer elements are received and held between the partial webs. Particularly preferably, an odd number of partial webs is provided in total.

During production and subsequent further processing, the spacer tape is at any time along the longitudinal axis L loaded on train. As a result, the spacer elements are held by means of adhesion of the partial webs of the carrier. In addition, the material of the carrier is relatively stiff, especially when manufactured from pressboard and a carrier thickness ≥ 0.25 mm. The stiffness of the carrier causes a restoring force, since the carrier has a tendency to return to its flat original shape. The restoring force additionally causes a frictional connection, by which the spacer elements are held.

The partial webs preferably run parallel to the longitudinal axis. The subdivision of the carrier in partial webs can be done for example by means of longitudinal slots. Longitudinal slots can be produced in a simple manner.

To improve the connection between the carrier and spacer elements is provided in advantageous developments that at least one of the spacer elements at the top and / or the bottom at least one flat groove and / or has at least one paragraph for a partial web. The carrier and in particular partial webs of the carrier can be arranged in the flat groove and on the heels. In this way it is prevented that the spacer elements in a direction perpendicular to the longitudinal axis L slip from the carrier.

In advantageous developments it is provided that the carrier at at least one of the mounting locations along the longitudinal axis L has extending plug opening. A plug-in opening allows the insertion of a spacer element, whereby a secure connection of carrier and spacer element can be made. In a direction perpendicular to the longitudinal axis, edge strips of the carrier, which delimit the plug-in opening, are preferably provided in addition to the plug-in opening.

Preferably, at least one of the spacer elements has at least one lateral, parallel to the longitudinal axis L extending guide groove on. The edge tracks of the carrier are advantageously arranged in each case in a guide groove, whereby a positive connection is made. Preferably, a guide groove is provided on two opposite sides of the spacer element, so that the spacer element is held between the two edge webs.

In advantageous developments it is provided that the carrier at at least one of the mounting locations along the longitudinal axis L having extending constriction. A constriction weakens the wearer less than through an insertion opening. At least one of the spacer elements preferably has a central, along the longitudinal axis L extending holding groove on. The carrier can be arranged with the constriction in the retaining groove, whereby a positive connection is made possible.

Particularly preferably, the retaining groove of the spacer element for the carrier has a passage region with a width K1 and an end portion of a width K2 where K2> K1. For mounting a spacer element on the carrier, the carrier can be pushed through the passage area and then reach the end region. The smaller width of the passage area prevents the carrier can fall out of the retaining groove again. Particularly preferably, the carrier has a width in the region of the constriction B4 on, where B4> K1. Advantageously, B4 ≥ K2, so that the carrier is under tension in the end region. In this case, the carrier is preferably deformed.

In advantageous developments, it is provided that the constriction along the longitudinal axis L one behind the other an insertion area with a width B2 , a retention area with a maximum width B1 and a holding area with a width B3 where B1> B2 and B1> B3. The insertion area can be inserted into a retaining groove of a spacer element. Subsequently, the spacer element along the longitudinal axis L are moved in the direction of the holding area, wherein it first passes the retention area. By further movement along the longitudinal axis L enters the spacer into the holding area in which it is held. The retention area prevents the spacer element from being moved back in the direction of the insertion area.

Advantageously, the width of the retention area increases along the longitudinal axis L starting from the insertion area in the direction of the holding area to continuously. As a result, the carrier in the retention area is automatically deformed when moving a spacer element from the insertion area into the retaining area, whereby the path for pushing for the spacer element is automatically released. If the spacer has arrived in the holding area, a return in the opposite direction is prevented by the retention area.

Preferably, B1> K2. Thereby, the spacer is held in the holding area and a movement in the direction of the insertion is prevented. More preferably, K2> B2. This allows a simple, resistance-free insertion of the carrier in the retaining groove. More preferably, K2 ≥ B3. As a result, the holding region of the carrier can lie in the holding groove without deformation. The length of the holding area, measured in the direction of the longitudinal axis L , preferably corresponds to the spacer element length DL , Likewise, the length of the insertion region preferably corresponds to the spacer element length DL ,

Advantageously, the constriction has a length along the longitudinal axis L extending spring opening. The spring opening preferably extends along the holding and retaining regions. At at least one longitudinal end, the spring opening may have an additional spring slot. The spring opening allows easier deformation of the carrier perpendicular to the longitudinal axis. In this way, the assembly of the spacer elements on the carrier is facilitated.

In advantageous developments, it is provided that the carrier has a width TB and the spacer elements have a width DB where TB = DB. In this way, the spacer strip is given a uniform width, whereby the processing and assembly is simplified.

Advantageously, the spacer elements are all identical. As a result, the spacers can be produced more cheaply.

The transformer winding according to the invention has at least one core and arranged around a core axis K of the core conductor windings, wherein between two radially adjacent arranged conductor windings, a spacer strip according to the above embodiments is arranged.

The transformer according to the invention comprises at least one spacer strip according to the above embodiments and / or a transformer winding according to the above statements.

• - Bereitstellen eines bandförmigen Trägers mit einer Längsachse L;
• - Bereitstellen mehrerer Distanzelemente;
• - Anordnen der Distanzelemente an Montageorten des Trägers und entlang der Längsachse L zueinander beabstandet, wobei die Distanzelemente kraftschlüssig und/oder formschlüssig mit dem Träger verbunden werden.

The inventive method for producing a spacer strip according to the above embodiments comprises the following steps:

• - Providing a band-shaped carrier with a longitudinal axis L ;
• - Providing multiple spacers;
• - Arranging the spacer elements at mounting locations of the carrier and along the longitudinal axis L spaced from each other, wherein the spacer elements are non-positively and / or positively connected to the carrier.

The method according to the invention provides a spacer strip in which the spacer elements are non-positively and / or positively connected to the carrier. In this way, a cohesive connection of spacers and support can be avoided. This reduces the risk of partial discharges in a transformer in which the spacer strips produced in this way are used.

The method according to the invention can have one or more of the assembly steps described above with respect to the spacer strip. The carrier and / or the spacer elements may be formed in the method according to the invention according to one or more of the advantageous developments described above.

• 1a einen Transformator in einer schematischen Darstellung;
• 1b den Schnitt A-A der 1a;
• 2a eine Transformatorenwicklung in einer Seitenansicht;
• 2b die Transformatorenwicklung der 2a in einer Draufsicht;
• 2c die Transformatorenwicklung der 2b im Schnitt A-A;
• 3a eine erste Ausführungsform eines Distanzbandes in einer Seitenansicht;
• 3b die Ausführungsform der 3a in einer Draufsicht;
• 3c die Ausführungsform der 3a im Schnitt B-B;
• 3d die Ausführungsform der 3a in einer Unteransicht;
• 3e eine vergrößerte Darstellung des Details C der Ausführungsform der 3a;
• 3f ein einzelnes Distanzelement der Ausführungsform der 3a in einer perspektivischen Ansicht;
• 4a eine zweite Ausführungsform eines Distanzbandes in einer Seitenansicht;
• 4b die Ausführungsform der 4a in einer Draufsicht;
• 4c die Ausführungsform der 4a im Schnitt B-B;
• 4d die Ausführungsform der 4a in einer Unteransicht;
• 4e die Ausführungsform der 4a in einer Vorderansicht;
• 4f ein einzelnes Distanzelement der Ausführungsform der 4a in einer perspektivischen Ansicht;
• 5a eine dritte Ausführungsform eines Distanzbandes in einer Seitenansicht;
• 5b die Ausführungsform der 5a in einer Draufsicht;
• 5c die Ausführungsform der 5a im Schnitt B-B;
• 5d die Ausführungsform der 5a in einer Unteransicht;
• 5e den Schnitt D-D durch die in der 5b gezeigte Ausführungsform in vergrößerter Darstellung;
• 5f ein einzelnes Distanzelement für die Ausführungsform der 5a in einer perspektivischen Ansicht;
• 6a eine vierte Ausführungsform eines Distanzbandes in einer Seitenansicht;
• 6b die Ausführungsform der 6a in einer Draufsicht;
• 6c die Ausführungsform der 6a im Schnitt B-B;
• 6d die Ausführungsform der 6a in einer Unteransicht;
• 6e die Ausführungsform der 6a in einer Vorderansicht;
• 6f ein einzelnes Distanzelement der Ausführungsform der 6a in einer perspektivischen Ansicht;
• 7a eine fünfte Ausführungsform eines Distanzbandes in einer Seitenansicht;
• 7b die Ausführungsform der 7a in einer Draufsicht;
• 7c die Ausführungsform der 7a im Schnitt B-B;
• 7d die Ausführungsform der 7a in einer Unteransicht;
• 7e die Ausführungsform der 7a in einer Vorderansicht; und
• 7f ein einzelnes Distanzelement für die Ausführungsform der 7a in einer perspektivischen Ansicht.

The invention will be illustrated and explained by way of example with reference to FIGS. It shows:

• 1a a transformer in a schematic representation;
• 1b the cut AA of the 1a ;
• 2a a transformer winding in a side view;
• 2 B the transformer winding of the 2a in a plan view;
• 2c the transformer winding of the 2 B on average AA ;
• 3a a first embodiment of a spacer strip in a side view;
• 3b the embodiment of the 3a in a plan view;
• 3c the embodiment of the 3a in section BB;
• 3d the embodiment of the 3a in a bottom view;
• 3e an enlarged view of the detail C of the embodiment of the 3a ;
• 3f a single spacer element of the embodiment of the 3a in a perspective view;
• 4a a second embodiment of a spacer strip in a side view;
• 4b the embodiment of the 4a in a plan view;
• 4c the embodiment of the 4a in section BB;
• 4d the embodiment of the 4a in a bottom view;
• 4e the embodiment of the 4a in a front view;
• 4f a single spacer element of the embodiment of the 4a in a perspective view;
• 5a a third embodiment of a spacer strip in a side view;
• 5b the embodiment of the 5a in a plan view;
• 5c the embodiment of the 5a on average BB ;
• 5d the embodiment of the 5a in a bottom view;
• 5e the cut DD through in the 5b embodiment shown in an enlarged view;
• 5f a single spacer for the embodiment of 5a in a perspective view;
• 6a a fourth embodiment of a spacer strip in a side view;
• 6b the embodiment of the 6a in a plan view;
• 6c the embodiment of the 6a on average BB ;
• 6d the embodiment of the 6a in a bottom view;
• 6e the embodiment of the 6a in a front view;
• 6f a single spacer element of the embodiment of the 6a in a perspective view;
• 7a a fifth embodiment of a spacer strip in a side view;
• 7b the embodiment of the 7a in a plan view;
• 7c the embodiment of the 7a on average BB ;
• 7d the embodiment of the 7a in a bottom view;
• 7e the embodiment of the 7a in a front view; and
• 7f a single spacer for the embodiment of 7a in a perspective view.

The 1a and 1 b show a transformer 200 with a core 201 , The core 201 consists of a U-shaped part 202 and a yoke closing the magnetic circuit 203 , On the core 201 are two transformer windings 100 arranged, each having a plurality of conductor windings 102 exhibit. For illustration purposes, the transformer windings 100 identical, in practice, the input and the output transformer winding of a transformer are usually different in particular in terms of their number of turns to allow transformation of an input voltage in an output voltage. The structure of the transformer winding 100 will be described in detail with reference to 2a to 2c explained in more detail.

The 2a to 2c show a transformer winding 100 in simplified form with several conductor windings 102 , The transformer winding 100 has a winding axis W on. The conductor windings 102 are each spirally around the winding axis W arranged. The conductor windings 102 are wound by disc-winding type. Every conductor winding 102 is spiral and in a plane perpendicular to the axis of the winding W arranged. Every conductor winding 102 with the exception of the top and bottom is with the overlying and the underlying conductor winding 102 through fasteners 103 connected such that between a first coil end 107 and a second coil end 108 a continuous ladder is created.

In the radial direction, that is perpendicular to the winding axis W , are the conductor windings 102 through distance bands 1 separated from each other. In other embodiments, the conductor windings 102 be separated in the vertical direction by separating elements.

The conductor windings 102 have a core and a sheath on. The sheath is preferably made of paper.

The distance bands 1 have a band-shaped carrier 10 and spacers 20 on. Between the conductor windings 102 and limited by the spacer elements 20 become channels 104 educated. The channels 104 are flowed through by a cooling medium, in particular oil. During operation, the cooling medium flows through the channels 104 and in this way dissipates heat from the transformer 100 from.

The 3a to 3e show a first embodiment of a spacer strip according to the invention 1 , The spacer band 1 has a band-shaped carrier 10 with a longitudinal axis L and three along the longitudinal axis L at assembly sites 2 spaced-apart spacer elements 30 , In the lowest mounting location 2 is the spacer element 30 not shown. In 3f is a single spacer 30 shown. The longitudinal axis L of the carrier 10 is also the longitudinal axis L of the spacer band 1 ,

The carrier 10 points perpendicular to the longitudinal axis L a width TB on. The spacer elements 30 also perpendicular to the longitudinal axis L a width DB on, where TB = DB applies. The carrier 10 points along the longitudinal axis L a carrier length TL and perpendicular to the longitudinal axis L as well as perpendicular to the width TB a carrier thickness TD on. The beam width TB is much larger than the carrier thickness TD , preferably at least 5x. The carrier length TL is much larger than the beam width TB , preferably at least 10x. This shows the wearer 10 a band-shaped basic shape.

The spacer elements 30 ( 3f ) are cuboid and each have an upper side 21 and one of the top 21 opposite bottom 22 , two opposite side surfaces 23 . 24 and two opposite end faces 25 . 26 on. The carrier 10 and the spacer elements 30 consist of pressboard. The spacer elements 30 are all identical. The spacer elements 30 are each at a distance A ( 3b ) are arranged to each other.

Each spacer element 30 has a clamping groove 31 on. The clamping groove 31 is on the bottom 22 arranged and runs from the first side surface 23 to the second side surface 24 , In cross-section is the clamping groove 31 pentagonal. The spacer elements 30 are so on the carrier 10 arranged that the clamping groove 31 perpendicular to the longitudinal axis L of the carrier 10 runs. At every installation site 2 is the carrier 10 to a bead 32 summarized. Every bead 32 is in a clamping groove 31 arranged and clamped there ( 3e ). That way are spacers 30 and carriers 10 positively and non-positively connected.

The production of the spacer tape 1 For example, can be done so that first a carrier 10 is provided and at each installation site 2 a bead 32 is formed. Subsequently, spacer elements 30 perpendicular to the longitudinal axis L on the beads 32 pushed, with the beads 32 in the clamping grooves 31 be introduced.

The spacer strip produced in this way 1 can then be in a transformer 100 ( 2a ) be used.

The 4a to 4e show a second embodiment of a spacer band 1 , The spacer band 1 also has a band-shaped carrier 10 with a longitudinal axis L and along the longitudinal axis L spaced from each other at mounting locations 2 arranged spacer elements 40 , Again, the carrier width corresponds TB the distance element width DB ,

That in the 4e and 4f shown spacer element 40 is cuboid and has an upper side 21 and one of the top 21 opposite bottom 22 , two opposite side surfaces 23 . 24 and two opposite end faces 25 . 26 on. On the top 21 has the spacer element 40 a flat groove 42 on. The flat groove 42 has a rectangular cross section and extends from the first end face 25 to the second end face 26 , The bottom 22 of the spacer element 40 is just.

At every installation site 2 of the carrier 10 is a spacer element 40 arranged ( 4b ), the lowest of the spacer elements 40 not shown. At the assembly sites 2 is the carrier 10 by means of longitudinal slots 44 in three sub-webs, that is in a middle sub-web 41a and two lateral partial webs 41b , divided up. The three sub-tracks 41a . 41b run parallel to the longitudinal axis L , The spacer elements 40 be from the subways 41a . 41b held, with the middle sub-web 41a in the flat groove 42 on the top 21 and the two side partial webs 41b on the bottom 22 run. In this way, the carrier 10 and the spacer elements 40 positively connected with each other.

In the 5a to 5e is another embodiment of a spacer strip according to the invention 1 shown. The spacer band 1 has a band-shaped carrier 10 with several at mounting locations 2 along the longitudinal axis L spaced spacer elements arranged 50 ,

This in 5f shown spacer element 50 is cuboid and has an upper side 21 and an opposite bottom 22 , two opposite side surfaces 23 . 24 and two opposite end faces 25 . 26 on. In the side areas 23 . 24 has the spacer element 50 one guide groove each 52 on. The guide grooves 52 each extend from the first end face 25 up to the second end face 26 and each have a rectangular cross section.

The carrier 10 indicates at each installation site 2 a plug-in opening 51 on ( 5d ). The plug-in openings 51 each have the shape of a slot, wherein in the end regions along the longitudinal axis L one spring slot each 53 is provided. Each plug-in opening 51 forms with its associated spring slots 53 a common opening. On the side next to the plug-in openings 51 that is, in a direction transverse to the longitudinal axis L are edge tracks 54 of the carrier 10 intended. The edge tracks 54 be in the guide grooves 52 the spacer elements 50 arranged so that carrier 10 and spacers 50 are positively connected with each other.

Through the spring slots 53 can the edge tracks 54 during assembly of the spacer elements 10 perpendicular to the longitudinal axis L be moved away from each other. Subsequently, a spacer element 50 between the edge tracks 54 arranged and the edge tracks 54 be in the guide grooves 52 pushed.

In the 6a to 6e is another embodiment of a spacer strip according to the invention 1 shown. The 6f shows a single spacer 60 for this embodiment.

The spacer band 1 is also band-shaped and has several mounting locations 2 on, at which spacers 60 are arranged ( 6b ). The lowest spacer element 60 is not shown. The carrier 10 has a beam width TB on, the width DB the spacer elements 60 equivalent.

At every installation site 2 instructs the wearer 10 a constriction 61 on. In the area of constriction is the width of the beam 10 less than the beam width TB , The carrier thickness TD is unchanged. At the narrowest point has the constriction 61 a width B4 on. The width B4 becomes perpendicular to the longitudinal axis L measured. To avoid tearing, the constriction indicates 61 no corner on its contour ( 6d ).

The spacer element 60 is cuboid and has an upper side 21 and an opposite bottom 22 , two opposite side surfaces 23 . 24 and two opposite end faces 25 . 26 on ( 6e . 6f ). On the bottom 22 has the spacer element 60 a retaining groove 62 on. The holding groove 62 runs from the first end 25 to the second end face 26 , In cross-section is the retaining groove 62 pentagonal.

The holding groove 62 has a passage area 63 with a width K1 and an end area 64 with a width K2 on. The latitudes K1 . K2 are each along a vertical connecting line between the side surfaces 23 . 24 measured. The width K2 is greater than the width K1 ,

When installing the spacer elements 60 on the carrier 10 becomes the carrier 10 in the area of constriction 61 through the passageway area 63 pressed until the carrier 10 in the end area 64 arrives. The carrier 10 will be in the area of constriction 61 during insertion into the retaining groove 62 deformed, as the width B4 the constriction 61 is greater than the width K1 , The width B4 is larger than K2, so that a low bias is created and the carrier 10 due to the narrower passage area 63 from being prevented from holding 62 to slip out. Due to the deformation of the carrier 10 a bead forms 65 ,

In the 7a to 7e is another embodiment of a spacer strip according to the invention 1 shown. The spacer band 1 also has a band-shaped carrier 10 with mounting locations 2 on. At every installation site 2 is a spacer element 70 arranged, wherein the lowest spacer element 70 not shown.

The carrier 10 indicates at each installation site 2 a constriction 71 on ( 7d ). In the area of constriction 71 instructs the wearer 10 different widths, which are all smaller than the beam width TB , The constriction 71 is along the longitudinal axis L divided into three immediate successive areas: an insertion area 75 which is in a wedge-shaped retention area 76 passes and a subsequent holding area 77 , The insertion area 75 has a width B2 , the wedge-shaped retention area 76 has a width at its widest point B1 and the holding area 77 has a width B3 on. The latitudes B1 . B2 . B3 are each parallel to the beam width TB measured.

In the retention area 76 and the holding area 77 every constriction 71 is in each case a common spring opening 78 arranged. The spring opening 78 has the shape of a slot, at one end into the insertion area 75 extending spring slot 79 is provided. The spring opening 78 allows together with the spring slot 79 a deformation of the carrier 10 in the retention area 76 , thereby temporarily reducing the width B1 of the carrier 10 in the retention area 76 can be reduced.

A spacer element 70 for this embodiment of the spacer band 1 is in 7f shown. The spacer element 70 is cuboid and has an upper side 21 and an opposite bottom 22 , two opposite side surfaces 23 . 24 and two opposite end faces 25 . 26 on.

The spacer element 70 points to the bottom 22 a holding groove 72 on. The holding groove 72 is T-shaped in cross-section and has a passage area 73 as well as a wider end area 74 for the wearer 10 on. The passageway area 73 has a width K1 and the end area 74 has a width K2 on. The holding groove 72 extends from the first end face 25 to the second end face 26 and thus along the entire distance element length DL ,

During assembly, the insertion area becomes 75 of the carrier 10 deformed and through the passage area 73 in the end area 74 of the spacer element 70 pushed. The width B2 of the insertion area 75 is greater than the width K1 but smaller than the width K2 so the carrier 10 is prevented from reaching the end area 74 to leave.

Subsequently, the spacer element 70 along the longitudinal axis L in the direction of the holding area 77 emotional. As a result, it first enters the wedge-shaped retention area 76 , Because the width B1 of the retention area 76 is greater than the width K2 , becomes the carrier 10 deformed, resulting in the spring opening 78 with the spring slot 79 is possible.

By further shifting along the longitudinal axis L enters the spacer 70 in the holding area 77 , causing the retention area 76 can return to its original form. The width B3 of the holding area 77 is smaller than the width K2 of the end region 74 but bigger than the width K1 of the passage area 73 the holding groove 72 of the spacer element 70 , In this way, the spacer element 70 positive fit with the carrier 10 connected. Through the retention area 76 becomes a movement of the spacer element 70 in the direction of the insertion area 75 prevented.

The carriers 10 as well as the spacer elements 20 . 30 . 40 . 50 . 60 . 70 The embodiments shown are made of pressboard.

The spacer bands according to the invention 1 You can also have more than three installation locations 2 exhibit.

LIST OF REFERENCE NUMBERS

1

packing tape

2

mounting

10

carrier

20

spacer

21

top

22

bottom

23

first side surface

24

second side surface

25

first end face

26

second end face

30

spacer

31

clamping groove

32

bead

40

spacer

41a

middle part track

41b

lateral partial path

42

flat groove

44

longitudinal slot

50

spacer

51

plug-in opening

52

guide

53

spring slot

54

edge rail

60

spacer

61

constriction

62

retaining groove

63

Passage area

64

end

65

bead

70

spacer

71

constriction

72

retaining groove

73

Passage area

74

end

75

insertion

76

Retention area

77

holding area

78

spring opening

79

spring slot

100

transformer winding

102

conductor winding

103

connecting member

104

channel

107

first winding end

108

second winding end

200

transformer

201

core

202

U-shaped part

203

yoke

A

distance

B1

Width of the retention area 76

B2

Width of the insertion area 75

B3

Width of the holding area 77

B4

Width of the constriction 61

DB

Spacer width

DL

Spacer length

K1

Width of the passage area 63, 73

K2

Width of the end region 64, 74

L

longitudinal axis

TB

carriage width

TD

carrier thickness

TL

beam length

W

winding axis

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• DE 1938987 [0006, 0007]
• DE 2813011 C2 [0006, 0007, 0008]
• EP 0040382 A1 [0010]

Claims (22)

Spacer strip (1) for a transformer having a band-shaped carrier (10) extending along a longitudinal axis (L) and a plurality of spacer elements (20, 30, 40, 50, 60) arranged at mounting locations (2) spaced apart along the longitudinal axis (L) , 70), characterized in that the spacer elements (20, 30, 40, 50, 60, 70) are non-positively and / or positively secured to the carrier (10). Distance tape (1) according to Claim 1 , characterized in that between the carrier (10) and the spacer elements (20, 30, 40, 50, 60, 70) there is no adhesion. Distance tape (1) according to Claim 1 or 2 , characterized in that the carrier (10) and / or the spacer elements (20, 30, 40, 50, 60, 70) made of pulp and / or wood pulp, in particular from pressboard, exist. Spacer belt (1) according to one of the preceding claims, characterized in that at least one of the spacer elements (20, 30, 40, 50, 60, 70) has at least one groove (31, 42, 52, 62, 72) in which the Carrier (10) is arranged. Spacer belt (1) according to one of the preceding claims, characterized in that at least one of the spacer elements (30) has a perpendicular to the longitudinal axis (L) extending clamping groove (31) in which a bead (32) of the carrier (10) is arranged , Spacer strip (1) according to one of the preceding claims, characterized in that the carrier (10) is divided at least at one of the mounting locations (2) into at least three partial tracks (41a, 41b), wherein at least one partial track (41a) is disposed on an upper side (41a). 21) of the spacer element (40) and at least two partial webs (41b) extend on an underside (22) of the spacer element (40) opposite the upper side (21). Distance tape (1) according to Claim 6 , characterized in that the partial webs (41a, 41b) parallel to the longitudinal axis (L). Distance tape (1) according to Claim 6 or 7 Characterized in that at least one of the spacer elements (40) at the top (21) and / or the bottom (22) at least one flat groove (42) and / or at least a shoulder for a partial web (41a, 41b). Distance tape (1) according to one of the preceding claims, characterized in that the carrier (10) has at least one of the mounting locations (2) along the longitudinal axis (L) extending plug opening (51). Distance tape (1) according to Claim 9 , characterized in that at least one of the spacer elements (50) has at least one lateral, parallel to the longitudinal axis (L) extending guide groove (52). Spacer belt (1) according to one of the preceding claims, characterized in that the carrier (10) has a constriction (61, 71) extending along the longitudinal axis (L) at at least one of the mounting locations (2). Distance tape (1) according to Claim 11 , characterized in that at least one of the spacer elements (60, 70) has a central, along the longitudinal axis (L) extending retaining groove (62, 72). Distance tape (1) according to Claim 12 characterized in that the retaining groove (62, 72) has a passage area (63, 73) for the beam (10) having a width K1 and an end area (64, 74) for the beam (10) having a width K2, K2> K1 is. Distance tape (1) according to Claim 13 , characterized in that the carrier (10) in the region of the constriction (61) has a width B4, wherein B4> K1. Distance band (1) according to one of Claims 11 to 14 , characterized in that the constriction (71) along the longitudinal axis (L) in succession an insertion region (75) having a width B2, a retaining region (76) having a maximum width B1 and a holding region (77) having a width B3, wherein B1> B2 and B1> B3. Distance tape (1) according to Claim 15 , characterized in that B1> K2 and K2> B2 and K2 ≥ B3. Distance band (1) according to one of Claims 11 to 16 , characterized in that the constriction (61, 71) has a spring opening (78) extending along the longitudinal axis (L). Spacer belt (1) according to one of the preceding claims, characterized in that the carrier (10) has a width TB and the spacer elements (20, 30, 40, 50, 60, 70) have a width DB, where TB = DB. Spacer belt (1) according to one of the preceding claims, characterized in that the spacer elements (20, 30, 40, 50, 60, 70) are all formed identically. Transformer winding (100) having at least one core (101) and arranged around a core axis (K) of the core (101) conductor windings (102), wherein between two radially adjacent arranged conductor windings (102) a spacer strip (1) arranged according to one of the preceding claims is. Transformer (200) with at least one spacer strip (1) according to one of Claims 1 to 19 and / or with a transformer winding (100) according to Claim 20 , Method for producing a spacer strip (1) according to one of the Claims 1 to 19 with the following steps: - providing a band-shaped carrier (10) with a longitudinal axis (L); - Providing a plurality of spacer elements (20, 30, 40, 50, 60, 70); - Arranging the spacer elements (20, 30, 40, 50, 60, 70) at mounting locations (2) of the carrier (10) and along the longitudinal axis (L) spaced from each other, wherein the spacer elements (20, 30, 40, 50, 60 , 70) are positively and / or positively connected to the carrier (10).

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