EP2564401B1 - Transformer - Google Patents

Description

The invention relates to a transformer having the features according to the preamble of patent claim 1.

Such a transformer is sold by Siemens AG under the product name GEAFOL and is described in detail in the product brochure with the order number E50001-G640-A144. This prior art transformer has a transformer core made of transformer core, three high voltage coils and three low voltage coils. The transformer core comprises three core legs, each of which passes through a low voltage coil and a high voltage coil. The undervoltage coil is arranged within the associated high-voltage coil and oriented concentrically to this. The undervoltage coils and the high voltage coils are supported by blocks supported by carrier profiles.

The JP 58 157116 A shows a transformer in which an isolation cylinder is attached by means of fasteners on the core. Upper and lower voltage coils are attached to the insulating cylinder with an adhesive.

In the JP 58 070512 A discloses a transformer in which upper and lower voltage coil are molded together with a resin to a coil. During casting, metal plates are also cast in, by means of which the coil can be fastened to fastening elements of the core.

The US Pat. No. 6,326,877 B1 shows a transformer, in the upper and lower voltage coil between the upper and lower yoke press bar be trapped. Support blocks serve as spacers.

The US 4,568,903 shows an ignition coil which is arranged around the middle leg of a core with three legs. The ignition coil has a nose attached to its outside and the core on the inside of an outer core leg has a corresponding recess, so that a bolt inserted into the recess pinches the nose and thus holds the ignition coil and core together.

The invention has for its object to provide a transformer in which the undervoltage coil is held independently of the high voltage coil and does not have to be aligned relative to this.

This object is achieved by a transformer with the features of claim 1. Advantageous embodiments of the transformer according to the invention are specified in subclaims.

Thereafter, the invention provides that the undervoltage coil is held by the core leg with at least one fixing bolt, wherein that on a first side surface of the core leg at least one Bolzenhalteausnehmung is present, in which a first bolt end of the fixing bolt is inserted, the lower voltage coil has at least one Einhängausnehmung and the second bolt end of the fixing bolt is inserted into the Einhängausnehmung the low voltage coil and the fixing bolt holds the undervoltage coil.

A significant advantage of the transformer according to the invention is that the undervoltage coil according to the invention is held directly by the core leg. This makes it unnecessary to hold the undervoltage coil by means of blocks on support profiles or the like. Also eliminates the adjustment of the lower voltage coil relative to the high voltage coil.

Preferably, the fixing bolt extends perpendicularly, at least approximately perpendicular, to the longitudinal axis of the undervoltage coil and perpendicularly, at least approximately perpendicularly, to the longitudinal axis of the core limb.

It is also considered advantageous if the core limb has at least two tie-rod sheets and at least one core bolt passed through the core lamination stack of the core limb, wherein a first tie-sheet lamination at a first side surface of the core lamination stack and a second tie lamination sheet at the opposite second side surface of the core lamination at least a core bolt are connected to each other and compress the transformer core plates of the core stack, and the at least one bolt holding recess is arranged in the first tie plate.

The at least one Bolzenhalteausnehmung may be formed in the first tie plate, for example, by a through hole.

It is also considered advantageous if the undervoltage coil has an electrical connection plate which forms an electrical coil connection of the undervoltage coil, the electrical connection plate forms at least a section of the inner surface of the undervoltage coil and the at least one insertion recess is arranged in the electrical connection plate. The at least one Einhängausnehmung can be formed for example by a through hole.

Between the undervoltage coil and the first tie plate, at least one spacer element is preferably arranged, which ensures a predetermined minimum distance between the low voltage coil and the first tie plate. The spacer element can be pushed onto the fixing bolt or connected in one piece with this.

For the purpose of aligning the undervoltage coil relative to the core limb, it is considered advantageous if at least one at least partially wedge-shaped wedge element is arranged between the second side surface of the core limb and the undervoltage coil opposite the first side surface of the core limb, pushing the undervoltage coil away from the second side surface of the core limb so that the undervoltage coil draws toward the first side surface.

The invention also relates to a method for manufacturing a transformer in which a low-voltage coil is placed on a core leg of a transformer core, while the core leg is passed through the undervoltage coil. According to the invention it is provided that at least one fixing bolt is inserted or taken in a Bolzenhalteausnehmung of the core leg, the lower voltage coil is placed on the core leg, and first off-center to allow passing the undervoltage coil on the laterally projecting fixing bolt, and - as soon as in the Lower tension coil provided Einhängausnehmung has reached the height of the fixing bolt - the lower voltage coil laterally offset or laterally displaced and is pushed with the Einhängausnehmung on the protruding fixing bolts.

With regard to the advantages of the method according to the invention, reference is made to the above statements regarding the transformer according to the invention, since the advantages of the transformer according to the invention essentially correspond to those of the method according to the invention.

It is regarded as advantageous if an at least partially wedge-shaped wedge element is introduced between the second side of the core limb opposite the first side of the core limb and the low-voltage coil, and the lower-voltage coil from the second side of the core limb pushed away and thus attracted to the first side of the core leg.

Figur 1

zur allgemeinen Erläuterung einen Transformator nach dem Stand der Technik, wobei der Übersicht halber lediglich ein einziger Kernschenkel in einer aufgeschnittenen Darstellung gezeigt ist,

Figur 2

den Aufbau der bei dem Transformator gemäß Figur 1 zum Tragen der Unterspannungsspulen und der Oberspannungsspulen vorgesehenen Klötze im Detail,

Figuren 3 bis 6

ein Ausführungsbeispiel für einen erfindungsgemäßen Transformator, wobei in den Figuren der Übersicht halber nur die Anordnung einer Unterspannungsspule relativ zu dem zugeordneten Kernschenkel des Transformatorkerns dargestellt ist.

The invention will be explained in more detail with reference to embodiments; thereby show by way of example

FIG. 1

for general explanation, a transformer according to the prior art, wherein the sake of clarity, only a single Core leg is shown in a cutaway view,

FIG. 2

the structure of the transformer according to FIG. 1 to carry the undervoltage coils and the high voltage coils provided in detail,

FIGS. 3 to 6

an embodiment of a transformer according to the invention, wherein in the figures for the sake of clarity only the arrangement of a lower voltage coil is shown relative to the associated core leg of the transformer core.

For the sake of clarity, the same reference numerals are always used in the figures for identical or comparable components.

The structure of a transformer according to the prior art is exemplary in the FIGS. 1 and 2 shown in more detail. One recognizes in the FIG. 1 one of the three core legs 10 of the transformer core 20. The core leg 10 is passed through an undervoltage coil 30 and a high-voltage coil 40. It can be seen that the two coils 30 and 40 are aligned concentrically with each other, wherein the lower voltage coil 30 is disposed within the high voltage coil 40.

The FIG. 1 also shows two carrier profiles 50 and 60, on which the low voltage coil 30 and the high voltage coil 40 rest. To adjust the low voltage coil 30 and the high voltage coil 40 blocks are provided, of which in the FIG. 1 three are shown by way of example and designated by the reference numeral 70. The function of the blocks 70 is also to adjust the low voltage coil 30 relative to the high voltage coil 40 and relative to the core leg 10.

The FIG. 2 shows by way of example the configuration of the blocks 70 according to FIG. 1 in cross section. It can be seen a coil portion 30a of the lower voltage coil and a coil portion 40a of the high-voltage coil, which are separated by an adjusting pin 80 of the pad 70 and thus adjusted to each other.

Based on FIGS. 3 to 6 An exemplary embodiment of a transformer according to the invention and an exemplary embodiment of the method according to the invention will now be explained by way of example. The FIGS. 3 to 6 show by way of example the arrangement of an undervoltage coil of the transformer relative to the associated core leg of the transformer core.

In the FIG. 3 If one recognizes the undervoltage coil, which is identified by the reference numeral 100. The core leg, which passes through the undervoltage coil 100 is in the FIG. 3 not visible. It is obscured by the yoke 110 of the transformer core.

In the FIG. 4 is the arrangement of the undervoltage coil 100 relative to the core leg in cross section along the section line II 'according to FIG. 3 shown. It can be seen in FIG. 4 that the core limb 120 has a core lamination stack 130 that consists of a large number in the FIG. 4 vertically extending transformer core plates is formed. The transformer core sheets are in the FIG. 4 not shown explicitly for reasons of clarity, the lamination stack 130 is only indicated as a whole by a hatching.

The transformer core laminations of the core lamination stack 130 are pressed together, for example, by two tie plates and two or more (eg, three) core bolts; Additionally or alternatively, core bandages can be used for compression. In this case, for example, a first Zugankerblech 140 at a first (in the FIG. 4 right) side surface 150 of the core lamination stack 130; a second tie plate 160 is located at the opposite second (in the FIG. 4 left side) 165 of the core lamination stack 130. The two Zugankerbcheche 140 and 160 are interconnected by the three core pins, which in the FIG. 4 are denoted by the reference numerals 170, 171 and 172. The three core bolts 170, 171 and 172 are - at least approximately - aligned perpendicular to the longitudinal direction of the core limb 120.

In the FIG. 4 Moreover, it can be seen that the undervoltage coil 100 is aligned concentrically with the core limb 120 and is fastened to the core limb 120 by means of two fixing bolts 200 and 210. The two fixing bolts 200 and 210 extend perpendicularly, at least approximately vertically, to the longitudinal axis of the undervoltage coil 100 and thus perpendicularly, at least approximately perpendicular, to the longitudinal axis of the core limb 120.

The attachment of the undervoltage coil 100 to the core leg 120 by means of the two fixing bolts 200 and 210 is in the FIGS. 5 and 6 shown in more detail in detail; while showing the FIG. 5 the in the FIG. 4 marked with the reference B Detail and the FIG. 6 the in the FIG. 4 with the reference C more detail marked.

One recognizes in the FIGS. 5 and 6 in that the first tie-sheet 140 and thus the core leg 120 have two pin-holding recesses 220 and 230. The Bolzenhalteausnehmungen 220 and 230 are formed by through holes that pass through the first Zugankerblech 140 completely, so that the first bolt end 240 of the two fixing bolts 200 and 210 can rest directly on the outermost transformer core plate of the core stack on the first side surface. The second bolt end 250 of the two fixing bolts 200 and 210 is suspended in two Einhängausnehmungen 260 and 270 in the lower voltage coil 100.

As reflected in the FIGS. 4 to 6 can be seen, the undervoltage coil 100 is equipped with an electrical connection plate 280, which forms an electrical coil terminal of the undervoltage coil 100. In this electrical connection plate 280, two through-holes are present, which form the Einhängausnehmungen 260 and 270 in the lower voltage coil 100. The electrical connection plate 280 thus illustratively forms the inside 290 of the undervoltage coil 100, which concentrically surrounds the outer surface of the core lamination packet 130.

In order to ensure a concentric adjustment of the undervoltage coil 100 relative to the core lamination stack, a spacer device in the form of two spacer elements 300 and 310 is provided between the first tie-rod lamination 140 and the electrical connection lamination 280. The two spacer elements 300 and 310 may be formed for example by spacer plates or spacers, preferably from a electrically non-conductive material. The spacers 300 and 310 may for example be made of plastic, in particular glass fiber reinforced plastic. The two spacers 300 and 310 cause a minimum distance between the first tie plate 140 and in the FIGS. 5 and 6 right side surface of the core leg 120 and the electrical connection plate 280 of the undervoltage coil 100th

The two fixing bolts 200 and 210 can each be integrally connected to their associated spacer element 300 or 310. Preferably, the fixing bolt 200 and the spacer element 300 form a common component and, correspondingly, the fixing bolt 210 and the spacer element 310 form another common component. In the case of such an embodiment, the fixing bolts and the associated spacer elements preferably consist of the same plastic, in particular of the same glass fiber reinforced plastic. If the fixing bolts and the associated spacer elements are each in one piece, advantageously only one single assembly step is necessary per fixing bolt and spacer element adjustment.

Of course, it is also possible to produce the two spacer elements 300 and 310 and the two fixing bolts 200 and 210 as separate components. In such an embodiment, one would preferably insert the two fixing bolts 200 and 210 in the associated Bolzenhalteausnehmungen 220 and 230 in the core leg 120 and the Zugankerblech 140 of the core leg 120 or beat and then postpone the associated spacers 300 and 310. Subsequently, the undervoltage coil 100 can be plugged with the Einhängausnehmungen 260 and 270 on the second bolt end 250 of the two fixing bolts 200 and 210, whereby the undervoltage coil 100 is fixed on or on the core plate package 130 by hanging.

To avoid that the undervoltage coil 100 can be unintentionally posted by the two fixing bolts 200 and 210, the undervoltage coil 100 is preferably in the direction of the second side surface 165 of the core lamination stack 130 (see FIG. FIG. 4 ) drawn. For this purpose, wedge elements can be used, as in the FIGS. 3 and 4 are denoted by the reference numerals 400 and 410. The function of the wedge elements 400 and 410 is the undervoltage coil 100 after being hooked into the two fixing bolts 200 and 210 (see FIG. FIG. 4 ) to the left or towards the second side surface 165 of the core lamination stack 130, so as to avoid unhooking.

The following is based on the Figures 3-6 an embodiment of an assembly method explained:
First, the fixing bolts 200 and 210 are hammered into the Bolzenhalteausnehmungen 220 and 230 of the core limb 120. If the spacers 300 and 310 are not integrally connected to the fixing bolts 200 and 210, they are subsequently pushed onto the fixing bolts 200 and 210.

Subsequently, the undervoltage coil 100 is placed on the associated core limb 120 and thus in the high-voltage coil of the transformer not shown in the figures. This takes place initially off-center, in order to allow passing of the undervoltage coil 100 on the laterally projecting fixing bolts 200 and 210.

Once the Einhängausnehmungen 260 and 270, which are provided in the inner electrical connection plate 280 of the lower voltage coil 100, have reached the height of the respective fixing bolt 200 and 210, the lower voltage coil 100 is shifted in the drawings to the left or shifted so that the Undervoltage coil 100 is pushed with the Einhängausnehmungen 260 and 270 on the protruding fixing bolts 200 and 210 and thus fixed on the core leg 120. The undervoltage coil 100 is thus held by the two fixing bolts 200 and 210 and the core limb 120.

In order to avoid that the undervoltage coil 100 can be pushed away from the fixing bolts 200 and 210 or unhooked from these, on the other side of the undervoltage coil -. In the FIG. 4 to the left between the undervoltage coil 100 and the core leg 120 - two wedge elements 400 and 410 are inserted, which move the lower voltage coil 100 to the left or to the left, so that in the FIG. 4 right side of the undervoltage coil 100 is pulled to the left on the fixing bolts 200 and 210. The function of the wedge members 400 and 410 is thus to prevent unhooking of the undervoltage coil.

The two wedge members 400 and 410 could result in an off center arrangement of the undervoltage coil 100, unless the spacers 300 and 310 are provided between the undervoltage coil 100 and the core leg 120. In other words, the function of the spacer elements 300 and 310 is thus in the case of a displacement of the lower voltage coil 100 to the left, which by the wedge elements 400 and 410 is to ensure a centric alignment of the undervoltage coil 100 on the core leg 120.

The wedge elements 400 and 410 are preferably made of plastic, for example glass fiber reinforced plastic; they may be, for example, rod, strip or plate-shaped. In order to ensure insertion into the space or gap between the core limb 120 and the undervoltage coil 100, at least the front end face of the wedge elements, with which they are introduced into the gap or gap, is preferably wedge-shaped.

For wedging the undervoltage coil 100, the wedge elements can also be multi-part, also a plurality of wedge elements can be mounted.

In addition, on the in the FIG. 4 left (second) Zugankerblech 160 additionally a spacer plate are applied, which cooperates with the wedge elements to be hammered. For example, the wedge members may be struck between such a spacer plate and the undervoltage coil 100 to avoid contact with the core leg 120.

LIST OF REFERENCE NUMBERS

10

core leg

20

transformer core

30

Under voltage coil

30a

coil section

40

High voltage coil

40a

coil section

50

carrier profile

60

carrier profile

70

block

80

adjusting pin

100

Under voltage coil

110

yoke

120

core leg

130

Core lamination stack

140

Zugankerblech

150

side surface

160

Zugankerblech

165

side surface

170

core pin

171

core pin

172

core pin

200

Bolt Fixing

210

Bolt Fixing

220

Bolzenhalteausnehmung

230

Bolzenhalteausnehmung

240

pintail

250

pintail

260

Einhängausnehmung

270

Einhängausnehmung

280

Flashing

290

inside

300

spacer

310

spacer

400

key member

410

key member

B

detail

C

detail

Claims (9)

1. Transformer comprising a transformer core (20) having transformer core laminates, comprising at least one high-voltage coil and comprising at least one low-voltage coil (100), wherein a core limb (120) of the transformer core (20) is routed through the low-voltage coil (100),
   wherein
   the low-voltage coil is held by the core limb by way of at least one fixing bolt (200, 210), wherein

   - there is at least one bolt holding recess (220, 230) on a first side of the core limb (120), a first bolt end (240) of the fixing bolt (200, 210) being inserted into the said bolt holding recess,

   - the low-voltage coil (100) has at least one hanging recess (260, 270), and

   - the second bolt end (250) of the fixing bolt (200, 210) is inserted into the hanging recess (260, 270) of the low-voltage coil, and the fixing bolt (200, 210) holds the low-voltage coil (100).
2. Transformer according to Claim 1,
   wherein
   the fixing bolt (200, 210) extends perpendicular, at least approximately perpendicular, to the longitudinal axis of the low-voltage coil (100) and perpendicular, at least approximately perpendicular, to the longitudinal axis of the core limb (120).
3. Transformer according to either of the preceding claims, wherein

   - the core limb (120) has at least two tie rod laminates (140, 160) and at least one core bolt (170, 171, 172) which is routed through the core laminate stack (130) of the core limb (120),

   - wherein a first tie rod laminate (140) is fitted to a first side face (150) of the core laminate stack (130), and a second tie rod laminate (160) is fitted to the opposite second side face (165) of the core laminate stack (130),

   - the two tie rod laminates (140, 150) are connected to one another by the at least one core bolt (170, 171, 172) and press the transformer core laminates of the core laminate stack (130) together, and

   - the at least one bolt holding recess (220, 230) is arranged in the first tie rod laminate (140).
4. Transformer according to one of the preceding claims, wherein

   - the low-voltage coil (100) has an electrical connection laminate (280) which forms an electrical coil connection of the low-voltage coil (100),

   - the electrical connection laminate (280) forms at least one section of the inner face of the low-voltage coil (100), and

   - the at least one hanging recess (260, 270) is arranged in the electrical connection laminate (280).
5. Transformer according to either of Claims 3 and 4, wherein
   at least one spacer element (300, 310) is arranged between the low-voltage coil (100) and the first tie rod laminate (140), which spacer element ensures a prespecified minimum distance between the low-voltage coil (100) and the first tie rod laminate (140).
6. Transformer according to Claim 5,
   wherein
   the spacer element (300, 310) is pushed onto the fixing bolt (200, 210) or is integrally connected to the said fixing bolt.
7. Transformer according to one of the preceding claims,
   wherein
   at least one wedge element (400, 410), which is wedge-shaped at least in sections, is arranged between the second side of the core limb (120), which second side is situated opposite the first side of the core limb (120), and the low-voltage coil (100), which wedge element pushes the low-voltage coil (100) away from the second side of the core limb (120) and therefore pulls the low-voltage coil (100) in the direction of the first side of the core limb (120).
8. Method for producing a transformer, in which method a low-voltage coil (100) is mounted onto a core limb (120) of a transformer core (20) and in the process the core limb (120) is routed through the low-voltage coil (100),
   wherein

   - at least one fixing bolt (200, 210) is inserted or fitted into a bolt holding recess (220, 230) of the core limb (120),

   - the low-voltage coil (100) is mounted onto the core limb (120), specifically initially eccentrically, in order to allow the low-voltage coil (100) to pass by the laterally protruding fixing bolt (200, 210), and

   - as soon as a hanging recess (260, 270), which is provided in the low-voltage coil (100), reaches the level of the fixing bolt (200, 210), the low-voltage coil (100) is moved or displaced and is pushed onto the protruding fixing bolt (200, 210) by way of the hanging recess (260, 270).
9. Method according to Claim 8,
   wherein
   a wedge element (400, 410), which is wedge-shaped at least in sections, is inserted between the core limb (120) and the low-voltage coil (100), and the low-voltage coil (100) is pushed away from the core limb (120) by the wedge element (400, 410) and therefore pulled onto the fixing bolt (200, 210).

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