EP3378077A1

EP3378077A1 - Winding arrangement with foot for vertical potting

Info

Publication number: EP3378077A1
Application number: EP16819853.9A
Authority: EP
Inventors: Richard Sille; Tim-Felix Mai; Steffen Weinert
Original assignee: Siemens AG
Current assignee: Siemens Energy Global GmbH and Co KG
Priority date: 2016-01-15
Filing date: 2016-12-15
Publication date: 2018-09-26
Also published as: CN108463865A; WO2017121568A1; DE102016200457A1; RU2709489C1; BR112018014225A2; US20190027300A1; CN108463865B

Abstract

The aim of the invention is to provide a winding arrangement (1) with a number of winding sections (2a, 2b, …, 2n) arranged one above the other in the axial direction, said winding sections being arranged at a distance from each other and being electrically interconnected such that they form a series connection, the winding arrangement allowing vertical potting with a winding insulation. To this end, at least one foot element (6) is provided, which is connected to a winding section (2a) and is designed to carry the entire winding arrangement (1).

Description

description

Winding arrangement with foot for standing casting

The invention relates to a winding arrangement with a number of vertically stacked winding sections, which are arranged at a distance from each other and electrically connected to form a series circuit.

10

The invention further relates to a method for producing a winding arrangement.

Such a winding arrangement and method are known in the art. For example, from the catalog issued by Siemens AG with the order no. E5001-G640-A143-V2 from 2014 on page 5, a winding arrangement shown, which is used as a high-voltage winding ^¬ winding for a dry-type transformer in the field of energy distribution. The winding ^arrangement shown there has disk windings as winding sections, which are arranged at a distance from each other and completely embedded in a winding insulator. The coil insulator has molded Vergussfüße which are ausgerüs ^¬ tet 25 at its free end with a metallic Abstellabschnitt.

In the case of the previously known production method, winding sections in the form of disc windings are first of all wound on one

™ 30 wound roll wrapped. The disc windings are solely by a fixed Wicklungszug on the winding carrier

> held. The winding arrangement thus formed becomes lying

Potted with a resin and then the resin

Heating is cured for several hours. After

9

35 harden the prior art winding assembly vertically

set up and form with other components a transformer or a choke. The previously known winding arrangement and the previously known method has the disadvantage that the winding arrangement can only be erected after curing of the winding insulation, that is, in other words can be brought into the vertical position. A stable casting foot forms only at the end of the manufacturing process.

The object of the invention is to provide a winding arrangement of the type mentioned, which can be erected early.

This object is achieved on the basis of the above-mentioned Wick ^¬ lungsanordnung by at least one foot element which is connected to a winding section and adapted to support the entire winding arrangement.

Based on the method mentioned above, the invention solves this problem in that winding sections are wound on a winding carrier, the winding layers of mutually insulated electrical conductors, the winding sections are connected to each other via holding means, so that a winding arrangement is provided, in the axial direction one behind the other arranged winding sections, an end-side winding section connected to a foot member having a Fußisolationsabschnitt, each winding section and each foot member with an insulating material standing cast and heated to cure the insulating material. The present invention provided winding arrangement ver ^¬ added via at least one foot element which is connected to a winding ^¬ portion. Thus, the foot element or the foot ^¬ elements carry the entire winding assembly, even if it is erected vertically. In other words, the winding sections can be turned off in a simple manner and thus shed, for example, standing. This ver ^¬ simplifies the manufacture of the winding assembly. The winding section connected to each foot element is expediently se an end-side winding section so for example, the lowermost winding section, so that the or the Fußele ^¬ ment (e) is arranged below the center of gravity of the stacked angeord ^¬ Neten winding sections / are. As Vorteilhafter- at least three foot members as part of the ^invention are the provided.

Advantageously, the winding arrangement is at least in part ^¬ be surrounded by a winding insulator which consists of an FES th Wicklungsisolierstoff. The winding insulator serves as insulating material of the winding, which is at a high voltage ^potential during its operation. The inven tion ^¬ proper winding arrangement is used for example as upper ^¬ voltage winding of a transformer. Notwithstanding the winding arrangement according to the invention is part of a throttle.

Conveniently, the winding insulation material contains resin. Resin, in particular epoxy resin, is an insulating material which is well known to a person skilled in the art and is used regularly in particular for the production of so-called cast resin transformers.

According to an expedient further development in this regard, each foot element has an insulating material section, which consists of an electrically insulating Fußisolierstoff. The Isolierstoffabschnitt of the foot member provides the necessary electrical insulation between the at Be ^¬ operating at high voltage winding portion to which it is connected, and the ground lying on the soil, on which the winding arrangement is turned off.

According to an expedient further development, the winding arrangement is at least partially surrounded by a winding insulator, which consists of a solid Wicklungsisolierstoff, wherein the coefficient of thermal expansion of the

Wicklungsisolierstoffs that of Fußisolierstoffs ent ^¬ speaks. According to this advantageous further development, cracking is avoided, which occurs, for example, at high temperatures. Increase in temperature can arise due to different thermal expansion coefficients. As a winding insulation resin comes with the usual fillers and additives into consideration. Advantageously, the winding insulation material and the foot insulation material are identical.

Conveniently, the Isolierstoffabschnitt of said winding portion to a free Endbe ^¬ reaching out with the end portion arrangement for shutting off the winding is arranged on the floor. The soil is usually at ground potential, as stated earlier. The free end area is equipped with appropriate mounting aids, for example. Thus, for example, metal inserts with internal or external thread can be provided at said end region, which are firmly connected to the Isolierstoffabschnitt.

In a preferred embodiment of the invention holding means are provided. The holding means can in principle be designed as desired. For example, block-shaped holding means are provided, on which rest the winding sections. Preferably, however, retaining means are provided, which have at least one retaining element which extends at least in two adjacently arranged winding portions, wherein said retaining member is fixedly connected to the Wick ^¬ coupling portions into which it extends. The holding elements hold the winding ^sections against each other, whereby a predetermined minimum distance is maintained. The connection of the winding sections with such holding elements is a cost-effective way to mechanically connect the Wick ^¬ ment sections before casting.

According to an expedient further development, each retaining element is designed as a flat insert strip. The flat insertion strips can be particularly easily and easily when winding between the winding layers of Wiek laid sections and connected to the winding layers.

Conveniently, each retaining element is a prepreg. The term "prepreg" comes from English and is a short form ^¬ for "pre-impregnated fibers", a term which could be translated into Deut ^¬ cal with "pre-impregnated fibers." The term prepreg is used for a fiber structure here which is impregnated with an incompletely cured resin, for example, the fibers are glass fibers

Resin of the retaining element preferably has the same thermi ^¬ rule expansion coefficient as the winding insulation. A particular advantage is achieved if the same resin is used for both solid insulators.

Expediently, each winding section has winding layers wound over one another in the radial direction, the winding layers being insulated from one another and having an electrical conductor. The winding sections are, for example, disc windings. Winding sections according to the invention and in particular disc windings are circumferentially closed and define a Scheibenwicklungsin- nenraum, through which, for example, a leg of egg ^¬ lowering and possibly a low-voltage winding can extend.

According to a further expedient in this regard, the winding layers in each coil section are firmly connected to each other ^¬. In contrast to the prior art, in this way a stable hold of the winding layers and thus of each winding section is provided. In ^combination with the holding elements and the foot element, a free-standing vertical winding arrangement is provided even before being embedded in the winding insulation. In other words, the stacked winding sections can be potted standing without a winding support. This allows embedding of the winding sections in the Winding insulator, so that any increase in the wall thicknesses of the winding insulation is possible.

Expediently, the winding layers are firmly connected to one another by means of a hardened resin compound. The resin used for the compound is, for example, the same resin that was used to form the coil insulation. Conveniently, each winding section is circumferentially ge ^¬ closed, the winding portions of the alignment are zueinan ^¬ arranged. The aligned arrangement is necessary to provide an internal cavity for receiving a leg of a core having a low magnetic resistance in comparison with the ambient air such that magnetic flux generated by the winding assembly propagates almost exclusively in the free leg of the core.

Advantageously, each base element and each winding portion are entirely in a solid insulation eingebet ^¬ tet. The complete embedding increases the electrical Iso ^¬ lationsgrad so that the winding arrangement with higher voltages can be applied without these must be spaced further from lying on ground potential components.

Conveniently, the solid insulation defining a Neren in ^¬ cavity, is negotiated between the inner cavity and each winding portion, a continuous inner wall is, having a thickness between 1 mm and 50 mm. According to this advantageous development, the thickness of the insulation layer in the interior of the winding arrangement is considerably increased compared to previously known winding arrangements. The thickness of the inner wall of the solid insulation is limited, in particular by the manufacturing method, when the winding sections are held by winding tension on a winding support and must be cast with this. However, if the winding arrangement has retention tel for holding the winding elements and foot elements, so the winding support can be removed and the winding assembly are cast on the foot elements free standing. The inner wall of a casting mold can thus be spaced arbitrarily far from the inner winding layers of each winding section. This distance corresponds to the later wall thickness of the solid insulation.

According to an expedient embodiment of the method according to the invention, the winding layers are bonded prior to curing of the not fully cured resin. The resin is, for example, part of a resin-impregnated insulating material. An uncured resin in the B state impregnated performance insulating material is for example a "prepreg". The resin of a prepreg is not completely cured from ^¬. In other words, the polymerization of the resin was canceled before all the binding sites of the resin was completely consumed. Such insulating material or prepreg has certain adhesive properties, so that the coil portions can be bonded together, for example on a mandrel threaded ^¬ oped by the prepreg.

Advantageously, however, the winding arrangement is preheated after the bonding of the winding layers and after the introduction of the holding elements prior to the filling of the liquid insulating material. This preheating ensures the curing of all resins in the B-state, so that in each case solid compounds. Then, a self-standing Wicklungsanord ^¬ voltage is provided only lacks the Wicklungsisolie- methodology used during. This "blank" can now be potted standing.

Further expedient configurations and advantages of the ^invention are the subject of the following description of embodiments of the invention with reference to the figures of the drawing, wherein like reference symbols refer to identically acting components and wherein Figure 1 is a perspective view of a winding arrangement ^¬ from below,

FIG. 2 shows a perspective view of a foot element,

3 shows a further embodiment of a Fußele ^¬ ment, Figure 4 shows a further embodiment of the OF INVENTION ^¬ to the invention winding assembly prior to casting with liquid Wicklungsisolierstoff,

Figure 5 shows an embodiment of the invention

Winding arrangement after casting and

Figure 6 shows an embodiment of the invention

Clarify method schematically. FIG. 1 shows an exemplary embodiment of the winding arrangement 1 according to the invention in a perspective view from below. It can be seen that the winding arrangement 1 has a number of disk windings 2, 2b, 2c ... 2n arranged one above the other in the vertical or axial direction, the disk winding 2a later being the lower disk winding of the winding arrangement 1. It can be seen that the disc winding 2a and otherwise all the other disc windings 2b ... 2n is composed of several winding layers 3, which have a band-shaped, ie flat, conductor, which is wound from inside to outside, wherein the respective disc winding 2a , 2b, 2c,... 2n are enlarged in the radial direction 4. The band-shaped conductors are isolated from each other. The insulation is provided in the exemplary embodiment shown in FIG. 1 by a lacquer layer which has been applied to the conductor. From Figure 1 is seen in particular that the disc winding 2a is formed a recess 5, which is adapted to receive a fastening end of a leg member ^¬. Figure 2 shows an embodiment of a foot member 6, which has a mounting end 7 and a remote from the attachment end 7 Abstellende 8. Between the fastening end 7 and the Abstellende 8, an insulating ^¬ material section 9, which consists of an insulating material such. B. consists of an epoxy resin. At the attachment end 7, the foot ^¬ element 6 forms an insertion nozzle 10, which is adapted for insertion into the recess 5 shown in Figure 1. The inlet nozzle is formed in the example shown on the insulating material 9 and also consists of egg ^¬ nem resin-containing insulating material. At the attachment end 8, a metallic mounting means is embedded in the insulating material 9. The metallic mounting medium is equipped with an internal thread.

Figure 3 shows a further embodiment of a leg member 6 OF INVENTION ^¬ to the invention, which has as in Figure 2, a foot member 6 and a Abstellende. 8 As in FIG. 2, the setting end 8 is equipped with metallic mounting means which have an internal thread in order to be able to screw the foot element 6 securely. In contrast to the frusto-conical Isolierstoffabschnitt 9 of the shown in Figure 2 ^¬ execution example of the Isolierstoffabschnitt 9 is cross-shaped design here and has two perpendicular to each other angeord ^¬ designated sub-sections 11 and 12. The subsections 11 and 12 each have mutually aligned Absteilflächen 13 and 14, which is provided for receiving the lowermost disk winding 2a of the winding assembly 1. A recess in the lowermost disk winding has become unnecessary in this way.

FIG. 4 shows the base element 6 shown in FIG. 3 with the disk windings 2a, 2b... 2n stacked one above the other, which are all wound together on a winding carrier 15 as holding means and are held there by pulling force. The disk windings 2a ... 2n and the winding carrier 15 rest together on foot elements 6, which in each case are in one embodiment. Curvature of a mold 16 are turned off. After placing the winding carrier can be removed. The blank shown in FIG. 4 is then cast in a standing position with an electrically insulating resin, so that the entire winding arrangement 1, including the base elements 6, is completely embedded in the resin. Therefore, the foot elements 6 extend after casting in a Vergussfuß that as such already belongs to the prior art, but here was significantly improved by the foot elements for supporting the winding assembly prior to casting. In other words, the resin-containing insulating material provides the strength necessary for holding the winding ^arrangement . The coil assembly 1 shown in Figure 4 for example, serves as an upper voltage ^¬ winding of a transformer, wherein a low-voltage winding and a branch of a magnetic core ^¬ extend in its interior.

In addition, the winding arrangement 1 has, in addition to the winding support 15, further support elements 26 here in the form of annular spacers 26. Contrary to the exemplary embodiment shown, the retaining means may also comprise block-shaped holding blocks. These genann ^¬ th holding elements can provide the necessary support for the winding sections without the winding support 15, so that the winding support 15 can be removed.

Figure 5 shows schematically a transformer 17 having a leg 18 of an iron core and a low voltage Wick ^¬ lung 19, and an embodiment of a winding device 1 according to the invention, which serves as a high-voltage winding. It will be appreciated that extend between the disc windings 2a, 2b, 2n holding members 20a and 20b as Haltemit ^¬ tel. The holding elements 20a and 20b are each formed as a flat insertion strip and each extending through all the disc windings 2a, 2b, 2n of the winding assembly 1. Furthermore, in Figure 5, the winding layers 3 of each winding section 2a, 2b, 2n recognizable. The winding layers 3 are in the embodiment shown in FIG. tion example of an inner side, which faces the leg 18, wound in the radial direction 21 to the outside. With increasing winding layers 3, therefore, each winding section 2a, ... 2n increases from the inside to the outside. The holding means 20a and 20b extend between the winding layers 3 and are fixedly connected thereto, so that the winding sections 2a, ... 2n are held apart from the holding elements 20a and 20b. For this reason, it is possible to mold the winding insulating material in liquid form with the winding sections 2a, 2b, 2n, and then completely cure the winding insulating material by heating under vacuum so that a dry winding 1 is provided as a winding arrangement whose winding ^{sections are} completely in one fixed winding insulator 22 is embedded. It can also be seen from FIG. 5 that the winding layers extend in a ring-shaped manner in a horizontal layer, so that the winding sections 2a,..., 2n form so-called disk windings. The disc windings

2a, ..., 2n are circumferentially closed, so that inside each disc winding 2a, ..., 2n, the leg 18 extends together with the lower voltage winding 19.

FIG. 6 shows the winding of the winding section 2b. It can be seen that a metallic strip conductor 23 is wound together with an insulating film 24 on an already unwrapped Wick ^¬ ment position of the winding section 2b. Here, the label strips 20a, first as a holding means is ^¬ sets. The insert strip 20a is a prepreg and is made of a glass fiber reinforced resin. The resin of the insert strip 20a is not fully cured. The thus a ^¬ wound holding member 20a, after the retaining element has been wrapped in a subsequent winding layer 20b, warmed before ^¬, so that between the respective Wicklungsab ^¬ cut or disc windings 2a, ..., 2n, and prepreg creates a fixed connection. Subsequently, the Wick ^¬ ment carrier 15 can be removed, wherein the holding elements 20a and 20b, the disc windings 2a and 2b, ..., 2n without winding ^¬ insulation 22 can keep at a distance to each other. Furthermore, it can be seen that the insulating film 24 has rhombic regions 25 in which it is impregnated or coated with a resin in the B state. The diamond-shaped areas 25 are formed on both sides of the insulating film 24 ^¬ , wherein the resin is applied dot-shaped in the diamond-shaped areas. During curing after winding, the foils 24 glue the strip conductors 23 together. As a result of the preheating, the resin also hardens in the diamond-shaped regions, so that said connection between the winding layers 3 is reinforced. The resin in the diamond-shaped regions may therefore be referred to as a layer bonding agent.

Claims

claims

1. winding arrangement (1) with a number of axially stacked winding sections ((2a, 2b, 2n), which are arranged at a distance from each other and electrically connected to form a series circuit,

marked by

at least one foot element (6) which is connected to a winding section (2a) and adapted to support the entire winding arrangement (1).

2. Winding arrangement (1) according to claim 1,

d a d u r c h e c e n c i n e s that

the winding sections (2a, 2b, 2n) and each foot element (6) are at least partially surrounded by a winding insulator (22) which is made of a solid winding ^{insulation material} .

3. winding arrangement (1) according to claim 2,

d a d u r c h e c e n c i n e s that

the winding insulating material contains resin.

4. winding arrangement (1) according to one of the preceding arrival proverbs,

d a d u r c h e c e n c i n e s that

each foot element (6) has an insulating section (9, 11, 12) which consists of an electrically insulating Fußisolierstoff.

5. winding arrangement (1) according to claim 4,

d a d u r c h e c e n c i n e s that

each winding section (2a, 2b, 2n), and each foot member (6) is at least partially surrounded by a winding insulator (22) environmentally give the ^¬ is made of a solid Wicklungsisolierstoff be, wherein the thermal expansion coefficient of the winding ^¬ insulation material corresponds to that of the Fußisolierstoffs.

6. winding arrangement (1) according to one of the preceding claims,

d a d u r c h e c e n c i n e s that

the insulating material section (9) extends from the said winding section (2a) to a free end region (8), the end region (8) being arranged to stop the winding arrangement.

7. Winding arrangement (1) according to one of the preceding claims,

marked by

Holding means having at least one holding element (20a, 20n) extending between at least two juxtaposed winding sections (2a, ..., 2n), wherein said holding element (20a, 20b) fixed to the winding sections (2a, ..., 2n) into which it extends.

8. Winding arrangement (1) according to claim 7,

d a d u r c h e c e n c i n e s that

each retaining element is designed as a flat insert strip (20a, 20n).

9. Winding arrangement (1) according to claim 8,

d a d u r c h e c e n c i n e s that

each retaining element (20a, 20n) consists of a fiber-reinforced resin.

10. Winding arrangement (1) according to claim 9,

d a d u r c h e c e n c i n e s that

each winding section (2a, 2b, 2n) has mutually gewi ^¬ ckelte winding layers (3), wherein the winding layers (3) are insulated from each other and having an electrical conductor (23).

11. Winding arrangement (1) according to claim 10,

d a d u r c h e c e n c i n e s that

the winding layers (3) ply-bonding means (25) are firmly connected to each other ^¬.

12. Winding arrangement according to claim 11,

d a d u r c h e c e n c i n e s that

the winding sections (2a, 2b, 2n) are firmly connected to one another by means of a hardened resin compound (25).

13. Winding arrangement (1) according to claim 12,

d a d u r c h e c e n c i n e s that

each winding section (2a, 2b, 2n) is circumferentially closed-sen, the winding sections (2a, 2b, 2n) are disposed volatile ^¬ tend each other.

14. Winding arrangement (1) according to claim 13,

d a d u r c h e c e n c i n e s that

each foot element (6) and each winding section (2a, 2b, 2n) are completely embedded in a winding insulator (22).

15. Winding arrangement (1) according to claim 14,

d a d u r c h e c e n c i n e s that

the coil insulator (22) defines an internal cavity and between the inner cavity and each coil section (2a, ..., 2n), a continuous inner wall of Wick ^¬ lungsisolierstoff is formed having a thickness between 1 mm and 50 mm.

16. A method for producing a winding arrangement (1), in which

Winding sections (2a, 2b, 2n) are wound on a winding support (15) which have winding layers (3) of mutually insulated electrical conductors,

Is provided, the winding portions via holding means (20a, 20n) MITEI ^¬ Nander be connected, so that a winding arrangement (1) which in axial direction one above the other Toggle orderly winding sections (2a, ... 2n) comprises -

- an end-side winding section (2a, ... 2n) connected to a foot ^¬ element (6) having a Fußisolationsabschnitt (9), - Each winding section (2a, 2b, 2n) and each Fussele ^¬ ment (6) encased with an insulating standing and

- Is heated to cure the insulating material.

17. The method according to claim 16,

d a d u r c h e c e n c i n e s that

the holding means comprise at least one retaining element (20a) during the winding of the winding sections (2a, 2b, 2n) Zvi ^¬ rule the winding layers (3) is inserted so that it extends between at least two winding sections (2a, 2b, 2n) he ^¬ stretches.

18. The method according to claim 17,

d a d u r c h e c e n c i n e s that

the winding layers (3) before the curing of the insulating material by a not fully cured resin (25) ^{miteinan ¬} glued.

19. The method according to claim 18,

d a d u r c h e c e n c i n e s that

the winding arrangement (1) after the bonding of the winding layers and after the introduction of the retaining elements (20a, 20b) is each ^¬ but preheated before the curing of the insulation material.