EP2369602B1 - Assembly with at least two coils axially stacked on the same core leg - Google Patents

Description

The invention relates to an arrangement with at least two on a common core leg axially superposed coils, each coil having at least two radially superposed windings and barriers are provided between the windings.

An application is given in coils and transformers, especially in dry-type transformers.

It is customary in transformers to arrange two or more coils axially one above the other on a core leg, wherein each coil has an inner winding respectively lower voltage winding and an outer winding respectively high voltage winding. Depending on the interconnection of the coils, the distance between two coils required with regard to a sufficient dielectric strength is calculated. It is also common to arrange between the inner winding and the outer winding of a coil barriers to prevent electrical flashover between the two windings.

In the patent US 2924799 A a corresponding arrangement is disclosed with a plurality of coils located axially adjacent to one another on a common core limb, wherein respective barriers are provided between adjacent coils.

In Fig. 4 For this purpose, a lateral section through an arrangement with at least two coils according to the prior art is shown. It is a core thigh 7 to recognize on which a first coil 1 and a second coil 4 are arranged axially one above the other. The first coil 1 has two windings 2, 3 arranged radially one above the other, whereby winding 2 is also referred to as an inner winding or undervoltage winding and winding 3 is also referred to as an outer winding or a high-voltage winding. The second coil 4 has two radially superposed windings 5, 6, wherein winding 5 are also referred to as inner winding respectively lower voltage winding and winding 6 as outer winding respectively high-voltage winding.

Between the inner winding 2 and the outer winding 3 of the first coil 1, a plurality of barriers 51 are arranged in order to reliably prevent an electrical flashover between the two windings 2, 3. In a similar manner, a plurality of barriers 52 are arranged between the inner winding 5 and the outer winding 6 of the second coil 4 in order to reliably prevent an electrical flashover between the two windings 5, 6.

The axial distance between the two coils 1, 4 to be predetermined as a function of the wiring of the coils and the voltage differences is denoted by A1 (measured between the inner windings 2, 5). The barrier supernatant, d. H. the projection of a barrier over the end face of a winding arranged perpendicular to the winding axis W is designated B (measured between winding 3 and barrier 51 or between winding 6 and barrier 52).

Especially for higher voltages or voltage differences, the required barrier projections over the windings of the individual coils are relatively large and thus lead to an extension of the core legs - see the necessary core leg length L1.

The invention has for its object to provide an optimized with respect to the necessary dimensioning arrangement with at least two on a common core leg axially superimposed coils.

This object is achieved according to a first embodiment in conjunction with the preamble of claim 1 according to the invention that the barriers adjacent coils are radially offset from one another and that the edge regions of the barriers mesh with each other like a comb.

This object is achieved according to a second embodiment in conjunction with the preamble of claim 2 according to the invention that the barriers of the immediately adjacent areas of adjacent coils are alternately shortened and lengthened, so that always a shortened barrier of a coil an extended barrier of the other coil and, conversely, an extended barrier of one coil facing a shortened barrier of the other coil and followed by a shortened barrier on each coil over an extended barrier.

An exemplary prior art according to US 2,924,799 A discloses that the barriers are partially formed in the form of insulation rings, which additionally engage around the arranged perpendicular to the winding axis faces of the windings.

The advantages achieved by the invention are, in particular, that the core leg length of the coil or of the transformer can be reduced, which leads to an overall more compact construction of the coil or of the transformer. The barrier arrangement is designed such that electrical flashovers from the outer winding to the inner winding are avoided, although the axial distance of the coils is reduced to each other.

Advantageous embodiments of the invention are shown in the subclaims.

Fig. 1

einen seitlichen Schnitt durch eine optimierte Anordnung mit mindestens zwei Spulen gemäß einer ersten Ausführungsform,

Fig. 2

einen seitlichen Schnitt durch eine optimierte Anordnung mit mindestens zwei Spulen gemäß einer zweiten Ausführungsform,

Fig. 3

einen seitlichen Schnitt durch eine Anordnung mit mindestens zwei Spulen gemäß dem Stand der Technik,

Fig. 4

einen seitlichen Schnitt durch eine Anordnung mit mindestens zwei Spulen gemäß dem Stand der Technik.

The invention will be explained below with reference to the embodiments illustrated in the drawings. Show it:

Fig. 1

FIG. 2 a lateral section through an optimized arrangement with at least two coils according to a first embodiment, FIG.

Fig. 2

a lateral section through an optimized arrangement with at least two coils according to a second embodiment,

Fig. 3

a side section through an arrangement with at least two coils according to the prior art,

Fig. 4

a lateral section through an arrangement with at least two coils according to the prior art.

In Fig. 1 is a side section through an optimized arrangement with at least two coils according to a first embodiment shown. It can be seen a core leg 7, on which a first coil 1 and a second coil 4 are arranged axially above one another. The first coil 1 has two windings 2, 3 arranged radially one above the other, winding 2 also being referred to as an inner winding and winding 3 also as an outer winding. The second coil 4 has two radially superposed windings 5, 6, wherein winding 5 are also referred to as inner winding and winding 6 as an outer winding. The central axis of the core leg 7 is likewise the winding axis W.

Between the inner winding 2 and the outer winding 3 of the first coil 1 are barriers 9, 10, 11, 12, 13 arranged to reliably prevent electrical flashover between the two windings 2, 3. Similarly, between the inner winding 5 and the outer winding 6 of the second coil 4 barriers 15, 16, 17, 18, 19 are arranged to reliably prevent electrical flashover between the two windings 5, 6.

The barriers 9 - 13 and 15 - 19 on the diameter - with the central axis of the core leg = winding axis W - are arranged so that an axial approach of the two coils 1, 4 can be achieved without barrier contact. As can be seen, the barriers of adjacent coils are arranged radially offset from one another, and the edge regions of the barriers 9-13 and 15-19 mesh with one another like a comb. This results overlap areas U between the barriers of the adjacent coils 1, 4. The barrier projections B are unchanged from the embodiment according to Fig. 4 , Advantageous results in comparison to axial distance A1 (see Fig. 4 ) reduced axial distance A2. Accordingly, there is a reduced core leg length L2.

In Fig. 2 a lateral section through an optimized arrangement with at least two coils is shown according to a second embodiment. It can be seen a core leg 7, on which a first coil 1 and a second coil 4 are arranged axially above one another. The first coil 1 has two windings 2, 3 arranged radially one above the other, winding 2 also being referred to as an inner winding and winding 3 also as an outer winding. The second coil 4 has two radially superposed windings 5, 6, wherein winding 5 are also referred to as inner winding and winding 6 as an outer winding.

Between the inner winding 2 and the outer winding 3 of the first coil 1 are barriers 21, 22, 23, 24, 25 arranged to reliably prevent an electrical flashover between the two windings 2, 3. Similarly, between the inner winding 5 and the outer winding 6 of the second coil 4 barriers 27, 28, 29, 30, 31 are arranged to reliably prevent electrical flashover between the two windings 5, 6.

The barriers 21 - 25 and 27 - 31 of the immediately opposite areas of both coils 1, 4 alternately shortened and lengthened, so that a shortened barrier of a coil opposite to an extended barrier of the other coil and a coil on an extended barrier shortened barrier follows. Overlap areas between the barriers of the adjacent coils 1, 4 result. Such an axial approach of the two coils 1, 4 can be achieved without any barrier contact. The barrier protrusion B of an extended barrier corresponds to the barrier protrusion B of the embodiment according to Fig. 4 , A shortened barrier 21, 28, 23, 30, 25 is immediately opposite an extended barrier 27, 22, 29, 24, 31, without touching the opposite barriers. Advantageously results in comparison to the axial distance A1 (see Fig. 4 ) reduced axial distance A2. Accordingly, there is a reduced core leg length L2.

In Fig. 3 is a side sectional view of an exemplary arrangement with at least two coils according to the prior art shown. It can be seen a core leg 7, on which a first coil 1 and a second coil 4 are arranged axially above one another. The first coil 1 has two windings 2, 3 arranged radially one above the other, winding 2 also being referred to as an inner winding and winding 3 also as an outer winding. The second coil 4 has two radially superposed windings 5, 6, wherein winding 5 are also referred to as inner winding and winding 6 as an outer winding.

Between the inner winding 2 and the outer winding 3 of the first coil 1 barriers 33, 36, 37, 40 and insulating rings as a barrier 34/35, 38/39 are arranged to reliably prevent electrical flashover between the two windings 2, 3 , Similarly, between the inner coil 5 and the outer coil 6 of the second coil 4, barriers 42, 45, 46, 49 and insulating rings are arranged as barrier 43/44, 47/48 to form an electrical flashover between the two coils 5 6 to prevent reliable. The insulation rings 34/35 additionally engage around the end faces of the inner winding 2 arranged perpendicular to the winding axis W, the insulation rings 38/39 additionally engage around the end faces of the outer winding 3 arranged perpendicular to the winding axis W, the insulation rings 43/44 additionally engage around the end face the inner winding 5, the insulation rings 47/48 additionally engage around the end face of the outer winding 6. Advantageously, results in comparison to the axial distance A1 (see Fig. 4 ) reduced axial distance A3. Accordingly, there is a reduced core leg length L3.

• Die vorstehend beschriebenen Maßnahmen sind für Spulen 1, 4 mit kreisrundem, ovalem oder rechteckigem Querschnitt anwendbar.
• Die Barrieren 9 - 13, 15 - 19, 21 - 25, 27 - 31, 33 - 40, 42 - 49 sind aus einem elektrisch isolierenden Kunststoff ausgebildet.
• Die Barrieren 9 - 13, 15 - 19, 21 - 25, 27 - 31, 33 - 40, 42 - 49 benachbarter Spulen 1, 4 sollen sich nicht berühren, damit kein durchgehender Kriechweg an dieser Stelle bereitgestellt wird.
• Die Barrieren 9 - 13, 15 - 19, 21 - 25, 27 - 31, 33 - 40, 42 - 49 können in die Spule 1, 4 mit eingewickelt werden und folgen damit automatisch der Spulenform. Die Barrieren 9 - 13, 15 - 19, 21 - 25, 27 - 31, 33 - 40, 42 - 49 können andererseits auch als vorgeformte Bauteile - jeweils angepasst an Form und

In general, for the embodiments and examples explained above:

• The measures described above are applicable to coils 1, 4 with circular, oval or rectangular cross-section.
• The barriers 9 - 13, 15 - 19, 21 - 25, 27 - 31, 33 - 40, 42 - 49 are formed of an electrically insulating plastic.
• The barriers 9 - 13, 15 - 19, 21 - 25, 27 - 31, 33 - 40, 42 - 49 adjacent coils 1, 4 should not touch, so that no continuous creepage path is provided at this point.
• The barriers 9 - 13, 15 - 19, 21 - 25, 27 - 31, 33 - 40, 42 - 49 can be wrapped in the coil 1, 4 with and thus automatically follow the coil shape. On the other hand, the barriers 9 - 13, 15 - 19, 21 - 25, 27 - 31, 33 - 40, 42 - 49 can also be adapted as preformed components - in each case adapted to the shape and

• Zwischen der inneren Wicklung 2, 5, den einzelnen Barrieren 9 - 13, 15 - 19, 21 - 25, 27 - 31, 33 - 40, 42 - 49 und der äußeren Wicklung 3, 6 können Leisten angeordnet sein, um längs des Umfangs definierte Abstände zu erhalten.
• Die Zeichnungen sind gewissermaßen verzerrt, um das erfindungsgemäße Prinzip darzustellen und nicht maßstabsgetreu bezüglich der Abmessungen einer Spule / Wicklung und der dargestellten Abstände zwischen den Wicklungen.
• Bei den vorstehend behandelten Ausführungsformen und Beispielen sind beispielhaft jeweils fünf Barrieren eingesetzt. Der Barrierenanzahl ist nach oben keine Grenze gesetzt. Die Ausführungsform nach Figur 1 ist bereits bei einer einzigen Barriere funktionsfähig, die Ausführungsform nach der Figur 2 und das Beispiel nach der Figur 3 sind bereits bei zwei Barrieren funktionsfähig.
• Selbstverständlich sind bei der Konfiguration der Barrieren auch Kombinationen der vorstehenden Ausführungsformen und Beispiele realisierbar. Insbesondere ist das Beispiel gemäß Fig. 3 hinsichtlich der im mittleren Bereich zwischen den Wicklungen angeordneten Barrieren mit den Ausführungsformen gemäß Figur 1 oder Figur 2 kombinierbar.

Dimensions of the coil 1, 4 - be formed.

• Between the inner winding 2, 5, the individual barriers 9 - 13, 15 - 19, 21 - 25, 27 - 31, 33 - 40, 42 - 49 and the outer winding 3, 6 strips may be arranged to along the circumference to get defined distances.
• The drawings are to some extent distorted to illustrate the principle of the invention and not to scale with respect to the dimensions of a coil / winding and the distances shown between the windings.
• In the embodiments and examples discussed above, five barriers are used by way of example. The number of barriers has no upper limit. The embodiment according to FIG. 1 is already functional at a single barrier, the embodiment according to the FIG. 2 and the example after the FIG. 3 are already functional at two barriers.
• Of course, in the configuration of the barriers, combinations of the above embodiments and examples can be realized. In particular, the example is according to Fig. 3 with respect to the middle between the windings arranged barriers with the embodiments according to FIG. 1 or FIG. 2 combined.

LIST OF REFERENCE NUMBERS

1

first coil

2

inner winding of the first coil

3

outer winding of the first coil

4

second coil

5

inner winding of the second coil

6

outer winding of the second coil

7

core leg

8th

-

9

barrier

10

barrier

11

barrier

12

barrier

13

barrier

14

-

15

barrier

16

barrier

17

barrier

18

barrier

19

barrier

20

-

21

barrier

22

barrier

23

barrier

24

barrier

25

barrier

26

-

27

barrier

28

barrier

29

barrier

30

barrier

31

barrier

32

-

33

barrier

34

Isolation ring as a barrier

35

Isolation ring as a barrier

36

barrier

37

barrier

38

Isolation ring as a barrier

39

Isolation ring as a barrier

40

barrier

41

-

42

barrier

43

Isolation ring as a barrier

44

Isolation ring as a barrier

45

barrier

46

barrier

47

Isolation ring as a barrier

48

Isolation ring as a barrier

49

barrier

50

-

51

barrier

52

barrier

A1, A2, A3

axial distance between two coils

B

Barriers supernatant

L1, L2, L3

Core leg length

U

overlapping areas

W

winding axis

Claims (5)

1. Arrangement comprising at least two coils (1,4) arranged axially one above the other on a common core limb (7), wherein each coil has at least two windings (2, 3, 5, 6) arranged radially one above the other and barriers are provided between the windings (2, 3, 5, 6), characterized in that the barriers (9 - 13, 15 - 19) of adjacent coils (1, 4) are radially offset with respect to one another, and in that the edge regions of the barriers (9 - 13, 15 - 19) engage in one another in a comb-like manner.
2. Arrangement comprising at least two coils (1,4) arranged axially one above the other on a common core limb (7), wherein each coil has at least two windings (2, 3, 5, 6) arranged radially one above the other and barriers are provided between the windings (2, 3, 5, 6), characterized in that the barriers (21 - 25, 27 - 31) of the mutually directly opposite areas of adjacent coils (1, 4) are alternately shortened and lengthened, with the result that a shortened barrier (21, 23, 25) of the one coil (1) always lies opposite a lengthened barrier (27, 29, 31) of the other coil (4) and, conversely, a lengthened barrier (22, 24) of the one coil (1) always lies opposite a shortened barrier (28, 30) of the other coil (4) and, in each coil (1, 4), a shortened barrier always follows a lengthened barrier.
3. Arrangement according to either one of Claims 1 and 2, characterized in that the barriers (9 - 13, 15 - 19, 21 - 25, 27 - 31) are wound into the coil (1, 4) and therefore automatically follow the shape of the coil.
4. Arrangement according to either one of Claims 1 and 2, characterized in that the barriers (9 - 13, 15 - 19, 21 - 25, 27 - 31) are designed as pre-formed components, in each case matched to the shape and dimensions of the coil (1, 4).
5. Arrangement according to either one of Claims 1 and 2, characterized in that blocks are arranged between the inner winding (2, 5), the individual barriers (9 - 13, 15 - 19, 21 - 25, 27 - 31) and the outer winding (3, 6) in order to maintain defined spacings along the circumference.

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