EP2405451B1 - Multiphase dry-type transformer with at least two coils - Google Patents

Description

The invention relates to a multiphase dry-type transformer with at least two coils.

In three-phase transformers usually the three coils are arranged in electrically safe distance next to each other. Especially at high voltages, the necessary distances between the coils associated with the three phases become relatively large in order to withstand the voltage stresses in the surge voltage test. Overall, this leads to a less compact design of the transformer.

The Patent US 3302 149 A discloses a three-phase transformer with plate-like insulating elements inserted between the adjacent windings. The patent CN 101645348 A discloses a polyphase transformer with intermediate barriers held by holders. The patent CS 271050 B1 discloses a transformer winding having a plurality of hollow cylindrical interleaved winding modules, wherein barriers are disposed in a gap formed therebetween. The Patent US 4837543 A discloses a single-phase transformer having a carrier-like isolation element for spacing adjacent sides of a winding module. The patent WO 2009/138099 A1 discloses a polygonal toroidal transformer with winding modules, wherein plate-like insulating elements are arranged between the winding modules.

The invention has for its object to provide a multi-phase dry-type transformer with at least two coils, which allows a compact design even at high voltages.

This object is achieved by a multi-phase dry-type transformer according to claim 1 or claim 3.

Two coils can also be used for a single-phase transformer in which a coil is placed on a core with two legs on each leg.

The advantages that can be achieved with the invention are, in particular, that the necessary distances between the coils can be significantly reduced as a result of the arrangement of the intermediate-phase barriers in the space between the individual coils. This achieves a compact construction of the dry-type transformer. In this case, each gap can be used both a single barrier and a plurality of juxtaposed barriers. The latter can be interconnected by spacers, which are preferably not arranged in the edge region, in order to increase the creepage path as efficiently as possible. Furthermore, it is advantageous to provide a creepage distance extension in the form of spacers at the ends of the barrier in the direction of (grounded) press beams / yokes.

Advantageous embodiments of the invention are characterized in the subclaims.

Fig. 1 - 6

unterschiedliche Ausführungsformen von Zwischen-Phasen-Barrieren,

Fig. 7 - 14

unterschiedliche Ausführungsformen von Abstandshaltern zu einem Pressbalken/Joch eines Trocken-Transformators,

Fig. 15, 16

unterschiedliche Ausführungsbeispiele von mit Abstandshaltern bestückten Zwischen-Phasen-Barrieren.

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

Fig. 1 - 6

different embodiments of inter-phase barriers,

Fig. 7 - 14

different embodiments of spacers to a press beam / yoke of a dry-type transformer,

Fig. 15, 16

different embodiments of equipped with spacers between-phase barriers.

• Gemäß Fig. 1 sind plattenförmige Barrieren 4 in Form gerader, planebener, rechtwinkliger Platten vorgegebener Länge, Breite und Höhe als Zwischen-Phasen-Barrieren eingesetzt.
• Gemäß Fig. 2 sind in Erweiterung zur Konfiguration gemäß Fig. 1 jeweils Kriechweg-Verlängerungen 5 an den Außenkanten (Enden) der plattenförmige Barrieren 4 angesetzt. Diese Kriechweg-Verlängerungen 5 können z. B. einen dreieckförmigen Querschnitt aufweisen, wie gezeigt.
• Gemäß Fig. 3 werden einstückige Formteile 6 zur Bildung der Zwischen-Phasen-Barrieren verwendet. Diese einstückigen Formteile 6 weisen insbesondere an ihren Aussenkanten zweckmäßig den Kriechweg verlängernde, integrierte Formgebungen auf.
• Gemäß Fig. 4 ist jede Zwischen-Phasen-Barriere zweiteilig in Form von zwei parallel nebeneinander angeordneten Platten 7, 8 ausgebildet.
• Gemäß Fig. 5 sind in Erweiterung zur Konfiguration gemäß Fig. 4 jeweils mehrere Abstandshalter 9 zwischen den beiden Platten 7, 8 angeordnet, wobei diese Abstandshalter 9 vorzugsweise nicht im Kantenbereich, sondern hierzu in Richtung zur Plattenmitte hin versetzt angeordnet sind, um auf diese Weise eine Verlängerung des Kriechweges zu gewährleisten.
• Gemäß Fig. 6 sind in Abwandlung der Ausführungsformen gemäß Fig. 4 oder 5 zwei parallel zueinander angeordnete Platten 10, 11 mit jeweils abgebogenem Endstück als Teile der Zwischen-Phasen-Barriere vorgesehen, wobei wahlweise Abstandshalter 9 zwischen diesen Platten 10, 11 vorgesehen sind.

In the Fig. 1 - 6 different embodiments of inter-phase barriers are shown. In the figures, a view of three juxtaposed coils 1, 2, 3 of a three-phase dry-type transformer is shown, in each case between the coils 1 and 2 and between the coils 2 and 3 is provided an existing of an electrically insulating material inter-phase barrier:

• According to Fig. 1 plate-shaped barriers 4 are used in the form of straight, flat, rectangular plates of predetermined length, width and height as intermediate-phase barriers.
• According to Fig. 2 are in extension to the configuration according to Fig. 1 each creepage path extensions 5 at the outer edges (ends) of the plate-shaped barriers 4 attached. This creepage extensions 5 can z. B. have a triangular cross-section, as shown.
• According to Fig. 3 integral moldings 6 are used to form the inter-phase barriers. These one-piece moldings 6 have expediently on their outer edges on the creepage extending, integrated shapes.
• According to Fig. 4 Each intermediate-phase barrier is formed in two parts in the form of two plates 7, 8 arranged parallel to one another.
• According to Fig. 5 are in extension to the configuration according to Fig. 4 in each case a plurality of spacers 9 are arranged between the two plates 7, 8, wherein these spacers 9 are preferably arranged not offset in the edge region, but in the direction towards the plate center, in order to ensure an extension of the creepage path in this way.
• According to Fig. 6 are in a modification of the embodiments according to Fig. 4 or 5 two mutually parallel plates 10, 11 provided with each bent end piece as parts of the inter-phase barrier, optionally spacers 9 are provided between these plates 10, 11.

• Gemäß Fig. 7 weist der Abstandshalter 13 eine Nut 15 im Klotz 14 auf, welcher allseitig von mindestens einer Isolationsplatte 16 überragt wird. Die Breite dieser Nut 15 entspricht der Breite der plattenförmigen Barriere 4 oder der Breite des einstückigen Formteils 6 oder der Breite der Konfiguration "Platte 7 + Abstandshalter 9 + Platte 8" oder der Breite der Konfiguration "Platte 10 + Abstandshalter 9 + Platte 11 ".
• Gemäß Fig. 8 weist der Abstandshalter 19 zwei parallele Nuten 20, 21 im Klotz 14 auf, welcher allseitig wiederum von mindestens einer Isolationsplatte 16 überragt wird. Die Breite dieser Nuten 20, 21 entspricht der Breite der Platten 7, 8 oder 10, 11. Vorteilhaft kann bei Verwendung des Abstandshalters 19 auf Abstandshalter 9 zwischen den Platten 7, 8 oder 10, 11 verzichtet werden.
• Gemäß Fig. 9 weist der Abstandshalter 23 eine einseitig endseitig geschlossene Nut 24 im Klotz 14 auf, was den Vorteil hat, dass eine zusätzliche seitliche Fixierung der Zwischen-Phasen-Barriere geschaffen wird, d. h. dieser Abstandshalter 23 wird vorzugsweise in den Eckbereichen der Zwischen-Phasen-Barriere zum Einsatz gelangen.
• Gemäß Fig. 10 weist der Abstandshalter 26 zwei einseitig endseitig geschlossene Nuten 27, 28 im Klotz 14 auf, was den Vorteil hat, dass eine zusätzliche seitliche Fixierung der Platten 7, 8 der Zwischen-Phasen-Barriere geschaffen wird, d. h. dieser Abstandshalter 26 wird ebenfalls vorzugsweise in den Eckbereichen der Zwischen-Phasen-Barriere zum Einsatz gelangen.

In the Fig. 7 - 13 different embodiments of spacers are shown to a press beam / yoke of a dry-type transformer. These spacers serve to provide a defined distance between the inter-phase barrier and the commonly grounded press beam / yoke of the dry-type transformer. The spacers consist of a pad of an electrically insulating material having at least one groove on its upper side for receiving an inter-phase barrier, wherein the side surfaces of the pad are surmounted by at least one insulating plate, so as to provide a Kriechwegverlängerung achieve. The bottom side of the pad comes into contact with the press beam / yoke. Both FIGS. 7-10 is a view of a spacer shown:

• According to Fig. 7 the spacer 13 has a groove 15 in the block 14, which is surmounted on all sides by at least one insulation plate 16. The width of this groove 15 corresponds to the width of the plate-shaped barrier 4 or the width of the one-piece molding 6 or the width of the configuration "plate 7 + spacer 9 + plate 8" or the width of the configuration "plate 10 + spacer 9 + plate 11".
• According to Fig. 8 the spacer 19 has two parallel grooves 20, 21 in the block 14, which in turn is surmounted on all sides by at least one insulation plate 16. The width of these grooves 20, 21 corresponds to the width of the plates 7, 8 or 10, 11. Advantageously, can be dispensed with spacers 9 between the plates 7, 8 or 10, 11 when using the spacer 19.
• According to Fig. 9 the spacer 23 on one side closed end groove 24 in the block 14, which has the advantage that an additional lateral fixation of the inter-phase barrier is provided, ie this spacer 23 is preferably in the corner regions of the inter-phase barrier to Get used.
• According to Fig. 10 the spacer 26 has two closed on one side end grooves 27, 28 in the block 14, which has the advantage that an additional lateral fixation of the plates 7, 8 of the inter-phase barrier is provided, ie this spacer 26 is also preferably in the Corner areas of the intermediate-phase barrier are used.

Fig. 11 shows in addition to the FIGS. 7 and 9 a side view of a spacer 13 or 23 with block 14, groove 15 or 24 and three parallel insulation plates 16, wherein the bottom side 17 of the pad 14 comes into contact with a presser bar / yoke.

Fig. 12 shows in addition to Fig. 11 a side view of a practical application of a spacer 13 or 23 with an inserted into the groove 15 or 24 configuration "plate 7 + spacer 9 + plate 8" to provide the inter-phase barrier.

Fig. 13 shows in addition to the FIGS. 8 and 10 a side view of a spacer 19 or 26 with block 14, groove 20 or 27, groove 21 or 28 and three parallel insulation plates 16, wherein the bottom side 17 of the pad 14 comes into contact with a presser bar / yoke.

Fig. 14 shows in addition to Fig. 13 a side view of a practical application of a spacer 19 or 26 with an inserted into the groove 20 or 27 plate 7 and with an inserted into the groove 21 or 28 plate 8 to provide the inter-phase barrier.

In the Fig. 15, 16 different embodiments of equipped with spacers between-phase barriers are shown. In Fig. 15 there is shown an inter-phase barrier created between coils 1 and 2, which is formed from a "plate 7 + a plurality of spacers 9 + plate 8" configuration, this configuration at its lower and upper outer edges respectively into the grooves 15 of spacers 13 is inserted.

In Fig. 16 is shown between the coils 2 and 3 created between-phase barrier, which is formed of two plates 7, 8, said plates are inserted at its lower and upper outer edge in the corner regions in the grooves 27, 28 of spacers 26.

LIST OF REFERENCE NUMBERS

1

Kitchen sink

2

Kitchen sink

3

Kitchen sink

4

plate-shaped barrier as an intermediate-phase barrier

5

Creepage extensions at the ends of the plate-shaped barrier

6

one-piece molding to form an intermediate-phase barrier

7

Plate as part of an intermediate-phase barrier

8th

Plate as part of an intermediate-phase barrier

9

spacer

10

Plate with each bent tail as part of an intermediate-phase barrier

11

Plate with each bent tail as part of an intermediate-phase barrier

12

-

13

Spacer to a press beam / yoke of a dry transformer

14

block

15

groove

16

insulation plate

17

Bottom side of the log

18

-

19

Spacer to a press beam / yoke of a dry transformer

20

groove

21

groove

22

-

23

Spacer to a press beam / yoke of a dry transformer

24

one-sided end closed groove

25

-

26

Spacer to a press beam / yoke of a dry transformer

27

one-sided end closed groove

28

one-sided end closed groove

Claims (8)

1. Polyphase dry-type transformer having at least two coils (1, 2, 3), wherein an interphase barrier (4, 6, 7, 8, 10, 11) consisting of an electrically insulating material is arranged in the interspace between the individual coils, wherein the interphase barrier (4, 6) is in the form of an individual barrier wherein, the interphase barrier (4) is formed as a plate-shaped barrier in the form of a straight, planar, rectangular plate, characterized in that leakage path extensions (5) are attached to the outer edges of the plate-shaped barrier.
2. Polyphase dry-type transformer according to Claim 1, characterized in that the interphase barrier (6) is formed as an integral molding with integrated leakage path extensions.
3. Polyphase dry-type transformer having at least two coils (1, 2, 3), wherein an interphase barrier (4, 6, 7, 8, 10, 11) consisting of an electrically insulating material is arranged in the interspace between the individual coils, characterized in that the interphase barrier (7, 8, 10, 11) is in the form of a plurality of barriers arranged next to one another.
4. Polyphase dry-type transformer according to Claim 3, characterized in that the barriers arranged next to one another each have bent-back end pieces.
5. Polyphase dry-type transformer according to Claim 3, characterized in that the barriers arranged next to one another are connected to one another by spacers (9).
6. Polyphase dry-type transformer according to either of Claims 1 and 3, characterized in that the interphase barrier (4, 6, 7, 8, 10, 11) is connected to pressing bars/yokes via spacers (13, 19, 23, 26).
7. Polyphase dry-type transformer according to Claim 6, characterized in that the spacer (13, 19, 23, 26) is formed from a block (14) of an electrically insulating material which has at least one slot (15, 20, 21, 24, 27, 28) in its upper side for receiving the interphase barrier (4, 6, 7, 8, 10, 11) and beyond which at least one insulating plate (16) protrudes.
8. Polyphase dry-type transformer according to Claim 7, characterized in that the slot (24, 27, 28) for stopping a corner region of the interphase barrier (4, 6, 7, 8, 10, 11) is closed at one end.

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