EP2189990B1 - Single phase winding module and arrangement of single phase winding modules - Google Patents

Abstract

The single phase-winding module (10) has an electrical winding (12) having two winding ends and multiple electrical connection devices (14,16,18,20,22,24,26,28), where three electrical connection devices are arranged in one connecting set (38) and other three connecting devices are arranged in another connecting set (40). An electrical connection (30) exists between each connection device of the former connecting set and each connection device latter connecting set.

Description

The invention relates to a single-phase winding module having at least one first electrical winding, which has two winding ends, and with a plurality of electrical Anschlussvorrlchtungen. The invention also relates to an arrangement of single-phase winding modules according to the invention.

It is well known that transformers are used in electrical energy supply networks. Their task is to electrically couple network areas with different voltage levels together. Higher voltages, for example 10 kV or 110 kV, are suitable for transmission over longer distances because the electrical transmission losses are reduced due to the lower current flow.

Electrical power grids are usually designed as three-phase networks, i. as a system of three individual conductors, wherein current and voltage are shifted at a symmetrical network load between the respective conductors by 120 ° to each other.

Consequently, transformers in such three-phase networks are also three-phase, ie with at least three windings to perform, but also three-phase windings or inductors are used, for example, to compensate for reactive electrical power. On the one hand, it is possible to arrange the windings on a common transformer core or, on the other hand, to interconnect three single-phase transformers or winding modules to form a three-phase transformer bank. Depending on the boundary conditions and requirements in the network, for example, a delta connection takes place on the undervoltage side the transformer windings and the high voltage side a Stemschaltung with common center conductor.

From the EP 1973126 A as well as from the DE 1971623 U are each customizable coils for the primary voltage or a switching strip for producing a delta connection of a transformer thrown known

For reasons of economy of costs, single-phase winding modules are preferably of identical construction. The interconnection of single-phase winding modules to such a transformer bank is usually carried out by external connections, for example by means of copper rods or cables, wherein the interconnection into the desired switching group requires a space-consuming crossing or interchanging of the connecting conductors.

A disadvantage of the interconnection of previous similar single-phase winding modules in a star or delta connection is in particular the required high effort in the interconnection, which also is a risk of erroneous misconnections is given.

In the GB 2337863 A a method and means for forming a desired winding configuration are described, wherein the respective winding consists of a few turns, which is loaded on a substrate (printed circuit board) and whose connecting conductors are each arranged adjacent to both sides of the circuit board provided on the closing surfaces.

Based on this prior art, it is an object of the invention to provide a single-phase winding module, which can be particularly easily interconnect to a three-phase winding. It is also an object of the invention to provide a related arrangement of such single-phase winding modules.

This object is achieved by a single-phase winding module having the features specified in claim 1.

Accordingly, the erfindungagemäße single-phase winding module characterized in that at least three electrical connection devices in a first connection group and at least three connection devices in an associated second terminal group are arranged such that there is an electrical connection between each terminal device of the first terminal group and each terminal devices of the second terminal group jewells, whereby each a pair of connecting devices is formed, that the arrangement of the connecting devices said terminal pair is cyclically interchanged with each other and that said first coil is connected to said first of its two coil ends with one of said pairs of connectors and with its second end to another pair of connectors.

Preferably, three single-phase winding modules are interconnected, which corresponds exactly to the number of phases in a three-phase network. The interconnection is ideally realized in such a way that the second terminal group of a first module is connected to the first terminal group of an adjacent further preferably identical module, whereby an intersection or permutation of the connection conductors due to the cyclic permutation already carried out within the single-phase winding module is avoided.

Due to the cyclic permutation of the arrangement of the pairs of connecting devices, in the case of three single-phase winding modules connected in this way, each electrical phase of the connected three-phase network is guided differently in each single-phase winding module. Each at least one first winding of each single-phase winding module is thus connected to at least one of its two winding ends with a different electrical phase. This provides a three-phase interconnection of the single-phase winding modules.

By forming connection pairs and the integration of a cyclic permutation of the electrical connection as part of the single-phase winding module of the effort for the respective external interconnection are advantageously reduced and reduced error sources during installation. In fact, in a circuit according to the invention, all connecting elements between the modules - such as cables or metal rails - are guided without crossing.

In a particularly preferred embodiment of the single-phase winding module according to the invention, the further pair of connecting devices, with which the first winding is connected to its second winding end, is another of the at least three cyclically reversed pairs of connecting devices, such that, when three such single-phase winding modules are connected, a delta connection of these windings results.

In a further preferred embodiment, the first and second terminal groups each have a fourth connection device, wherein these fourth connection devices are electrically connected to each other without cyclic permutation. The fourth terminal device pair thus formed is respectively connected to the second end of the first winding.

Advantageously, such a star connection of at least one first windings of three interconnected inventive single-phase winding modules is realized.

In a further embodiment of a single-phase winding module according to the invention, the geometric arrangement of the connection devices of the first connection group is similar to the geometric arrangement of the connection devices of the second connection group.

By such a similar configuration, for example along a line or in a same angle triangle, the arrangement of connecting elements between a first terminal group of a first module and an opposite second terminal group of a second module is further simplified.

According to a particularly preferred embodiment of the invention, a plurality of identical adjacent single-phase winding modules can be arranged such that the connection devices of the first and second terminal groups of adjacent modules are located exactly opposite each other.

The connecting elements between adjacent modules are accordingly in this case all to be arranged in parallel with each other, whereby a misconnection during assembly is virtually eliminated. It is for example possible that the connection devices of a module are each designed as a recess, for example in the form of a socket, into which a positive connection element, for example a rod-shaped connecting conductor, can be inserted. After inserting all provided connection conductors, it is particularly easy to connect an adjacent module by lateral movement along the connection conductors. Due to the identical construction of the respective single-phase winding modules whose manufacturing costs are also advantageously reduced.

According to a further embodiment, the terminal devices of the first and the second terminal groups located opposite one another of adjacent single-phase winding modules can be connected directly to one another by plug-in connections, wherein additional connecting elements are advantageously avoided. In this case, for example, the connection devices of the first connection group are formed as bush-shaped recesses and the corresponding counterparts of a second connection group of a structurally identical module as a positively molded connector. However, it is quite feasible to design the connection devices of the first and second connection groups differently.

Due to the resulting elimination of the connecting elements, an electrical connection of single-phase winding modules can be realized by simply telescoping the single-phase winding modules associated connection elements and thus further advantageously advantageous.

In a further embodiment, the single-phase winding module according to the invention has a third and one associated fourth terminal group and a second electrical winding, wherein the first winding is magnetically coupled to the second winding, which with at least one of its two winding ends with a terminal device pair of the third and fourth connection group is connected. A magnetic coupling is realized, for example, by a common arrangement of first and second winding around a magnetic core, for example made of iron. However, this is known to the person skilled in the art from transformer construction.

Such a single-phase winding module thus has a primary and a secondary winding, which are in a certain gear ratio to each other and can be used as a single-phase transformer. The connections of the primary winding are led out here in the first and second terminal group and the terminals of the secondary winding in the third and fourth terminal group. This results in at least six connector pairs.

By an electrical connection of three such single-phase winding modules, the functionality of a three-phase transformer is realized in an advantageous manner.

Depending on whether the respectively second end of the first or second winding of a single-phase winding module is performed on a fourth, non-cyclically reversed connection device pair or on another of the three cyclically reversed connection device pairs of the associated terminal groups, each a star or delta circuit of realized first and second windings.

Thus, the common switching groups of three-phase transformers can be realized by interconnecting three identical single-phase winding modules. The respective switching group is predetermined by the respective single-phase winding modules to be interconnected. It is of course also possible to realize in this way a three-phase transformer with a tertiary winding, in which case a fifth and sixth terminal group are still to be arranged. For each star connection of a winding, it is preferable to lead the interconnected star point through a fourth, not cyclically interchanged terminal device pair.

In an advantageous embodiment of the single-phase winding module according to the invention, this is encapsulated with a suitable insulation medium, for example based on a resin. Such resins are available both as a one-component resin and as a two-component resin with base material and hardener, the latter variant having the advantage of a lower curing temperature of the resin after casting.

In a molded single-phase winding module, preferably all windings and the connections between the pairs of connecting devices are enclosed by the insulating material. The terminal groups are anchored in the potting material or embedded in this, so that a very high mechanical Resilience of a potted module is realized. In addition, the susceptibility to contamination is advantageously reduced. A terminal group can be either a number of individual connection devices, which are arranged without direct connection elements on or in the surface of the single-phase winding module, for example by encapsulation. However, a connection module can also be an assembly with a plurality of connection devices, which is arranged as a group on or in the surface of the single-phase winding module.

In a preferred embodiment of the single-phase winding module, the first winding and / or the second winding are provided for an electrical voltage of at least 1 kV. From this voltage level, the use of three-phase transformers is particularly useful and the advantages of the invention, for example, the reduced effort in the interconnection of modules, comes particularly to fruition. Of course, single-phase winding modules according to the invention are also advantageous for higher voltages, for example 10kV, 110kV or 380kV.

The object is also achieved by an arrangement of three single-phase winding modules, which are arranged side by side and electrically connected to each other via the respective terminal groups. Particularly space-saving is the arrangement of the modules along a horizontal or vertical line.

In a variant of the arrangement according to the invention, all single-phase winding modules are identical. On the one hand, this reduces their production costs through synergy effects and also reduces the stock of replacement transformers. In the case of a three-phase transformer, at least one complete replacement transformer is to be provided for storage, whereas in the arrangement according to the invention the storage of a single single-phase winding module is sufficient.

In various embodiments of the arrangement according to the invention, star and / or delta connection of the respective windings are realized.

According to a further embodiment of the arrangement according to the invention more than three, but preferably an integer multiple of three, that is six, nine, twelve, fifteen etc. of such single-phase winding modules interconnected. In this way, the power of the transformer bank formed by interconnection can be adapted to the respective requirements, for example in the form of an increase in performance in a grid expansion. It is particularly advantageous that always only identical modules are interconnected.

Further advantageous embodiment possibilities can be found in the further dependent claims.

Reference to the embodiments illustrated in the drawings, the invention, further embodiments and other advantages will be described in detail.

Fig. 1

ein exemplarisches erstes Einphasen-Wicklungsmodul,

Fig. 2

eine exemplarische Sternschaltung von Einphasen-Wicklungsmodulen,

Fig. 2

eine exemplarische Dreieckschaltung von Einphasen-Wicklungsmodulen,

Fig. 4

eine exemplarische Verschaltung von drei Einphasen-Wicklungsmodulen zu einem Dreiphasen-Transformator sowie

Fig. 5

eine exemplarische Anordnung von drei Einphasen-Wicklungsmodulen

Show it:

Fig. 1

an exemplary first single-phase winding module,

Fig. 2

an exemplary star connection of single-phase winding modules,

Fig. 2

an exemplary delta connection of single-phase winding modules,

Fig. 4

an exemplary interconnection of three single-phase winding modules to a three-phase transformer as well

Fig. 5

an exemplary arrangement of three single-phase winding modules

Fig. 1 shows an exemplary parallelepiped-like first single-phase winding module 10 with a first terminal group 38 and a second terminal group 40 in a schematic sectional view. The first terminal group 38 has a first 14, a second 16, a third 18 and a fourth 20 terminal device, which are arranged along a line equidistant and parallel to each other. The connecting devices 15, 16, 18, 20 are formed as a rod-shaped elevation of a conductive material, such as copper, similar to a plug.

On the opposite side of the single-phase winding module 10, the fifth 22, sixth 24, seventh 26 and eighth 28 terminal devices of the associated second terminal group 40 are also arranged along a line at equidistant intervals. The first connection device 14 is connected to the sixth connection device 24 via a cyclically exchanged first electrical connection 30, the second connection device 16 is connected to the seventh connection device 26 via a cyclically exchanged third electrical connection 34 and the third connection device 18 is connected to the fifth connection device 22 via a cyclically exchanged second electrical connection 32. The fourth connection device 20 is connected to the eighth connection device 28 via a non-cyclically interchanged fourth connection 36.

The connection devices 22, 24, 26, 28 of the second connection group are each in the form of a sleeve-like recess whose interior is adapted in a form-fitting manner to the plug-like connection devices 14, 16, 18, 20 of the first connection group 38 located opposite. Thus, the connection devices of the first connection group 38 of the first single-phase winding module 10 can be pushed into the connection devices of a second connection group 40 of a structurally identical single-phase winding module 10, whereby a direct electrical contact between the respective connection devices [14, 16, 18, 20], [22, 24, 26, 28]. Preferably, such a connector includes a spring-like mechanism that ensures a secure electrical contact even with minor tolerances of the respective connection devices.

A first winding 12 of the first single-phase transformer 10 is connected at its first end to the cyclically reversed first terminal device pair, which is formed from the third 18 and fifth 22 terminal device. The second end of the winding is connected to the fourth non-cyclically exchanged terminal device pair, which is formed from the fourth 20 and eighth 28 terminal devices.

Fig. 2 shows an exemplary star connection of three identical single-phase winding modules. Reference numeral 112 shows three single-phase winding modules pushed one inside the other, in which the respective second end of the winding conductor of the respective windings X1, X2, X3 is guided onto the common center conductor N1. It is good to see that the connection devices of the individual modules mesh with each other and thus an electrical connection between the single-phase winding modules produce. The corresponding electrical equivalent circuit diagram is identified by reference numeral 114.

Fig. 3 shows in an analogous manner an exemplary delta connection of three identical single-phase winding modules. Reference number 122 shows three single-phase winding modules pushed one inside the other, in which the respective second end of the winding conductor of the respective windings X1, X2, X3 is routed to another cyclically reversed connecting device pair. Reference number 124 identifies the equivalent electrical equivalent circuit diagram.

Fig. 4 shows an exemplary interconnection 50 of three identical cuboid single-phase winding modules 52, 54, 56, which are arranged side by side along a line, not shown, to a three-phase transformer. Each single-phase winding module 52, 54, 56 has on its one side a first and a third terminal group and on the respective opposite side an associated second or fourth terminal group, wherein the adjacent single-phase winding modules 52, 54, 56 as described Fig. 1 interconnected with each other.

The single-phase winding modules 52, 54, 56 are assumed to be potted, i. the contour formed from the magnetic core, the windings and the other components is cast with a corresponding resin and, for example, a predominantly cuboid or disc-shaped outer contour is formed.

The first windings 68, 70, 72 of the single-phase transformer winding modules 52, 54, 56 are electrically connected in delta, the entire interconnection being designated by reference numeral 58. A connection of the transformer bank formed by the single-phase transformer winding modules 52, 54, 56 with the first three-phase conductors R1, S1, T1 to the first terminal group of arranged in a peripheral position second single-phase transformer winding module 52. By way of example, the cyclic permutation of the looped three-phase conductor in the fourth Single-phase transformer winding module 56 indicated by the reference numeral 62.

The first windings 68, 70, 72 of the respective single-phase winding modules 52, 54, 56 are connected via a respective magnetic coupling 80, 82, 84 to the associated second winding 74, 76, 78. A magnetic coupling is realized, for example, by a common arrangement of first 80, 82, 84 and second 74, 76, 78 winding around a magnetic core, for example made of iron. The transmission ratio between the respective first and second windings is, for example, 1 to 10, as required, for example, for a transformer with a rated voltage of 1 kV / 10 kV.

The electrical connection of the second windings 74, 76, 78 is indicated by the reference numeral 60. These are arranged in star connection, wherein each winding is guided in this case with one of its two ends to a common center conductor. The connection of the transformer bank with the second three-phase conductors R2, S2, T2 and the center conductor N2 is analogous to the connection with the first three-phase conductors R1, S1, T1. The cyclic permutation of three of the four looped conductors is again indicated by way of example in the fourth single-phase winding module 56 with the reference number 64.

Fig. 5 shows a further exemplary arrangement of three assumed as identical, identical construction single-phase winding modules 94, 96, 98 in a three-dimensional view. The single-phase winding modules essentially correspond to those in Fig.2 shown modules 52, 54, 56 and are arranged along a line at a distance which is marked with the reference numeral 102.

Seven connection devices of the first and third connection group are each pronounced as a plug-like survey and summarily designated by the reference numeral 100. Not shown are the corresponding counterparts of the second and fourth terminal groups on the respective opposite side of the single-phase winding modules 94, 96, 98. The counterparts are socket-like pronounced, adapted form-fitting to the engraver-like elevations and each arranged along a line with the connection devices shown.

The single-phase winding modules are to be pushed into one another by a displacement process along the distance indicated by the reference numeral 102, so that at their contiguous arrangement an electrical connection is given.

Bezuaszeichenliste

10

Exemplary first single-phase winding module

12

First winding of the first single-phase winding module

14

First connection device

16

Second connection device

18

Third connection device

20

Fourth connection device

22

Fifth connection device

24

Sixth connection device

26

Seventh connection device

28

Eighth connection device

30

First electrical connection

32

Second electrical connection

34

Third electrical connection

36

Fourth electrical connection

38

First connection group

40

Second connection group

50

Exemplary interconnection of three single-phase winding modules

52

Second single-phase winding module

54

Third single-phase winding module

56

Fourth single-phase winding module

58

Interconnecting the first windings of the single-phase winding modules in a delta connection

60

Interconnection of the second windings of the single-phase winding modules in a star connection

62

First cyclic exchange of electrical connections

64

Second cyclic exchange of electrical connections

68

First winding of the second single-phase winding module

70

First winding of the third single-phase winding module

72

First winding of the fourth single-phase winding module

74

Second winding of the second single-phase winding module

76

Second winding of the third single-phase winding module

78

Second winding of the fourth single-phase winding module

80

First magnetic coupling

82

Second magnetic coupling

84

Third magnetic coupling

90

Exemplary arrangement of three single-phase winding modules

94

Fifth single-phase winding module

96

Sixth single-phase winding module

98

Seventh single-phase winding module

100

Connection devices of the first and third terminal group of the seventh single-phase winding module

102

distance

110

Star connection of single-phase winding modules

112

First arrangement of single-phase winding modules

114

Equivalent circuit diagram for star connection

120

Delta connection of single-phase winding modules

122

Second arrangement of single-phase winding modules

124

Equivalent circuit diagram for delta connection

R1, S1, T1

phase identification

R2, S2, T2

phase identification

N1, N2

neutral

X1, X2, X3

windings

Claims (15)

1. Single-phase winding module (10, 52, 54, 56, 94, 96, 98) having at least one first electric winding (12, 68, 70, 72, X1, X2, X3) which has two winding ends, and having a plurality of electrical connecting apparatuses (14, 16, 18, 20, 22, 24, 26, 28, 100), with in each case at least three electrical connecting apparatuses (14, 16, 18) being arranged in a first connection group (38), and in each case at least three connecting apparatuses (22, 24, 26) being arranged in an associated second connection group (40), with there being an electrical connection (30, 32, 34) in each case between each connecting apparatus (14, 16, 18) in the first connection group (38) and each connecting apparatus (22, 24, 26) in the second connection group (40), by which means a connecting apparatus pair (14, 24) (16, 26), (18, 22) is in each case formed, and the first winding (12, 68, 70, 72, X1, X2, X3) is connected by the first of its two winding ends to one of these connecting apparatus pairs (14, 24), (16, 26), (18, 22), and is connected by its second end to a further connecting apparatus pair,
   characterized in that
   the arrangement of the connecting apparatuses in these connecting apparatus pairs (14, 24), (16, 26), (18, 22) is cyclically interchanged (62, 64) with one another.
2. Single-phase winding module according to Claim 1, characterized in that the further connecting apparatus pair, to which the first winding (12, 68, 70, 72, X1, X2, X3) is connected by its second winding end, is a further one of the at least three cyclically interchanged connecting apparatus pairs (14, 24), (16, 26), (18, 22) such that connection of three such single-phase winding modules results in these windings being connected in delta (124).
3. Single-phase winding module according to Claim 1, characterized in that the first connection group (38) and the second connection group (40) each have a fourth connecting apparatus (20, 28), in that these fourth connecting apparatuses (20, 28) are electrically connected to one another (36) without being cyclically interchanged, thus forming a fourth connecting apparatus part (20, 28), and in that the first winding (12, 68, 70, 72) is electrically connected by its second winding end thereto (20, 28), such that connection of three such single-phase winding modules results in the windings being connected in star (114).
4. Single-phase winding module according to one of the preceding claims, characterized in that the geometric arrangement of the connecting apparatuses (14, 16, 18, 20) in the first connection group (38) is similar to the geometric arrangement of the connecting apparatuses (22, 24, 26, 28) in the second connection group (40).
5. Single-phase winding module according to one of the preceding claims, characterized in that a plurality of physically identical mutually adjacent single-phase winding modules (10, 52, 54, 56, 94, 96, 98) can be arranged such that the connecting apparatuses (14, 16, 18, 20, 22, 24, 26, 28, 100) of the first (38) and second connection groups (40) of adjacent modules (52, 54, 56), (94, 96, 98) are each located opposite one another.
6. Single-phase winding module according to Claim 5, characterized in that the connecting apparatuses (14, 16, 18, 20, 22, 24, 26, 28, 100), which are located opposite on another, in the first (38) and a second (40) connection group can be connected to one another by plug connections for electrical connection purposes.
7. Single-phase winding module according to one of the preceding claims, characterized in that this single-phase winding module (10, 52, 54, 56, 94, 96, 98) has a third and an associated fourth connection group as well as a second electrical winding (74, 76, 78), with the respective first winding (68, 70, 72) being magnetically coupled (80, 82, 84) to the second winding (74, 76, 78), and in that this second electrical winding (74, 76, 78) is connected by at least one of its two winding ends to a connecting apparatus pair (14, 24), (16, 26), (18, 22) in the third and fourth connection groups.
8. Single-phase winding module according to Claim 7, characterized in that the third and fourth connection groups are designed to correspond to the first (38) and second (40) connection groups according to one of Claims 5 or 6.
9. Single-phase winding module according to one of the preceding claims, characterized in that this single-phase winding module is encapsulated.
10. Single-phase winding module according to one of the preceding claims, characterized in that the first winding (12, 68, 70, 72, X1, X2, X3) and/or the second winding (74, 76, 78) is intended for an electrical voltage of at least 1kV.
11. Arrangement of three single-phase winding modules (10, 52, 54, 56, 94, 96, 98) corresponding to one of Claims 1 to 10, characterized in that the single-phase winding modules (10, 52, 54, 56, 94, 96, 98) are arranged alongside one another, and are electrically connected to one another (58, 60) via the respective connection groups (38, 40).
12. Arrangement according to Claim 11, characterized in that the single-phase winding modules (10, 52, 54, 56, 94, 96, 98) are physically identical.
13. Arrangement according to Claim 11 or 12, characterized in that the first winding (12, 68, 70, 72, X1, X2, X3) and/or the second winding (74, 76, 78) are each connected to one another in an electrical star circuit (60, 114).
14. Arrangement according to Claim 11 or 12, characterized in that the first winding (12, 68, 70, 72, X1, X2, X3) and/or the second winding (74, 76, 78) are each connected to one another in an electrical delta circuit (58, 124).
15. Arrangement according to one of Claims 11 to 14, characterized in that the number of single-phase winding modules (10, 52, 54, 56, 94, 96, 98) is an integer multiple of three.

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