WO2024056382A1

WO2024056382A1 - Coil assembly for a power voltage transformer

Info

Publication number: WO2024056382A1
Application number: PCT/EP2023/073770
Authority: WO
Inventors: Udo Prucker; Wolfgang Knab; Andreas WINDERLICH
Original assignee: Siemens Energy Global GmbH & Co. KG
Priority date: 2022-09-16
Filing date: 2023-08-30
Publication date: 2024-03-21
Also published as: DE102022209761A1

Abstract

The invention relates to a coil assembly (20) for a power voltage transformer (100), wherein the coil assembly (20) comprises two identical high-voltage coils (10) connected in parallel, and each high-voltage coil is constructed as a transformer with a primary winding (11) and a secondary winding (12). The invention additionally relates to a corresponding power voltage transformer and to the use of the coil assembly in such a power voltage transformer.

Description

Coil arrangement for a power-voltage converter

The present invention relates to a coil arrangement for a, in particular inductive, power voltage converter, in particular for voltage conversion in high-voltage energy supply systems.

Such power voltage transformers (English: Power Voltage Transformer) are preferably designed as transformers or transformer devices which are connected on the primary side directly to high-voltage lines or busbars for high voltages, for example up to several hundred kilovolts. On the secondary side, electrical power can be made available at relatively low secondary voltages, for example at secondary voltages of up to a few hundred volts. Such transformer devices are suitable, for example, for self-supplying substations or for supplying energy to rural areas or construction sites from high-voltage networks.

In order to increase the performance of such measuring transducers, an obvious measure, for example, is to adapt a wire or conductor cross-section and thus the power loss in the device to a corresponding output power. However, this requires more space for both windings and therefore a larger size or results in a less compact structure of the entire active part. Alternatively or additionally, the induction and a core cross section of the magnetic core used can be varied within certain limits to optimize performance via the parameter of the number of windings.

An increase in the core cross-section or However, a core window results in higher core costs and causes an increase in the size of the coil, especially with regard to the width and height of the winding, which then has a negative effect on the heat dissipation from the component. Increasing the size of the coil also disadvantageously results in higher production costs for the entire component - due to the greater use of material - since in particular the housing and possibly a voltage connection would have to be adapted or designed differently. The larger coil weight therefore has a negative effect on the connection or the assembly of the component, since in particular larger cranes or assembly devices and/or more complex support must be provided.

It is therefore an object of the present invention to provide an improved coil arrangement for power-voltage converters, which in particular allows the components in question to be provided with a significantly increased total current or to operate with a significantly increased overall performance.

This task is solved by the subject matter of the independent patent claims. Advantageous refinements are the subject of the dependent patent claims.

One aspect of the present invention relates to a coil arrangement for a, in particular inductive, power-voltage converter, wherein the coil arrangement has at least two, i.e. H . comprises two or more similar high-voltage coils that are connected in parallel or can be connected accordingly. The high-voltage coils are each constructed like a transformer with a primary winding on the high-voltage side and a secondary winding on the low-voltage side. Accordingly, the high-voltage coils are preferably coils or coil components designed partially, i.e. on the primary side, for high-voltage applications.

Furthermore, the coil arrangement according to the invention is preferably designed for power-voltage converter applications, in particular in single-phase operation. By connecting the two coils in parallel (on the primary side), the total current and thus the total power can be advantageously increased, in particular doubled, with the same core cross section and while avoiding the disadvantages mentioned above. Accordingly, the power-voltage converter as a component has the opportunity to provide, withdraw or withdraw significantly higher powers (output powers). to process .

Furthermore, the thermal behavior of each individual coil (individual high-voltage coil) is advantageously maintained without the disadvantages described above occurring, in particular a larger coil having to be provided, which is characterized, among other things, by a significantly poorer heat output.

Furthermore, the housing diameter is advantageously similar or identical to that of a device of the same design, which, for example, only provides half the output power.

Advantageously, when using the coil arrangement according to the invention in power-voltage converters, only the housing has to be enlarged in one dimension, which is less noticeable in terms of costs than an increase in the conductor or magnetic core cross section.

In addition, the handling of the coil arrangement for the purposes described during or during assembly is advantageously facilitated due to two separate or individual coils or coil pairs.

In one embodiment, the secondary windings of the high-voltage coils are or will each be located further inside the coils or Coil arrangement arranged, and the primary windings are each further out. In one embodiment, the two similar high-voltage coils are designed or assembled identically. This embodiment offers in particular the advantages of assembly, commissioning and overall dimensioning of the coil arrangement for its intended use, which are described in detail above. However, in deviation from this embodiment, the advantages according to the invention can also be partially exploited with only similar, but not completely identical, high-voltage coils.

In one embodiment, the two similar high-voltage coils are mounted symmetrically on a common magnetic core made of layered and/or pressed sheet iron or Arranged in a cut strip core design. This configuration is particularly advantageous for the electrical properties of the coil arrangement for voltage conversion applications in high-voltage technology, in particular for reducing losses and increasing efficiency.

In one embodiment, the primary windings of the high-voltage coils are wound in such a way that corresponding magnetic field strengths - during the intended operation of the coil arrangement or the voltage converter - have the same sense of direction in the magnetic core; or . the same (revolving) field direction.

In one embodiment, the primary winding is rotationally symmetrical, for example toroidal or plate-like, coiled or formed. This configuration is particularly advantageous for the electrical properties of the coil arrangement for voltage conversion applications, in particular for reducing losses and increasing efficiency.

In one embodiment, the primary windings of the two similar high-voltage coils are each set up to be electrically connected in parallel with a high voltage to be transformed. In one embodiment, the coil arrangement - in comparison to a comparison model or component of the high-voltage coil with the same magnetic core cross section - is designed to produce a total current on the secondary side or to increase, in particular to double, the overall performance of the power-voltage converter.

In one embodiment, the coil arrangement is not suitable for a cascaded arrangement of the individual high-voltage coils; or . the corresponding coil components are not electrically connected in series.

A further aspect of the present invention relates to a power-voltage converter comprising the coil arrangement described, with the two similar high-voltage coils being arranged in a parallel connection. This design and configuration of the power-voltage converter makes it possible, with a compact design, to also utilize the advantages according to the invention for the higher-level component.

In one embodiment, the two similar high-voltage coils are arranged one above the other (vertically) in accordance with the intended arrangement of the power-voltage converter. This configuration advantageously enables a compact design of the power-voltage converter.

In one embodiment, the two similar high-voltage coils are arranged on opposite legs of a common magnetic core of the coil arrangement. wrapped around this. This configuration also advantageously enables a compact design of the coil arrangement.

In one embodiment, a main insulating medium within a housing of the power-voltage converter is gaseous during its operation, in particular synthetic or purified air. This configuration can expediently achieve reliable insulation and at the same time Climate-damaging sulfur hexafluoride can be dispensed with as an insulation medium.

A further aspect of the present invention relates to the use of the coil arrangement described above for increasing, in particular doubling, the total current and / or the total power of (or in or on) a power-voltage converter (s).

Refinements, features and/or advantages that relate to the coil arrangement in the present case can also directly affect the power-voltage converter, and vice versa.

As used herein, the term "and/or" or "or" when used in a series of two or more elements means that any of the listed elements may be used alone, or any combination of two or more of the listed elements can be used.

Further details of the invention are described below with reference to the figures.

Figure 1 shows a known design of an inductive power-voltage converter with a single (high-voltage) coil arrangement.

Figure 2 shows an embodiment of a power-voltage converter with the coil arrangement according to the invention, comprising two (individual) high-voltage coil components connected in parallel.

In the exemplary embodiments and figures, elements that are the same or have the same effect can each be provided with the same reference symbols. The elements shown and their size ratios to one another are generally not to be viewed as true to scale; rather, individual elements may be shown with exaggerated thickness or large dimensions for better display and/or better understanding. Figure 1 shows a conventional power-voltage converter 100 with a known coil device. The coil shown expediently represents a high-voltage coil 10 or a pair of coils with a high-voltage winding. In other words, the high-voltage coil 10 has a primary winding 11 and a secondary winding 12 to be connected, for example, to a voltage to be transformed. Accordingly, the coil is preferably designed as a transformer, which enables or predestines high-voltage measurement - just like the coil arrangement according to the invention described from FIG. 2 onwards - in high-voltage power supply systems.

Furthermore, the coil 10 has a magnetic core 21, preferably made of sheet iron, which is suitably designed for high-frequency applications. Further parts of the power-voltage converter having the described coil 10 are partially indicated in FIG. 1, but are not explicitly marked with reference numerals.

In certain applications of such voltage converters for high voltage applications there is a need to increase the power output or to increase the total currents and overall performance of the component on the secondary side. This requirement is met with the coil arrangement according to the invention for inductive voltage converter applications.

A component 100 according to the invention is described in FIG. 2. The power-voltage converter 100 according to the invention has an improved coil arrangement 20. In contrast to the arrangement of Figure 1, the coil arrangement 20 according to the invention has at least two similar high-voltage coils 10 connected in parallel, with both high-voltage coils 10 each - also designed like a transformer - being constructed with a primary winding 11 and a secondary winding 12. In the exemplary illustrations, the secondary windings 12 of the two coil components 10 are only rudimentarily arranged further into the interior of the coil, whereas the primary windings 11 on the high-voltage side are further out.

All or individual coil windings can, for example, be insulated against each other or with oil-paper insulation. be isolated in individual layers.

The windings of the high-voltage coils 10, in particular their primary windings 11, are further arranged in a plate-like or torus-like manner around the magnetic core 21. This magnetic core 21 can be used for AC voltage applications or Mains operation in the manufacture of the coil arrangement is preferably prefabricated, in particular from layered or pressed iron sheets. The coil (s) is then preferably first wound on a support tube and only then is the core closed and completed for the magnetic field connection.

The similar high-voltage coils 10 are preferably designed identically.

It can also be seen in FIG. 2 that the two similar high-voltage coils 10 are arranged symmetrically on the magnetic core 21. The high-voltage coils 10 are also arranged one above the other in parallel connection in the higher-level component of the power-voltage converter 100. For this purpose, an electrical connection or bushing 13 between the two individual coil arrangements is also shown in FIG.

2 also shows that the two similar high-voltage coils 10 are arranged on opposite legs of the common magnetic core 21 of the coil arrangement 20. are wrapped around them. The reference number 101 indicates a (main) insulation medium 101 within a housing or tank of the power-voltage converter 100 (not further marked), which can be gaseous, preferably synthetic or purified air.

Contrary to what is shown in the present figures, the present invention understandably also includes a corresponding triple, quadruple or multiple arrangement of similar high-voltage coils, which can be set up, wound or connected analogously to the two similar high-voltage coils described and accordingly bring with them the advantages according to the invention . In other words, according to the invention, more than two, i.e. H . For example, three, four or even more similar high-voltage coils 10 - connected in parallel - wound around the magnetic core 21 described or be arranged.

In the arrangement according to the invention of individual, similar high-voltage coil arrangements of a specific design in parallel connection one above the other, a compact design of the voltage converter is achieved in particular. First and foremost, the design ensures that overall performance or The total output current of the power-voltage converter can advantageously be increased, in particular doubled. In particular, this technical advantage is achieved with a core cross-section that is the same - for example in comparison to a component shown in FIG. 1 - without any further design of the components or the adjustment or optimization of further parameters are required.

Usually, the high voltage of the voltage converters for energy supply devices is tapped via a high-voltage connection, in particular an aluminum tube 2. Furthermore, as can be seen in FIG. 2, the component expediently has insulation 1 surrounding the voltage connection 2. The power-voltage converter 100 is shown here only in a rudimentary or schematic manner. However, it is evident that the coil concept according to the invention can basically be used for any type of inductive voltage converter, as it can be used in a correspondingly scalable manner. This means it can be used in many designs of power voltage converters.

Claims

Patent claims

1. Coil arrangement (20) for a power-voltage converter (100), wherein the coil arrangement (20) comprises two similar high-voltage coils (10) connected in parallel, both high-voltage coils each being constructed like a transformer with a primary winding (11) and a secondary winding (12). .

2. Coil arrangement (20) according to claim 1, wherein the secondary windings (12) are each arranged further inside the coils and the primary windings (11) are each arranged further outside.

3. Coil arrangement (20) according to claim 1 or 2, wherein the two similar high-voltage coils (10) are identical.

4. Coil arrangement (20) according to one of the preceding claims, wherein the two similar high-voltage coils (10) are arranged symmetrically on a magnetic core (21) made of layered sheet iron or designed as a cut strip core.

5. Coil arrangement (20) according to claim 4, wherein the primary windings (11) of the high-voltage coils (10) are wound such that corresponding magnetic field strengths in the magnetic core have the same direction.

6. Coil arrangement (20) according to one of the preceding claims, wherein the primary windings (11) of the two similar high-voltage coils are each set up to be electrically connected to a high voltage to be transformed.

7. Coil arrangement (20) according to one of the preceding claims, which - in comparison to a component with the same Magnetic core cross section - is designed to increase, in particular to double, the overall performance of the power-voltage converter.

8. Power-voltage converter (100), comprising the coil arrangement (20) according to one of the preceding claims, wherein the two similar high-voltage coils (10) are arranged in a parallel connection.

9. Power-voltage converter (100) according to claim 8, wherein the two similar high-voltage coils (10) are arranged one above the other in accordance with the intended arrangement of the power-voltage converter.

10. Power-voltage converter (100) according to claim 8 or 9, wherein the two similar high-voltage coils (10) are arranged on opposite legs of a common magnetic core (21) of the coil arrangement (20).

11. Power-voltage converter (100) according to one of claims 8 to 10, wherein an insulating medium is gaseous, in particular synthetic or purified air.

12. Use of the coil arrangement (20) according to one of claims 1 to 7 to increase the total current and / or the total power of a power-voltage converter (100).