Coil assembly for a power voltage transformer

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

[0001] Description

[0002] Coil arrangement for a power voltage converter

[0003] The present invention relates to a coil arrangement for a, in particular inductive, power voltage converter, in particular for voltage conversion in high-voltage power supply systems.

[0004] Such power voltage transformers are preferably designed as or like transformers or transformer devices, which are connected directly on the primary side to high-voltage lines or busbars for high voltages, for example, up to several hundred kilovolts. On the secondary side, electrical power can be provided at relatively low secondary voltages, for example, at secondary voltages up to several hundred volts. Such transformer devices are suitable, for example, for the self-supply of substations or the energy supply of rural areas or construction sites from high-voltage grids.

[0005] To increase the performance of such transducers, an obvious measure would be to adapt the wire or conductor cross-section, and thus the power loss in the device, to the corresponding output power. However, this requires more space for both windings and thus results in a larger or less compact design of the entire active component. Alternatively or additionally, the induction and the core cross-section of the magnetic core used can be varied within certain limits to optimize performance using the number of windings.

[0006] However, enlarging the core cross-section or core window results in higher core costs and causes the coil to be larger, particularly with regard to the width and height of the winding, which then has a negative impact on heat dissipation from the component. Enlarging the coil also has the disadvantage of increasing production costs for the entire component due to the greater use of material, as the housing and, if applicable, a voltage connection would have to be adapted or designed differently. The greater coil weight therefore has a negative impact on the connection and assembly of the component, as larger cranes or assembly devices and / or more complex support must be provided.

[0007] 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 operated with a significantly increased total current or a significantly increased total power.

[0008] This problem is solved by the subject matter of the independent patent claims. Advantageous embodiments are the subject matter of the dependent patent claims.

[0009] One aspect of the present invention relates to a coil arrangement for a, in particular inductive, power voltage converter, wherein the coil arrangement comprises at least two, i.e. two or more, similar high-voltage coils connected in parallel or to be connected or connectable accordingly. The high-voltage coils are each constructed like a transformer or as 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.

[0010] Furthermore, the coil arrangement according to the invention is preferably designed for power-voltage converter applications, particularly 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 aforementioned disadvantages. Accordingly, the power-voltage converter, as a component, has the option of providing, extracting, or processing significantly higher power (output power).

[0011] Furthermore, the thermal behavior of each individual coil (individual high-voltage coil) is advantageously maintained without the disadvantages described above occurring, in particular that a larger coil must be provided, which is characterized, among other things, by significantly poorer heat dissipation.

[0012] Furthermore, the housing diameter is advantageously similar or identical to that of a device of the same design which, for example, provides only half the output power.

[0013] Advantageously, when using the coil arrangement according to the invention in power voltage converters, only the housing needs to be enlarged in one dimension, which has a less noticeable cost impact than an increase in the conductor or magnetic core cross section.

[0014] 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 pairs of coils.

[0015] In one embodiment, the secondary windings of the high-voltage coils are or will be arranged further inside the coils or coil arrangement, and the primary windings are each located further outside. In one embodiment, the two similar high-voltage coils are designed or assembled identically. This embodiment offers in particular the advantages described in detail above with regard to assembly, commissioning and overall dimensioning of the coil arrangement for its intended use. In contrast to this embodiment, the advantages according to the invention can, however, also be partially exploited with high-voltage coils that are only similar, but not completely identical.

[0016] In one embodiment, the two identical high-voltage coils are arranged symmetrically on a common magnetic core made of layered and / or pressed sheet iron or in a cut-core design. This design is particularly advantageous for the electrical properties of the coil arrangement for voltage conversion applications in high-voltage technology, especially for reducing losses and increasing efficiency.

[0017] 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 direction in the magnetic core; or the same (circulating) field direction.

[0018] In one embodiment, the primary winding is wound or formed rotationally symmetrically, for example, torus-like or plate-like. This embodiment is particularly advantageous for the electrical properties of the coil arrangement for voltage conversion applications, especially for reducing losses and increasing efficiency.

[0019] In one embodiment, the primary windings of the two identical high-voltage coils are each configured to be electrically connected in parallel to a high voltage to be transformed. In one embodiment, the coil arrangement is configured to increase, in particular double, a total secondary current or total power of the power voltage converter compared to a comparable model or component of the high-voltage coil with the same magnetic core cross-section.

[0020] 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.

[0021] A further aspect of the present invention relates to a power-voltage converter comprising the described coil arrangement, wherein the two identical high-voltage coils are arranged in a parallel circuit. This design and configuration of the power-voltage converter makes it possible, with a compact design, to utilize the advantages of the invention for the higher-level component as well.

[0022] In one embodiment, the two identical high-voltage coils are arranged vertically one above the other, in accordance with the intended arrangement of the power-voltage converter. This embodiment advantageously enables a compact design of the power-voltage converter.

[0023] In one embodiment, the two identical high-voltage coils are arranged on or wound around opposite limbs of a common magnetic core of the coil arrangement. This embodiment also advantageously enables a compact design of the coil arrangement.

[0024] In one embodiment, a main insulating medium within a housing of the power-voltage converter is gaseous during operation, in particular synthetic or purified air. This embodiment advantageously allows for reliable insulation while simultaneously eliminating the need for climate-damaging sulfur hexafluoride as an insulating medium.

[0025] 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).

[0026] Embodiments, features and / or advantages which relate to the coil arrangement in the present case may also directly relate to the power voltage converter, and vice versa.

[0027] As used herein, the term "and / or" or "respectively," when used in a series of two or more elements, means that any one of the listed elements may be used alone, or any combination of two or more of the listed elements may be used.

[0028] Further details of the invention are described below with reference to the figures.

[0029] Figure 1 shows a known design of an inductive power voltage converter with a single (high voltage) coil arrangement.

[0030] 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.

[0031] In the exemplary embodiments and figures, identical elements or elements with equivalent functions can each be provided with the same reference numerals. The elements shown and their relative sizes are generally not to scale; rather, individual elements may be shown to be exaggeratedly thick or large for clarity and / or clarity. 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, which can be connected, for example, to a voltage to be transformed, and a secondary winding 12.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 Figure 2 onwards - in high-voltage power supply systems.

[0032] Furthermore, the coil 10 has a magnetic core 21, preferably made of sheet iron, designed for high-frequency applications. Other parts of the power-voltage converter having the described coil 10 are partially indicated in Figure 1, but are not explicitly identified by reference numerals.

[0033] In certain applications of such high-voltage voltage transformers, there is a need to increase the power output or the total secondary currents and total power of the component. This requirement is met by the coil arrangement according to the invention for inductive voltage transformer applications.

[0034] A component 100 according to the invention is described in Figure 2. The power voltage converter 100 according to the invention has an improved coil arrangement 20. In contrast to the arrangement in Figure 1, the coil arrangement 20 according to the invention has at least two similar high-voltage coils 10 connected in parallel, wherein both high-voltage coils 10 are each constructed - likewise designed like a transformer - with a primary winding 11 and a secondary winding 12. The secondary windings 12 of the two coil components 10 are only partially recognizable in the exemplary representations here, further inside the coil, whereas the high-voltage side primary windings 11 are located further out.

[0035] All or individual coil windings can be insulated from each other or in individual layers, for example, with oil-paper insulation.

[0036] The windings of the high-voltage coils 10, in particular their primary windings 11, are further arranged in a plate-like or torus-like configuration around the magnetic core 21. This magnetic core 21 can preferably be prefabricated for AC applications or mains operation during the manufacture of the coil arrangement, in particular from layered or pressed iron sheets. The winding of the coil(s) is then preferably first carried out on a carrier tube, and only then is the core closed and completed for the magnetic field connection.

[0037] Preferably, the similar high-voltage coils 10 are identically designed.

[0038] It is also evident in Figure 2 that the two identical high-voltage coils 10 are arranged symmetrically on the magnetic core 21. Furthermore, the high-voltage coils 10 are arranged one above the other in parallel in the superordinate component of the power-voltage converter 100. For this purpose, an electrical connection or feedthrough 13 between the two individual coil arrangements is also shown in Figure 2.

[0039] Figure 2 also shows that the two identical high-voltage coils 10 are arranged on or wound around opposite limbs of the common magnetic core 21 of the coil arrangement 20. Reference numeral 101 indicates a (main) insulating medium 101 within a housing or tank (not further identified) of the power-voltage converter 100, which may be gaseous, preferably synthetic or purified air.

[0040] Unlike what is shown in the figures, the present invention understandably also encompasses a corresponding triple, quadruple or multiple arrangement of similar high-voltage coils, which can be configured, wound or connected analogously to the two similar high-voltage coils described and accordingly provide the advantages of the invention. In other words, according to the invention, more than two, i.e., for example, three, four or even more similar high-voltage coils 10 - connected in parallel - can be wound or arranged around the described magnetic core 21.

[0041] In the inventive arrangement of individual, identical high-voltage coil arrangements of a specific design connected in parallel one above the other, a compact design of the voltage converter is achieved in particular. First and foremost, however, the design also ensures that the total power or the total output current of the power voltage converter can be advantageously increased, or in particular doubled. In particular, this technical advantage is achieved with a core cross-section that is the same - for example in comparison with a component shown in Figure 1 - without any further design of the components or the adaptation or optimization of further parameters being necessary.

[0042] Typically, the high voltage of the voltage converter for power supply devices is tapped via a high-voltage connection, in particular an aluminum tube 2. Furthermore, as can be seen in Figure 2, the component expediently has insulation 1 surrounding the voltage connection 2. The power voltage converter 100 is shown here only in outline or schematically indicated. However, it is evident that the coil concept according to the invention can basically be used for any type of inductive voltage converter, since it can be applied in a correspondingly scalable manner. Thus, 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 parallel-connected high-voltage coils (10) of the same type, wherein both high-voltage coils are each 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 identically designed.

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 iron sheet or 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 arranged 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 power 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 circuit.

9. Power voltage converter (100) according to claim 8, wherein the two similar high-voltage coils (10) are arranged one above the other according to 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 for increasing the total current and / or the total power of a power voltage converter (100).

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