High voltage transformer and manufacturing method thereof as well as test system and test signal device

Abstract

The invention relates to a high-voltage transformer designed as a toroidal transformer. The high-voltage transformer comprises a magnetizable core (310) and a high-voltage winding (330) and a low-voltage winding (320) surrounding the magnetizable core (310). The high-voltage winding (330) is at least partially implemented as a step-type winding.

Description

Technical Field

[0001] The present invention belongs to the technical field of high voltage measurement, and in particular relates to a high voltage transformer, a method for manufacturing a high voltage transformer, a high voltage test signal device, and a test system for testing a high voltage device by means of a test signal with high voltage. Background Art

[0002] High-voltage devices such as power transformers or switchgear assemblies, in particular gas-insulated switchgear assemblies, are often used in electrical energy supply networks for the conversion and distribution of electrical energy. Other high-voltage devices such as high-voltage transformers or high-current transformers, for example for measuring voltages and currents occurring in power grids, power switches and generators, are also often used in this context. Such high-voltage devices, or other high-voltage devices such as electric (power) motors, are also used in industrial environments, in particular in production.

[0003] It may be necessary to check the functionality and properties of an installation comprising such a high-voltage device in order to commission or repair the device. In this case, for example, the insulation material of a high-voltage device such as a high-voltage current transformer, a high-voltage voltage transformer or a power switch can be checked, for example by measuring the DC voltage impedance. In this case, for example, the loss factor or the capacitance of a high-voltage device such as a power transformer or a rotating machine such as a generator or a motor can also be measured, which can also provide information about the (residual) quality of the insulating material or the insulating liquid. Partial discharge measurements can also be carried out. In particular, in order to be able to carry out measurements that reflect actual operating conditions, high voltage can also be used as a test signal during the measurement. In addition to laboratory measurements or as an alternative to laboratory measurements, field measurements (e.g. measurements outdoors or in an industrial environment) are often carried out for inspection purposes.

[0004] For field use, test devices are known which include a signal generator and a high-voltage transformer, or use an adjustable transformer to convert the grid voltage into a high voltage to generate a test signal with a high voltage (i.e., in particular, a test signal with a high voltage amplitude or a high RMS voltage). Although the operational safety of such a test device may require measures to insulate the high-voltage winding of the high-voltage transformer or the variable transformer (i.e., the winding electrically located on the test signal side) from other parts of the test device that are not on the high-voltage side (in particular, the low-voltage winding), in particular for the purpose of field use, the test device should be lightweight and rugged for easy transportation to the respective place of use. Summary of the invention

[0005] Therefore, a high-power high-voltage transformer with relatively light weight and relatively simple structure is needed, so that the high-voltage transformer is not only low in manufacturing cost, but also suitable for use in a portable test device. In addition, the present invention is also based on the purpose of providing a corresponding test system and a corresponding manufacturing method.

[0006] A first aspect of the invention relates to a high-voltage transformer, which is preferably configured for use in a test system for testing a high-voltage device. The high-voltage transformer is configured as a toroidal transformer and has a magnetizable core, a high-voltage winding and a low-voltage winding. The high-voltage winding and the low-voltage winding are arranged around the magnetizable core in a manner electrically insulated from each other, wherein the high-voltage winding is at least partially implemented as a pilgrim step winding.

[0007] In the context of the present invention, "low voltage winding" and "high voltage winding" are intended to be understood as windings having one or more turns of an electrical conductor around the (partial) circumference of the transformer core of the high voltage transformer, wherein the electrical conductor is mostly enclosed in an insulating layer to prevent short circuits between the turns. This type of winding mainly uses coil wires or coil strands wound around the transformer core in a circumferential direction, so that the current flowing through the electrical conductor induces a magnetic flux in the transformer core, and the proportion of the magnetic flux of each turn is at least substantially added. This type of winding usually extends in the (partial) forward direction of the transformer core. In this case, multiple turns of this type of winding can be arranged in the forward direction or in the direction opposite to the forward direction.

[0008] Depending on the turns ratio, the voltage at the low voltage winding is converted to a high voltage that can be tapped off from the high voltage winding.

[0009] In the context of the present invention, "high voltage" is considered to be a voltage in the range of 1 kV and above, so that the high voltage transformer according to the present invention is configured to generate and provide a corresponding high output voltage.

[0010] According to one embodiment, the high voltage provided by the high-voltage transformer can be used, in particular, as a test voltage for testing the high-voltage device.

[0011] In the context of the present invention, a "high-voltage device" is intended to be understood to mean at least one device - for example as part of a high-voltage device for supplying electricity or as part of an electrically operated production device - which operates with high voltage or high current, controls, converts or measures this high voltage or may be exposed to high voltage for some other reason and therefore must be arranged for safe operation - for example by means of sufficient electrical insulation. In particular, such a high-voltage device may be a power transformer, a (high-voltage) switchgear assembly, a (high-voltage) circuit breaker or a power switch, a rotating machine such as an electric motor or an electric generator that operates with high voltage or generates high voltage, a tap changer for a transformer or an instrument transformer such as a high-voltage transformer or a high-current transformer.

[0012] In the context of the present invention, a "step-through winding" - also called "pilgrim winding" or "inclined layer winding" - is intended to be understood as meaning at least one winding for a transformer having a plurality of layers of turns around a transformer core, wherein each layer extends only along a section along or against a forward direction of the core, and the respective (electrically) subsequent layer extends in the respective opposite direction (i.e. in a direction opposite to the forward direction or in the forward direction) and respectively partially overlaps the preceding layer. Furthermore, the layers extending in the forward direction extend further (at least in general) than the other layers extending in a direction opposite to the forward direction (or respectively vice versa), so that the step-through winding extends along the forward direction of the core (or respectively in a direction opposite to the forward direction) over a larger section (compared to the sections of the individual layers).

[0013] In some embodiments, the entire high-voltage winding can also be implemented as one or exactly one step-by-step winding. In some embodiments, the high-voltage winding can also be implemented as a plurality of step-by-step windings, wherein some or all of the step-by-step windings are adjacent to each other or are adjacent to each other in the forward direction.

[0014] One advantage of a stepped winding can be, in particular, that it can transmit higher frequencies and thus, in particular, can be used with high-voltage transformers for power quality measurement applications - i.e., in particular when testing high-voltage devices, the load and frequency-dependent response characteristics of the high-voltage device can be determined over a larger frequency range.

[0015] Another advantage of the step-type winding is that it can realize multi-layer windings, and therefore in particular a larger number of turns and / or a higher transformation ratio. In addition, compared to multi-layer spiral or wild windings, which extend at least substantially over the entire core in each layer, the adjacent or adjacent turns or layers of turns, respectively, one above the other, have a lower voltage difference, i.e., in particular, the voltage between the (double) layers is lower. This makes it possible to increase the operating safety and / or the robustness and / or reduce the devices required for electrically insulating the individual layers or adjacent turns from each other (e.g., insulating enamels around the wires for the turns or insulating layers between the individual layers), which can, for example, reduce weight or further improve the heat dissipation from the high-voltage winding to the magnetizable core and to the outside, i.e., in particular in the direction of the low-voltage winding and around the high-voltage transformer.

[0016] In the context of the present invention, a "toroidal transformer" has at least one toroidal core comprising a magnetizable material as a transformer core, that is to say, in particular a so-called toroidal core. Such a toroidal core is essentially toroidally closed or almost closed. The toroidal core can preferably have an annular shape, for example in the form of an annular or tubular segment, or more generally, in the form of a circular three-dimensional body with a central hole. In some variants, the toroidal core can be cut outwards from the central hole in a segment, that is, it can have a so-called air gap. In other variants, the toroidal core can be closed around the central hole, in particular along its annular direction, so that, in particular, the magnetic flux can propagate in the magnetizable material along the annular direction without interruption.

[0017] In this advantageous manner, the high voltage winding and / or the low voltage winding can be wound onto the magnetizable core, i.e. the toroidal core, over a large (longitudinal) section in the forward direction. Another advantage of the high voltage transformer having a toroidal core as the magnetizable core / transformer core can be that, in particular during operation, the magnetic field lines extend predominantly within the toroidal core, so that magnetic interference fields can be reduced.

[0018] Another advantage of a toroidal transformer can be, inter alia, that it has a form factor that is easy to integrate into a housing.

[0019] According to some embodiments, the high-voltage transformer has a protective layer, which is arranged between the high-voltage winding and the low-voltage winding. In this case, the protective layer has a conductive layer for shielding the high-voltage winding from the low-voltage winding. In this advantageous manner, crosstalk between the high-voltage winding and the low-voltage winding can be reduced, as a result of which, in particular when the conductive layer is connected to a suitable potential (e.g. a ground connection), shielding of interference that may propagate from the high-voltage side to the low-voltage side or in the opposite direction can be achieved.

[0020] According to some embodiments, the magnetizable core has an insulation layer made of an electrically insulating material for electrically insulating the magnetizable core from the low voltage winding and the high voltage winding.

[0021] According to one embodiment, the high voltage winding is arranged close to the magnetic core or directly on the magnetizable core. In this embodiment, at most insulation is arranged between the core and the high voltage winding. The low voltage winding is preferably arranged around the high voltage winding.

[0022] The advantages of arranging the high-voltage winding around the magnetizable core and the low-voltage winding around the high-voltage winding can be particularly that the number of turns of the high-voltage winding is reduced and a shorter wire length is required for the high-voltage winding, as a result of which in particular losses can be reduced and / or the frequency response can be further improved, in particular for higher frequencies.

[0023] Another advantage of arranging the high-voltage winding around the magnetizable core and the low-voltage winding around the high-voltage winding can be, in particular, that the high-voltage winding is arranged closer to the core, as a result of which any heat that can occur during operation due to losses (e.g. ohmic losses) in the high-voltage winding can be dissipated towards the magnetizable core and the high-voltage winding can thus be (at least temporarily) cooled by heat dissipation towards the magnetizable core, or the temperature of the high-voltage winding can be buffered by the magnetizable core. The increased heat dissipation makes it possible to increase the performance of the high-voltage transformer and / or to reduce its weight, wherein, in particular, the transformation ratio of the high-voltage transformer can be increased and the achievable output voltage and / or the (temporarily) possible maximum electrical output power at the high-voltage winding can be increased.

[0024] According to a preferred embodiment of the invention, the magnetizable core is "floating" and has no electrical contact or connection to the earth or ground. The magnetizable core is electrically isolated from the earth and also from the high voltage winding and the low voltage winding. In this case, the geometry of the high voltage transformer can be chosen so that the maximum voltage that can occur between the high voltage winding and the magnetizable core is only half of the voltage that would occur if the magnetizable core was at ground potential.

[0025] Other aspects of the present invention relate to a method for manufacturing such a high-voltage transformer, a test signal device for a test system for testing a high-voltage device, which comprises a high-voltage transformer according to the above-mentioned embodiment, and a correspondingly configured test system for testing a high-voltage device.

[0026] Further advantages, features and possible applications will emerge from the following detailed description of exemplary embodiments and / or the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Based on advantageous exemplary embodiments, the invention will be explained in more detail below with reference to the accompanying drawings. Identical elements or components of the exemplary embodiments are substantially denoted by the same reference numerals, unless the context otherwise describes or reveals.

[0028] To this end, it is schematically shown in some cases:

[0029] Figure 1 shows a high voltage transformer according to one embodiment;

[0030] Figure 2 Shows Figure 1 Cross section of a high voltage transformer;

[0031] Figure 3 shows a longitudinal section of a high voltage transformer according to another embodiment;

[0032] Figure 4 A test system according to one embodiment is shown; and

[0033] Figure 5 A flow chart of a method for manufacturing a high-voltage transformer according to an embodiment is shown.

[0034] The accompanying drawings are schematic representations of various embodiments and / or exemplary embodiments of the present invention. The elements and / or components shown in the accompanying drawings are not necessarily shown to scale. Instead, the various elements and / or components shown in the accompanying drawings are presented in a manner that enables those skilled in the art to understand their functions and / or purposes.

[0035] The connections and couplings between the functional units and elements shown in the figures can also be implemented as indirect connections or couplings. In particular, the data connection can be in the form of a wired or wireless connection, i.e. in particular a radio connection. For the sake of clarity, certain connections (e.g. connections for power supply, e.g. electrical connections) may also not be shown. DETAILED DESCRIPTION

[0036] Figure 1 A high voltage transformer 300 according to an embodiment of the present invention is schematically shown.

[0037] The high-voltage transformer 300 has a magnetizable core 310, 311, a low-voltage winding 320, a high-voltage winding 330 and a protective layer 340. The low-voltage winding 320 and the high-voltage winding 330 extend along the forward direction 316 of the magnetizable core. The high-voltage winding is arranged at least around a portion of the magnetizable core 310, 311, in particular a length section, and is configured as a stepped winding. In the exemplary embodiment shown, the high-voltage winding 330 is directly located on the magnetizable core 310, 311. The protective layer 340 is arranged around the high-voltage winding 330 and has an insulating material, so that the low-voltage winding 320 arranged on the outer side relative to the high-voltage winding and the protective layer 340 is electrically insulated from the high-voltage winding 330.

[0038] The low voltage winding 320 has a plurality of turns 328. In some advantageous variants, the turns 328 can be wound helically around the magnetizable core 310 in the forward direction 316, and thus also around the portions including the high voltage winding 330 or the protective layer 340. For this purpose, in some variants, an enameled insulated coil wire, in particular made of copper, can be wound helically around the magnetizable core 310.

[0039] In the illustrated embodiment, for simplicity, only windings for a portion of the magnetizable core 310 are shown. The high-voltage transformer 300 is configured as a toroidal transformer, so that the high-voltage winding 330 and the low-voltage winding 320 extend in a toroidal manner along the entire length of the toroidal magnetizable core 310, 311. Alternatively, a plurality of electrically interconnected high-voltage windings 330 and / or a plurality of electrically interconnected low-voltage windings 320 or a plurality of sections of the high-voltage winding 330 and / or a plurality of sections of the low-voltage winding 320 can also be arranged in a spaced-apart manner or one on top of the other along different length sections of the magnetizable core 310, 311, thereby forming a toroidal transformer as a whole.

[0040] The core 310, 311 is annular, closed or nearly closed, wherein, in the latter case, the annular core 310, 311 is interrupted only by an air gap.The annular shape can be toroidal; however, as shown, angular configurations are also possible.

[0041] Figure 2 A cross section through the high voltage transformer 300 is shown to illustrate its structure from the inside, ie from the magnetizable core, to the outside, ie towards the low voltage windings, wherein the cross section is at least substantially perpendicular to the forward direction of the magnetizable core.

[0042] The high voltage winding 330 is arranged concentrically around the magnetizable core 310. Then, the protective layer 340 is arranged concentrically around the high voltage winding 330. Finally, the low voltage winding 320 is arranged concentrically around the protective layer 340. Thus, the high voltage winding 330 is arranged more inwardly and the low voltage winding 320 is arranged more outwardly relative to each other or relative to the protective layer 340. In some advantageous variants, the high voltage winding 330 contacts the magnetizable core or is only separated from the core by an insulating layer ( Figure 2 310 ), which enables improved thermal coupling between the high voltage winding 330 and the magnetizable core 310 , which can improve performance.

[0043] In some advantageous variations, as shown, the protective layer 340 has a first electrically insulating layer 342, a conductive layer 344 and a second electrically insulating layer 346. In this advantageous manner, the high-voltage winding and the low-voltage winding can be shielded from each other by means of the conductive layer 344, and the conductive layer 344 can be electrically insulated from the high-voltage winding by means of the first electrically insulating layer 342, and electrically insulated from the low-voltage winding by means of the second electrically insulating layer 346. In some variations, the first electrically insulating layer 342 can be electroplated, and the conductive layer 344 can be applied thereto in this way. In other variations, the conductive layer 344 can also be applied by vapor deposition (especially as metal vapor) or adhesive bonding (especially as metal foil). In addition, in some variations, the second electrically insulating layer 346 can be omitted.

[0044] Figure 3 A longitudinal section of a high-voltage transformer according to another embodiment of the invention is shown to illustrate an embodiment of a high-voltage winding as a stepped winding, wherein further components such as protective layers, low-voltage windings or magnetic connection elements are not shown, e.g. for reasons of clarity.

[0045] Figure 3 The high voltage transformer shown may correspond to the reference Figure 1 and / or Figure 2 A high-voltage transformer 300 is described, wherein the longitudinal section is at least substantially along a positive direction of the magnetizable core, so that the positive direction 316 lies at least substantially in the cross-sectional plane.

[0046] exist Figure 3 In the diagram, the positive direction 316 is shown by a dashed, bent arrow, wherein the positive direction is to be understood relative to the corresponding position at the magnetizable core 310 and the possible magnetic flux and thus represents a local direction which in particular points locally in the direction of the possible magnetic flux in each case (or always opposite to it). Thus, in the case of a closed magnetizable core, if the positive direction is followed locally in each case, a closed curve is obtained which encloses exactly one area.

[0047] The high voltage winding 330 has a plurality of turns, which are grouped into a plurality of turn groups 335, in each of which the turns are wound electrically in series and spirally around the magnetizable core 310 in the forward direction, and into a plurality of turn groups 336, in each of which the turns are wound electrically in series and spirally around the magnetizable core in the reverse direction to the forward direction. In this case, the groups 335 and 336 are alternately electrically connected in series with each other and are alternately wound around the magnetizable core 310, so that the first number of turns in the forward direction of one of the groups 335 is followed by the second number of turns in the reverse direction of one of the groups 336. In addition, the first number is greater than the second number, so that a winding in the forward direction is obtained as a whole.

[0048] To make the high voltage winding 330, the coil wire can be alternately wound around the core 310 in the forward direction for a first number of turns and in the reverse direction, that is, opposite to the forward direction, for a second number of turns. In some advantageous variants, the coil wire can be an enameled insulated copper wire.

[0049] By winding in the forward direction and in the direction opposite to the forward direction, more turns can be wound around the magnetizable core 310 in its length segment than in the case of spiral winding only in the forward direction or only in the reverse direction. Therefore, a large number of turns can be obtained without the need for another layer of turns extending over all the length segments of the magnetizable core intended to be wound thereon. Since in the step-by-step winding, the winding is carried out in the forward direction and in the reverse direction for a single length segment of the magnetizable core, the length segment locally has a plurality of layers (so to speak), wherein the voltage difference between these "local layers" is smaller than in the case of a multilayer winding, in which the turns are respectively wound over the total length of the magnetizable core to be wound. For example, as Figure 3 As shown, turns 338 of one group in set 336 are spatially adjacent to turns 337 and 339 of one group in set 335 and furthermore only one or only two turns are electrically distant therefrom, with the result that during operation of the high voltage transformer relatively small voltage differences exist between the turns.

[0050] In some variations, the magnetizable core 310 can also have an insulating layer 314. Figure 3 As shown, the insulating layer can be connected to the core and surround only a portion of the core 310, in particular the length to be wound thereon, or surround the entire core 310, thereby electrically insulating it. In some variants, this can be particularly advantageous in combination with a magnetizable core 310 made of laminated steel, in particular multi-layer laminated steel, in particular capable of being wound to form a toroidal core.

[0051] Figure 4A test system 10 according to an embodiment of the invention and a high voltage device 30 to be tested are shown as schematic block diagrams, wherein for a more detailed explanation some components of the test system and associated electrical connections, connection points and / or nodes are schematically depicted as a (basic) circuit diagram.

[0052] In an exemplary embodiment, the test system 10 has a portable main device 100 and a portable high-voltage test signal device 200. In this case, the high-voltage test signal device 200, as a portable auxiliary device of the test system 10, can realize additional (test) functions, especially high-voltage-based functions, in addition to the functions already provided by the portable main device.

[0053] The portable main device 100 has a housing and a power output terminal 120 integrated into the housing. The portable high-voltage test signal device 200 has a housing and a power input terminal 220 integrated into the housing. The power output terminal 120 and the power input terminal 220 are electrically connected by a cable 20 during operation, that is, for testing the high-voltage device 30.

[0054] The portable high-voltage test signal device 200 also has a test signal device 230, the components of which are accommodated in the housing of the high-voltage test signal device 200. In this case, the first test connection 232 and the second test connection 234 of the test signal device 230 can be integrated in the housing of the portable high-voltage test signal device 200 in a manner corresponding to the power supply input 220.

[0055] During operation, that is to say when the high voltage device 30 is tested, the first test connection 232 is electrically connected to the first connection point 32 of the high voltage device 30 and, correspondingly, the second test connection 234 is electrically connected to the second connection point 34 of the high voltage device 30 .

[0056] For grounding, the portable high voltage test signal device 200 can have a ground connection 204, in particular to allow a separate ground connection, for example to increase operational reliability. Alternatively, one of the test connections can also be used as a ground connection at the same time, in particular to allow simpler wiring.

[0057] The test signal device 230 has a high-voltage transformer 300 according to one of the above-described exemplary embodiments, wherein Figure 4, the high-voltage transformer 300 is only schematically shown with a magnetizable core 310, a low-voltage winding 320 and a high-voltage winding 330 and a protective layer 340. The magnetizable core 310 is designed as a toroidal core, in particular, for low interference, a compact design and form factor are provided, so that it can be easily integrated into a housing, thereby providing a high-voltage test signal device 200 that is particularly easy to transport. This compact design is synergistically supported by the high-voltage winding 330, which is preferably close to the core and is therefore thermally buffered, in particular, by means of the magnetizable core 310. As mentioned above, both the low-voltage winding 320 and the high-voltage winding 330 can be formed by a correspondingly appropriate number of partial windings.

[0058] like Figure 4 As shown, the high-voltage winding 330 has a first connection point 332 and a second connection point 334, wherein the second connection point 334 is electrically connected to the second test connection 234. The first connection point 332 can be electrically connected to the first test connection 232, wherein they can be connected to each other directly or as shown by means of an electrical switch 238 of the test signal device 230. The switch 238 enables the first connection point 332 and the first test connection 232 to be selectively electrically connected, so that, for example, an electrical connection for applying a high voltage to the high-voltage device 30 can be established and disconnected for safety reasons between individual test operations.

[0059] The low voltage winding 320 has a first connection point 322 and a second connection point 326. The first connection point 322 and the second connection point 326 are electrically connected to the power input terminal 220, so that a power signal can be applied between the two connection points 322, 326 via the power input terminal 220.

[0060] In order to generate the power supply signal, the portable master device 100 has a power supply signal source 130, in particular a controllable voltage source electrically connected to the power supply output 120. In this case, the portable master device 100 is arranged to control the power supply signal source 130 so that a voltage is applied between the first connection point 322 and the second connection point 326 of the low voltage winding 320 by the power supply signal, and the high voltage transformer 300 converts the voltage into a test signal for testing the high voltage device 30, which is applied between the first connection point 332 and the second connection point 334 of the high voltage winding 330, and therefore also between the first connection 232 and the second test connection 234 when the switch 238 is closed.

[0061] The portable host device 100 is preferably configured to communicate with the user via an integrated controller ( Figure 4 The test process is controlled by a test signal generated by the high voltage transformer 300 (not shown).

[0062] Figure 5A flow chart of a method 800 for manufacturing a high voltage transformer according to an embodiment of the present invention is shown.

[0063] In an exemplary embodiment, method 800 includes method steps 810, 820, 830, and 840. Method 800 starts with method start 802 and ends with method end 804, wherein the method steps are performed in the following order, and some variants of the method (for example, for producing specific embodiments, improvements, variants, or exemplary embodiments according to the description and / or according to the drawings) may have further method steps.

[0064] In method step 810 , a magnetizable core is provided for a high-voltage transformer configured as a toroidal transformer.

[0065] In method step 830 , the coil wire is wound at least partially as a step-by-step winding around the magnetizable core, thereby forming a high-voltage winding of the high-voltage transformer.

[0066] In method step 840 , a protective layer is applied which surrounds the high-voltage winding on a side facing away from the magnetizable core and electrically insulates the high-voltage winding in the direction of this side facing away.

[0067] In method step 820 , a coil is wound around the high voltage winding surrounded by the protective layer to form a low voltage winding of the high voltage transformer having a smaller number of turns than the high voltage winding, and the protective layer electrically insulates the high voltage winding and the low voltage winding from each other.

Claims

1. A high voltage transformer (300), in, The high voltage transformer (300) is designed as a toroidal transformer and comprises: a single magnetizable core (310) which is annularly closed or nearly annularly closed; a low voltage winding (320) disposed around at least a portion of the magnetizable core (310); and a high voltage winding (330) disposed around at least a portion of the magnetizable core (310) and electrically insulated from the low voltage winding (320), wherein the high voltage winding (330) is at least partially implemented as a step-type winding; and The magnetizable core (310) has an insulating layer (314) for electrically insulating the at least a portion of the magnetizable core from the low voltage winding (320) and the high voltage winding (330), The high-voltage winding (330) has a plurality of turns, the plurality of turns being divided into a plurality of first turn groups (335) and a plurality of second turn groups (336), in each of the plurality of first turn groups (335), the turns are electrically wound in series and spirally around the magnetizable core (310) in a forward direction, and in each of the plurality of second turn groups (336), the turns are electrically wound in series and spirally around the magnetizable core (310) in a reverse direction to the forward direction; the plurality of first turn groups (335) and the plurality of second turn groups (336) are alternately electrically connected in series with each other and alternately wound around the magnetizable core (310), so that a first number of turns of one of the plurality of first turn groups (335) in a forward direction is followed by a second number of turns of one of the plurality of second turn groups (336) in a reverse direction, wherein the first number is greater than the second number.

2. The high voltage transformer (300) according to claim 1, wherein: The high voltage winding (330) is arranged directly around the magnetizable core (310).

3. The high voltage transformer (300) according to claim 1, wherein: The low voltage winding (320) is arranged around the high voltage winding (330).

4. The high voltage transformer (300) according to claim 1, wherein: The high voltage winding (330) extends around the magnetizable core (310) and has at most one circuit in a forward direction (316), and wherein the forward direction is locally along a corresponding direction of the magnetizable core (310).

5. The high-voltage transformer (300) according to claim 1 further comprises a protective layer (340), wherein the protective layer is arranged between the high-voltage winding (330) and the low-voltage winding (320), wherein: The protective layer (340) is configured such that it electrically insulates the high voltage winding (330) and the low voltage winding (320) from each other.

6. The high voltage transformer (300) according to claim 5, wherein: The protective layer (340) has a conductive layer (344) for shielding the high-voltage winding (330) from the low-voltage winding (320).

7. The high voltage transformer (300) according to claim 1, wherein: The magnetizable core (310) has no electrical ground connection.

8. The high voltage transformer (300) according to claim 1, wherein: The high voltage transformer is configured to generate a high voltage test signal for a test system (10) for testing a high voltage device (30).

9. A test signal device (230) of a test system (10) for testing a high voltage device (30), comprising: The high voltage transformer (300) as claimed in claim 1; in, The test signal device (230) is configured to generate a test signal by means of the high-voltage transformer (300) and provide the test signal to test the high-voltage device (30), wherein the test signal is applied between a first connection point (332) and a second connection point (334) of a high-voltage winding (330) of the high-voltage transformer (300).

10. A test system (10) for testing a high voltage device (30), comprising A portable main device (100) having a housing and a portable auxiliary device (200) having a separate housing, the auxiliary device being electrically connectable to the main device; in, The portable auxiliary device (200) is designed as a portable high-voltage test signal device (200) and has a test signal device (230) as claimed in claim 9; and The portable main device (100) is configured to control the generation of a test signal through a high-voltage transformer (300) of a portable auxiliary device (200) for testing a high-voltage device (30).

11. A method for manufacturing the high voltage transformer (300) according to claim 1.

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