Arrangement for reactive power compensation in a transformer
The transformer arrangement generates compensation current via electromagnetic processes, addressing the need for stable reactive power compensation in AC networks without active control devices, reducing design complexity and ensuring operational reliability.
Patent Information
- Application Number
- DE202026000480
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2026-02-03
- Publication Date
- 2026-04-30
- Estimated Expiration
- 2036-02-29
AI Technical Summary
Existing reactive power compensation methods in AC electrical networks require additional electrical connections and active control devices, increasing design complexity and potentially impairing operational reliability.
A transformer arrangement with a compensation winding and capacitive element forming a self-contained circuit, generating compensation current through electromagnetic processes, eliminating the need for active control devices and reducing reactive power without additional connections.
Stable reactive power compensation across varying load conditions, achieved through passive magnetic coupling and electromagnetic processes, minimizing design effort and maintaining operational reliability.
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Abstract
Description
2. Summary
[0001] The invention relates to a transformer arrangement for reactive power compensation in AC electrical networks.
[0002] The transformer assembly comprises a magnetic core, at least one primary winding, at least one secondary winding, and at least one compensation winding arranged on the magnetic core. The compensation winding is not intended for supplying an external electrical load and, together with at least one capacitive element, forms a self-contained compensation circuit.
[0003] The compensation winding is magnetically coupled to a transformer winding whose reactive current component is to be compensated. The compensation current generated in the compensation circuit is caused exclusively by electromagnetic processes in the magnetic circuit of the transformer.
[0004] This achieves a reduction in reactive power in the electrical network without the use of active control or regulation devices. 3. Description 3.1 Technical Area
[0005] The invention relates to the field of electrical engineering and to transformer arrangements for operation in alternating current electrical networks with integrated means for reactive power compensation. 3.2 State of the art
[0006] Devices are known for reactive power compensation in which capacitors or capacitor banks are directly connected to electrical networks or to the terminals of transformers. Solutions are also known in which compensation elements are switched on in a controllable or stepwise manner using active electronic, electrical, or electromechanical control means.
[0007] A disadvantage of these solutions is the additional electrical connection of the compensation elements to the transformer connections, as well as the use of switching and control devices, which increases the design effort and can impair operational reliability.
[0008] Furthermore, transformers with additional auxiliary windings are known. However, such windings are not designed as self-contained compensation circuits with capacitive elements and do not serve to generate a compensation current through electromagnetic processes in the magnetic circuit of the transformer for the targeted influencing of the reactive current component of a transformer winding. 3.3 Object of the invention
[0009] The invention is based on the objective of providing a transformer arrangement that enables effective reactive power compensation without the use of active control or regulation devices and can be implemented with minimal design effort. 3.4 Solution to the task
[0010] This problem is solved by a transformer arrangement having the features of claim 1.
[0011] The transformer arrangement comprises a magnetic core, at least one primary winding and at least one secondary winding of the transformer, and at least one compensation winding arranged on the magnetic core.
[0012] The compensation winding is not intended to supply an external electrical load and, together with at least one capacitive element, forms a self-contained compensation circuit.
[0013] The compensation winding is magnetically coupled to a transformer winding whose reactive current component is to be compensated. The compensation current in the self-contained compensation circuit is generated exclusively by electromagnetic processes in the magnetic circuit of the transformer.
[0014] This design generates a compensation current that is suitable to effectively reduce the reactive current component of the coupled transformer winding in the operating range of the transformer, without the need for active control or regulating means.
[0015] Due to the magnetic coupling and the passive nature of the compensation circuit, the compensation effect is only slightly dependent on load changes of the main windings, thus achieving stable reactive power compensation across different operating conditions.
[0016] The electrical parameters of the compensation winding and the capacitive element are dimensioned such that the current flowing in the compensation circuit has a technically relevant influence on the reactive current component of the respective transformer winding. 3.5 Explanation of terms
[0017] For the purposes of this application, a compensation current that reduces the reactive power component of a transformer winding is understood to be a current that contributes to compensating a significant portion of the reactive power of this winding and measurably influences the operating state of the transformer.
[0018] This explanation serves to improve understanding of the invention and does not constitute a limitation of the scope of protection. 3.6 Examples of Implementation
[0019] The transformer arrangement can be designed as a single-phase or multi-phase arrangement, in particular as a three-phase transformer.
[0020] The number of compensation windings can correspond to the number of phases. A separate, self-contained compensation circuit can be provided for each phase.
[0021] The parameters of the compensation winding and the capacitive element are chosen so that an effective compensation current is generated throughout the entire intended operating range. 3.7 Description of the drawing In Fig. Figure 1 shows a schematic representation of an embodiment of the transformer arrangement according to the invention.
[0022] The arrangement comprises three elongated elements A, B, and C, which are parallel to each other and essentially vertically aligned. Each element has a straight section as well as a spiral section in its upper area.
[0023] Element B is positioned between elements A and C. A ring-shaped area around element B is shown with a dashed line, marking a functionally defined area for generating the compensation effect.
[0024] Elements A and C are identical and arranged symmetrically on both sides of element B.
[0025] A lower line schematically marks a reference or base plane.
[0026] The drawing serves solely as a schematic representation and does not limit the scope of protection. Dimensions, proportions, and electrical parameters are not shown to scale. List of reference symbols: A First winding B Second winding with associated compensation winding C Third winding || Capacitive element (capacitor) Dashed circle: compensation circle.
Claims
[1] Transformer arrangement for reactive power compensation in an AC electrical network, comprehensive - a magnetic core, - at least one primary winding and at least one secondary winding of the transformer, characterized by , that at least one compensation winding is arranged on the magnetic core, which is not intended to supply an external electrical load, wherein the compensation winding together with at least one capacitive element forms a self-sufficient compensation circuit, and wherein the compensation winding is magnetically coupled to a transformer winding whose reactive power component is to be compensated, wherein the compensation current flowing in the compensation circuit is generated by electromagnetic processes in the magnetic circuit of the transformer. [2] Transformer arrangement according to claim 1, characterized bythat the transformer arrangement is designed as a multi-phase arrangement, in particular as a three-phase transformer. [3] Transformer arrangement according to claim 1 or 2, characterized by that the compensation winding and the capacitive element are dimensioned such that the generated compensation current is suitable to effectively reduce the reactive current component of the coupled transformer winding in the operating range of the transformer. [4] Transformer arrangement according to any one of claims 1 to 3, characterized by that the electrical parameters of the capacitive element remain unchanged during the operation of the transformer arrangement.