Method for monitoring an electrical device and monitoring device

Description

1 / 15 METHOD FOR MONITORING AN ELECTRICAL DEVICE AND MONITORING DEVICE TECHNICAL FIELD

[0001] Method for monitoring an electrical device comprising at least one short-circuit winding coil, monitoring device, use and arrangement.

[0002] The present invention relates to a method for monitoring an electrical device comprising at least one coil, in particular a reactor, preferably an air-core reactor, or a transformer, for winding short circuits. Furthermore, the invention relates to a monitoring device, to the use of such, and to an arrangement comprising an electrical device with at least one coil, in particular a reactor, preferably an air reactor, or a transformer, and at least one monitoring device. RELATED ART

[0003] Winding short circuits can occur in electrical devices with at least one coil, such as electrical reactors, for example air-core reactors or oil- or gas-insulated reactors, transformers, or similar devices. A winding short circuit is a short circuit between the windings (turns) of a coil (also referred to as a turn-to-turn winding fault). The coil winding(s) are usually separated by insulation. However, the insulation can be damaged, and short circuits between windings can, for example, occur as a result of the damage.

[0004] A high risk is associated with winding short circuits. If they occur, they can lead to latent fires in the insulation and affected electrical devices, such as air-core reactors, which may partially or completely burn out. Such fires represent a high risk of destruction as well as a high risk of injury to people who may be present in the vicinity. They also represent an environmental risk.

[0005] If a visual inspection of electrical devices, in particular Petition 870250085597, dated 09 / 22 / 2025, pp. 73 / 93 If 2 / 15 of its coil(s) or insulation is performed, it is generally not easy to detect faults or incipient faults, or they can only be detected at a fairly late stage, that is, when slow combustion or fire has already occurred, accompanied by the development of smoke. SUMMARY OF THE INVENTION

[0006] It is therefore an objective of the present invention to provide a method and a device that allow for reliable and early detection of winding short circuits.

[0007] This objective is solved by a method for monitoring an electrical device comprising at least one coil, in particular a reactor, preferably an air-core reactor, or a transformer, for winding short circuits, in which - During the operation of the electrical device, a magnetic field generated by at least one coil is continuously or at predetermined times measured with a magnetic field sensor. - it is determined whether a magnetic field anomaly, in particular an abnormal field intensity, is present, and a comparison is made between at least one value measured with the magnetic field sensor and / or at least one value deduced from it with at least one reference value, and The presence of a magnetic field anomaly is used to identify an imminent or occurred winding short circuit.

[0008] Furthermore, the objective is solved by a monitoring device for monitoring an electrical device comprising at least one coil, in particular a reactor, preferably an air-core reactor, or a transformer, for winding short circuits, comprising - a magnetic field measuring unit comprising or consisting of at least one magnetic field sensor, in particular at least one preferably linear Hall sensor, - a processing unit being connected to the unit of Petition 870250085597, dated 09 / 22 / 2025, pp. 74 / 93 3 / 15 measuring magnetic field and being able to receive and process data that was acquired with the magnetic field measurement unit, - a data transfer unit being connected to the processing unit and configured to transmit data wirelessly, - a power supply unit for providing electrical power to the magnetic field measurement unit, the processing unit, and the data transfer unit.

[0009] The monitoring device according to the invention has proven to be particularly suitable for carrying out the method according to the invention. Also, the inventive monitoring device requires comparatively few components and can be manufactured easily and economically.

[0010] Conveniently, the processing unit is configured and / or set up to determine whether an anomaly is present in a magnetic field measured with the magnetic field measuring unit by comparing at least one value measured with the magnetic field sensor and / or at least one value deduced from the same with at least one reference value preferably stored in the processing unit.

[0011] The basic idea of ​​the present invention, in other words, is to measure the magnetic field of at least one coil of the electrical device and detect anomalies. Due to the monitoring of the magnetic field, very high sensitivity is obtained and winding short circuits can be detected quite reliably even at an early stage of fault development. Preventive detection before the occurrence of major damage, such as latent fires or similar, becomes possible.

[0012] At the same time, it is not necessary to compromise the insulation of the coil(s) to carry out the inventive method for monitoring an electrical device for winding short circuits, preferably using the inventive monitoring device. The magnetic field sensor or monitoring device only needs to be positioned in such a way that the measurement of Petition 870250085597, dated 09 / 22 / 2025, pp. 75 / 93 4 / 15 field of the coil(s) is possible.

[0013] If a magnetic field anomaly is detected, at least one signal, in particular a warning signal, may be emitted or transmitted, preferably wirelessly. The inventive monitoring device may be configured and / or set up accordingly. The receiver of such a signal may be a ground station preferably located at a distance from the electrical device. Such a ground station may be an IoT device.

[0014] A magnetic field anomaly due to which a winding short circuit is detected within the scope of the inventive monitoring method and / or with the inventive monitoring device may, for example, be an abnormal field strength. High-frequency changes (in particular more than 1 kHz, preferably a few kHz) in magnetic field strength may also be detected or interpreted as anomalies.

[0015] Alternatively or additionally, magnetic field values ​​above normal load conditions, for example caused by fault currents, may be detected or interpreted as magnetic field anomalies.

[0016] Also, deviations between load currents of at least one coil and values ​​measured with the magnetic field sensor and / or values ​​deduced from them can be determined. In this case, it is even preferred that deviations of more than one predetermined value be interpreted as magnetic field anomalies.

[0017] In the preferred embodiment, the monitoring system according to the invention is configured and / or set up to recognize / detect a magnetic field anomaly and therefore a winding fault in one or more of the cases mentioned above.

[0018] To determine if an anomaly is present, a comparison is made between at least one value measured with the magnetic field sensor (and / or at least one value deduced from the at least one measured value) and at least one reference value. The at least one reference value Petition 870250085597, dated 09 / 22 / 2025, pp. 76 / 93 5 / 15 could, for example, be a value that was previously measured under known conditions without any winding faults, for example in the electrical device to be monitored or in another, suitably identical or at least similarly constructed electrical device. In other words, a reference measurement is or was taken. One or more reference values ​​may be or have been recorded, for example, immediately after commissioning the electrical device to be monitored or an identical or similar electrical device, when the insulation between the coil winding(s) is or was expected to be in perfect condition.

[0019] Only one reference value or several reference values ​​may be used. A number of reference values ​​may, for example, be given by several reference values ​​recorded one after the other over time. It may be a sequence of measured values ​​recorded over a certain period of time, for example after commissioning. For example, the time course of the magnetic field without winding faults may be recorded and the corresponding measurement may be used as a reference for comparison to determine anomalies and therefore winding short circuits.

[0020] At least one reference value can also be given by a particular so-called fingerprint of the magnetic field.

[0021] It is also possible to use at least one value deduced from at least one value measured with the magnetic field sensor for comparison purposes. A deduced value may, for example, be obtained or have been obtained by further processing of the measured value(s). In other words, the comparison should not be based (directly) on the data obtained from the magnetic field sensor, but values ​​derived from them may also be considered.

[0022] In a particularly preferred embodiment, a magnetic field sensor is used that can measure static magnetic fields, or in other words, DC magnetic fields. The at least one magnetic field sensor of the inventive monitoring device may accordingly be Petition 870250085597, dated 09 / 22 / 2025, pp. 77 / 93 6 / 15 configured to measure static magnetic fields. In particular, a magnetic field sensor is used which comprises or consists of at least one preferably linear Hall sensor.

[0023] A Hall sensor should be understood in particular as a sensor or element that uses the Hall effect for magnetic field detection. Hall sensors are sometimes also referred to as Hall effect sensors and are conveniently semiconductor components.

[0024] The method according to the invention may further comprise that the magnetic field sensor is disposed in the electrical device. In particular, it may be disposed in a front end region or side face and / or within the coil or at least one coil. The magnetic field sensor may be fixed to a support arrangement for the coil or at least one coil, in particular to a support star for the coil or at least one coil, which has been found to be particularly suitable.

[0025] If a monitoring device according to the invention is used, it can be arranged in a corresponding position on the electrical device. In an advantageous embodiment, the monitoring device according to the invention has fastening means for attaching it to an electrical device, in particular to a support arrangement of at least one coil of an electrical device.

[0026] The electrical device that is monitored using the method according to the invention and / or by means of the monitoring device according to the invention may be, for example, an air-core reactor. Then, the magnetic field sensor or monitoring device is preferably disposed in the area of ​​the air core and / or at or near, in particular, the upper end of at least one coil of the air-core reactor. Air-core reactors are generally used to compensate for capacitive reactive power and are also referred to as air-core shunt reactors.

[0027] Although the monitoring method and device according to the present invention have proven to be particularly suitable for Petition 870250085597, dated 09 / 22 / 2025, pp. 78 / 93 7 / 15 Monitoring air-core reactors for winding faults can, of course, also be used to reliably monitor other electrical devices for winding faults in their coil(s). Oil- or gas-insulated reactors or oil- or gas-insulated transformers can be mentioned as examples in this regard.

[0028] The electrical device to be monitored may comprise only one or more coils and only one or more coils of an electrical device may be monitored for winding short circuits. An air-core reactor, for example, may comprise a coil array with two or more coils that are preferably hollow cylindrical and arranged coaxially.

[0029] In a preferred embodiment, the monitoring device according to the invention has signal processing properties. In particular, the processing unit is provided to be configured and / or set up to pre-process or further process measured values ​​or measured data acquired by means of at least one magnetic field sensor.

[0030] The processing unit may comprise or consist of at least one microcontroller or at least one microcontroller-based sensor node.

[0031] The processing unit can be configured and / or set up to subject the measured values ​​or measured data acquired with at least one magnetic field sensor to a Fourier transform, in particular a fast Fourier transform (FFT) and / or at least one filtering process.

[0032] A further embodiment of the monitoring device according to the invention is characterized by the fact that the power supply unit is configured in such a way that it can supply electrical power to power the magnetic field measuring unit and the processing unit and the data transfer unit when exposed to at least one magnetic field. In other words, the electrical power to power Petition 870250085597, dated 09 / 22 / 2025, pp. 79 / 93 8 / 15 The components or units of the monitoring device according to the invention can be supplied via the magnetic field or obtained from the magnetic field, which is measured with at least one magnetic field sensor to detect winding faults. A separate power source or a wired connection for power supply is not required then. The monitoring device according to the invention is self-sufficient in energy in this case.

[0033] For example, the power supply unit may comprise or consist of at least one energy harvester. Energy harvesting in particular means extracting small amounts of electrical energy from the environment, for example ambient temperature, vibrations, air movements or the like. Energy harvesting offers the advantage of not needing a wired or battery-powered power supply.

[0034] Magnetic fields can also be used for energy harvesting, which is the case in a preferred embodiment of the invention. At least one energy harvester can be configured to provide an electrical voltage when exposed to a magnetic field. Energy self-sufficiency is provided by at least one energy harvester and the magnetic field to be monitored in this case.

[0035] Another embodiment is characterized by the fact that the monitoring device comprises a box and the magnetic field measuring unit, the processing unit, the data transfer unit and the power supply unit are arranged inside the box. The four units preferably extend completely inside the box. In a further preferred embodiment, the four units are encapsulated by the box.

[0036] The invention also relates to the use of an inventive monitoring device for monitoring an electrical device comprising at least one coil, in particular a reactor, preferably an air-core reactor, or a transformer, for winding short circuits.

[0037] In addition, the invention relates to an arrangement Petition 870250085597, dated 09 / 22 / 2025, pages 80 / 93 9 / 15 comprising an electrical device with at least one coil, in particular a reactor, preferably an air-core reactor, or a transformer, and at least one monitoring device according to the invention. The monitoring device may be attached to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] With regard to the embodiment of the invention, reference is also made to the dependent claims and to the following description of an embodiment with reference to the accompanying drawing. The drawing shows the following:

[0039] Figure 1 is a purely schematic perspective view of an arrangement comprising an electrical device, namely an air-core reactor, and an embodiment of a monitoring device according to the invention being attached thereto; Figure 2 is a purely schematic view showing the windings of a coil and a winding fault; Figure 3 is a purely schematic, enlarged representation of the monitoring device in Figure 2. DETAILED DESCRIPTION OF THE INVENTION

[0040] Figure 1 shows a schematic perspective view of one embodiment of an arrangement 1 according to the invention comprising an electrical device 2 with at least one coil 3 and a monitoring device 4 attached to the electrical device 2.

[0041] The electrical device is configured as an air-core reactor 2. This should be understood as exemplary. Additional examples for electrical devices with at least one coil 3 are oil- or gas-insulated reactors or transformers, which may also be oil- or gas-insulated.

[0042] The air-core reactor 2 comprises several, for example, three coils 3, namely, an inner coil, an outer coil, and a middle coil 3 extending between the inner and outer coils 3. Each coil 3 is hollow cylindrical and the coils are arranged coaxially. The coils 3 form a coil arrangement that is itself hollow cylindrical in shape. The central axis is oriented Petition 870250085597, dated 09 / 22 / 2025, pp. 81 / 93 10 / 15 vertically. It is emphasized that the number of three coils 3 should be understood purely as exemplary and that the air-core reactor 2 - or other electrical device - may also comprise only one or two or more of three coils 3.

[0043] Inside the array of hollow cylindrical coils there is air. It can also be said that the air-core reactor 2 comprises an air core L.

[0044] The air-core reactor 2 further comprises two support arrangements for the coils 3, namely an upper and lower support star 5. The monitoring device 4 is fixed to the upper support star 5, thus being positioned at a point above the air core L on the support star 5. Four elongated legs 6 project from the lower support star 5, through which the electrical device 2 is supported and insulated against the ground.

[0045] Each of the coils 3 comprises several windings 7 in a manner known per se. Figure 2 shows – purely schematically – a cross-sectional view through a coil 3 with windings 7. The windings 7 are separated from each other by an insulating material, in other words an insulation (not shown in the highly simplified Figure 2). The insulation can be damaged so that winding short circuits, in particular short circuits between adjacent windings 7, can occur. Such a winding short circuit 8 is schematically indicated in Figure 2 by a closed circle with a thicker line – here between the two inner windings 7.

[0046] A high risk is associated with turn-to-turn winding faults 8. If they occur, they can for example lead to latent fires in the insulation, so that the air-core reactor 2 can catch fire and burn.

[0047] Monitoring device 4 can be used to detect winding short circuits 8 as early as possible.

[0048] As shown in the enlarged view of Figure 3, the monitoring device 4 comprises a magnetic field measuring unit 9, which comprises or consists of at least one magnetic field sensor. In Petition 870250085597, dated 09 / 22 / 2025, pages 82 / 93 11 / 15 example shown, the magnetic field measurement unit consists of a linear Hall sensor 9. The Hall sensor 9 is a semiconductor device that can be used to measure magnetic fields, including DC magnetic fields, using the Hall effect.

[0049] The monitoring device 4 and therefore the Hall sensor 9 included is, as mentioned above, fixed to the upper support star 5 above the air core L so that the Hall sensor 9 is exposed to the magnetic field generated by the coils 3 of the air core reactor 2 during operation and can measure the magnetic field. For example, the Melexis model MLX91207 can be used as a Hall sensor.

[0050] The monitoring device 4 also comprises a processing unit 10 being connected to the magnetic field measurement unit 9 and being able to receive and process data that were acquired with the magnetic field measurement unit 9. Here the processing unit 10 consists of a microcontroller or a microcontroller-based sensor node, in particular consisting of a microcontroller and sensors on an SPI bus or I2C bus or other suitable bus.

[0051] The monitoring device 4 further comprises a data transfer unit 11 connected to the processing unit 10 and configured to transmit data wirelessly. Although in Figure 3 the data transfer unit 11 is shown as being part of the processing unit 10, this should be understood purely as an example. The data transfer unit 11 can in principle also be configured separately from the processing unit 10.

[0052] The monitoring device 4 also comprises a power supply unit 12 for supplying electricity to the magnetic field measurement unit 9, the processing unit 10 and the data transfer unit 11. In the example shown, the power supply unit 12 comprises or consists of a power collector so that the monitoring device 4 is self-sufficient in energy and does not require Petition 870250085597, dated 09 / 22 / 2025, pages 83 / 93 12 / 15 Power supply with cables. The energy collector 12 is configured and / or set up in such a way that it obtains / extracts the electrical energy necessary to power said units 9, 10, 11 from the magnetic field that is generated by the coils 3 during the operation of the air-core reactor 2. In other words, the self-supply of energy for the monitoring device 4 comes from the magnetic field. The energy collector 12 is conveniently configured and / or set up to supply an electrical voltage when exposed to a magnetic field.

[0053] The magnetic field sensor 9, the processing unit 10, the data transfer unit 11 and the power supply unit 12 are arranged in a common box 13 of the monitoring device 4, which protects them from environmental influences. The box 13 can be completely closed, since neither data transmission nor power supply ports are required.

[0054] The monitoring device 4 can be used to perform an exemplary embodiment of the method according to the invention as described below.

[0055] During the operation of electrical device 2, the magnetic field generated by coils 3 is measured continuously or at predetermined times with magnetic field measuring unit 9.

[0056] Purely by way of example, a measured value can be recorded every second or every few seconds, say every two or three or more seconds.

[0057] The measured values ​​are used to determine if a magnetic field anomaly is present.

[0058] A comparison is made between at least one measured value with the magnetic field sensor 9 and / or at least one value deduced from it with at least one reference value. The processing unit 10 is configured and / or set up accordingly. The at least one reference value is stored in the processing unit 10. Petition 870250085597, dated 09 / 22 / 2025, pages 84 / 93 13 / 15

[0059] At least one reference value may, for example, be a value that was previously measured under known conditions without any winding faults 8, for example in the electrical device 2 to be monitored or in another, suitably identical or at least similarly constructed electrical device. In other words, a reference measurement is / was performed. One or more reference values ​​may be or have been recorded, for example, immediately after commissioning of the electrical device 2 to be monitored or of an identical or similar electrical device, when the insulation between the windings 7 of the coil(s) 3 is or was expected to be in perfect condition.

[0060] In the example shown, a digital fingerprint of the magnetic field representing normal operation without faults of winding 8 is stored as a reference in the processing unit 10.

[0061] The evaluation preferably consists essentially of a comparison between the measurement data and the reference data or values, in particular digital fingerprint, with regard to the load current, to issue (warning) messages or signals in case of deviations in the correlation. The processing unit 10 can be configured and / or set up accordingly.

[0062] The presence of a magnetic field anomaly is used to identify an imminent or occurred winding 8 short circuit. In other words, a winding 8 short circuit is assumed to be imminent or has occurred when a magnetic field anomaly has been detected.

[0063] A magnetic field anomaly due to which a winding short circuit 8 is detected within the scope of the inventive method and / or with the inventive monitoring device 4 may, for example, be an abnormal field intensity that does not correlate with the current through the coil(s) 3. High-frequency changes (in particular more than 1 kHz, preferably a few kHz) in magnetic field strength may also be detected or interpreted as anomalies. Such a change may be caused, for example, by an intermittent winding short circuit 8. Alternatively or additionally, magnetic field values ​​above normal conditions of Petition 870250085597, dated 09 / 22 / 2025, pages 85 / 93 14 / 15 charge can be interpreted as magnetic field anomalies and used as warnings of system disturbances.

[0064] Due to magnetic field monitoring, very high sensitivity is achieved and short circuits in winding 8 can be detected quite reliably even at an early stage of fault development. Preventive detection before the occurrence of major damage, such as latent fires or similar, becomes possible. As very early (preventive) and particularly reliable detection is possible, the number of faults can be reduced and costs saved. The insulation of coils 3 can be better protected.

[0065] The data transfer unit 11 is configured and / or set up to send a signal, in particular a wireless warning signal, to a ground station located at a distance from the electrical device 2 in the event that a magnetic field anomaly is detected. Such a ground station may be an IoT device (not shown in the figures).

[0066] The ground station can then, for example, send a warning signal or message to a user. Alternatively or additionally, a switching event can be triggered, preferably automatically, if an anomaly is detected. The electrical device can also be disconnected automatically.

[0067] Because the data transmission from the monitoring device to the ground station is wireless, the isolation of coil(s) 3 is not compromised.

[0068] Although the present invention has been described in detail with reference to the preferred embodiment, it should be understood that the present invention is not limited by the examples disclosed, and that numerous additional modifications and variations could be made by a person skilled in the art without departing from the scope of the invention.

[0069] Regardless of the grammatical gender of a particular term, people with male, female, or non-male gender identities are Petition 870250085597, dated 09 / 22 / 2025, pp. 86 / 93 15 / 15 included. Petition 870250085597, dated 09 / 22 / 2025, pp. 87 / 93

Claims

1 / 4 CLAIMS 1. A method for monitoring an electrical device (2), CHARACTERIZED in that it comprises at least one coil (3), in particular a reactor, preferably an air-core reactor, or a transformer, for winding short circuits (8), in which - during the operation of the electrical device (2), a magnetic field generated by at least one coil (3) is continuously or at predetermined times measured with a magnetic field sensor (9), - it is determined whether a magnetic field anomaly, in particular an abnormal field intensity, is present, wherein a comparison of at least one value measured with the magnetic field sensor (9) and / or at least one value deduced from it with at least one reference value is performed, and - the presence of a magnetic field anomaly is used to identify an imminent or occurred winding short circuit (8).

2. Method according to claim 1, CHARACTERIZED in that high-frequency changes in magnetic field strength and / or magnetic field values ​​above normal charging conditions are interpreted as magnetic field anomalies.

3. Method according to claim 1, CHARACTERIZED in that deviations between load currents of at least one coil (3) and values ​​measured with the magnetic field sensor (9) and / or values ​​deduced therefrom are determined, preferably, wherein deviations of more than one predetermined value are interpreted as magnetic field anomalies.

4. Method according to claim 1, CHARACTERIZED in that a magnetic field sensor (9) is used that can measure static magnetic fields, preferably a magnetic field sensor (9) comprising or consisting of at least one preferably linear Hall sensor. Petition 870250085597, dated 22 / 09 / 2025, pp. 88 / 93 2 / 4 5. Method according to claim 1, CHARACTERIZED in that the magnetic field sensor (9) is disposed in the electrical device (2), preferably in a side face region and / or inside the or at least one coil (3), and / or in that the magnetic field sensor (9) is fixed to a support arrangement for the at least one coil (3), in particular in a support star (5) for the at least one coil (3).

6. Method according to claim 5, CHARACTERIZED in that the electrical device (2) is an air-core reactor and the magnetic field sensor (9) is disposed in the area of ​​the air core (L) and / or on or near, in particular, the upper end face of at least one coil (3) of the air-core reactor (2).

7. Monitoring device (4) for monitoring an electrical device (2), CHARACTERIZED in that it comprises at least one coil (3), in particular a reactor, preferably an air-core reactor, or a transformer, for winding short circuits, comprising - a magnetic field measuring unit (9) comprising or consisting of at least one magnetic field sensor, in particular at least one preferably linear Hall sensor, - a processing unit (10) being connected to the magnetic field measuring unit (9) and being capable of receiving and processing data that were acquired with the magnetic field measuring unit (9), - a data transfer unit (11) being connected to the processing unit (10) and being configured to transmit data wirelessly,- a power supply unit (12) for supplying electricity to the magnetic field measuring unit (9) and the processing unit (10) and the data transfer unit (11)., 8. Monitoring device (4) according to claim 7, CHARACTERIZED in that Petition 870250085597, dated 22 / 09 / 2025, page 89 / 93 3 / 4 the processing unit (10) is configured and / or configured to determine whether an anomaly of a magnetic field being measured with the magnetic field sensor (9), in particular an abnormal field intensity, is present, preferably by comparing at least one value measured with the magnetic field sensor (9) and / or at least one value deduced from the same with at least one reference value that is preferably stored in the processing unit (10), in particular, wherein the data transfer unit (11) is configured and / or configured to wirelessly send a signal if a magnetic field anomaly is present.

9. Monitoring device (4) according to claim 7, CHARACTERIZED in that the magnetic field sensor (9) is configured to measure static magnetic fields.

10. Monitoring device (4) according to claim 7, CHARACTERIZED in that the power supply unit (12) is configured in such a way that it can supply electrical power to power the magnetic field measuring unit (9) and the processing unit (10) and the data transfer unit (11) when it is exposed to at least one magnetic field.

11. Monitoring device (4) according to claim 7, CHARACTERIZED in that the power supply unit (12) comprises or consists of at least one energy collector, preferably, wherein the at least one energy collector is configured to supply an electrical voltage when exposed to a magnetic field.

12. Monitoring device (4) according to claim 7, CHARACTERIZED in that the monitoring device (4) comprises a housing (13) and the magnetic field measuring unit (9), the processing unit (10), the data transfer unit (11) and the power supply unit (12) are arranged inside the housing (13).

13. Use of a monitoring device according to claim 7 for monitoring an electrical device (2), CHARACTERIZED Petition 870250085597, dated 22 / 09 / 2025, page 90 / 93 4 / 4 by the fact that it comprises at least one coil (3), in particular a reactor, preferably an air-core reactor, or a transformer, for winding short circuits (8).

14. Arrangement (1), CHARACTERIZED in that it comprises an electrical device (2) comprising at least one coil (3), in particular a reactor, preferably an air-core reactor, or a transformer, and at least one monitoring device (4) according to claim 7. Petition 870250085597, dated 22 / 09 / 2025, pp. 91 / 93

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