Self-powered detection sensor applied to dry-type air-core reactor winding fault detection and dry-type air-core reactor online monitoring system

Abstract

The invention relates to a self-powered detection sensor applied to dry-type air-core reactor winding fault detection and a dry-type air-core reactor online monitoring system. The sensor comprises a first substrate, a first electrode layer, a grid piece, a second electrode layer, a second substrate and a plurality of frictional charge generating elements. The first electrode layer is arranged on the first substrate; the grid piece is arranged on the first electrode layer, and the grid piece is provided with a plurality of cavities; the second electrode layer is arranged on the grid piece; the second substrate is arranged on the second electrode layer; and the plurality of triboelectric charge generating elements are arranged in the plurality of cavities in a one-to-one correspondence manner so as to generate an electric signal between the first electrode layer and the second electrode layer under the condition that the winding of the dry-type air-core reactor breaks down. By adopting the sensor, the fault of the dry-type air-core reactor winding can be monitored on line, and the problem that the state of the reactor in operation cannot be sensed in time in a traditional off-line testing method is solved.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a self-powered detection sensor for dry-type air-core reactor winding fault detection and an online monitoring system for dry-type air-core reactor. Background Art

[0002] Dry-type air-core reactors are widely used in power systems due to their characteristics of reactive power balance, surge suppression, reactive power compensation and harmonic filtering. However, with the large-scale use of dry-type air-core reactors, inter-turn short circuits caused by inter-turn insulation damage have become one of the main faults affecting their safe and stable operation.

[0003] At present, winding fault detection mainly relies on offline testing methods, that is, conducting field tests after the reactor is shut down to determine its winding status. This method is not only difficult to detect potential defects of the reactor in a timely manner, but also the high cost of the required sensors limits its promotion, and it cannot achieve real-time online evaluation of winding faults. Although some online detection technologies have been studied, such as magnetic field detection method and temperature detection method, these methods also face the problem of requiring high-performance sensors in practical applications, resulting in high costs and have not yet been widely promoted.

[0004] Therefore, it is particularly necessary to develop a low-cost and efficient online monitoring device to achieve effective online detection of dry-type air-core reactor winding faults, especially turn-to-turn short circuits. Summary of the invention

[0005] Based on this, it is necessary to provide a self-powered detection sensor for dry-type air-core reactor winding fault detection and a dry-type air-core reactor online monitoring system.

[0006] In a first aspect, the present application provides a self-powered detection sensor for dry-type air-core reactor winding fault detection, comprising:

[0007] a first substrate;

[0008] A first electrode layer is disposed on the first substrate;

[0009] A grid member is disposed on the first electrode layer, and the grid member has a plurality of chambers;

[0010] A second electrode layer is disposed on the grid member;

[0011] A second substrate is disposed on the second electrode layer;

[0012] A plurality of friction charge generating elements are arranged in a plurality of chambers in a one-to-one correspondence, so as to generate an electrical signal between the first electrode layer and the second electrode layer in the event of a dry-type air-core reactor winding failure.

[0013] In one embodiment, the grid element is a circular honeycomb structure.

[0014] In one embodiment, the material of the mesh member is polylactic acid material.

[0015] In one embodiment, it also includes:

[0016] A first buffer layer is disposed between the first substrate and the first electrode layer;

[0017] The second buffer layer is arranged between the second substrate and the second electrode layer.

[0018] In one embodiment, the materials of the first buffer layer and the second buffer layer are both sponge.

[0019] In one embodiment, the first substrate and the second substrate are both made of acrylic, and the first electrode layer and the second electrode layer are both made of copper foil.

[0020] In one embodiment, the plurality of triboelectric charge generating elements are all polytetrafluoroethylene balls.

[0021] In one embodiment, it also includes:

[0022] A first test end is arranged at a side of the first electrode layer;

[0023] The second test end is arranged at the side of the second electrode layer.

[0024] In a second aspect, the present application also provides an online monitoring system for a dry-type air-core reactor, comprising:

[0025] As the self-powered detection sensor in the above-mentioned embodiment;

[0026] A power module connected to the self-powered detection sensor;

[0027] The acquisition and preprocessing module is connected with the self-powered detection sensor;

[0028] A control module is connected to the power module and the acquisition and preprocessing module respectively;

[0029] The communication module is connected to the control module and is also used to connect to an external terminal.

[0030] In a third aspect, the present application also provides a dry-type air-core reactor, comprising:

[0031] Dry type air core reactor body;

[0032] As in the above-mentioned embodiment, the self-powered detection sensor is installed at multiple locations of the dry-type air-core reactor body, including the reactor support and the winding body.

[0033] The self-powered detection sensor for dry-type air-core reactor winding fault detection and the dry-type air-core reactor online monitoring system have at least the following beneficial effects:

[0034] It can utilize the vibration energy generated by the reactor during operation and convert it into an electrical energy signal through friction nano-power generation technology, thereby monitoring the operating status of the reactor. This not only reduces the dependence of traditional wired sensors on external power supplies, but also because of its small size and light weight, it is easy to install in different positions of the reactor, monitor its health status in real time, and detect potential winding faults in time, thereby improving the reliability and maintenance efficiency of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] FIG1 is a schematic diagram of the structure of a self-powered detection sensor used for dry-type air-core reactor winding fault detection in one embodiment;

[0037] FIG2 is a schematic diagram of a power generation process of a self-powered detection sensor in one embodiment;

[0038] FIG3 is a schematic diagram of a simulation of the potential distribution of a self-powered detection sensor in one embodiment;

[0039] FIG4 is a schematic diagram of output voltage test results of a self-powered detection sensor under different amplitudes A in one embodiment;

[0040] FIG5 is a schematic diagram of output voltage test results of a self-powered detection sensor at different vibration frequencies f in one embodiment;

[0041] FIG6 is a schematic diagram of output voltage test results of a self-powered detection sensor under different amplitudes A, different vibration frequencies f and different accelerations a in one embodiment;

[0042] FIG7 is a schematic diagram of the structure of a grid member in one embodiment;

[0043] FIG8 is a schematic structural diagram of an online monitoring system for a dry-type air-core reactor in one embodiment;

[0044] FIG. 9 is a schematic structural diagram of a dry-type air-core reactor in one embodiment. DETAILED DESCRIPTION

[0045] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0047] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers, doping types and / or parts, these elements, components, regions, layers, doping types and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer, doping type or part from another element, component, region, layer, doping type or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer, doping type or part discussed below can be represented as a second element, component, region, layer or part.

[0048] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0049] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0050] Dry-type air-core reactors have the functions of reactive power balance, surge suppression, reactive power compensation, harmonic filtering, etc. in power systems. Due to the oil-free structure, the shortcomings of oil-immersed reactors such as oil leakage and flammability are eliminated, ensuring safe operation. It has the advantages of simple structure, good linearity, light weight, and easy maintenance. It is widely used in the reactor market and accounts for a high proportion. However, with the large-scale application of dry-type air-core reactors in power systems, some operating faults have occurred in the reactors in actual operation, mainly reflected in the damage of the insulation between the winding turns, resulting in turn-to-turn short circuits, which will seriously affect the safe, stable and reliable operation of dry-type air-core reactors. If the winding fault of the reactor cannot be effectively and timely detected and removed in time, it may further induce catastrophic consequences, such as accidents such as reactor fire, resulting in serious damage. Therefore, the detection of winding fault turn-to-turn short circuit faults of dry-type air-core reactors has important scientific significance and engineering value, and can improve the reliability and safety of equipment.

[0051] However, the existing detection of dry-type air-core reactor winding turn-to-turn short circuit faults mainly adopts offline testing methods, which infers the state of the reactor winding by conducting on-site tests on the reactor after shutdown, making it difficult to detect the latent defects of the reactor in time. In addition, most of these technologies require the use of high-cost sensors to collect data, which restricts their effective development.

[0052] The existing dry-type air-core reactor inter-turn short-circuit fault detection methods mainly include offline detection and online monitoring methods, among which the offline detection method is the most widely used. Typical offline detection methods include pulse oscillation wave method, capacitance and inductance measurement method, ground continuity test method, etc., but the above methods all have certain defects, such as the pulse oscillation wave method has general repeatability and high cost; the capacitance and inductance measurement method is greatly affected by external interference and lacks sensitivity; the ground continuity test method is not intuitive enough and lacks applicability; most importantly, the above methods cannot realize the online evaluation of the reactor winding fault, and are often passive detection after the accident, which makes it difficult to timely discover the potential defects of the dry-type air-core reactor. Therefore, the development of a new online monitoring method and device for dry-type reactor winding short-circuit fault is a scientific problem that needs to be solved urgently.

[0053] At present, engineers have studied some online detection technologies for faults such as short circuits between turns of dry-type air-core reactors, but they are basically in the experimental stage and have not been widely promoted and applied, such as magnetic field detection method, temperature detection method, etc. However, in practical applications, most of the above detection methods require excellent performance sensors to effectively detect early defects in the reactor windings, and the high price of sensors affects the practical application of the methods. Therefore, in order to solve the above problems, it is of high practical value to find a low-cost sensor that can effectively detect dry-type air-core reactor winding faults online.

[0054] Based on the above reasons, in an exemplary embodiment, as shown in FIG1 , the present application provides a self-powered detection sensor for dry-type air-core reactor winding fault detection, comprising a first substrate 2, a first electrode layer 4, a mesh member 6, a second electrode layer 8, a second substrate 10, and a plurality of friction charge generating elements 12. The first electrode layer 4 is disposed on the first substrate 2; the mesh member 6 is disposed on the first electrode layer 4, and the mesh member 6 has a plurality of chambers; the second electrode layer 8 is disposed on the mesh member 6; the second substrate 10 is disposed on the second electrode layer 8; and the plurality of friction charge generating elements 12 are disposed one by one in a plurality of chambers, so as to generate an electrical signal between the first electrode layer 4 and the second electrode layer 8 in the event of a dry-type air-core reactor winding fault.

[0055] For example, the structure of the self-powered detection sensor aims to be small in size and light in weight. Figure 1 is a schematic diagram of the structure of the self-powered detection sensor, which can be understood as a friction nanogenerator for collecting vibration energy. The left side of Figure 1 is the overall structure, which is a cylinder as a whole, and the right side of Figure 1 is the layered structure that is split internally. In terms of the selection of friction materials, two materials with large positive and negative intervals in the triboelectric sequence are selected as the friction layer. The first electrode layer 4 and the second electrode layer 8 are sequentially attached to the upper and lower substrates (the first substrate 2 and the second substrate 10) as the upper and lower layers. The middle layer is a grid member 6 with multiple chambers. In each chamber, a friction charge generating element 12 is filled one by one. The friction charge generating element 12 will contact the two electrode layers by bouncing up and down under the action of vibration.

[0056] Among them, FIG2 is a schematic diagram of the power generation process of the self-powered detection sensor. When the friction charge generating element 12 contacts the first electrode layer 4, the first electrode layer 4 is positively charged and the surface of the friction charge generating element 12 is negatively charged (as shown in FIG2 (a)); when the friction charge generating element 12 moves upward from the first electrode layer 4, the charged surface is separated, driving the free electrons to flow from the second electrode layer 8 to the first electrode layer 4 through the external load to balance the local electric field, and an instantaneous current I is generated at this time (as shown in FIG2 (b)); when the friction charge generating element 12 contacts the second electrode layer 8, all the electrons are transferred to the first electrode layer 4, and the second electrode layer 8 is positively charged (as shown in FIG2 (c)); then, when the friction charge generating element 12 moves downward from the second electrode layer 8, the electrons flow from the first electrode layer 4 to the second electrode layer 8, generating a reverse current I (as shown in FIG2 (d)); finally, it returns to the initial state, and a complete cycle ends. The entire power generation process provides alternating current to the external load through the friction charge generating element 12 contacting the first electrode layer 4 and the second electrode layer 8. During the power generation process, part of the charge on the surface of the electrode layer is the charge generated by frictional charging, and the other part is the charge transferred between the two electrode layers during the electrostatic induction process. The intrinsic equations of the self-powered detection sensor are shown in formulas (1) to (3):

[0057] (1)

[0058] (2)

[0059] (3)

[0060] Formula (1-3) is the VQx relationship of the triboelectric nanogenerator (TENG) effect, where Q SC is the transferred charge in the short-circuit state, V OC is the open circuit voltage, V is the total potential difference between the two electrode layers, Q is the transferred charge, C is the capacitance, d0 is the effective dielectric thickness, g is the total air gap thickness between the two parallel electrode layers, x is the distance between the electrode layer and the friction charge generating element 12, ε0 is the dielectric constant in vacuum, σ is the charge density, and S is the area of ​​the electrode layer.

[0061] FIG3 is the potential distribution of the self-powered detection sensor obtained by simulation. It can be seen from the simulation results that when the friction charge generating element 12 of the middle layer moves to the first electrode layer 4 and the second electrode layer 8, the two electrodes reach the highest and lowest potentials respectively, and the friction charge generating element 12 is negatively charged. The simulation results are consistent with the above working principle. FIG4 is the output voltage test results of the self-powered detection sensor at different amplitudes A, FIG5 is the output voltage test results of the self-powered detection sensor at different vibration frequencies f, and FIG6 is the output voltage test results of the self-powered detection sensor at different amplitudes A, different vibration frequencies f and different accelerations a. Among them, the open circuit voltage of the self-powered detection sensor at different amplitudes is shown in FIG4. It can be seen from the experimental results that when the amplitude is 1mm, the voltage of the self-powered detection sensor is small and does not exceed 10V; when the amplitude increases to 2mm and 3mm, the voltage increases significantly; when the amplitude reaches 4mm and 5mm, the increment of the voltage value is relatively small. Therefore, within the amplitude range of 5mm, the output voltage of the self-powered detection sensor first increases with the increase of the amplitude, and then tends to be flat. Figure 5 shows the relationship between the vibration frequency and the output voltage of the self-powered detection sensor. When the frequency is 20Hz, the voltage increases significantly to more than 20V; at frequencies of 30Hz and higher, the voltage of the self-powered detection sensor rises slowly and gradually stabilizes at around 50V after 50Hz. The comparison of the output voltage results of the self-powered detection sensor under different amplitudes, frequencies and accelerations is shown in Figure 6. The first three waveform results and the last two waveform results in the figure respectively verify that the influence trend of frequency and amplitude on the output voltage of the self-powered detection sensor is the same as the above analysis. Under the same amplitude and frequency, as the vibration acceleration increases from 2g to 10g, the output of the self-powered detection sensor also increases from 51V to about 83V. The above examples show that the self-powered detection sensor can respond to different amplitudes, frequencies and accelerations of mechanical vibration energy, and has the potential to be applied to the detection of winding faults of dry air-core reactors.

[0062] As can be seen from the above, the self-powered detection sensor of the above structure can be installed in multiple parts of the dry-type air-core reactor, including but not limited to the reactor bracket and the winding body, to collect the vibration energy of the dry-type air-core reactor during operation, and directly convert it into an electric energy signal through the friction nano-electricity effect. The signal is transmitted to the processing module, and the characteristics of the electric energy signal are used to characterize the vibration of the reactor. When the dry-type air-core reactor is in a healthy state, the output waveform of the self-powered sensor based on the friction electric effect is stable and fixed, and can be used as a fingerprint waveform; when the reactor winding has a fault such as a turn-to-turn short circuit, the symmetry of the reactor is destroyed, and its vibration mode changes, so the output waveform of the self-powered sensor changes. By further comparing and analyzing the above waveform and the fingerprint waveform, including time domain waveform comparison, frequency domain feature analysis, etc., it can be judged whether the winding of the dry-type air-core reactor is in a healthy and faulty state.

[0063] The above-mentioned self-powered detection sensor used for dry air-core reactor winding fault detection can utilize the vibration energy generated during the operation of the reactor and convert it into an electrical energy signal through friction nano-power generation technology, thereby monitoring the operating status of the reactor. It not only reduces the dependence of traditional wired sensors on external power supplies, but also because of its small size and light weight, it is easy to install at different positions of the reactor, monitor its health status in real time, and detect potential winding faults in time, thereby improving the reliability and maintenance efficiency of the power system.

[0064] In an exemplary embodiment, the grid member 6 is a circular honeycomb structure.

[0065] For example, as shown in FIG7 , the three-dimensional structure of the middle layer of the self-powered detection sensor is shown, which is specifically a tightly connected circular honeycomb structure. The honeycomb structure has excellent mechanical properties, and the regularly arranged circular honeycombs have good buffering properties and can effectively save space. Among them, the relative density of the circular honeycomb structure satisfies the following formula (4):

[0066] (4)

[0067] Where ρ is the relative density of the circular honeycomb structure, R is the radius of the honeycomb unit, and t is the thickness of the honeycomb unit wall.

[0068] In this embodiment, a grid member 6 with a circular honeycomb structure is used as the middle layer of the self-powered detection sensor, which not only provides excellent mechanical properties and stability, but also gives the sensor good buffering capacity and space utilization due to its regular arrangement characteristics, so that the sensor can effectively convert mechanical energy into electrical energy when vibrated while maintaining the compactness and lightness of the structure, thereby improving the sensitivity and reliability of the sensor in the detection of dry air-core reactor winding faults.

[0069] In an exemplary embodiment, the material of the grid member 6 is polylactic acid material.

[0070] Exemplarily, the mesh member 6 is made of polylactic acid material by 3D printing. The use of polylactic acid material and the manufacture of the mesh member 6 by 3D printing technology have the advantages of being environmentally friendly and degradable. At the same time, the polylactic acid material has good biocompatibility and mechanical strength, and is suitable for making fine and strong structures. 3D printing technology allows rapid prototyping and precise molding of complex geometric shapes, ensuring the consistency and production efficiency of the mesh member 6, making the self-powered detection sensor easy to customize production and maintenance while ensuring performance.

[0071] In an exemplary embodiment, as shown in FIG1 , a first buffer layer 14 and a second buffer layer 16 are further included. The first buffer layer 14 is disposed between the first substrate 2 and the first electrode layer 4 ; the second buffer layer 16 is disposed between the second substrate 10 and the second electrode layer 8 .

[0072] In this embodiment, a buffer layer is provided to enhance the flexibility and elasticity of the entire device, allowing the friction charge generating element 12 to move therein and reduce the direct impact of vibration on other parts of the sensor, while allowing the small ball to effectively contact the electrode layer under vibration conditions, thereby effectively generating charge separation.

[0073] In an exemplary embodiment, the materials of the first buffer layer 14 and the second buffer layer 16 are both sponge.

[0074] In this embodiment, the sponge material has low cost and is easy to process and replace. At the same time, its softness and elasticity help to enhance the durability and stability of the sensor, ensuring that it can reliably monitor the operating status of the dry air-core reactor in various environments. The sponge is selected as the material of the first buffer layer 14 and the second buffer layer 16, which can effectively absorb vibration and impact, provide a good shock absorption effect, and protect the core components of the self-powered detection sensor from damage.

[0075] In an exemplary embodiment, the materials of the first substrate 2 and the second substrate 10 are both acrylic, and the materials of the first electrode layer 4 and the second electrode layer 8 are both copper foil.

[0076] In this embodiment, acrylic is selected as the material of the first substrate 2 and the second substrate 10, which can provide good insulation performance and sufficient mechanical support. Acrylic has good transparency and flatness, which is convenient for observation and maintenance. Copper foil is used as the first electrode layer 4 and the second electrode layer 8 because copper has excellent electrical conductivity and ductility, is easy to be processed into a thin film and fits the substrate tightly, ensuring that the sensor can efficiently collect and conduct the charge generated by friction during operation, thereby improving the overall performance and reliability of the sensor.

[0077] In an exemplary embodiment, the plurality of triboelectric charge generating elements 12 are all polytetrafluoroethylene balls.

[0078] In this embodiment, the polytetrafluoroethylene (PTFE) balls are not only wear-resistant, but also chemically stable and not easy to react with other materials, which enables them to maintain good performance in long-term use, thereby improving the stability and durability of the self-powered detection sensor. Using polytetrafluoroethylene (PTFE) balls as the friction charge generating element 12 can effectively utilize the excellent friction electrification performance of the PTFE material. When these balls contact and separate from the electrode layer under vibration conditions, they can efficiently generate and transmit charges.

[0079] In an exemplary embodiment, the self-powered detection sensor for dry-type air-core reactor winding fault detection further includes a first test terminal and a second test terminal. The first test terminal is arranged on the side of the first electrode layer 4; the second test terminal is arranged on the side of the second electrode layer 8.

[0080] Exemplarily, as shown in Fig. 1, the side may refer to one side in the thickness direction of the electrode layer. By respectively setting the first test terminal and the second test terminal on the sides of the first electrode layer 4 and the second electrode layer 8, it is convenient to directly obtain the electrical signal generated by the sensor, simplifying the signal acquisition process, and at the same time, such a design is conducive to reducing the loss and interference in the signal transmission path, ensuring the accuracy and real-time nature of the detection data, thereby improving the efficiency and reliability of the dry-type air-core reactor winding fault detection.

[0081] In an exemplary embodiment, as shown in FIG8 , the present application also provides an online monitoring system for dry-type air-core reactors, including a self-powered detection sensor, a power module, a collection and preprocessing module, a control module, and a communication module as in the above-mentioned embodiment. The power module is connected to the self-powered detection sensor; the collection and preprocessing module is connected to the self-powered detection sensor; the control module is connected to the power module and the collection and preprocessing module respectively; the communication module is connected to the control module, and is also used to connect to an external terminal.

[0082] Exemplarily, the self-powered detection sensor is a sensor for sensing the winding status of the dry-type air-core reactor on the one hand, and can also be used as a power source on the other hand. When connected to the power module for regulation, it supplies energy to the subsequent acquisition and preprocessing module, control module, and communication module, etc. When the entire online monitoring system obtains the perception signal through the self-powered detection sensor and detects the winding fault of the dry-type air-core reactor through analysis, it can send alarm information to the external terminal through 5G, Zigbee and other communication modules to inform the operator, thereby realizing online monitoring of the dry-type air-core reactor and effectively preventing the occurrence of serious burning faults of the reactor.

[0083] In this embodiment, by combining the self-powered detection sensor, power module, acquisition and preprocessing module, control module and communication module, the real-time and automatic monitoring of the reactor operation status is realized. The system does not require an external power supply, which reduces the maintenance cost. At the same time, it can efficiently collect, process and transmit data reflecting the health status of the reactor to an external terminal, improve the accuracy and response speed of fault diagnosis, and enhance the stability and safety of the power system.

[0084] In an exemplary embodiment, as shown in Fig. 9, the present application also provides a dry-type air-core reactor, including a dry-type air-core reactor body 900 and a self-powered detection sensor 100 as in the above embodiment. The self-powered detection sensor 100 is installed at multiple locations of the dry-type air-core reactor body 900, including the reactor bracket and the winding body.

[0085] In this embodiment, by installing the self-powered detection sensor 100 at multiple key locations of the dry-type air-core reactor body 900, such as the reactor bracket and the winding body, the operating status of the reactor can be fully monitored. Not only can the self-powered characteristics of the sensor be utilized to reduce the energy consumption and maintenance costs of the system, but potential fault signs of the reactor can also be captured in real time, and timely warnings can be issued, thereby effectively preventing accidents and ensuring the safe and stable operation of the power system.

[0086] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0087] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A self-powered detection sensor for dry-type air-core reactor winding fault detection, characterized in that: include: a first substrate; A first electrode layer, disposed on the first substrate; A mesh member, disposed on the first electrode layer, and having a plurality of chambers; A second electrode layer is disposed on the grid member; A second substrate, disposed on the second electrode layer; A plurality of friction charge generating elements are disposed in the plurality of chambers in a one-to-one correspondence so as to generate an electrical signal between the first electrode layer and the second electrode layer in the event of a winding failure of the dry-type air-core reactor.

2. The self-powered detection sensor for dry-type air-core reactor winding fault detection according to claim 1 is characterized in that: The grid piece is a circular honeycomb structure.

3. The self-powered detection sensor for dry-type air-core reactor winding fault detection according to claim 2, characterized in that: The material of the grid piece is polylactic acid material.

4. The self-powered detection sensor for dry-type air-core reactor winding fault detection according to claim 1, characterized in that: Also includes: A first buffer layer, disposed between the first substrate and the first electrode layer; The second buffer layer is arranged between the second substrate and the second electrode layer.

5. The self-powered detection sensor for dry-type air-core reactor winding fault detection according to claim 4, characterized in that: The first buffer layer and the second buffer layer are both made of sponge.

6. The self-powered detection sensor for dry-type air-core reactor winding fault detection according to claim 1, characterized in that: The first substrate and the second substrate are both made of acrylic, and the first electrode layer and the second electrode layer are both made of copper foil.

7. The self-powered detection sensor for dry-type air-core reactor winding fault detection according to claim 1, characterized in that: The plurality of friction charge generating elements are all polytetrafluoroethylene balls.

8. The self-powered detection sensor for dry-type air-core reactor winding fault detection according to claim 1, characterized in that: Also includes: A first test end is arranged at a side of the first electrode layer; The second test end is arranged at the side of the second electrode layer.

9. An online monitoring system for dry-type air-core reactor, characterized in that: include: A self-powered detection sensor as claimed in any one of claims 1 to 8; A power module connected to the self-powered detection sensor; A collection and preprocessing module connected to the self-powered detection sensor; A control module, connected to the power module and the acquisition and preprocessing module respectively; The communication module is connected to the control module and is also used to connect to an external terminal.

10. A dry-type air-core reactor, characterized in that: include: Dry type air core reactor body; The self-powered detection sensor as described in any one of claims 1 to 8, wherein the self-powered detection sensor is installed at multiple locations of the dry-type air-core reactor body, and the multiple locations include a bracket and a winding body of the dry-type air-core reactor.

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