Insulator detection device based on induction array, detection equipment and detection method
By comparing the electrical signals of insulators through multi-point synchronous induction, an electric field curve is generated, which solves the problems of vibration interference and low positioning accuracy in the single-point scanning detection scheme, and realizes efficient and accurate insulator detection.
Patent Information
- Application Number
- CN202610434554.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-03
- Publication Date
- 2026-08-25
AI Technical Summary
Existing single-point scanning detection schemes based on the principle of electric field coupling are unable to identify distance fluctuations caused by platform vibration and real defect signals, resulting in low reliability and positioning accuracy of defect identification, difficulty in achieving precise positioning at the piece level, and low detection efficiency.
By employing a multi-point synchronous induction method, the electrical signals of the insulator are obtained through two sets of induction structures, forming a first electric field curve and a second electric field curve. The results are compared to determine the working condition of the insulator, thereby improving the reliability and accuracy of the detection.
It significantly improves the efficiency and accuracy of insulator testing, enables stable sensing of the electric field around the insulator under non-contact conditions, reduces measurement fluctuations caused by flight disturbances, and provides a highly adaptable and stable online testing technology.
Smart Images
Figure CN122632012A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an insulator testing device, and more particularly to an insulator testing device, testing equipment, and testing method based on an induction array. Background Technology
[0002] Insulators, as core insulating support components of high-voltage transmission lines, bear the dual functions of electrical insulation and mechanical load-bearing. Internal hidden defects (such as moisture absorption, aging and deterioration of the core rod, or partial short circuits) often show no obvious external signs before sudden breakdown, making early warning difficult using traditional manual visual inspection methods. With the advancement of smart grid construction and the widespread adoption of drone inspection technology, insulator defect detection is gradually developing towards automation and non-contact methods, demonstrating significant application value in the field of power grid safety operation and maintenance.
[0003] Insulator inspection technologies primarily employ infrared thermal imaging and visible light image recognition. Infrared thermal imaging identifies defects by detecting temperature anomalies on the insulator surface caused by partial discharge or leakage current. It allows for non-contact measurement during operation and has a certain detection capability for specific defects such as zero-value insulators. However, infrared thermal imaging typically requires disassembling the insulator and heating it in a laboratory environment, making in-situ measurement impossible in a real operating electric field. Furthermore, it can only identify defects when they have developed to the point of producing a significant thermal effect, and is insensitive to early electric field distortions. Visible light image recognition relies on drones equipped with optical cameras to acquire images of the insulator's appearance. Combined with deep learning algorithms (such as the YOLO series), it achieves automatic identification of surface defects such as damage, cracks, and missing skirts. However, visible light image recognition can only identify surface anomalies such as damage and cracks, and is difficult to detect hidden defects such as internal aging and moisture. Moreover, the identification results are easily affected by lighting, weather, and shooting angle, resulting in insufficient stability.
[0004] In recent years, although single-point scanning detection schemes based on the principle of electric field coupling have emerged, single-point sensing structures struggle to distinguish between distance fluctuations caused by platform vibrations and actual defect signals. Vibration interference can easily cause fluctuations in the amplitude of the induced electromotive force, reducing the reliability of defect identification. Furthermore, the defect positioning accuracy is limited in single-point scanning mode, making it difficult to achieve precise location at the sheet level, and multiple round-trip scans are required, resulting in low detection efficiency.
[0005] Therefore, how to solve the defects of the single-point scanning detection scheme based on the principle of electric field coupling is an urgent problem to be solved. Summary of the Invention
[0006] To address the shortcomings mentioned above, this invention provides an insulator detection device, equipment, and method based on an induction array that uses a multi-point synchronous induction method to determine the insulator's operating condition based on the comparison results of two sets of electrical signals for the same insulator. This method can effectively improve the reliability and accuracy of insulator operating condition detection.
[0007] To achieve the above objectives, in a first aspect, the present invention provides an insulator detection device based on an induction array, comprising an induction module and a detection part connected to the induction module, wherein: The sensing module includes at least a first sensing structure and a second sensing structure. The first sensing structure sequentially obtains the first induced potential signal of each umbrella skirt according to the sensing path, and outputs the corresponding first electrical signal value after processing. The second sensing structure sequentially obtains the second induced potential signal of each umbrella skirt according to the sensing path, and outputs the corresponding second electrical signal value after processing. The detection section generates a first electric field curve and a second electric field curve based on the first and second electric signal values input sequentially, and determines the working condition of the insulator based on the comparison results of the first and second electric field curves.
[0008] In one embodiment, the first sensing structure includes a first sensing electrode, a first coupling capacitor, and a first electric field sensor, wherein the first sensing electrode is connected to the first coupling capacitor, the first coupling capacitor is adjacent to the first electric field sensor, and the position of the first sensing electrode faces the umbrella skirt. The second sensing structure includes a second sensing electrode, a second coupling capacitor, and a second electric field sensor, wherein the second sensing electrode is connected to the second coupling capacitor, the second coupling capacitor is adjacent to the second electric field sensor, and the position of the second sensing electrode faces the umbrella skirt.
[0009] In one embodiment, the first sensing electrode obtains the first induced potential signal of each umbrella skirt according to the sensing path, the first coupling capacitor reduces the input high amplitude first induced potential signal to the first induced potential signal of a specified amplitude, and the first electric field sensor outputs the corresponding first electrical signal value after measuring the potential of the first induced potential signal. The second sensing electrode obtains the second induced potential signal of each umbrella skirt according to the sensing path. The second coupling capacitor reduces the high amplitude second induced potential signal to a specified amplitude second induced potential signal. The second electric field sensor measures the potential of the second induced potential signal and outputs the corresponding second electrical signal value.
[0010] In one embodiment, the detection section generates a first differential potential sequence, a first electric field curve corresponding to the first differential potential sequence, a second differential potential sequence, and a second electric field curve corresponding to the second differential potential sequence based on the multiple first electrical signal values and multiple second electrical signal values input sequentially. If the first electrical signal value that is abnormal in the first electric field curve is the same as the second electrical signal value that is abnormal in the second electric field curve, the corresponding umbrella skirt part is determined to be in an abnormal working condition.
[0011] In one embodiment, a receiving portion is further included for fixing the sensing module and the detection portion, wherein both the sensing module and the detection portion are fixed inside the receiving portion.
[0012] Secondly, the present invention also provides a detection device, including the above-mentioned insulator detection device based on an induction array, and an automatic mobile device for driving the insulator detection device based on the induction array to move along a sensing path, wherein the automatic mobile device is connected to the storage part, and the induction module approaches each of the umbrella skirts one by one according to the preset sensing path of the automatic mobile device.
[0013] Thirdly, the present invention also provides a detection device, including the above-mentioned insulator detection device based on an induction array, and a manual moving part for driving the insulator detection device based on the induction array to move along the induction path, wherein the manual moving part is connected to the storage part, and the induction module approaches each of the umbrella skirts one by one along the induction path through the manual moving part.
[0014] Fourthly, the present invention also provides a detection method, applied to the above-mentioned insulator detection device based on an induction array, or applied to the above-mentioned detection equipment, comprising the following steps: The insulator detection device approaches each skirt section one by one along a preset sensing path to sense the first induced potential signal and the second induced potential signal of each skirt section. After processing, the first induced electromotive force signal and the second induced electromotive force signal yield corresponding first electrical signal value and second electrical signal value; The first electric field curve and the second electric field curve are generated based on the first and second electric signal values input sequentially, and the working condition of the insulator is determined based on the comparison results of the first electric field curve and the second electric field curve.
[0015] In one embodiment, the processing of the first induced electromotive force signal and the second induced electromotive force signal to obtain corresponding first electrical signal values and second electrical signal values includes: The first coupling capacitor reduces the high amplitude first induced electromotive force signal to a specified amplitude first induced electromotive force signal, and the first electric field sensor performs potential measurement on the first induced electromotive force signal and outputs the corresponding first electrical signal value. The second coupling capacitor reduces the high amplitude of the input second induced electromotive force signal to a specified amplitude. The second electric field sensor measures the potential of the second induced electromotive force signal and outputs the corresponding second electrical signal value.
[0016] In one embodiment, the process of generating a first electric field curve and a second electric field curve based on the sequentially input first and second electrical signal values, and determining the working condition of the umbrella skirt based on the comparison result of the first and second electric field curves, includes: Based on the sequentially input first electrical signal values and multiple second electrical signal values, a first differential potential sequence, a first electric field curve corresponding to the first differential potential sequence, a second differential potential sequence, and a second electric field curve corresponding to the second differential potential sequence are obtained respectively. If the first electrical signal value that is abnormal in the first electric field curve is the same as the second electrical signal value that is abnormal in the second electric field curve, the corresponding umbrella skirt part is determined to be in an abnormal working condition.
[0017] Compared with the prior art, the present invention has one of the following advantages: This invention employs a multi-point synchronous sensing method to determine the insulator's operating condition based on the comparison results of two sets of electrical signals for the same insulator. This effectively improves the reliability and accuracy of insulator operating condition detection, significantly enhances the efficiency of insulator detection, and provides a highly adaptable and stable online detection technology for intelligent operation and maintenance of power grids. When combined with a drone, the insulator detection device can achieve stable sensing of the electric field around the insulator (i.e., the skirt) within the effective sensing range and under non-contact conditions. The multi-point synchronous sensing method can improve the axial spatial resolution, reduce the dependence on uniform motion, and effectively suppress measurement fluctuations caused by flight disturbances. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the first embodiment of the insulator detection device of the present invention; Figure 2 for Figure 1 A schematic diagram illustrating the principle of insulator testing; Figure 3 This is a schematic diagram of the first embodiment of the detection device in this invention; Figure 4 This is a schematic diagram of the second embodiment of the detection device in this invention; Figure 5 This is a schematic diagram of the second embodiment of the insulator detection device of the present invention; Figure 6 This is a schematic diagram of the third embodiment of the detection device in this invention; Figure 7 This is a flowchart of the detection method in this invention; Figure 8 for Figure 7 Flowchart of the implementation example; Figure 9 A comparison diagram of differential potential sequences; Figure 10 According to Figure 9 A comparison of electric field curves formed by the differential potential sequence.
[0019] The main reference numerals are as follows: 1-Induction module; 2-First induction structure; 201-First induction electrode; 202-First shielded wire; 203-First coupling capacitor; 204-First electric field sensor; 3-Second induction structure; 301-Second induction electrode; 302-Second shielded wire; 303-Second coupling capacitor; 304-Second electric field sensor; 4-Detection part; 5-Storage part; 6-Insulating support rod; 7-Automatic equipment; 701-Connecting part; 8-Insulator; 801-Skirt part. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0021] In the description of this invention, it should be understood that the terms "upper," "lower," "top surface," "bottom surface," and "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example 1
[0022] like Figure 1 and Figure 2 As shown, this embodiment provides an insulator detection device based on an induction array, including an induction module 1 and a detection part 4 connected to the induction module 1, wherein: The sensing module 1 includes a first sensing structure 2 and a second sensing structure 3 arranged at intervals along the axial direction with identical structures. The first sensing structure 2 sequentially approaches each shed 801 in the insulator according to the sensing path to obtain a high-amplitude first induced electromotive force signal from each shed 801, and outputs corresponding first electrical signal values after processing. The number of first electrical signal values output by the first sensing structure 2 is the same as the number of shed 801 sensed, and they correspond according to the sensing order. The second sensing structure 3 sequentially approaches each shed 801 in the insulator according to the sensing path to obtain a high-amplitude second induced electromotive force signal from each shed 801, and outputs corresponding second electrical signal values after processing. The number of second electrical signal values output by the second sensing structure 3 is the same as the number of shed 801 sensed, and they correspond according to the sensing order.
[0023] The detection section 4 is connected to both the first sensing structure 2 and the second sensing structure 3, receiving the first electrical signal values and the second electrical signal values sequentially input from the first sensing structure 2 and the second sensing structure 3. First, each first electrical signal value and each second electrical signal value is processed into a first differential potential sequence and a second differential potential sequence, respectively. Then, the first differential potential sequence and the second differential potential sequence are marked on the insulator electric field curve diagram to form a first electric field curve diagram and a second electric field curve diagram, respectively. Next, the first electric field curve in the first electric field curve diagram and the second electric field curve in the second electric field curve diagram are analyzed to determine whether there are any abnormal first electrical signal values or second electrical signal values in the first electric field curve and the second electric field curve. Finally, if it is determined that there are no abnormal first electrical signal values or second electrical signal values in the first electric field curve and the second electric field curve, then the operating condition of each shed 801 in the insulator is considered normal; otherwise, if it is determined that there are abnormal first electrical signal values or second electrical signal values in the first electric field curve and the second electric field curve, then the operating condition of each shed 801 in the insulator is considered abnormal. At this point, it is determined whether the abnormal first electrical signal value and the abnormal second electrical signal value are consistent. If they are consistent, it is determined that the working condition of the shed part 801 in the insulator corresponding to the abnormal first electrical signal value and the abnormal second electrical signal value is abnormal. Otherwise, if they are inconsistent, the insulator can be re-tested, or the working condition of the testing device can be checked.
[0024] In this embodiment, the first sensing structure 2 further includes a first sensing electrode 201, a first coupling capacitor 203, and a first electric field sensor 204. The first sensing electrode 201 is connected to the first coupling capacitor 203, the first coupling capacitor 203 is adjacent to the first electric field sensor 204, and the position of the first sensing electrode 201 faces the skirt portion 801. The second sensing structure 3 includes a second sensing electrode 301, a second coupling capacitor 303, and a second electric field sensor 304. The second sensing electrode 301 is connected to the second coupling capacitor 303, the second coupling capacitor 303 is adjacent to the second electric field sensor 304, and the position of the second sensing electrode 301 faces the skirt portion 801.
[0025] Specifically, when the first sensing electrode 201 sequentially approaches each shed portion 801 in the insulator according to the sensing path, it obtains a high-amplitude first induced potential signal of each shed portion 801. After the first sensing electrode 201 inputs the first induced potential signal into the first coupling capacitor 203, the first coupling capacitor 203 reduces the input high-amplitude first induced potential signal to a first induced potential signal within a specified amplitude range that the first electric field sensor 204 can analyze. The first electric field sensor 204 performs potential measurement on the first induced potential signal of the specified amplitude to output a corresponding first electrical signal value. When the second sensing electrode 301 sequentially approaches each shed portion 801 in the insulator according to the sensing path, it obtains a high-amplitude second induced potential signal of each shed portion 801. After the second sensing electrode 301 inputs the second induced potential signal into the second coupling capacitor 303, the second coupling capacitor 303 reduces the input high-amplitude second induced potential signal to a second induced potential signal within a specified amplitude range that the second electric field sensor 304 can analyze. The second electric field sensor 304 performs potential measurement on the second induced potential signal of the specified amplitude to output a corresponding second electrical signal value.
[0026] Furthermore, in order to ensure that the first electrical signal value output by the first electric field sensor 204 is approximately the same as the second electrical signal value output by the second electric field sensor 304, the position of the sensing end of the first sensing electrode 201 and the position of the sensing end of the second sensing electrode 301 are approximately on the same plane. This ensures that the high-amplitude first induced potential signal sensed by the first sensing electrode 201 is approximately the same as the high-amplitude second induced potential signal sensed by the second sensing electrode 301, thereby ensuring the accuracy of the analysis of the working conditions of each umbrella skirt 801.
[0027] Preferably, the first sensing electrode 201 and the second sensing electrode 301 are made of a highly conductive metal material, and their geometry can be circular, rectangular, or other symmetrical shapes to adapt to the anti-disturbance requirements of different application scenarios. The first sensing electrode 201 and the second sensing electrode 301 sense the alternating electric field in the space surrounding each umbrella skirt 801 through electric field coupling, generating an induced electromotive force signal corresponding to the local electric field strength. Since the first sensing electrode 201 and the second sensing electrode 301 do not contact each umbrella skirt 801, the safety of the measurement process can be ensured.
[0028] Preferably, the first coupling capacitor 203 and the second coupling capacitor 303 are respectively disposed between the first sensing electrode 201 and the first electric field sensor 204. The first coupling capacitor 203 and the second coupling capacitor 303 perform capacitive voltage division and electrical isolation on the high-amplitude AC potential signal acquired by the first sensing electrode 201 and the second sensing electrode 301. While maintaining the signal change characteristics, they reduce the potential amplitude of the AC potential signal to a specified amplitude range that the first electric field sensor 204 and the second electric field sensor 304 can safely measure. At the same time, they can also block the transmission of high voltage components to the first electric field sensor 204 and the second electric field sensor 304, thus playing an overvoltage protection role.
[0029] Preferably, both the first electric field sensor 204 and the second electric field sensor 304 are MEMS electric field sensors. The first electric field sensor 204 converts each of the sequentially input first induced potential signals into an output first electrical signal corresponding to the spatial electric field strength, and the second electric field sensor 304 converts each of the sequentially input second induced potential signals into an output second electrical signal corresponding to the spatial electric field strength, providing the original data basis for subsequent differential processing and defect identification.
[0030] In this embodiment, the detection section 4 further includes a differential output circuit, a curve generation unit, an analysis unit, and a verification unit.
[0031] Furthermore, the differential output circuit performs real-time differential processing on each input first electrical signal and each input second electrical signal to output a first differential potential sequence and a second differential potential sequence that reflect the change in electric field gradient, respectively. The curve generation unit includes a virtual electric field curve. After the first differential potential sequence is input into the virtual electric field curve, a first electric field curve is formed; after the second differential potential sequence is input into the virtual electric field curve, a second electric field curve is formed. The analysis unit determines whether the first and second electric field curves include abnormal first and second electrical signal values. Specifically, if it is determined that the first and second electric field curves do not contain abnormal first and second electrical signal values, then the operating condition of each shed 801 in the insulator is considered normal; otherwise, if it is determined that the first and second electric field curves contain abnormal first and second electrical signal values, then the operating condition of each shed 801 in the insulator is considered abnormal. The verification unit is used to determine whether the judgment result obtained by the analysis unit based on the first electric field curve is the same as the judgment result obtained based on the first electric field curve. If the judgment results are the same, it is determined that the working condition of the shed part 801 in the insulator corresponding to the abnormal first electrical signal value and the abnormal second electrical signal value is abnormal. Otherwise, if the judgment results are inconsistent, the insulator can be re-tested, or the working condition of the detection device can be checked.
[0032] In this embodiment, the detection part can be a circuit module that can realize the above detection function, or a detection component (such as a microcontroller, PLC, etc.) that can realize the above detection function.
[0033] In this embodiment, the detection device further includes a storage part 5 for fixing the sensing module 1 and the detection part 4, wherein the sensing module 1 and the detection part 4 are both fixed inside the storage part 5.
[0034] Preferably, the housing 5 is a shell, and the first coupling capacitor 203, the first electric field sensor 204, the second coupling capacitor 303, the second electric field sensor 304 and the detection part 4 are all fixed inside the shell. A part of the first sensing electrode 201 and a part of the second sensing electrode 301 are located inside the shell, and the other part of the first sensing electrode 201 and the other part of the second sensing electrode 301 are located outside the shell.
[0035] Example 2 like Figure 3 As shown, this embodiment provides a detection device, including the insulator detection device described in Embodiment 1 above, and an automatic mobile device 7 for moving the insulator detection device according to the sensing path. The automatic mobile device 7 is connected to the storage part 5, and the insulator detection device approaches each skirt part 801 one by one according to the preset sensing path of the automatic mobile device 7.
[0036] In this embodiment, the automatic mobile device 7 is a drone, and the storage part 5 is fixed to the lower area of the drone via the connecting part 701. When the drone moves along the sensing path, the first sensing electrode 201 and the second sensing electrode 301 in the insulator detection device approach each umbrella skirt 801 in sequence, so as to obtain the high amplitude first induced electromotive force signal and the high amplitude second induced electromotive force signal of each umbrella skirt 801 respectively.
[0037] In this embodiment, the drone is combined with the insulator detection device to achieve multi-point synchronous sensing and highly robust measurement of the axial electric field distribution of insulator 8 under actual flight conditions of non-uniform speed and vibration disturbance of the drone. The defect detection and location of the entire string of insulators 8 can be completed in a single scan, which significantly improves the reliability of detecting hidden defects and the efficiency of inspection. Example 3
[0038] like Figure 4 As shown, this embodiment provides a detection device, including the insulator detection device described in Embodiment 1 above, and a manual moving part for moving the insulator detection device along the sensing path. The manual moving part is connected to the storage part 5, so that the insulator detection device approaches each shed part 801 in the insulator 8 one by one along the sensing path via the manual moving part.
[0039] Optionally, the manually movable part is an insulating support rod 6 fixed to the bottom end face or side wall of the storage part 5.
[0040] In this embodiment, when there is no automatic mobile equipment at the testing site, the insulator testing device can approach each umbrella skirt 801 one by one along the sensing path through the insulating support rod 6, so as to obtain the high amplitude first induced electromotive force signal and the high amplitude second induced electromotive force signal of each umbrella skirt 801 respectively. Example 4
[0041] like Figure 5 As shown, this embodiment provides an insulator detection device based on an induction array, including an induction module and a detection part 4 connected to the induction module. The difference between this embodiment and the first embodiment described above is that: The first sensing structure 2 includes a first sensing electrode 201, a first shielding wire 202, a first coupling capacitor 203, and a first electric field sensor 204. The first sensing electrode 201 is connected to the first coupling capacitor 203 via the first shielding wire 202. The second sensing structure 3 includes a second sensing electrode 301, a second shielding wire 302, a second coupling capacitor 303, and a second electric field sensor 304. The second sensing electrode 301 is connected to the second coupling capacitor 303 via the second shielding wire 302. The housing part 5 is a rigid substrate with an open top end face. Both the sensing module 1 and the detection part 4 are fixed inside the rigid substrate.
[0042] Since the first sensing electrode 201, the first shielding wire 202, the second sensing electrode 301, and the second shielding wire 302 are all located on the outside of the rigid substrate, in order to increase the strength of the first shielding wire 202 and the second shielding wire 302, a sleeve with a certain rigidity can be sleeved on the outside of the first shielding wire 202 and the second shielding wire 302, so that the first sensing electrode 201 and the second sensing electrode 301 can be continuously maintained in the required position, so as to ensure that a precise high-amplitude first induced potential signal and a high-amplitude second induced potential signal can be obtained. Example 5
[0043] like Figure 6 As shown, this embodiment provides a detection device, including the insulator detection device described in the above embodiment four, and an automatic mobile device 7 for moving the insulator detection device according to the sensing path. The automatic mobile device 7 is connected to a rigid substrate, and the insulator detection device approaches each shed part 801 in the insulator 8 one by one according to the preset sensing path of the automatic mobile device 7.
[0044] In this embodiment, the automatic mobile device 7 is a drone, and the rigid substrate is fixed to the lower region of the drone via the connecting part 701. When the drone moves along the sensing path, the first sensing electrode 201 and the second sensing electrode 301 in the insulator detection device sequentially approach each umbrella skirt 801 to obtain the high-amplitude first induced potential signal and the high-amplitude second induced potential signal of each umbrella skirt 801, respectively. Example 6
[0045] like Figure 7 As shown, this embodiment provides a detection method applied to the insulator detection device and detection equipment in Embodiments 1 and 5 above, including the following steps: S701. The insulator detection device approaches each skirt one by one along the preset sensing path to sense the first induced electromotive force signal and the second induced electromotive force signal of each skirt. S702. After processing, the first induced electromotive force signal and the second induced electromotive force signal yield corresponding first electrical signal values and second electrical signal values. S703. Calculate the first electric field curve and the second electric field curve based on the first and second electric signal values input sequentially, and determine the working condition of the insulator based on the first and second electric field curves.
[0046] Example 7 like Figures 8 to 10 As shown, this embodiment provides a detection method, including the following steps: S801. After the detection device is combined with the drone, it moves toward the insulator to be tested.
[0047] Specifically, the detection device is mounted on the lower part of the drone, the drone's attitude is adjusted so that the detection device is parallel to the axis of the insulator being tested, and the distance between the first and second sensing electrodes and the skirt is kept within a preset safe range by the laser ranging module, so that the first and second sensing electrodes can sense the electric field signal on or around the skirt without contacting the skirt.
[0048] S802, Obtain the first induced potential signal and the second induced potential signal of each umbrella skirt.
[0049] Specifically, the drone moves according to a preset sensing path. When the first sensing electrode and the second sensing electrode sequentially approach each skirt in the insulator according to the sensing path, they obtain the high-amplitude first induced potential signal and the high-amplitude second induced potential signal of each skirt.
[0050] When the insulator is under AC operating voltage, an AC electric field distributed along the axis is formed in the space around it. The first induction electrode and the second induction electrode synchronously sense the electric field signal of each skirt part at the corresponding position to form a high-amplitude first induced electromotive force signal and a high-amplitude second induced electromotive force signal.
[0051] S803, reduce the high-amplitude first induced electromotive force signal and the high-amplitude second induced electromotive force signal to a first induced electromotive force signal within a specified amplitude range and a first induced electromotive force signal within a specified amplitude range.
[0052] Specifically, after a high-amplitude first induced potential signal is input to the first coupling capacitor, the first coupling capacitor reduces the input high-amplitude first induced potential signal to a first induced potential signal within a specified amplitude range that the first electric field sensor can analyze. After a high-amplitude second induced potential signal is input to the second coupling capacitor, the second coupling capacitor reduces the input high-amplitude second induced potential signal to a second induced potential signal within a specified amplitude range that the second electric field sensor can analyze.
[0053] The coupling capacitor performs capacitive coupling and voltage division processing on the high-amplitude induced electromotive force signal. While maintaining the signal change characteristics, the coupling capacitor reduces the high-amplitude induced electromotive force signal to the safe measurement range of the MEMS electric field sensor. At the same time, it achieves electrical isolation between the high-voltage side and the low-voltage side, ensuring the safety of the measurement process.
[0054] S804. Measure the potential of a first induced electromotive force signal with a specified amplitude and a second induced electromotive force signal with a specified amplitude, and output the first electrical signal value and the second electrical signal value.
[0055] S805 outputs a first differential potential sequence and a second differential potential sequence that can reflect the change in electric field gradient.
[0056] Specifically, the differential output circuit performs real-time differential processing on each of the input first electrical signals and each of the second electrical signals to output a first differential potential sequence and a second differential potential sequence that can reflect the change of electric field gradient.
[0057] S806, respectively generate the first electric field curve diagram and the first electric field curve diagram.
[0058] Specifically, after the first differential potential sequence is input into the virtual electric field curve, a first electric field curve is formed; after the second differential potential sequence is input into the virtual electric field curve, a second electric field curve is formed.
[0059] Among them, the curve in the first electric field curve diagram is the first electric field distribution characteristic curve of all the sheds in the insulator, and the curve in the second electric field curve diagram is the second electric field distribution characteristic curve of all the sheds in the insulator.
[0060] S807. Determine whether the first electric field curve and the second electric field curve include abnormal first and second electrical signal values.
[0061] Specifically, the electric field curve of the insulator under normal operating conditions is set to be a roughly uniform arc-shaped curve. In the first and second electric field curve diagrams (e.g.) Figure 9 and Figure 10 As shown in the figure, determine whether the first electric field curve and the second electric field curve formed by the first differential potential sequence and the second differential potential sequence are approximately uniform arc-shaped curves.
[0062] S808. Determine that the working condition of each skirt in the insulator is normal.
[0063] Specifically, in the first electric field curve and the second electric field curve (see details) Figure 9 and Figure 10(Based on the curves formed by the central dot and multiple dots), when the first electric field curve and the second electric field curve formed by the first differential potential sequence and the second differential potential sequence are determined to be roughly uniform arc-shaped curves, it is considered that the working condition of each shed part in the insulator is normal.
[0064] S809. Determine whether the results obtained from the first electric field curve are the same as those obtained from the second electric field curve.
[0065] Specifically, in the first and second electric field curves, if a significant difference exists between a certain first electrical signal value in the first electric field curve and a certain second electrical signal value in the second electric field curve, preventing the formation of a roughly uniform arc-shaped curve, it is determined that the operating condition of one of the sheds in the insulator is abnormal, resulting in a distortion of the electric field distribution on its surface or surrounding area. In this case, the abnormal first electrical signal value in the first electric field curve and the abnormal second electrical signal value in the second electric field curve are compared to determine if the results are the same.
[0066] S810. Re-inspect the insulators or check the testing equipment.
[0067] For example, in the first and second electric field curves, a significant change in the fifth first electrical signal value in the first electric field curve prevents the formation of a roughly uniform arc-shaped curve, indicating an abnormal condition in the fifth shed of the insulator. Similarly, a significant change in the sixth second electrical signal value in the second electric field curve prevents the formation of a roughly uniform arc-shaped curve, indicating an abnormal condition in the sixth shed of the insulator. Because the results differ, the insulator can be re-tested, or the operating condition of the testing device can be checked.
[0068] S811, The working condition of the insulator's skirt section is abnormal.
[0069] For example, in the first and second electric field curves, a significant change in the fifth first electrical signal value in the first electric field curve prevents the formed first electric field curve from forming a roughly uniform arc shape, thus indicating an abnormal operating condition of the fifth shed in the insulator. Similarly, a significant change in the fifth second electrical signal value in the second electric field curve prevents the formed second electric field curve from forming a roughly uniform arc shape, again indicating an abnormal operating condition of the fifth shed in the insulator. Since the results are the same, it is determined that the operating conditions of the sheds corresponding to the abnormal first and second electrical signal values are abnormal, and simultaneously, the current operating condition of the insulator is also determined to be abnormal.
[0070] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.
Claims
1. An insulator detection device based on an induction array, characterized in that, Includes a sensing module and a detection unit connected to the sensing module, wherein: The sensing module includes at least a first sensing structure and a second sensing structure. The first sensing structure sequentially obtains the first induced potential signal of each umbrella skirt according to the sensing path, and outputs the corresponding first electrical signal value after processing. The second sensing structure sequentially obtains the second induced potential signal of each umbrella skirt according to the sensing path, and outputs the corresponding second electrical signal value after processing. The detection section generates a first electric field curve and a second electric field curve based on the first and second electric signal values input sequentially, and determines the working condition of the insulator based on the comparison results of the first and second electric field curves.
2. The insulator detection device based on an induction array according to claim 1, characterized in that, The first sensing structure includes a first sensing electrode, a first coupling capacitor, and a first electric field sensor, wherein the first sensing electrode is connected to the first coupling capacitor, the first coupling capacitor is adjacent to the first electric field sensor, and the position of the first sensing electrode faces the umbrella skirt. The second sensing structure includes a second sensing electrode, a second coupling capacitor, and a second electric field sensor, wherein the second sensing electrode is connected to the second coupling capacitor, the second coupling capacitor is adjacent to the second electric field sensor, and the position of the second sensing electrode faces the umbrella skirt.
3. The insulator detection device based on an induction array according to claim 2, characterized in that, The first sensing electrode obtains the first induced potential signal of each umbrella skirt according to the sensing path. The first coupling capacitor reduces the high amplitude first induced potential signal to a specified amplitude first induced potential signal. The first electric field sensor measures the potential of the first induced potential signal and outputs the corresponding first electrical signal value. The second sensing electrode obtains the second induced potential signal of each umbrella skirt according to the sensing path. The second coupling capacitor reduces the high amplitude second induced potential signal to a specified amplitude second induced potential signal. The second electric field sensor measures the potential of the second induced potential signal and outputs the corresponding second electrical signal value.
4. The insulator detection device based on an induction array according to claim 3, characterized in that, The detection section generates a first differential potential sequence, a first electric field curve corresponding to the first differential potential sequence, a second differential potential sequence, and a second electric field curve corresponding to the second differential potential sequence based on the multiple first electrical signal values and multiple second electrical signal values input sequentially. If the first electrical signal value that is abnormal in the first electric field curve is the same as the second electrical signal value that is abnormal in the second electric field curve, the corresponding umbrella skirt part is determined to be in an abnormal working condition.
5. The insulator detection device based on an induction array according to any one of claims 1 to 4, characterized in that, It also includes a housing for fixing the sensing module and the detection part, wherein both the sensing module and the detection part are fixed inside the housing.
6. A testing device, characterized in that, The device includes an insulator detection device based on an induction array as described in any one of claims 1 to 5, and an automatic mobile device for moving the insulator detection device based on the induction array along a sensing path, wherein the automatic mobile device is connected to the storage unit, and the sensing module approaches each of the umbrella skirts one by one according to a preset sensing path of the automatic mobile device.
7. A testing device, characterized in that, The device includes an insulator detection device based on an induction array as described in any one of claims 1 to 5, and a manual moving part for moving the insulator detection device based on the induction array along the induction path, wherein the manual moving part is connected to the storage part, and the induction module approaches each of the umbrella skirts one by one along the induction path via the manual moving part.
8. A detection method, characterized in that, The insulator detection device based on an induction array, applicable to any one of claims 1 to 5, or applicable to the detection equipment described in claim 6 or 7, comprises the following steps: The insulator detection device approaches each skirt section one by one along a preset sensing path to sense the first induced potential signal and the second induced potential signal of each skirt section. After processing, the first induced electromotive force signal and the second induced electromotive force signal yield corresponding first electrical signal value and second electrical signal value; The first electric field curve and the second electric field curve are generated based on the first and second electric signal values input sequentially, and the working condition of the insulator is determined based on the comparison results of the first electric field curve and the second electric field curve.
9. The detection method according to claim 8, characterized in that, After processing the first induced electromotive force signal and the second induced electromotive force signal, the corresponding first electrical signal value and second electrical signal value are obtained, including: The first coupling capacitor reduces the high amplitude first induced electromotive force signal to a specified amplitude first induced electromotive force signal, and the first electric field sensor performs potential measurement on the first induced electromotive force signal and outputs the corresponding first electrical signal value. The second coupling capacitor reduces the high amplitude of the input second induced electromotive force signal to a specified amplitude. The second electric field sensor measures the potential of the second induced electromotive force signal and outputs the corresponding second electrical signal value.
10. The detection method according to claim 8, characterized in that, The process of generating a first electric field curve and a second electric field curve based on the sequentially input first and second electrical signal values, and determining the working condition of the umbrella skirt based on the comparison result of the first and second electric field curves, includes: Based on the sequentially input first electrical signal values and multiple second electrical signal values, a first differential potential sequence, a first electric field curve corresponding to the first differential potential sequence, a second differential potential sequence, and a second electric field curve corresponding to the second differential potential sequence are obtained respectively. If the first electrical signal value that is abnormal in the first electric field curve is the same as the second electrical signal value that is abnormal in the second electric field curve, the corresponding umbrella skirt part is determined to be in an abnormal working condition.