Dry-type air-core reactor defect detection method and device

Abstract

The application relates to a dry-type air-core reactor defect detection method, device and system. The method comprises the following steps: applying an excitation signal to a dry-type air-core reactor, acquiring the magnetic field strength detected by a magnetic field monitoring sensor on the dry-type air-core reactor, the magnetic field monitoring sensor is distributed on the inner surface and the outer surface of the dry-type air-core reactor; generating a three-dimensional B distribution atlas of the surface induced magnetic field of the dry-type air-core reactor according to the magnetic field strength detected by the magnetic field monitoring sensor when the magnetic field strength is maximum; acquiring the magnetic field strength detected by a portable magnetic field detection device on each layer winding of a defect area of the dry-type air-core reactor, and performing defect positioning analysis on the defect area, wherein the defect area is determined according to the three-dimensional B distribution atlas. The method can solve the problem that the traditional reactor defect detection method is greatly affected by environmental factors and cannot reflect the defects of the reactor, and can accurately test the defects of the reactor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment, and in particular to a dry-type air-core reactor defect detection method, device and system. BACKGROUND

[0002] With the development of China's extra-high voltage and ultra-high voltage power systems, dry-type air-core reactors have been widely used in extra-high voltage and ultra-high voltage power systems. In recent years, dry-type air-core reactor accidents have occurred frequently, and fire accidents have also occurred from time to time, which seriously threatens the safe operation of the power system. The burning of the reactor, fire fighting and power outage in the accident have brought huge economic losses to the system and caused adverse social impact. Therefore, it is necessary to find out the defect position of the dry-type air-core reactor in time and quickly carry out maintenance and maintenance work.

[0003] The traditional defect detection of the reactor is mainly through periodic direct current resistance and inductance test, and turn-to-turn induction impulse voltage test to detect defects, but in actual work, because the direct current resistance and inductance of the dry-type air-core reactor are mostly small, and the measurement results are greatly affected by environmental factors, the defects of the reactor cannot be reflected through the test of direct current resistance and inductance. SUMMARY

[0004] Therefore, it is necessary to provide a dry-type air-core reactor defect detection method, device and system capable of accurately testing the defects of the reactor in view of the above technical problems.

[0005] In a first aspect, the present application provides a dry-type air-core reactor defect detection method, which comprises:

[0006] An excitation signal is applied to the dry-type air-core reactor, and the magnetic field strength detected by the magnetic field monitoring sensor of the dry-type air-core reactor is obtained; the magnetic field monitoring sensor is distributed on the inner surface and the outer surface of the dry-type air-core reactor;

[0007] A three-dimensional B distribution map of the surface induction magnetic field of the dry-type air-core reactor is generated according to the magnetic field strength detected by the magnetic field monitoring sensor when the magnetic field strength is maximum;

[0008] The magnetic field strength detected by the portable magnetic field detection device on each layer winding of the defect area of the dry-type air-core reactor is obtained, and defect positioning analysis is performed on the defect area; the defect area is determined according to the three-dimensional B distribution map.

[0009] In one of the embodiments, the excitation signal is an adjustable frequency sinusoidal alternating current excitation signal.

[0010] In one of the embodiments, the frequency range of the sinusoidal alternating current excitation signal is 1Hz-10000Hz.

[0011] In one embodiment, the magnetic field strength detected by the portable magnetic field detection device on each layer winding of the defect area of the dry-type air-core reactor is obtained, and defect positioning analysis is performed on the defect area, including:

[0012] The magnetic field strength detected by the portable magnetic field detection device on each layer winding of the defect area of the dry-type air-core reactor is obtained.

[0013] According to the magnetic field strength detected by the portable magnetic field detection device, an accurate three-dimensional B distribution map of the magnetic field induced by each layer winding of the defect area of the dry-type air-core reactor is generated; the accurate three-dimensional B distribution map is used to determine the winding of the dry-type air-core reactor that has defects.

[0014] In a second aspect, the application also provides a dry-type air-core reactor defect detection device, which includes:

[0015] A magnetic field detection module is configured to apply an excitation signal to the dry-type air-core reactor, and obtain the magnetic field strength detected by the magnetic field monitoring sensor on the dry-type air-core reactor; the magnetic field monitoring sensor is distributed on the inner surface and the outer surface of the dry-type air-core reactor.

[0016] A map drawing module is configured to generate a three-dimensional B distribution map of the surface induced magnetic field of the dry-type air-core reactor according to the magnetic field strength detected by the dry-type air-core reactor when the magnetic field strength is maximum.

[0017] A specific positioning module is configured to obtain the magnetic field strength detected by the portable magnetic field detection device on each layer winding of the defect area of the dry-type air-core reactor, and perform defect positioning analysis on the defect area; the defect area is determined according to the three-dimensional B distribution map.

[0018] In a third aspect, the application also provides a dry-type air-core reactor defect detection system. The dry-type air-core reactor defect detection system includes a reactor defect detection device, a portable magnetic field detection device, and a magnetic field monitoring sensor distributed on the inner surface and the outer surface of the dry-type air-core reactor; the reactor defect detection device is in wireless communication with the magnetic field monitoring sensor, and the reactor defect detection device is also connected to the portable magnetic field detection device; the reactor defect detection device is configured to perform defect detection on the dry-type air-core reactor according to the above method.

[0019] In one embodiment, the wireless communication mode between the reactor defect detection device and the magnetic field monitoring sensor includes at least one of Bluetooth, WiFi, and 433Hz broadcast frequency band.

[0020] In one of the embodiments, the magnetic field monitoring sensors are evenly fixed on the inner and outer surfaces of the dry-type air-core reactor in an equidistant array.

[0021] In one of the embodiments, the magnetic field monitoring sensors are fixed on the dry-type air-core reactor by pasting or binding.

[0022] In one of the embodiments, the reactor defect detection device comprises a shell, a wireless communication unit, a portable magnetic field probe interface, an excitation signal interface, an interactive device and a control board, the control board is arranged in the shell, the wireless communication unit, the portable magnetic field probe interface, the excitation signal interface and the interactive device are arranged on the outer surface of the shell and connected with the control board, the wireless communication unit is in wireless communication with the magnetic field monitoring sensors, and the control board is connected with the portable magnetic field probe device through the portable magnetic field probe interface.

[0023] The above dry-type air-core reactor defect detection method, device and system preliminarily determine the area with defects by applying an excitation signal to the dry-type air-core reactor and analyzing the obtained three-dimensional B distribution map, and further determine the position of the defect area by detecting each layer of winding of the reactor, thereby solving the problem that the traditional reactor defect detection method is greatly affected by environmental factors and cannot reflect the defects of the reactor. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is an application environment diagram of the dry-type air-core reactor defect detection method in one of the embodiments;

[0025] Figure 2 It is a flowchart of the dry-type air-core reactor defect detection method in one of the embodiments;

[0026] Figure 3 It is a flowchart of the specific positioning of defects in the dry-type air-core reactor defect detection method in one of the embodiments;

[0027] Figure 4 It is a structure block diagram of the dry-type air-core reactor defect detection device in one of the embodiments;

[0028] Figure 5 It is a structure diagram of the reactor defect detection device in one of the embodiments. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0030] The dry-type air-core reactor defect detection method provided by the embodiments of the present application can be applied to the application environment shown in Figure 1 . The dry-type reactor 100 can be a dry-type air-core reactor in a transformer substation or a converter station. The magnetic field monitoring sensor 103 is arranged on the inner surface and the outer surface of the dry-type air-core reactor 100. An excitation signal is applied to the dry-type air-core reactor 100. The sine alternating excitation signal input end is connected to one side of the dry-type air-core reactor 100 through the wiring end 101, and the sine alternating excitation signal output end is connected to the other side of the dry-type air-core reactor 100 through the wiring end 102, to form a loop and generate a magnetic field in the dry-type air-core reactor 100. The reactor defect detection device detects the magnetic field strength and generates a three-dimensional B distribution map of the surface induced magnetic field of the dry-type air-core reactor 100. By analyzing the three-dimensional B distribution map, the defect area is preliminarily found. Then, the magnetic field strength of each layer of winding in the defect area is detected by using the portable magnetic field detection device. The reactor defect detection device generates an accurate three-dimensional B distribution map to complete the specific positioning of the defect. The reactor defect detection device includes a shell, a wireless communication unit, a portable magnetic field probe interface, an excitation signal interface, an interactive device, and a control board. The control board is arranged in the shell. The wireless communication unit, the portable magnetic field probe interface, the excitation signal interface, and the interactive device are arranged on the outer surface of the shell and connected to the control board. The wireless communication unit is wirelessly connected to the magnetic field monitoring sensor. The control board is connected to the portable magnetic field detection device through the portable magnetic field probe interface.

[0031] In one embodiment, as shown in Figure 2 , a dry-type air-core reactor defect detection method is provided. The method is described by taking the reactor defect detection device in Figure 1 as an example, which includes the following steps:

[0032] In step 210, an excitation signal is applied to the dry-type air-core reactor to obtain the magnetic field strength detected by the magnetic field monitoring sensor. The magnetic field monitoring sensor is arranged on the inner surface and the outer surface of the dry-type air-core reactor.

[0033] The magnetic field monitoring sensor is used to detect the size of the magnetic field strength of the dry-type air-core reactor when the excitation signal is applied. Specifically, before the excitation signal is applied to the dry-type air-core reactor, the lead connected with other electrical equipment is removed, the connection between the dry-type air-core reactor and other electrical equipment is disconnected to prevent interference of other electrical equipment on the dry-type air-core reactor, and then the magnetic field monitoring sensors are uniformly fixed on the inner and outer surfaces of the dry-type air-core reactor in an equidistant array. Further, the interval distance between the magnetic field monitoring sensors is less than or equal to 10 cm, and the magnetic field monitoring sensors have higher detection sensitivity in this range, so that the detection result is more accurate. The magnetic field monitoring sensors are fixed on the dry-type air-core reactor in a non-unique way, and can be fixed on the dry-type air-core reactor by pasting or binding, and the specific fixing method is selected according to the dirt degree of the surface of the dry-type air-core reactor to ensure that the magnetic field monitoring sensors can be stably attached to the surface of the dry-type air-core reactor. After the magnetic field monitoring sensors are fixed on the dry-type air-core reactor, the reactor defect detection device is connected with the dry-type air-core reactor through test wiring, an excitation signal is applied to the dry-type air-core reactor, and the magnetic field strength is detected.

[0034] In step 220, a three-dimensional B distribution map of the surface induced magnetic field of the dry-type air-core reactor is generated according to the magnetic field strength detected by the magnetic field monitoring sensor when the magnetic field strength is maximum.

[0035] The three-dimensional B distribution map is a map reflecting the magnetic field distribution on the surface of the dry-type air-core reactor. Specifically, the excitation signal is a sinusoidal alternating excitation signal with adjustable frequency, the frequency of the excitation signal is adjusted to make the magnetic field strength detected by the magnetic field monitoring sensor maximum, and then a three-dimensional B distribution map of the surface induced magnetic field of the dry-type air-core reactor is generated according to the data when the magnetic field strength is maximum. Further, the excitation signal can be a sinusoidal alternating excitation signal with adjustable frequency, and the current effective value is 20 A and the voltage effective value is 20 V. The voltage effective value and the current effective value can be adjusted according to different types of reactors, the generated three-dimensional B distribution map and other factors, so that the three-dimensional B distribution map of the surface induced magnetic field of the dry-type air-core reactor is more accurate. In addition, the frequency adjustment range of the excitation signal is 1 Hz-10000 Hz.

[0036] In step 230, the magnetic field strength detected by the portable magnetic field detection device on each layer winding of the defect area of the dry-type air-core reactor is obtained, and defect positioning analysis is performed on the defect area. The defect area is determined according to the three-dimensional B distribution map.

[0037] The three-dimensional B distribution map of the normal area is smooth and uniform, and the defect area has fluctuations and fluctuations, so as to determine the defect area of the dry-type air-core reactor; after determining the defect area, each layer winding of the dry-type air-core reactor is detected by using the portable magnetic field detection device, so as to obtain the accurate positioning of the defect area. It can be understood that the analysis of the three-dimensional B distribution map can determine the defect area by comparing the magnetic induction intensity data of the magnetic field monitoring sensor array collected by the reactor defect detection device, or the reactor defect detection device can draw a map according to the magnetic induction intensity data of the magnetic field monitoring sensor array collected by the reactor defect detection device, and the user can determine the defect area according to the position of the fluctuations and fluctuations in the map. In the embodiment, the user determines the defect area by observing the generated map manually.

[0038] In the above dry-type air-core reactor defect detection method, the magnetic field strength detected by the magnetic field monitoring sensor distributed on the inner and outer surfaces of the dry-type air-core reactor is obtained by applying an excitation signal to the dry-type air-core reactor, and a three-dimensional B distribution map of the surface induction magnetic field of the dry-type air-core reactor is generated according to the magnetic field strength detected by the magnetic field monitoring sensor when the magnetic field strength is maximum. The defect area of the dry-type air-core reactor is determined by preliminary analysis, and then each layer winding in the defect area is further detected to realize accurate detection and positioning of the defect area.

[0039] In one embodiment, as shown in FIG. 2, Figure 3 Step 230 includes:

[0040] Step 231, obtaining the magnetic field strength detected by the portable magnetic field detection device for each layer winding of the dry-type air-core reactor defect area.

[0041] The dry-type air-core reactor is a whole composed of multiple layer winding cylinders, that is, multiple reactor winding cylinders are arranged in the radial direction to form a whole superimposed winding cylinder, and the interval between the middle multiple winding cylinders is 1cm-1.5cm. It is difficult to fix the magnetic field monitoring sensor on the surface of each layer winding cylinder, and it is impossible to realize accurate detection of the magnetic field of the middle multiple winding cylinders, so the telescopic rod can be used to carry the portable magnetic field detection device close to or contact the surface of the winding cylinder to realize the detection of the magnetic field strength of each layer winding.

[0042] Step 232, generating an accurate three-dimensional B distribution map of the induction magnetic field of each layer winding of the defect area of the dry-type air-core reactor according to the magnetic field strength detected by the portable magnetic field detection device; the accurate three-dimensional B distribution map is used to determine the winding with defects of the dry-type air-core reactor.

[0043] The accurate three-dimensional B distribution map is a map reflecting the surface magnetic field distribution of each layer of winding of the defect area of the dry-type air-core reactor, and the map of the normal area in the accurate three-dimensional B distribution map is smooth and uniform, and the defect area will have fluctuations and fluctuations. On the basis of determining the defect area, each layer of winding in the defect area is detected to realize further positioning and detection of the defect. It can be understood that the analysis of the accurate three-dimensional B distribution map can be used by the portable magnetic field detection device to determine the specific defect position by comparing the magnetic induction intensity data of each layer of winding surface in the defect area collected. The specific defect position can also be determined by the reactor defect detection device according to the magnetic induction intensity data of each layer of winding surface in the defect area collected by the portable magnetic field detection device to draw a map, and the user determines the specific defect position according to the position of the fluctuations and fluctuations in the map. In the embodiment, the user determines the specific defect position by observing the generated map manually.

[0044] In the embodiment, the magnetic field intensity detected by the portable magnetic field detection device on each layer of winding of the defect area of the dry-type air-core reactor is obtained, and then the accurate three-dimensional B distribution map of the magnetic field of each layer of winding of the defect area of the dry-type air-core reactor is generated according to the magnetic field intensity detected by the portable magnetic field detection device. The accurate three-dimensional B distribution map is analyzed to realize further positioning and detection of the defect.

[0045] It should be understood that although each step in the flowchart involved in each of the above embodiments is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise stated herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each of the above embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0046] Based on the same inventive concept, the embodiments of the present application also provide a dry-type air-core reactor defect detection device for implementing the above-mentioned dry-type air-core reactor defect detection method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more dry-type air-core reactor defect detection device embodiments provided below can refer to the limitations of the dry-type air-core reactor defect detection method described above, which will not be repeated here.

[0047] In one embodiment, as Figure 4As shown, a dry-type air-core reactor defect detection device is provided, comprising a magnetic field detection module 402, a mapping module 404 and a specific positioning module 406, wherein:

[0048] The magnetic field detection module 402 is configured to apply an excitation signal to the dry-type air-core reactor, and obtain the magnetic field strength detected by the magnetic field monitoring sensor on the dry-type air-core reactor. The magnetic field monitoring sensor is distributed on the inner surface and the outer surface of the dry-type air-core reactor.

[0049] The mapping module 404 is configured to generate a three-dimensional B distribution map of the surface induced magnetic field of the dry-type air-core reactor according to the magnetic field strength detected by the dry-type air-core reactor when the magnetic field strength is maximum.

[0050] The specific positioning module 406 is configured to obtain the magnetic field strength detected by the portable magnetic field detection device on each layer winding of the defect area of the dry-type air-core reactor, and perform defect positioning analysis on the defect area. The defect area is determined according to the three-dimensional B distribution map.

[0051] In one embodiment, the excitation signal is a sinusoidal alternating excitation signal with adjustable frequency.

[0052] In one embodiment, the frequency range of the sinusoidal alternating excitation signal is 1 Hz-10000 Hz.

[0053] In one embodiment, the specific positioning module 406 is configured to obtain the magnetic field strength detected by the portable magnetic field detection device on each layer winding of the defect area of the dry-type air-core reactor, and generate an accurate three-dimensional B distribution map of the induced magnetic field of each layer winding of the defect area of the dry-type air-core reactor according to the magnetic field strength detected by the portable magnetic field detection device. The accurate three-dimensional B distribution map is used to determine the winding with defects in the dry-type air-core reactor.

[0054] The above-mentioned various modules of the dry-type air-core reactor defect detection device can be realized by software, hardware and their combinations in whole or in part. The above-mentioned various modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to call and execute the operations corresponding to the above-mentioned various modules by the processor.

[0055] In one embodiment, a dry-type air-core reactor defect detection system is provided, comprising a reactor defect detection device, a portable magnetic field detection device and a magnetic field monitoring sensor, wherein the magnetic field monitoring sensor is distributed on the inner surface and the outer surface of the dry-type air-core reactor; the reactor defect detection device is in wireless communication with the magnetic field monitoring sensor, and the reactor defect detection device is also connected with the portable magnetic field detection device. The reactor defect detection device is configured to perform defect detection on the dry-type air-core reactor according to the above-mentioned method.

[0056] In one embodiment, asFigure 5 As shown in the figure, the reactor defect detection device comprises a shell 510, a wireless communication unit 520, a portable magnetic field probe interface 530, an excitation signal interface 540, an interactive device 550 and a control board, the control board is arranged in the shell, the wireless communication unit 520, the portable magnetic field probe interface 530, the excitation signal interface 540 and the interactive device 550 are arranged on the outer surface of the shell 510 and connected with the control board, the wireless communication unit 520 communicates with the magnetic field monitoring sensor wirelessly; the control board is connected with the portable magnetic field detection device through the portable magnetic field probe interface 530.

[0057] Specifically, the wireless communication unit 520, the portable magnetic field probe interface 530, the excitation signal interface 540 and the interactive device 550 are arranged on the shell 510, and the shell 510 provides a carrier for the connection of each unit and the control board.

[0058] The wireless communication unit 520 is divided into an inner cylinder communication unit 521 and an outer cylinder communication unit 522, and the wireless communication mode includes at least one of Bluetooth, WiFi and 433MHz broadcast frequency band, and the specific selection depends on the electromagnetic interference situation on site. The inner cylinder communication unit 521 and the outer cylinder communication unit 522 respectively communicate with the magnetic field monitoring sensors arranged on the inner surface and the outer surface of the dry-type air-core reactor, transmit the data collected by the magnetic field monitoring sensors to the control board, and the control board processes the obtained data. In this embodiment, the reactor defect detection device draws a graph according to the obtained data, and the user determines the defect area according to the position of the fluctuations and fluctuations in the graph. Further, the magnetic field monitoring sensor can be fixed to the dry-type air-core reactor by pasting or binding, and the specific fixing method is selected according to the dirt degree on the surface of the dry-type air-core reactor to ensure that the magnetic field monitoring sensor can be stably attached to the surface of the dry-type air-core reactor.

[0059] The portable magnetic field probe interface 530 is connected with the portable magnetic field detection device. Since the dry-type air-core reactor is composed of multiple winding cylinder sleeves, that is, multiple reactor winding cylinders are arranged radially to form an integral superimposed winding cylinder, and the interval between the middle multiple winding cylinders is 1cm-1.5cm, it is difficult to fix the magnetic field monitoring sensor to the surface of each winding cylinder, and it is impossible to realize accurate detection of the magnetic field of the middle multiple winding cylinders, so the telescopic rod can be used to carry the portable magnetic field detection device close to or contact the surface of the winding cylinder, so that the portable magnetic field detection device transmits each magnetic induction intensity data of the surface of each winding of the defect area to the control board, and the control board processes the obtained data. In this embodiment, the reactor defect detection device draws a graph according to the obtained data, and the user determines the specific defect position according to the position of the fluctuations and fluctuations in the graph.

[0060] The excitation signal interface 540 comprises a sinusoidal alternating excitation signal input end 541 and a sinusoidal alternating excitation signal output end 542. The sinusoidal alternating excitation signal input end 541 is connected to one end of the dry-type air-core reactor terminal block, and the sinusoidal alternating excitation signal output end 542 is connected to the other end of the dry-type air-core reactor terminal block. The control panel sets the value of the relevant parameters of the excitation signal, and inputs the excitation signal into the dry-type air-core reactor through the excitation signal interface 540 to form a loop, thereby generating a magnetic field in the dry-type air-core reactor, so that the magnetic field monitoring sensor can detect the magnetic field strength of the dry-type air-core reactor. In this embodiment, the excitation signal is an adjustable frequency sinusoidal alternating excitation signal with a current effective value of 20 A, a voltage effective value of 20 V, and a frequency adjustment range of 1 Hz-10000 Hz.

[0061] The interaction device 550 comprises a display screen 551 and function keys 552. The display screen 551 is used to display the detected data, three-dimensional B distribution map and other information. The function keys 552 are used to input instructions to the control panel, so that the control panel performs corresponding operations to realize the functions of adjusting information, selecting functions and calling data, such as adjusting and selecting pages, setting and adjusting the time, date, test item and other contents in the instrument, viewing, storing and deleting the saved data of the instrument, and outputting the excitation signal of the instrument. In addition, the dry-type air-core reactor defect detection device is also provided with a grounding port 560 for ensuring the safety of the dry-type air-core reactor defect detection device and the tester during testing.

[0062] Those skilled in the art can understand that, Figure 5 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the reactor defect detection device to which the scheme of the present application is applied. The specific reactor defect detection device can comprise more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0063] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0064] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0065] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for detecting defects in a dry-type air-core reactor, characterized in that, The method includes: An excitation signal is applied to a dry-type air-core reactor to obtain the magnetic field strength detected by a magnetic field monitoring sensor on the dry-type air-core reactor; the magnetic field monitoring sensor is distributed on the inner and outer surfaces of the dry-type air-core reactor. Based on the magnetic field strength detected by the magnetic field monitoring sensor when the magnetic field strength is at its maximum, a three-dimensional B-distribution map of the induced magnetic field on the surface of the dry air reactor is generated. The defect area is determined based on the location of undulations and fluctuations in the three-dimensional B-distribution map; the dry-type hollow reactor is formed by multiple reactor winding cylinders arranged radially to form an integral superimposed winding cylinder, with the interval between the multiple winding cylinders in the middle being 1cm-1.5cm. By using a telescopic pole to carry a portable magnetic field detection device to approach or contact the defect area on the surface of the winding cylinder, the magnetic field strength of each layer of winding can be detected. The magnetic field strength of each layer of windings in the defect area of ​​the dry-type air-core reactor is obtained by using a portable magnetic field detection device. Defect location analysis is then performed on the defect area to determine the windings with defects in the defect area.

2. The method according to claim 1, characterized in that, The excitation signal is an adjustable sinusoidal AC excitation signal with different frequencies.

3. The method according to claim 2, characterized in that, The frequency range of the sinusoidal AC excitation signal is 1Hz-10000Hz.

4. The method according to claim 1, characterized in that, The method of acquiring the magnetic field strength obtained by the portable magnetic field detection device from the detection of each winding layer in the defect area of ​​the dry-type air-core reactor, and performing defect location analysis on the defect area, includes: The magnetic field strength detected by the portable magnetic field detection device in each winding layer of the defect area of ​​the dry air reactor was obtained. Based on the magnetic field strength detected by the portable magnetic field detection device, a precise three-dimensional B-distribution map of the induced magnetic field of each layer of winding in the defect area of ​​the dry-type air-core reactor is generated; the precise three-dimensional B-distribution map is used to determine the windings of the dry-type air-core reactor that have defects.

5. A defect detection device for dry-type air-core reactors, characterized in that, The device includes: A magnetic field detection module is used to apply an excitation signal to a dry-type air-core reactor and obtain the magnetic field strength detected by the magnetic field monitoring sensor on the dry-type air-core reactor; the magnetic field monitoring sensor is distributed on the inner and outer surfaces of the dry-type air-core reactor; The map plotting module is used to generate a three-dimensional B-distribution map of the induced magnetic field on the surface of the dry air reactor based on the magnetic field strength detected by the dry air reactor when the magnetic field strength is at its maximum. The specific positioning module is used to determine the defect area based on the location of undulations and fluctuations in the three-dimensional B-distribution map. The dry-type hollow reactor consists of multiple reactor winding cylinders arranged radially to form an integrally superimposed winding cylinder, with the interval between the intermediate multi-stage winding cylinders being 1cm-1.5cm. A portable magnetic field detection device is carried by a telescopic rod to approach or contact the defect area on the surface of the winding cylinder to detect the magnetic field strength of each layer of windings. The magnetic field strength obtained by the portable magnetic field detection device in detecting the windings of each layer of the defect area of ​​the dry-type hollow reactor is obtained, and the defect area is analyzed to determine the windings with defects in the defect area.

6. A defect detection system for dry-type air-core reactors, characterized in that, include: The reactor defect detection device, the portable magnetic field detection device, and the magnetic field monitoring sensor are distributed on the inner and outer surfaces of the dry-type air-core reactor; The reactor defect detection device communicates wirelessly with the magnetic field monitoring sensor, and is also connected to the portable magnetic field detection device; the reactor defect detection device is used to perform defect detection on the dry-type air-core reactor according to the method of any one of claims 1-4.

7. The dry-type air-core reactor defect detection system according to claim 6, characterized in that, The reactor defect detection device and the magnetic field monitoring sensor communicate wirelessly via at least one of Bluetooth, WiFi, and the 433MHz broadcast band.

8. The dry-type air-core reactor defect detection system according to claim 6, characterized in that, The magnetic field monitoring sensors are uniformly fixed in an equally spaced array on the inner and outer surfaces of the dry-type air reactor.

9. The dry-type air-core reactor defect detection system according to claim 8, characterized in that, The magnetic field monitoring sensor is fixed to the dry-type air reactor by pasting or binding.

10. The dry-type air-core reactor defect detection system according to claim 6, characterized in that, The reactor defect detection device includes: a housing, a wireless communication unit, a portable magnetic field probe interface, an excitation signal interface, an interaction device, and a control board. The control board is disposed inside the housing. The wireless communication unit, the portable magnetic field probe interface, the excitation signal interface, and the interaction device are all disposed on the outer surface of the housing and connected to the control board. The wireless communication unit communicates wirelessly with the magnetic field monitoring sensor. The control board is connected to the portable magnetic field detection device through the portable magnetic field probe interface.

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