Method and device for detecting and positioning partial discharge of switch cabinet based on UHF (Ultra High Frequency) sensor array

Abstract

The invention relates to a switch cabinet partial discharge detecting and positioning method and device based on a UHF sensor array. The method comprises the steps that starting signals are sent to sensors belonging to the same monitoring team; determining a propagation path of the current signal to obtain a propagation route; displaying each propagation route on the three-dimensional image and obtaining an intersection point of the routes; determining a surrounding area of the plurality of intersection points and obtaining a central point of the surrounding area; calculating the length of each propagation route by taking the central point as a starting point center; and eliminating the propagation routes which do not accord with the line loss, regenerating the surrounding area by using the remaining propagation routes, and obtaining a central point of the surrounding area. According to the switch cabinet partial discharge detection positioning method and device based on the UHF sensor array disclosed by the invention, the received current signal can be processed, so that the fault position or defect position in the cabinet body is determined, and a reference basis is provided for use, maintenance and the like of the switch cabinet.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a switch cabinet partial discharge detection and positioning method and device based on a UHF sensor array. Background Art

[0002] During the assembly, transportation and long-term operation of the switch cabinet, metal electrical components or insulation parts inside the switch cabinet may have defects due to manufacturing or long-term operation. These defects will cause partial discharge when the electric field is unevenly distributed. Partial discharge will produce a vicious cycle and eventually break through the entire insulation medium, causing electrical equipment failure.

[0003] Partial discharge is an important indicator of insulation degradation in high-voltage electrical equipment, and is also an important cause of insulation breakdown in the equipment. Therefore, detecting and locating the source of partial discharge is an effective means to avoid insulation breakdown failures. Partial discharge will be transmitted to the cabinet, so the discharge position can be located with the help of the current on the cabinet. The discharge position can be located through the matrix current signal detection method, but how to process the received current signal requires further research. Summary of the invention

[0004] The present invention provides a switch cabinet partial discharge detection and positioning method and device based on a UHF sensor array, which can process the received current signal to determine the fault location or defect location inside the cabinet, and provide a reference basis for the use and maintenance of the switch cabinet.

[0005] The above object of the present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a switch cabinet partial discharge detection and positioning method based on a UHF sensor array, comprising: In response to the acquired current signal, a start signal is sent to sensors belonging to the same monitoring team; Each sensor determines the propagation path of the current signal according to the received current signal to obtain the propagation route; Display each propagation route on the three-dimensional image and obtain the intersection points of the routes, where the number of the intersection points is at least one; Determine the enclosed area of ​​multiple intersection points and obtain the center point of the enclosed area; Calculate the length of each propagation route with the center point as the starting point; Calculate the line loss of each propagation path based on the length of the propagation path; Calibrate the current signal received by the sensor corresponding to each propagation route according to the line loss, and eliminate the propagation routes that do not meet the line loss; and The enclosed area is regenerated using the remaining propagation paths and the center point of the enclosed area is obtained, until the regenerated center point coincides with the center point obtained before the regeneration.

[0006] In a possible implementation manner of the first aspect, when the area value of the enclosed region is greater than the area allowance threshold, a standard graph is used to screen intersections in the enclosed region; Intersection points outside the standard shape are discarded.

[0007] In a possible implementation of the first aspect, during the intersection screening process, the standard area graphic moves within the enclosed area; When the standard area figure stops moving, the most intersection points are located inside the standard figure.

[0008] In a possible implementation manner of the first aspect, the standard area graphic has multiple shapes.

[0009] In a possible implementation of the first aspect, for the acquired current signal, after obtaining the waveform of the current signal, the waveform is decomposed into a plurality of standard waveforms with different frequencies and amplitudes; The acquired current signals are grouped according to standard waveforms.

[0010] In a possible implementation of the first aspect, grouping the acquired current signals according to the standard waveform includes calculating the proportion of the same standard waveform in two current signals in all standard waveforms, and when the proportion exceeds a set threshold, it is considered that the two current signals are generated based on the same signal source.

[0011] In a possible implementation manner of the first aspect, when the frequencies of the standard waveforms are the same, line loss is introduced to correct the amplitude of the standard waveforms.

[0012] In a second aspect, the present invention provides a switch cabinet partial discharge detection and positioning device based on a UHF sensor array, comprising: A communication unit, configured to send a start signal to sensors belonging to the same monitoring team in response to the acquired current signal; A first processing unit, configured for each sensor to determine a propagation path of the current signal according to the received current signal to obtain a propagation route; A second processing unit is used to display each propagation route on the three-dimensional image and obtain an intersection point of the route, where the number of the intersection point is at least one; A third processing unit is used to determine an enclosed area of ​​the plurality of intersection points and obtain a center point of the enclosed area; A fourth processing unit is used to calculate the length of each propagation route with the center point as the starting point; A calculation unit, used for calculating the line loss of each propagation route according to the length of the propagation route; A calibration unit, used to calibrate the current signal received by the sensor corresponding to each propagation route according to the line loss, and eliminate the propagation routes that do not meet the line loss; and The verification unit is used to regenerate the enclosed area using the remaining propagation routes and obtain the center point of the enclosed area, until the regenerated center point coincides with the center point obtained before the regeneration.

[0013] In a third aspect, the present invention provides a switch cabinet partial discharge detection and positioning system based on a UHF sensor array, the system comprising: one or more memories for storing instructions; and One or more processors, used to call and run the instructions from the memory to execute the method as described in the first aspect and any possible implementation of the first aspect.

[0014] In a fourth aspect, the present invention provides a computer-readable storage medium, the computer-readable storage medium comprising: Program, when the program is executed by a processor, the method described in the first aspect and any possible implementation of the first aspect is executed.

[0015] In a fifth aspect, the present invention provides a computer program product, comprising program instructions, and when the program instructions are executed by a computing device, the method described in the first aspect and any possible implementation of the first aspect is executed.

[0016] In a sixth aspect, the present invention provides a chip system comprising a processor for implementing the functions involved in the above aspects, for example, generating, receiving, sending, or processing the data and / or information involved in the above methods.

[0017] The chip system may be composed of chips, or may include chips and other discrete devices.

[0018] In a possible design, the chip system also includes a memory, which is used to store necessary program instructions and data. The processor and the memory can be decoupled and respectively set on different devices, connected by wired or wireless means, or the processor and the memory can also be coupled on the same device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic block diagram of the steps of a detection and positioning method provided by the present invention.

[0020] Figure 2It is a schematic diagram of the distribution of sensors provided by the present invention on a cabinet.

[0021] Figure 3 is based on Figure 2 The expanded schematic diagram of the cabinet is given.

[0022] Figure 4 It is a schematic diagram of a transmission route on a cabinet provided by the present invention.

[0023] Figure 5 It is a schematic diagram of an enclosed area on a cabinet provided by the present invention. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0025] The present invention discloses a switch cabinet partial discharge detection and positioning method based on a UHF sensor array. Figure 1 , the method comprises the following steps S101, in response to the acquired current signal, sending a start signal to sensors belonging to the same monitoring team; S102, each sensor determines a propagation path of the current signal according to the received current signal to obtain a propagation route; S103, displaying each propagation route on the three-dimensional image and obtaining intersection points of the routes, where the number of intersection points is at least one; S104, determining an enclosed area of ​​the plurality of intersection points and obtaining a center point of the enclosed area; S105, calculating the length of each propagation route with the center point as the starting point; S106, calculating the line loss of each propagation path according to the length of the propagation path; S107, calibrating the current signal received by the sensor corresponding to each propagation route according to the line loss, and eliminating the propagation route that does not meet the line loss requirement; and S108, using the remaining propagation routes to regenerate the enclosed area and obtain the center point of the enclosed area, until the regenerated center point coincides with the center point obtained before the regeneration.

[0026] In the above steps, it is necessary to first determine the propagation path of the current signal. The propagation path here refers to the direction. Please refer to Figures 2 to 4 However, there are multiple location points in one direction at the same time, so it is necessary to use sensors belonging to the same monitoring team to determine the location. The way to determine the location is to display multiple propagation paths on a certain object (cabinet), then get the intersection of the routes, and finally correct the intersection of the routes.

[0027] For the enclosed area mentioned above, such as Figure 5 As shown (the pentagon in the figure does not take into account the area), the present invention uses an allowable threshold for further processing. Specifically, when the area value of the enclosed area is greater than the area allowable threshold, a standard graphic is used to filter the intersections in the enclosed area, and the intersections outside the standard graphic are discarded.

[0028] The purpose of this is to limit the area of ​​the enclosed area. During the process of selecting intersections, the standard area graphic moves in the enclosed area. When the standard area graphic stops moving, the most intersections are located in the standard graphic.

[0029] At the same time, the standard area figure has multiple shapes. In the moving process described in the above content, each shape of the standard area figure will move.

[0030] In some examples, after obtaining the waveform of the current signal, the waveform is decomposed into a plurality of standard waveforms with different frequencies and amplitudes, and the obtained current signal is grouped according to the standard waveforms.

[0031] Here we mainly consider the possibility of different signal sources, and the specific grouping method is as follows: The acquired current signals are grouped according to the standard waveforms, including calculating the proportion of the same standard waveform in the two current signals in all the standard waveforms. When the proportion exceeds a set threshold, it is considered that the two current signals are generated based on the same signal source.

[0032] At the same time, when the frequency of the standard waveform is the same, the line loss is introduced to correct the amplitude of the standard waveform, because the line loss will cause the amplitude of the waveform to decrease.

[0033] The present invention also provides a switch cabinet partial discharge detection and positioning device based on a UHF sensor array, comprising: A communication unit, configured to send a start signal to sensors belonging to the same monitoring team in response to the acquired current signal; A first processing unit, configured for each sensor to determine a propagation path of the current signal according to the received current signal to obtain a propagation route; A second processing unit is used to display each propagation route on the three-dimensional image and obtain an intersection point of the route, where the number of the intersection point is at least one; A third processing unit is used to determine an enclosed area of ​​the plurality of intersection points and obtain a center point of the enclosed area; A fourth processing unit is used to calculate the length of each propagation route with the center point as the starting point; A calculation unit, used for calculating the line loss of each propagation route according to the length of the propagation route; A calibration unit, used to calibrate the current signal received by the sensor corresponding to each propagation route according to the line loss, and eliminate the propagation routes that do not meet the line loss; and The verification unit is used to regenerate the enclosed area using the remaining propagation routes and obtain the center point of the enclosed area, until the regenerated center point coincides with the center point obtained before the regeneration.

[0034] In one example, the unit in any of the above devices can be one or more integrated circuits configured to implement the above methods, such as: one or more application specific integrated circuits (ASICs), or, one or more digital signal processors (DSPs), or, one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms.

[0035] For another example, when the units in the device can be implemented in the form of a processing element scheduling program, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call a program. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0036] Various objects such as various messages / information / equipment / network elements / systems / devices / actions / operations / processes / concepts that may appear in the present invention are named. It can be understood that these specific names do not constitute a limitation on the relevant objects. The names assigned may change with factors such as scenarios, contexts or usage habits. The understanding of the technical meaning of the technical terms in the present invention should be mainly determined from the functions and technical effects embodied / executed in the technical scheme.

[0037] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0038] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0039] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0040] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0041] It should also be understood that in various embodiments of the present invention, the first, second, etc. are only used to indicate that multiple objects are different. For example, the first time window and the second time window are only used to indicate different time windows. They should not have any impact on the time window itself, and the first, second, etc. mentioned above should not impose any limitations on the embodiments of the present invention.

[0042] It should also be understood that in the various embodiments of the present invention, unless otherwise specified or there is any logical conflict, the terms and / or descriptions between the different embodiments are consistent and can be referenced to each other, and the technical features in the different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0043] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a computer-readable storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned computer-readable storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0044] The present invention also provides a switch cabinet partial discharge detection and positioning system based on a UHF sensor array, the system comprising: one or more memories for storing instructions; and One or more processors are used to call and run the instructions from the memory to execute the method as described above.

[0045] The present invention also provides a computer program product, which includes instructions. When the instructions are executed, the switch cabinet partial discharge detection and positioning system performs operations of the switch cabinet partial discharge detection and positioning system corresponding to the above method.

[0046] The present invention also provides a chip system, which includes a processor for implementing the functions involved in the above content, such as generating, receiving, sending, or processing the data and / or information involved in the above method.

[0047] The chip system may be composed of chips, or may include chips and other discrete devices.

[0048] The processor mentioned in any of the above places can be a CPU, a microprocessor, an ASIC, or one or more integrated circuits for executing programs for controlling the above-mentioned feedback information transmission method.

[0049] In a possible design, the chip system also includes a memory, which is used to store necessary program instructions and data. The processor and the memory can be decoupled and respectively set on different devices, connected by wire or wireless means to support the chip system to implement various functions in the above embodiments. Alternatively, the processor and the memory can also be coupled on the same device.

[0050] Optionally, the computer instructions are stored in a memory.

[0051] Optionally, the memory is a storage unit within the chip, such as a register, a cache, etc. The memory can also be a storage unit within the terminal located outside the chip, such as a ROM or other types of static storage devices that can store static information and instructions, RAM, etc.

[0052] It can be understood that the memory in the present invention can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories.

[0053] The non-volatile memory may be a ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), or a flash memory.

[0054] The volatile memory may be a RAM, which is used as an external cache. There are many different types of RAM, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct memory bus RAM.

[0055] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A switch cabinet partial discharge detection and positioning method based on a UHF sensor array, characterized in that: include: In response to the acquired current signal, a start signal is sent to sensors belonging to the same monitoring team; Each sensor determines the propagation path of the current signal according to the received current signal to obtain the propagation route; Display each propagation route on the three-dimensional image and obtain the intersection points of the routes, where the number of the intersection points is at least one; Determine the enclosed area of ​​multiple intersection points and obtain the center point of the enclosed area; Calculate the length of each propagation route with the center point as the starting point; Calculate the line loss of each propagation path based on the length of the propagation path; The current signal received by the sensor corresponding to each propagation route is calibrated according to the line loss, and the propagation routes that do not meet the line loss are eliminated; as well as The enclosed area is regenerated using the remaining propagation paths and the center point of the enclosed area is obtained, until the regenerated center point coincides with the center point obtained before the regeneration.

2. The switch cabinet partial discharge detection and positioning method based on UHF sensor array according to claim 1 is characterized in that: When the area value of the enclosed area is greater than the area allowance threshold, the standard graph is used to filter the intersection points in the enclosed area; Intersection points outside the standard shape are discarded.

3. The switch cabinet partial discharge detection and positioning method based on UHF sensor array according to claim 2 is characterized in that: During the process of selecting intersection points, the standard area graph moves within the enclosed area; When the standard area figure stops moving, the most intersection points are located inside the standard figure.

4. The switch cabinet partial discharge detection and positioning method based on UHF sensor array according to claim 3 is characterized in that: Standard area graphics come in several shapes.

5. The switch cabinet partial discharge detection and positioning method based on UHF sensor array according to any one of claims 1 to 4, characterized in that: For the acquired current signal, after obtaining the waveform of the current signal, the waveform is decomposed into a plurality of standard waveforms with different frequencies and amplitudes; The acquired current signals are grouped according to standard waveforms.

6. The switch cabinet partial discharge detection and positioning method based on UHF sensor array according to claim 5 is characterized in that: The acquired current signals are grouped according to the standard waveforms, including calculating the proportion of the same standard waveform in the two current signals in all the standard waveforms. When the proportion exceeds a set threshold, it is considered that the two current signals are generated based on the same signal source.

7. The switch cabinet partial discharge detection and positioning method based on UHF sensor array according to claim 6 is characterized in that: When the frequency of the standard waveform is the same, line loss is introduced to correct the amplitude of the standard waveform.

8. A switch cabinet partial discharge detection and positioning device based on a UHF sensor array, characterized in that: include: A communication unit, configured to send a start signal to sensors belonging to the same monitoring team in response to the acquired current signal; A first processing unit, configured for each sensor to determine a propagation path of the current signal according to the received current signal to obtain a propagation route; A second processing unit is used to display each propagation route on the three-dimensional image and obtain an intersection point of the route, where the number of the intersection point is at least one; A third processing unit is used to determine an enclosed area of ​​the plurality of intersection points and obtain a center point of the enclosed area; A fourth processing unit is used to calculate the length of each propagation route with the center point as the starting point; A calculation unit, used for calculating the line loss of each propagation route according to the length of the propagation route; A calibration unit, used to calibrate the current signal received by the sensor corresponding to each propagation route according to the line loss, and eliminate the propagation routes that do not meet the line loss; as well as The verification unit is used to regenerate the enclosed area using the remaining propagation routes and obtain the center point of the enclosed area, until the regenerated center point coincides with the center point obtained before the regeneration.

9. A switch cabinet partial discharge detection and positioning system based on a UHF sensor array, characterized in that: The system comprises: one or more memories for storing instructions; and One or more processors, configured to call and execute the instructions from the memory to perform the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer readable storage medium comprises: The program, when the program is executed by a processor, the method according to any one of claims 1 to 7 is executed.

Images