WO2024027455A1 - Procédé et appareil d'identification de spectre d'arc - Google Patents

Procédé et appareil d'identification de spectre d'arc Download PDF

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Publication number
WO2024027455A1
WO2024027455A1 PCT/CN2023/106109 CN2023106109W WO2024027455A1 WO 2024027455 A1 WO2024027455 A1 WO 2024027455A1 CN 2023106109 W CN2023106109 W CN 2023106109W WO 2024027455 A1 WO2024027455 A1 WO 2024027455A1
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Prior art keywords
arc
light intensity
spectrum
wavelength
measurement points
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PCT/CN2023/106109
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English (en)
Chinese (zh)
Inventor
丁心志
赛俊聪
申加旭
李明
许守东
沈鑫
刘斌
李黎
李达义
刘应洁
丁永胜
杨文睿
金琦
王清
赖翔
崔林
刘友宽
章云江
王雪晋
魏龄
汪威宇
范美位
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云南电力试验研究院(集团)有限公司
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Publication of WO2024027455A1 publication Critical patent/WO2024027455A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Definitions

  • the invention belongs to the technical field of power system relay protection, and specifically relates to an arc spectrum identification method and device.
  • the fault can easily cause serious fire accidents in cable trenches, switch cabinets, and even substations. Due to the unstable initial contact between electricity and the medium, unstable arc combustion, physical and chemical changes of the medium, etc., the ground fault current has a certain degree of randomness in the arc fault, and the fault current has nonlinear distortion. This feature has been widely recognized by researchers. This distortion is mainly due to the nonlinearity of impedance and medium during the arc burning process.
  • the feeder zero sequence protection will operate smoothly to trip the line, but the action time is long (more than 3s). If the faulted line cannot be removed in time, the line will Causing great personal safety risks, on May 10, 2019, a 10kV combined transformer (oil-immersed type) of a power supply bureau of China Southern Power Grid exploded and caught fire. The line protection device acted too slowly and failed to cut off the power supply in time, eventually killing 2 people. Fatal accidents teach extremely tragic lessons. With the demand for electrical fire and personal protection, arc protection technology has developed rapidly. GB/T 14598.302-2016 "Technical Requirements for Arc Protection Devices" proposes an action time for arc protection devices in distribution systems to remove arc faults within 20ms.
  • Arc protection logic There are two methods: arc light single criterion and arc light and current double criterion. The dual criterion is currently used more often.
  • the action logic of the protection device is shown in Figure 2.
  • Arc probes and current sensors are installed in many places. The arc sensor is installed on the busbar. On the side, the current sensor is installed at the incoming line, and the "AND" operation is directly taken as the exit signal. Due to the limits of the arc protection logic and the user's arc protection, the outlet trip signal is generally sent to the incoming circuit breaker, which expands the scope of the power outage and affects the reliability of the power supply.
  • patent ZL201310038256.7 name: A high-precision electrical signal measurement equipment device and method, which mainly provides the compensation identification and control measurement method of electrical signals, but does not provide an accurate identification method of the spectrum; patent ZL201610945569.4, name : An arc protection device and its fault diagnosis method, which also collects corresponding voltage and current signals to prepare the arc fault diagnosis method, and does not involve spectrum Information.
  • the arc spectrum signal collected by the sensor is shown in Figure 3. It generally includes two parameters, x is the wavelength, and y is the light intensity. Corresponding to different spectral wavelengths of the arc, there are x 1 ... x n and different arc intensities. , then there is y 1 ...y n .
  • the purpose of the present invention is to solve the shortcomings of the existing technology, provide an arc spectrum identification method and device, overcome the problem of low reliability of the existing arc spectrum identification method, and solve the problem of accurate measurement of spectrum in the presence of light interference sources. problem and improve the accuracy of spectral detection.
  • An arc spectrum identification method includes the following steps:
  • Step (1) measure the arc caused by the short circuit through an arc sensor, and obtain the arc spectrum numerical curve
  • Step (2) Sort the measured values of the arc spectrum light intensity in descending order from large to small, and find the n measurement points of the wavelength spectrum with the top order of light intensity.
  • the wavelengths of the n measurement points are x 1 , x 2 ,...x n
  • the light intensity is y 1 , y 2 ,...y n in sequence;
  • Step (3) calculate the Euclidean distance between the measurement points of the n wavelength spectra obtained in step (2);
  • Step (4) according to the objective function Minimize and perform iterative calculations until the y i corresponding to the minimum S is found;
  • y j D represents the light intensity value at the D-th iteration, where the initial value of y j D is set to the maximum light intensity value among n wavelength spectrum measurement points; then in each iteration, n wavelengths are taken The light intensity in the spectrum measurement point is greater than the light intensity value of any measurement point in dc; cd i is the light intensity of the i-th arc measurement point; d ij is the European formula of wavelengths x i and x j in the n wavelength spectrum measurement points distance, dc is the spectral measurement point light intensity Cutoff threshold; ⁇ is the conversion coefficient between wavelength and light intensity at the measurement point; D is the number of iterations;
  • Step (5) when the light intensity yi obtained in step (4) is greater than or equal to the set light intensity threshold, it is determined that an arc short circuit has occurred, otherwise no arc short circuit has occurred.
  • the value of n is 20 times or more the number of measurement points where the light intensity is greater than the cutoff threshold; the wavelength spacing of different measurement points is the resolution of the light intensity measurement points.
  • step (3) it is assumed that the wavelengths of the n wavelength spectrum measurement points are x 1 , x 2 ,...x n in sequence, and the light intensities are y 1 , y 2 ,...y n in sequence;
  • the value range of dc is [dc minimum value, dc maximum value], where the dc maximum value is the maximum wavelength of the arc spectrum minus the minimum wavelength, and the minimum value is the maximum dc value. (2-10)%.
  • dc is the maximum wavelength of the arc spectrum minus 20% of the minimum wavelength.
  • the light intensity threshold is not lower than the maximum value of the arc light intensity perceived by the naked eye.
  • the light intensity threshold is 5000Lux-10000Lux in an indoor closed space and 15000Lux-40000Lux in an outdoor environment.
  • the invention also provides an arc spectrum identification device, which includes an arc sensor and an identification system.
  • the arc sensor measures the arc caused by the short circuit, obtains the arc spectrum, and transmits it to the identification system;
  • the identification system includes:
  • the first processing module is used to sort the measured values of the arc spectrum light intensity in descending order from large to small, and find the n measurement points of the wavelength spectrum with the top light intensity sorting.
  • the wavelengths of the n measurement points are x 1 in order. , x 2 ,...x n , the light intensity is y 1 , y 2 ,...y n in sequence;
  • the second processing module is used to calculate the Euclidean distance between the measurement points of the obtained n wavelength spectra;
  • the third processing module is used to follow the objective function Minimize and perform iterative calculations until the y i corresponding to the minimum S is found;
  • y j D represents the light intensity value at the D-th iteration, where the initial value of y j D is set to the maximum light intensity value among n wavelength spectrum measurement points; then in each iteration, n wavelengths are taken The light intensity in the spectrum measurement point is greater than the light intensity value of any measurement point in dc; cd i is the light intensity of the i-th arc measurement point; d ij is the European formula of wavelengths x i and x j in the n wavelength spectrum measurement points Distance, dc is the cutoff threshold of light intensity at the spectrum measurement point; ⁇ is the conversion coefficient between wavelength and light intensity at the measurement point;
  • the arc short circuit determination module is used to determine that an arc short circuit has occurred when the light intensity yi obtained by the third processing module is greater than or equal to the set light intensity threshold; otherwise, no arc short circuit has occurred.
  • the present invention also provides an electronic device, which includes a memory, a processor and a computer program stored in the memory and executable on the processor.
  • the feature is that when the processor executes the program, the above arc spectrum identification method is implemented. step.
  • the present invention further provides a non-transitory computer-readable storage medium on which a computer program is stored.
  • a computer program is stored on which a computer program is stored.
  • step (1) of the present invention the arc caused by the short circuit is measured by the arc sensor to obtain the arc spectrum numerical curve; then the maximum spectral wavelength point and the minimum spectral wavelength point of the arc in the arc spectrum numerical curve can be determined; according to the measurement range of the arc spectrum sensor , the maximum spectrum wavelength point is the upper limit of the arc spectrum sensor's maximum measurement range; the minimum spectrum wavelength point is the lower limit of the arc spectrum sensor's minimum measurement range.
  • step (3) of the present invention the yi corresponding to the minimum value of the objective function is the accurate value yi of the wavelength output light intensity of the arc spectrum.
  • ⁇ is the conversion coefficient between the wavelength of the measurement point and the light intensity, and its value is 5000-20000, preferably 10000. Does this invention place no limit on the number of iterations D?
  • the light intensity threshold is preferably 5000Lux-10000Lux in an indoor closed space and 15000Lux-40000Lux in an outdoor environment. Since the light intensity will attenuate during the optical fiber transmission process, the above preferred values given by the present invention are normalized, that is, they are equivalent when the optical fiber length is 1 m.
  • the measurement of the arc is not affected by the spectrum of external light sources or interference sources. Correctly identify and output the characteristic wavelength of the arc and the corresponding light intensity.
  • the present invention determines that an arc short circuit has occurred, it outputs a control signal to the upper-level monitoring and early warning system or device, and then displays "alarm” and “trip” signals in the upper-level monitoring and early warning system or device, which facilitates monitoring of the early warning system or device. Manually further judge or directly switch on the circuit breaker action loop.
  • the method of the invention has accurate measurement, fast action speed, strong scalability, high reliability and high cost performance. Especially in the presence of interference sources (200nm-1500nm) such as fluorescent lamps, the characteristic wavelength of the spectrum can still be accurately identified, and the identification accuracy is high. Improved by 18%-25%.
  • the existing switch cabinet is equipped with an arc protection device, since short circuit identification is more accurate than the existing traditional arc protection device, it will help to make the operation of the existing switch cabinet more reliable and safer.
  • the conversion coefficient ⁇ between the wavelength of the arc measurement point and the light intensity increases the recognition accuracy by 18%-25%.
  • ⁇ takes a value of 10,000 the recognition accuracy can be steadily increased by 25%.
  • Figure 1 is a flow chart of the arc spectrum identification method of the present invention
  • FIG. 2 Traditional high-performance arc protection method; where Td represents a time relay, ⁇ 1 represents a logical OR, & represents a logical AND;
  • Figure 4 is a schematic structural diagram of the arc spectrum identification device of the present invention.
  • Figure 5 is a schematic structural diagram of the electronic equipment of the present invention.
  • the present invention proposes a new arc spectrum identification method based on the conventional arc light monitoring method, which can For high-performance arc monitoring applications.
  • the arc spectrum signal collected by the sensor is shown in Figure 3. It generally includes two parameters, x is the wavelength, and y is the light intensity. Corresponding to different spectral wavelengths of the arc, there are x 1 ... x n and different arc intensities. , then there are y 1 ...y n . Due to the interference from external light sources (such as sunlight, indoor lighting sources) when the arc occurs, it is difficult to accurately determine the occurrence of the arc, and there is even a risk of misjudgment.
  • the present invention proposes a A method and device for accurately identifying arc spectrum.
  • An arc spectrum identification method includes the following steps:
  • Step (1) measure the arc caused by the short circuit through an arc sensor, and obtain the arc spectrum numerical curve
  • Step (2) Sort the measured values of the arc spectrum light intensity in descending order from large to small, and find the n measurement points of the wavelength spectrum with the top order of light intensity.
  • the wavelengths of the n measurement points are x 1 , x 2 ,...x n
  • the light intensity is y 1 , y 2 ,...y n in sequence;
  • Step (3) calculate the Euclidean distance between the measurement points of the n wavelength spectra obtained in step (2);
  • Step (4) according to the objective function Minimize and perform iterative calculations until the y i corresponding to the minimum S is found;
  • y j D represents the light intensity value at the D-th iteration, where the initial value of y j D is set to n wavelengths The maximum value of the light intensity in the spectrum measurement point; then in each iteration, take the light intensity value of any measurement point where the light intensity in the n wavelength spectrum measurement points is greater than dc; cd i is the light of the i-th arc measurement point Intensity; d ij is the Euclidean distance between wavelengths x i and x j in n wavelength spectrum measurement points, dc is the cutoff threshold of light intensity at the spectrum measurement point; ⁇ is the conversion coefficient between wavelength and light intensity at the measurement point; D is the number of iterations;
  • Step (5) when the light intensity yi obtained in step (4) is greater than or equal to the set light intensity threshold, it is determined that an arc short circuit has occurred, otherwise no arc short circuit has occurred.
  • step (2) the value of n is 20 times or more the number of measurement points where the light intensity is greater than the cutoff threshold; the wavelength spacing of different measurement points is the resolution of the light intensity measurement points.
  • step (3) assume that the wavelengths of n wavelength spectrum measurement points are x 1 , x 2 ,...x n in sequence, and the light intensities are y 1 , y 2 ,...y n in sequence;
  • the value range of dc is [dc minimum value, dc maximum value], where the dc maximum value is the maximum wavelength of the arc spectrum minus the minimum wavelength, and the minimum value is (2-10)% of the dc maximum value .
  • step (4) dc is the maximum wavelength of the arc spectrum minus 20% of the minimum wavelength.
  • the light intensity threshold shall not be lower than the maximum value of the arc light intensity perceived by the naked eye.
  • the light intensity threshold is 5000Lux-10000Lux in indoor enclosed spaces and 15000Lux-40000Lux in outdoor environments.
  • the present invention uses relevant iterations on the light intensity cd i of any wavelength. Traverse all measurement points until the minimum value of the objective function is found, which is the characteristic wavelength of the arc spectrum.
  • the light intensity corresponding to the characteristic wavelength is the accurate light intensity of the arc.
  • an arc spectrum identification device is characterized by: including an arc sensor 101 and an identification system.
  • the arc sensor measures the arc caused by the short circuit, obtains the arc spectrum, and transmits it to the identification system;
  • the identification system includes:
  • the first processing module 102 is used to sort the measured values of the arc spectrum light intensity in descending order from large to small, and find the n measurement points of the wavelength spectrum with the top order of light intensity.
  • the wavelengths of the n measurement points are x in order. 1 , x 2 ,...x n , the light intensity is y 1 , y 2 ,...y n in sequence;
  • the second processing module 103 is used to calculate the Euclidean distance between the measurement points of the obtained n wavelength spectra;
  • the third processing module 104 is used to perform Minimize and perform iterative calculations until the y i corresponding to the minimum S is found;
  • y j D represents the light intensity value at the D-th iteration, where the initial value of y j D is set to the maximum light intensity value among n wavelength spectrum measurement points; then in each iteration, n wavelengths are taken The light intensity in the spectrum measurement point is greater than the light intensity value of any measurement point in dc; cd i is the light intensity of the i-th arc measurement point; d ij is the European formula of wavelengths x i and x j in the n wavelength spectrum measurement points Distance, dc is the cutoff threshold of light intensity at the spectrum measurement point; ⁇ is the conversion coefficient between wavelength and light intensity at the measurement point; D is the number of iterations;
  • the arc short circuit determination module 105 is used to determine that an arc short circuit has occurred when the light intensity yi obtained by the third processing module is greater than or equal to the set light intensity threshold; otherwise, no arc short circuit has occurred.
  • FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention.
  • the electronic device may include: a processor (processor) 201, a communications interface (Communications Interface) 202, a memory (memory) 203 and a communication bus 204, where , the processor 201, the communication interface 202, and the memory 203 complete communication with each other through the communication bus 204.
  • the processor 201 can call logical instructions in the memory 203 to perform the following methods:
  • the wavelengths of the n measurement points are x 1 , x 2 ,...x n , the light intensity is y 1 , y 2 ,...y n in sequence;
  • y j D represents the light intensity value at the D-th iteration, where the initial value of y j D is set to the maximum light intensity value among n wavelength spectrum measurement points; then in each iteration, n wavelengths are taken The light intensity in the spectrum measurement point is greater than the light intensity value of any measurement point in dc; cd i is the light intensity of the i-th arc measurement point; d ij is the European formula of wavelengths x i and x j in the n wavelength spectrum measurement points Distance, dc is the cutoff threshold of light intensity at the spectrum measurement point; ⁇ is the conversion coefficient between wavelength and light intensity at the measurement point; D is the number of iterations;
  • the above-mentioned logical instructions in the memory 203 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.
  • the technical solution of the present invention essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program code. .
  • embodiments of the present invention also provide a non-transitory computer-readable storage medium on which a computer program is stored.
  • the computer program is implemented when executed by a processor to execute the arc spectrum identification method provided by the above embodiments. Examples include:
  • the wavelengths of the n measurement points are x 1 , x 2 ,...x n , light intensity
  • the degrees are y 1 , y 2 ,...y n ;
  • y j D represents the light intensity value at the D-th iteration, where the initial value of y j D is set to the maximum light intensity value among n wavelength spectrum measurement points; then in each iteration, n wavelengths are taken The light intensity in the spectrum measurement point is greater than the light intensity value of any measurement point in dc; cd i is the light intensity of the i-th arc measurement point; d ij is the European formula of wavelengths x i and x j in the n wavelength spectrum measurement points Distance, dc is the cutoff threshold of light intensity at the spectrum measurement point; ⁇ is the conversion coefficient between wavelength and light intensity at the measurement point;
  • the device embodiments described above are only illustrative.
  • the units described as separate components may or may not be physically separated.
  • the components shown as units may or may not be physical units, that is, they may be located in One location, or it can be distributed across multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Persons of ordinary skill in the art can understand and implement the method without any creative effort.
  • each embodiment can be implemented by software plus a necessary general hardware platform, and of course, it can also be implemented by hardware.
  • the computer software product can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., including a number of instructions to cause a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments.
  • a certain arc spectrum identification curve is shown in Figure 3.
  • dc indicates that the truncation threshold of the light intensity of the spectrum measurement point is (15000-40000) Lux. In this example, 20000 Lux is taken.
  • the measurement wavelength is 820nm
  • the minimum measurement wavelength is 200nm
  • the spectral wavelength measurement resolution is 2nm
  • all measurement points are 310.
  • ⁇ is the conversion coefficient between the wavelength and light intensity of the measurement point, with a value of 10000.
  • the minimum objective function is identified
  • the characteristic wavelength of the arc spectrum is found to be 426nm.
  • the corresponding light intensity is 28400Lux, which is greater than the light intensity threshold.
  • the light intensity threshold is 25000Lux, which proves that an arc short circuit has occurred at this time, so the arc short circuit control signal is output.
  • this light intensity threshold is different with and without external light source interference. With external light source interference, the light intensity threshold is 2 times greater than the light intensity threshold without external light source interference. times and above.
  • the light intensity threshold for judging whether a short circuit actually occurs is related to the attenuation of the optical fiber, and needs to be calibrated according to the length of the optical fiber during installation and delivery. (Additional).

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  • General Physics & Mathematics (AREA)
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Abstract

La présente invention concerne un procédé et un appareil d'identification de spectre d'arc, qui se rapportent au domaine technique de la protection de relais de système d'alimentation. Dans le procédé, un spectre intrinsèque d'un arc électrique est rapidement identifié en utilisant une distance euclidienne, en réduisant au minimum une fonction cible et en utilisant un procédé de troncature de seuil spectral ; et un signal est ensuite envoyé à un appareil de commande de protection, de sorte que l'appareil de commande de protection délivre des signaux d'alarme et de déclenchement de manière pratique. Au moyen du procédé, une vitesse d'action élevée, un montage et un débogage pratiques, une extensibilité élevée, une fiabilité élevée et d'excellentes performances de coût sont obtenues. L'appareil d'identification de spectre d'arc est développé selon un procédé d'identification de spectre d'arc, et en particulier, après montage supplémentaire d'un appareil d'identification de spectre de ce type sur une armoire de commutation existante, l'armoire de commutation existante peut fonctionner de manière plus fiable et plus sûre.
PCT/CN2023/106109 2022-08-01 2023-07-06 Procédé et appareil d'identification de spectre d'arc WO2024027455A1 (fr)

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CN110441647A (zh) * 2019-09-06 2019-11-12 云南电网有限责任公司电力科学研究院 基于光谱强度信息的弧光危险评估方法及装置
CN110794326A (zh) * 2019-09-26 2020-02-14 昆明理工大学 一种配电系统短路保护的选线方法、装置及其系统
CN114966472A (zh) * 2022-08-01 2022-08-30 云南电力试验研究院(集团)有限公司 一种电弧光谱识别方法和装置

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