A method and system for online identification of operating status of arc extinguishing device

Abstract

The present invention discloses an online identification method and system for the operation status of an arc extinguishing device, the method comprising: judging whether the analyzed frequency is a preset frequency; if it is a preset frequency, using a preset fitting strategy to perform exponential fitting on the upper envelope of zero-sequence voltage data, and judging whether the envelope amplitude within a preset time period is greater than a first preset threshold value, and whether the attenuation time constant is greater than a second preset threshold value; if it is not greater than the first preset threshold value, or not greater than the second preset threshold value, then for the bus connected to the arc extinguishing coil, judging whether the zero-sequence voltage value after the fault disappears is less than a third preset threshold value; if it is less than the third preset threshold value, judging whether the neutral point displacement voltage meets the preset conditions; if it meets the preset conditions, determining that the arc extinguishing coil is operating normally. Exponential fitting and FFT algorithms are proposed to judge the operation status of the arc extinguishing coil, which improves the perception of the operation status of the arc extinguishing coil and reduces the workload of on-site inspection.

Description

Technical Field

[0001] The present invention belongs to the technical field of arc extinguishing device operating status analysis, and in particular relates to an online operating status identification method and system for an arc extinguishing device. Background Art

[0002] At present, the distribution network mainly adopts the operation mode of ungrounded neutral point or grounded through arc suppression coil, which is also called small current grounding system. Among them, most faults are single-phase grounding faults. With the continuous improvement of the cable rate of modern distribution networks and the widespread use of non-linear loads, grounding faults are prone to develop into serious faults such as arc grounding overvoltage. Arc fault is a complex electrical phenomenon caused by unstable current, and its waveform and spectrum characteristics are very complex. Its occurrence is usually sudden and instantaneous, requiring rapid response and processing. Traditional offline analysis methods require a lot of data acquisition and processing time, and cannot meet real-time requirements. Online identification technology can monitor and identify arc fault parameters in real time and provide immediate processing measures.

[0003] The characteristic parameters of arc faults include voltage, current, arc resistance, frequency and other aspects. By analyzing and identifying the relationship between these parameters, the type and location of the arc fault can be effectively determined, and corresponding measures can be taken. However, due to the complex interaction between arc fault parameters, traditional analysis methods face challenges. Online identification technology can establish a more accurate model and improve the accuracy of identification by real-time acquisition and analysis of multiple parameters.

[0004] The existing online identification technology has the following shortcomings: 1. The existing online identification technology often relies on historical data and known models for parameter identification. When facing new faults or system changes, the algorithm needs to be more adaptable to ensure accuracy and reliability; 2. The existing key parameter identification algorithm does not consider the impact of the actual on-site neutral point displacement voltage and detuning degree on the compensation state of the arc suppression coil; 3. The existing algorithm is greatly affected by signal attenuation, resulting in misjudgment of the arc suppression device status diagnosis, resulting in reduced parameter identification accuracy. Summary of the invention

[0005] The present invention provides a method and system for online identification of the operating status of an arc extinguishing device, which are used to solve at least one of the above-mentioned technical problems.

[0006] In a first aspect, the present invention provides a method for online identification of the operating status of an arc extinguishing device, wherein the arc extinguishing device includes an arc extinguishing coil and an active intervention type arc extinguishing system, and the method includes:

[0007] For arc suppression coils, the time from the end of the single-phase grounding fault to the end of the fault is taken backwards. sampling points, if the sampling points are insufficient Then push forward from the last sampling point until you get sampling points, that is, the data length is Zero sequence voltage data;

[0008] Perform FFT analysis on the zero-sequence voltage data and determine the frequency after analysis Whether it is the preset frequency;

[0009] If it is a preset frequency, a preset fitting strategy is used to perform exponential fitting on the upper envelope of the zero-sequence voltage data, and it is determined whether the envelope amplitude within a preset time period is greater than a first preset threshold, and whether the decay time constant is greater than a second preset threshold;

[0010] If the envelope amplitude within the preset time period is not greater than the first preset threshold, or the attenuation time constant is not greater than the second preset threshold, it is determined that there is an arc extinguishing coil connected, and for the bus connected to the arc extinguishing coil, it is determined whether the zero-sequence voltage value after the fault disappears is less than the third preset threshold;

[0011] If it is less than the third preset threshold, determining whether the neutral point displacement voltage meets the preset condition;

[0012] If the preset conditions are met, it is determined that the arc extinguishing coil is operating normally.

[0013] In a second aspect, the present invention provides an online operating status identification system for an arc extinguishing device, wherein the arc extinguishing device comprises an arc extinguishing coil and an active intervention type arc extinguishing system, and the online operating status identification system comprises:

[0014] Select the module and configure it to take the time from the end of the single-phase grounding fault to the end of the single-phase grounding fault. sampling points, if the sampling points are insufficient Then push forward from the last sampling point until you get sampling points, that is, the data length is Zero sequence voltage data;

[0015] An analysis module is configured to perform FFT analysis on the zero-sequence voltage data and determine the frequency after analysis. Whether it is the preset frequency;

[0016] A first judgment module is configured to perform exponential fitting on the upper envelope of the zero-sequence voltage data using a preset fitting strategy if the frequency is a preset frequency, and to judge whether the envelope amplitude within a preset time period is greater than a first preset threshold, and whether the decay time constant is greater than a second preset threshold;

[0017] The second judgment module is configured to determine that there is an arc extinguishing coil connected if the envelope amplitude within a preset time period is not greater than a first preset threshold, or the attenuation time constant is not greater than a second preset threshold, and for the bus connected to the arc extinguishing coil, determine whether the zero-sequence voltage value after the fault disappears is less than a third preset threshold;

[0018] A third judgment module is configured to judge whether the neutral point displacement voltage meets a preset condition if it is less than a third preset threshold;

[0019] The output module is configured to determine that the arc suppression coil is operating normally if the preset conditions are met.

[0020] According to a third aspect, an electronic device is provided, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the steps of the method for online identification of the operating status of an arc extinguishing device according to any embodiment of the present invention.

[0021] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor executes the steps of the method for online identification of the operating status of an arc extinguishing device of any embodiment of the present invention.

[0022] The online identification method and system for the operation status of arc extinguishing devices of the present application are aimed at the problems such as abnormal identification of key parameters of different arc extinguishing devices used in substations, which lead to untimely cutting off of arc extinguishing devices and inaccurate operation. The exponential fitting and FFT algorithms are proposed to judge the operation status of arc extinguishing coils, which improves the perception of the operation status of arc extinguishing coils and reduces the workload of on-site inspections. In addition, a method for diagnosing the effectiveness of active intervention arc extinguishing devices is proposed, which can diagnose whether the active intervention arc extinguishing devices meet the technical standards and substation standards in on-site applications, thereby improving the stability of power grid operation and the safety of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A flow chart of a method for online identification of the operating status of an arc extinguishing device provided by one embodiment of the present invention;

[0025] Figure 2A structural block diagram of an online identification system for the operation status of an arc extinguishing device provided by an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 , which shows a flow chart of a method for online identification of the operating status of an arc extinguishing device of the present application.

[0029] like Figure 1 As shown, the online identification method for the operating status of the arc extinguishing device specifically includes the following steps:

[0030] Step S101: for arc suppression coils, starting from the end time of the single-phase grounding fault, sampling points, if the sampling points are insufficient Then push forward from the last sampling point until you get sampling points, that is, the data length is Zero sequence voltage data;

[0031] Step S102, performing FFT analysis on the zero-sequence voltage data and determining the frequency after analysis Whether it is the preset frequency.

[0032] In a specific embodiment, after determining the frequency of the analysis After checking whether it is the preset frequency, if it is not the preset frequency, the analysis of the operating status of the arc suppression coil will be stopped directly.

[0033] Step S103, if it is a preset frequency, exponentially fit the upper envelope of the zero-sequence voltage data using a preset fitting strategy, and determine whether the envelope amplitude within a preset time period is greater than a first preset threshold, and whether the decay time constant is greater than a second preset threshold.

[0034] In this step, the expression of the fitting strategy is:

[0035] ,

[0036] In the formula, is the decay time constant, is the amplitude coefficient, is the exponential function with natural logarithm as base, For time.

[0037] In a specific embodiment, after determining whether the envelope amplitude within the preset time period is greater than a first preset threshold and whether the decay time constant is greater than a second preset threshold, if the envelope amplitude within the preset time period is greater than the first preset threshold and the decay time constant is greater than the second preset threshold, it is determined that the arc extinguishing coil is not connected.

[0038] Step S104: If the envelope amplitude within the preset time period is not greater than the first preset threshold, or the attenuation time constant is not greater than the second preset threshold, it is determined that an arc extinguishing coil is connected, and for the bus connected to the arc extinguishing coil, it is determined whether the zero-sequence voltage value after the fault disappears is less than the third preset threshold.

[0039] In a specific embodiment, after determining whether the zero-sequence voltage value after the fault disappears is less than a third preset threshold, if it is not less than the third preset threshold, it is determined that the arc extinguishing coil compensation is abnormal and the detuning degree exceeds the limit.

[0040] Step S105: If the voltage is less than the third preset threshold, determine whether the neutral point displacement voltage meets the preset condition.

[0041] In this step, it is determined whether the ratio of the neutral point displacement voltage to the system nominal voltage is less than the fourth preset threshold value; if it is not less than the fourth preset threshold value, it is determined that the arc suppression coil compensation is abnormal and the neutral point displacement voltage exceeds the limit; if it is less than the fourth preset threshold value, it is determined whether the neutral point displacement voltage is less than the fifth preset threshold value; if it is not less than the fifth preset threshold value, it is determined that the arc suppression coil grounding is abnormal; if it is less than the fifth preset threshold value, it is determined that the arc suppression coil is operating normally.

[0042] Step S106: If the preset conditions are met, it is determined that the arc extinguishing coil is operating normally.

[0043] In a specific embodiment, for an active intervention arc suppression system, the input phase switch closing technical standard parameters are And substation phase switch closing standard parameters ,in, is the number of technical standard tests, is the technical standard parameter vector, Respectively represent the first, second to third devices in the technical standard. Action time, is the standard parameter vector of the substation, Respectively represent the first, second, third, and fourth devices in the substation standard. Action time;

[0044] The first Actual action time Technical standard parameters for phase-splitting switch closure The Action time In contrast, if , then determine that the active intervention arc extinguishing system is normal and proceed to the next step; if , then the active intervention arc extinguishing system is determined to be abnormal and exit;

[0045] The first Actual action time Standard parameters for closing phase switches in substations The Action time In contrast, if , then calculate the rapid velocity , and proceed to the next step; if , it is determined that the active intervention arc extinguishing system has timed out, and the next step is carried out;

[0046] Repeat the iterative comparison until the exit condition is met or the technical standard detection times are reached .

[0047] In summary, the method of this application aims to solve the problems of abnormal recognition of key parameters of different arc extinguishing devices used in substations, which leads to untimely cutting off of arc extinguishing devices and inaccurate operation. It proposes exponential fitting and FFT algorithms to judge the operating status of arc extinguishing coils, improves the perception of the operating status of arc extinguishing coils, and reduces the workload of on-site inspections. In addition, a method for diagnosing the effectiveness of active intervention arc extinguishing devices is proposed, which can diagnose whether the active intervention arc extinguishing devices meet the technical standards and substation standards in on-site applications, thereby improving the stability of power grid operation and the safety of equipment.

[0048] In a specific embodiment, the method for online identification of the operating status of an arc extinguishing device specifically comprises the following steps:

[0049] Step 1: Read the substation arc suppression device ledger, three-phase voltage, zero-sequence voltage, three-phase current, etc.

[0050] Step 2: Determine the arc extinguishing coil status based on the envelope fitting algorithm.

[0051] Remember the shortest data length for ,in is the sampling frequency. From the moment when the fault is judged as a single-phase grounding fault, the sampling frequency is sampling points, if there are not enough sampling points Then push forward from the last sampling point The sampling points are used as judgment data.

[0052] Zero sequence voltage The upper envelope of is exponentially fitted. The fitting formula is: , where is the decay time constant, is the amplitude coefficient, is the exponential function with natural logarithm as base, For time.

[0053] At the same time, the zero sequence voltage Perform FFT analysis to determine the frequency Is it 50HZ? , it will output “frequency does not match” and exit to prevent confusion with ferromagnetic resonance fault.

[0054] Simultaneous judgment and In the formula, Indicates the envelope amplitude within 0.2 seconds to 0.3 seconds, Indicates the maximum envelope amplitude within the selected time period. If yes, it proves that the envelope attenuation rate or attenuation time does not meet the requirements, that is, the arc extinguishing coil is not connected; if no, it proves that the envelope attenuation rate or attenuation time meets the requirements, that is, the arc extinguishing coil is connected.

[0055] For the busbar connected to the arc suppression coil, determine the zero-sequence voltage after the fault disappears. Is it less than the threshold? Is it established? If not, it is determined that "arc suppression coil compensation is abnormal and detuning degree exceeds the limit", and the system ends and exits; if established, it executes the next step.

[0056] Determine the neutral point displacement voltage With the system nominal voltage The ratio exceeds the preset threshold Is it established? If not, it is determined that "arc suppression coil compensation is abnormal, and the neutral point displacement voltage exceeds the limit", and it ends and exits; if it is established, execute the next step.

[0057] Determine the neutral point displacement voltage Less than the preset threshold Is it true? If so, it is determined that the "arc suppression coil grounding is abnormal", and the process ends and exits; otherwise, proceed to the next step.

[0058] Determine that the arc extinguishing coil is normal, end and exit.

[0059] Step 3: Diagnosis of effectiveness of active intervention arc extinguishing system.

[0060] The active intervention arc extinguishing system mainly includes a pre-circuit breaker, a current transformer, a voltage transformer, a control unit, a phase switch, and a grounding element. During operation, the busbar zero-sequence voltage is collected in real time as a starting criterion. When a single-phase grounding fault occurs in the distribution system, the zero-sequence voltage When the zero-sequence voltage is greater than the starting threshold of the active intervention arc extinguishing system When the phase selection function is activated, the device starts the phase selection function. Then the phase switch of the device is grounded and closed, and the device is grounded through the metallic grounding grid resistance, realizing the transfer of ground fault current and extinguishing the arc at the fault point.

[0061] The effectiveness diagnosis of the active intervention arc suppression system mainly relies on the comparison of the device action time with the technical standards and the substation action requirements. The key parameter identification method is as follows:

[0062] Input phase switch closure technical standard parameters And substation phase switch closing standard parameters ,in, is the number of technical standard tests, is the technical standard parameter vector, Respectively represent the first, second to third devices in the technical standard. Action time, is the standard parameter vector of the substation, Respectively represent the first, second, third, and fourth devices in the substation standard. Action time;

[0063] The first Actual action time Technical standard parameters for phase-splitting switch closure The Action time In contrast, if , then determine that the active intervention arc extinguishing system is normal and proceed to the next step; if , then the active intervention arc extinguishing system is determined to be abnormal and exit;

[0064] The first Actual action time Standard parameters for closing phase switches in substations The Action time In contrast, if , then calculate the rapid velocity , and proceed to the next step; if , it is determined that the active intervention arc extinguishing system has timed out, and the next step is carried out;

[0065] Repeat the iterative comparison until the exit condition is met or the technical standard detection times are reached .

[0066] In this embodiment, the following beneficial effects can be achieved:

[0067] 1. For the lines connected to the arc suppression coil, the compensation status of the arc suppression coil is diagnosed by combining the neutral point displacement voltage and the detuning degree, and the operation status of the arc suppression coil is refined, providing a basis for the subsequent operation and maintenance of the arc suppression coil;

[0068] 2. The arc suppression coil access status is diagnosed based on the envelope fitting algorithm and FFT algorithm. The zero-sequence voltage waveform change after the arc suppression coil is fully considered, which reduces the impact of historical data and known physical models on the operating status diagnosis results;

[0069] 3. It is proposed to diagnose the operating status of the active intervention type arc extinguishing device based on the technical standard parameters and substation technical parameters. The starting threshold of the active intervention type arc extinguishing device can be dynamically adjusted according to the needs of the substation, and the switching of the active intervention type arc extinguishing device can be controlled more accurately.

[0070] See also Figure 2 , which shows a structural block diagram of an online identification system for the operating status of an arc extinguishing device of the present application.

[0071] like Figure 2 As shown, the operating status online identification system 200 includes a selection module 210 , an analysis module 220 , a first judgment module 230 , a second judgment module 240 , a third judgment module 250 and an output module 260 .

[0072] The selection module 210 is configured to select the arc suppression coil from the end time of the single-phase grounding fault. sampling points, if the sampling points are insufficient Then push forward from the last sampling point until you get sampling points, that is, the data length is Zero-sequence voltage data; analysis module 220, configured to perform FFT analysis on the zero-sequence voltage data and determine the frequency after analysis Whether it is a preset frequency; the first judgment module 230 is configured to use a preset fitting strategy to perform exponential fitting on the upper envelope of the zero-sequence voltage data if it is a preset frequency, and to judge whether the envelope amplitude within the preset time period is greater than the first preset threshold, and whether the attenuation time constant is greater than the second preset threshold; the second judgment module 240 is configured to determine that there is an arc extinguishing coil connected if the envelope amplitude within the preset time period is not greater than the first preset threshold, or the attenuation time constant is not greater than the second preset threshold, and for the bus connected to the arc extinguishing coil, judge whether the zero-sequence voltage value after the fault disappears is less than the third preset threshold; the third judgment module 250 is configured to judge whether the neutral point displacement voltage meets the preset conditions if it is less than the third preset threshold; the output module 260 is configured to determine that the arc extinguishing coil is operating normally if it meets the preset conditions.

[0073] It should be understood that Figure 2 Modules and references documented in Figure 1 Therefore, the operations and features described above for the method and the corresponding technical effects are also applicable to Figure 2 The modules in it will not be described in detail here.

[0074] In other embodiments, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor executes the online identification method for the operating state of an arc extinguishing device in any of the above method embodiments;

[0075] As an implementation mode, the computer-readable storage medium of the present invention stores computer-executable instructions, and the computer-executable instructions are configured as follows:

[0076] For arc suppression coils, the time from the end of the single-phase grounding fault to the end of the fault is taken backwards. sampling points, if the sampling points are insufficient Then push forward from the last sampling point until you get sampling points, that is, the data length is Zero sequence voltage data;

[0077] Perform FFT analysis on the zero-sequence voltage data and determine the frequency after analysis Whether it is the preset frequency;

[0078] If it is a preset frequency, a preset fitting strategy is used to perform exponential fitting on the upper envelope of the zero-sequence voltage data, and it is determined whether the envelope amplitude within a preset time period is greater than a first preset threshold, and whether the decay time constant is greater than a second preset threshold;

[0079] If the envelope amplitude within the preset time period is not greater than the first preset threshold, or the attenuation time constant is not greater than the second preset threshold, it is determined that there is an arc extinguishing coil connected, and for the bus connected to the arc extinguishing coil, it is determined whether the zero-sequence voltage value after the fault disappears is less than the third preset threshold;

[0080] If it is less than the third preset threshold, determining whether the neutral point displacement voltage meets the preset condition;

[0081] If the preset conditions are met, it is determined that the arc extinguishing coil is operating normally.

[0082] The computer-readable storage medium may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the online identification system for the operating status of the arc extinguishing device, etc. In addition, the computer-readable storage medium may include a high-speed random access memory, and may also include a memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer-readable storage medium may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the online identification system for the operating status of the arc extinguishing device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0083] Figure 3 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention, such as Figure 3 As shown, the device includes: a processor 310 and a memory 320. The electronic device may also include: an input device 330 and an output device 340. The processor 310, the memory 320, the input device 330 and the output device 340 may be connected via a bus or other means. Figure 3 In the example, the connection through the bus is taken as an example. The memory 320 is the above-mentioned computer-readable storage medium. The processor 310 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 320, that is, the above-mentioned method embodiment is used for the online identification method of the operating status of the arc extinguishing device. The input device 330 can receive input digital or character information, and generate key signal input related to user settings and function control of the online identification system for the operating status of the arc extinguishing device. The output device 340 may include a display device such as a display screen.

[0084] The electronic device can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0085] As an implementation mode, the electronic device is applied to an online identification system for the operation status of an arc extinguishing device, and is used for a client, and includes: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can:

[0086] For arc suppression coils, the time from the end of the single-phase grounding fault to the end of the fault is taken backwards. sampling points, if the sampling points are insufficient Then push forward from the last sampling point until you get sampling points, that is, the data length is Zero sequence voltage data;

[0087] Perform FFT analysis on the zero-sequence voltage data and determine the frequency after analysis Whether it is the preset frequency;

[0088] If it is a preset frequency, a preset fitting strategy is used to perform exponential fitting on the upper envelope of the zero-sequence voltage data, and it is determined whether the envelope amplitude within a preset time period is greater than a first preset threshold, and whether the decay time constant is greater than a second preset threshold;

[0089] If the envelope amplitude within the preset time period is not greater than the first preset threshold, or the attenuation time constant is not greater than the second preset threshold, it is determined that there is an arc extinguishing coil connected, and for the bus connected to the arc extinguishing coil, it is determined whether the zero-sequence voltage value after the fault disappears is less than the third preset threshold;

[0090] If it is less than the third preset threshold, determining whether the neutral point displacement voltage meets the preset condition;

[0091] If the preset conditions are met, it is determined that the arc extinguishing coil is operating normally.

[0092] Through the description of the above implementation modes, those skilled in the art can clearly understand that each implementation mode can be implemented by means of software plus a necessary general hardware platform, or of course by hardware. Based on such an understanding, the above technical solution can essentially or in other words be embodied in the form of a software product that contributes to the prior art. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for online identification of the operating status of an arc extinguishing device, characterized in that: The arc extinguishing device includes an arc extinguishing coil and an active intervention type arc extinguishing system, and the method includes: For arc suppression coils, the time from the end of the single-phase grounding fault to the end of the fault is taken backwards. sampling points, if there are not enough sampling points Then push forward from the last sampling point until you get sampling points, that is, the data length is Zero sequence voltage data; Perform FFT analysis on the zero-sequence voltage data and determine the frequency after analysis Is it the preset frequency? After determining whether the frequency is the preset frequency, the method further includes: If it is not the preset frequency, the analysis of the operating status of the arc suppression coil will be stopped directly; If the frequency is preset, the upper envelope of the zero-sequence voltage data is exponentially fitted using a preset fitting strategy, and it is determined whether the envelope amplitude within the preset time period is greater than the first preset threshold, and whether the decay time constant is greater than the second preset threshold. The expression of the fitting strategy is: ， In the formula, is the decay time constant, is the amplitude coefficient, is the exponential function with natural logarithm as base, For time; After determining whether the envelope amplitude within the preset time period is greater than a first preset threshold and whether the decay time constant is greater than a second preset threshold, the method further includes: If the envelope amplitude within the preset time period is greater than the first preset threshold, and the decay time constant is greater than the second preset threshold, it is determined that the arc extinguishing coil is not connected; If the envelope amplitude within the preset time period is not greater than the first preset threshold, or the attenuation time constant is not greater than the second preset threshold, it is determined that there is an arc extinguishing coil connected, and for the bus connected to the arc extinguishing coil, it is determined whether the zero-sequence voltage value after the fault disappears is less than the third preset threshold, wherein after determining whether the zero-sequence voltage value after the fault disappears is less than the third preset threshold, the method further includes: If it is not less than the third preset threshold, it is determined that the arc extinguishing coil compensation is abnormal and the detuning degree exceeds the limit; If it is less than the third preset threshold, it is determined whether the neutral point displacement voltage meets the preset condition, wherein the determination of whether the neutral point displacement voltage meets the preset condition includes: Determining whether a ratio of a neutral point displacement voltage to a system nominal voltage is less than a fourth preset threshold; If it is not less than the fourth preset threshold, it is determined that the arc suppression coil compensation is abnormal and the neutral point displacement voltage exceeds the limit; If it is less than the fourth preset threshold, determining whether the neutral point displacement voltage is less than the fifth preset threshold; If it is not less than the fifth preset threshold, it is determined that the arc extinguishing coil is grounded abnormally; If it is less than the fifth preset threshold, it is determined that the arc extinguishing coil operates normally; If the preset conditions are met, it is determined that the arc extinguishing coil is operating normally.

2. The method for online identification of the operating status of an arc extinguishing device according to claim 1, characterized in that: The method further comprises: For arc suppression systems with active intervention, enter the technical standard parameters for phase switch closure And substation phase switch closing standard parameters ,in, is the number of technical standard tests, is the technical standard parameter vector, Respectively represent the first, second to third devices in the technical standard. Action time, is the standard parameter vector of the substation, Respectively represent the first, second, third, and fourth devices in the substation standard. Action time; The first Actual action time Technical standard parameters for phase-splitting switch closure The Action time In contrast, if , then determine that the active intervention arc extinguishing system is normal and proceed to the next step; if , then the active intervention arc extinguishing system is determined to be abnormal and exit; The first Actual action time Standard parameters for closing phase switches in substations The Action time In contrast, if , then calculate the rapid velocity , and proceed to the next step; if , it is determined that the active intervention arc extinguishing system has timed out, and the next step is carried out; Repeat the iterative comparison until the exit condition is met or the technical standard detection times are reached .

3. An online identification system for the operation status of an arc extinguishing device, characterized in that: The arc extinguishing device includes an arc extinguishing coil and an active intervention type arc extinguishing system, and the operating status online identification system includes: Select the module and configure it to take the time from the end of the single-phase grounding fault to the end of the single-phase grounding fault. sampling points, if there are not enough sampling points Then push forward from the last sampling point until you get sampling points, that is, the data length is Zero sequence voltage data; An analysis module is configured to perform FFT analysis on the zero-sequence voltage data and determine the frequency after analysis. Is it the preset frequency? Whether it is the preset frequency, it also includes: If it is not the preset frequency, the analysis of the operating status of the arc suppression coil will be stopped directly; The first judgment module is configured to use a preset fitting strategy to perform exponential fitting on the upper envelope of the zero-sequence voltage data if the frequency is preset, and judge whether the envelope amplitude within the preset time period is greater than the first preset threshold, and whether the decay time constant is greater than the second preset threshold, and the expression of the fitting strategy is: ， In the formula, is the decay time constant, is the amplitude coefficient, is the exponential function with natural logarithm as base, For time; After determining whether the envelope amplitude within the preset time period is greater than a first preset threshold value and whether the decay time constant is greater than a second preset threshold value, the method further includes: If the envelope amplitude within the preset time period is greater than the first preset threshold, and the decay time constant is greater than the second preset threshold, it is determined that the arc extinguishing coil is not connected; The second judgment module is configured to determine that there is an arc extinguishing coil connected if the envelope amplitude within the preset time period is not greater than the first preset threshold, or the attenuation time constant is not greater than the second preset threshold, and for the bus connected to the arc extinguishing coil, determine whether the zero-sequence voltage value after the fault disappears is less than the third preset threshold, wherein after determining whether the zero-sequence voltage value after the fault disappears is less than the third preset threshold, it also includes: If it is not less than the third preset threshold, it is determined that the arc extinguishing coil compensation is abnormal and the detuning degree exceeds the limit; The third judgment module is configured to judge whether the neutral point displacement voltage meets the preset condition if it is less than the third preset threshold, wherein the judging whether the neutral point displacement voltage meets the preset condition includes: Determining whether a ratio of a neutral point displacement voltage to a system nominal voltage is less than a fourth preset threshold; If it is not less than the fourth preset threshold, it is determined that the arc suppression coil compensation is abnormal and the neutral point displacement voltage exceeds the limit; If it is less than the fourth preset threshold, determining whether the neutral point displacement voltage is less than the fifth preset threshold; If it is not less than the fifth preset threshold, it is determined that the arc extinguishing coil is grounded abnormally; If it is less than the fifth preset threshold, it is determined that the arc extinguishing coil operates normally; The output module is configured to determine that the arc suppression coil is operating normally if the preset conditions are met.

4. An electronic device, characterized in that: include: At least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method described in any one of claims 1 to 2.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 2 is implemented.

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