Test method for opening and closing of high-voltage circuit breaker of transformer substation and storage medium

Abstract

This invention provides a testing method and storage medium for the opening and closing of high-voltage circuit breakers in substations, belonging to the technical field of high-voltage circuit breaker opening and closing testing. The testing method includes acquiring the operating signal and operating time of the high-voltage circuit breaker; acquiring the induced current of the Rogowski coil on one side of the grounding wire of the high-voltage circuit breaker and the acquisition time. By acquiring parameters such as the operating signal, operating time, induced current, and acquisition time of the high-voltage circuit breaker, the testing method provided by this invention can accurately statistically analyze the specific operating data of the high-voltage circuit breaker during the opening and closing process. This statistical data is then analyzed to obtain accurate time characteristics of the high-voltage circuit breaker during the opening and closing process. Based on these time characteristics, maintenance and repair of the high-voltage circuit breaker can be performed more accurately and reliably, further improving the safety of power grid operation.

Description

Technical Field

[0001] This invention relates to the field of testing technology for the opening and closing of high-voltage circuit breakers in substations, and specifically to a testing method and storage medium for the opening and closing of high-voltage circuit breakers in substations. Background Technology

[0002] High-voltage circuit breakers (or high-voltage switches) can not only interrupt or close no-load and load currents in high-voltage circuits, but also, when a system fault occurs, interrupt overload and short-circuit currents through relay protection devices. They have a highly sophisticated arc-extinguishing structure and sufficient breaking capacity. Therefore, the opening and closing time characteristics of high-voltage circuit breakers are very important for the safety of power grid lines.

[0003] Currently, the common test method for measuring the opening and closing times of high-voltage circuit breakers is to disconnect the grounding wires on one side of both ends of the circuit breaker and then suspend test leads across both ends. This method requires direct measurement using test leads and testing equipment, and does not consider interference during the testing process, thus introducing a certain degree of measurement error.

[0004] In the process of realizing this invention, the inventors of this application discovered that the above-mentioned solutions in the prior art have certain operational safety hazards. Summary of the Invention

[0005] The purpose of this invention is to provide a test method and storage medium for the opening and closing of high-voltage circuit breakers in substations. This test method and storage medium for the opening and closing of high-voltage circuit breakers in substations have the function of eliminating potential operational safety hazards.

[0006] To achieve the above objectives, embodiments of the present invention provide a testing method for the opening and closing of a high-voltage circuit breaker in a substation, comprising:

[0007] Obtain the operating signal and operating time of the high-voltage circuit breaker;

[0008] Obtain the induced current of the Rogowski coil on the grounding wire on one side of the high-voltage circuit breaker and the acquisition time;

[0009] The opening and closing characteristics of the high-voltage circuit breaker are obtained based on the action signal, the action time, the induced current, and the acquisition time.

[0010] Optionally, obtaining the induced current of the Rogowski coil on the grounding wire on one side of the high-voltage circuit breaker and the acquisition time includes:

[0011] Determine whether the Rogowski coil has a rectangular core structure;

[0012] Assuming the Rogowski coil has a rectangular core structure, the first mutual inductance coefficient of the Rogowski coil is calculated according to formula (1).

[0013]

[0014] Where M1 is the first mutual inductance coefficient of the Rogowski coil, μ0 is the permeability of free space, N is the number of turns per unit length of the Rogowski coil, h is the width of the Rogowski coil, b is the outer diameter of the Rogowski coil, and a is the inner diameter of the Rogowski coil.

[0015] The first mutual inductance coefficient is used as the self-mutual inductance coefficient of the Rogowski coil;

[0016] The induced electromotive force of the Rogowski coil is calculated based on its mutual inductance coefficient.

[0017] Optionally, obtaining the induced current of the Rogowski coil on the grounding wire on one side of the high-voltage circuit breaker and the acquisition time further includes:

[0018] If it is determined that the Rogowski coil is not a rectangular core structure, then the Rogowski coil is determined to be a circular core structure.

[0019] The second mutual inductance coefficient of the Rogowski coil is calculated according to formula (2).

[0020]

[0021] Where M2 is the second mutual inductance coefficient of the Rogowski coil, S is the cross-sectional area of ​​the Rogowski coil, D is the center diameter of the Rogowski coil, and d is the diameter of the circular cross-section;

[0022] The second mutual inductance coefficient is used as the self-mutual inductance coefficient of the Rogowski coil;

[0023] The induced electromotive force of the Rogowski coil is calculated based on its mutual inductance coefficient.

[0024] Optionally, calculating the induced electromotive force of the Rogowski coil based on the mutual inductance coefficient includes:

[0025] The induced electromotive force of the Rogowski coil is calculated according to formula (3).

[0026]

[0027] Where e(t) is the induced electromotive force of the Rogowski coil, M is the self-mutual inductance coefficient, and I1(t) is the current flowing through the grounding wire on one side of the high-voltage circuit breaker at time t.

[0028] The induced current of the Rogowski coil is obtained based on the induced electromotive force of the Rogowski coil.

[0029] Optionally, obtaining the opening and closing characteristics of the high-voltage circuit breaker based on the action signal, the action time, the induced current, and the acquisition time includes:

[0030] The historical action signals, action times, induced currents, and acquisition times are collected to form a time characteristic data set;

[0031] The time characteristic data set is processed using Fast Fourier Transform;

[0032] The opening and closing characteristics of the high-voltage circuit breaker are judged based on the calculation results.

[0033] Optionally, processing the time characteristic data set using Fast Fourier Transform includes:

[0034] According to formula (4), the opening and closing time characteristics of the high-voltage circuit breaker are subjected to a fast Fourier transform.

[0035]

[0036] in, G represents the frequency domain characteristic of the opening and closing time characteristics of the high-voltage circuit breaker after Fast Fourier Transform. F (k) represents the frequency domain characteristics of even-numbered samples in the time characteristic set after Fourier transform, H F (k) represents the frequency domain characteristics of the odd-numbered samples in the time characteristic set after Fourier transform, and N is the total number of samples in the time characteristic set. This is the transformation matrix of the Fast Fourier Transform.

[0037] Optionally, performing a fast Fourier transform on the opening and closing time characteristics of the high-voltage circuit breaker according to formula (4) includes:

[0038] The frequency domain characteristics of the Fourier transform of the time characteristic data set are obtained according to formula (5).

[0039]

[0040] Among them, X F (k) represents the frequency domain characteristic of the N points of the time characteristic data set after Fourier transform, n represents the sample in the time characteristic data set and n is an integer number, x(n) represents the time characteristic data set, r is an integer number and r∈N.

[0041] Optionally, performing a fast Fourier transform on the opening and closing time characteristics of the high-voltage circuit breaker according to formula (4) further includes:

[0042] Calculate the transformation matrix of the Fourier transform according to formula (6).

[0043]

[0044] in, The transformation matrix is;

[0045] Substituting equation (6) into equation (5), the frequency domain characteristics of the Fourier transform of the time characteristic data set are shown in equation (7).

[0046]

[0047] Transforming formula (7) yields formula (8).

[0048]

[0049] Calculate the transformation matrix of the Fast Fourier Transform according to formula (9).

[0050]

[0051] in, This is the transformation matrix for the Fast Fourier Transform;

[0052] Substituting formula (9) into formula (8) yields formula (4).

[0053] On the other hand, the present invention provides a computer-readable storage medium storing instructions that are read by a machine to cause the machine to perform any of the test methods described above.

[0054] Through the above technical solution, the substation high-voltage circuit breaker opening and closing test method provided by the present invention can accurately statistically analyze the specific action data of the high-voltage circuit breaker during the opening and closing process by acquiring parameters such as the action signal, action time, induced current, and acquisition time of the high-voltage circuit breaker. The statistical data can be analyzed and processed to obtain the accurate time characteristics of the high-voltage circuit breaker during the opening and closing process. Based on these time characteristics, the high-voltage circuit breaker can be inspected and maintained more accurately and reliably, further improving the safety of power grid operation.

[0055] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0056] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0057] Figure 1 This is a flowchart of a test method for opening and closing a substation high-voltage circuit breaker according to an embodiment of the present invention.

[0058] Figure 2 This is a flowchart of obtaining the induced current of the Rogowski coil in a test method for opening and closing a substation high-voltage circuit breaker according to an embodiment of the present invention.

[0059] Figure 3 This is a flowchart illustrating the determination of the opening and closing characteristics of a high-voltage circuit breaker in a test method for the opening and closing of a substation high-voltage circuit breaker according to an embodiment of the present invention. Detailed Implementation

[0060] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0061] Figure 1 This is a flowchart of a test method for the opening and closing of a substation high-voltage circuit breaker according to an embodiment of the present invention. Figure 1 In this context, the testing method may include:

[0062] In step S10, the operating signal and operating time of the high-voltage circuit breaker are acquired. The operating signal and operating time of the high-voltage circuit breaker are recorded by sensors connected to the operating contacts of the high-voltage circuit breaker.

[0063] In step S11, the induced current of the Rogowski coil on one side of the high-voltage circuit breaker and the acquisition time are obtained. For testing the time characteristics of the high-voltage circuit breaker, a coupling device can be installed on the grounding wire on the other side of the high-voltage circuit breaker to couple an induced current onto that grounding wire. A Rogowski coil is then installed on the grounding wire on one side of the high-voltage circuit breaker. Before the high-voltage circuit breaker closes, no induced current is generated in the Rogowski coil. When the high-voltage circuit breaker closes, the coupled current on the grounding wire on the other side of the high-voltage circuit breaker flows to one side of the high-voltage circuit breaker's grounding wire and generates an induced current in the Rogowski coil. Conversely, there is current in the Rogowski coil before opening and no current in the Rogowski coil after opening. Therefore, the presence or absence of current in the Rogowski coil can be used to determine whether the high-voltage circuit breaker has undergone opening or closing operations. The induced current in the Rogowski coil is acquired, and the acquisition time of the induced current is also recorded synchronously.

[0064] In step S12, the opening and closing characteristics of the high-voltage circuit breaker are obtained based on the action signal, action time, induced current, and acquisition time. Specifically, given the known action signal (i.e., the opening and closing signal of the high-voltage circuit breaker), action time (the opening and closing time of the high-voltage circuit breaker), induced current (the completion signal of the opening and closing of the high-voltage circuit breaker), and acquisition time (the completion time of the opening and closing of the high-voltage circuit breaker), this data is processed to obtain the precise opening and closing time characteristics of the high-voltage circuit breaker, thereby enabling reliable maintenance of the high-voltage circuit breaker.

[0065] In steps S10 to S12, by acquiring the action signal and action time of the high-voltage circuit breaker before opening and closing, as well as the induced current and acquisition time after opening and closing, the data before and after the high-voltage circuit breaker can be accurately statistically analyzed. Based on this data, the time characteristics of the high-voltage circuit breaker can be calculated. This time characteristic removes the influence of external interference and is more reliable.

[0066] Traditional testing of the opening and closing times of high-voltage circuit breakers typically involves disconnecting the grounding wires from one end of the circuit breaker and then suspending test leads across both ends. However, this method requires direct measurement using test leads and testing equipment, neglecting interference during the testing process and introducing measurement errors. In this embodiment of the invention, statistical calculations are performed on multiple data points before and after the high-voltage circuit breaker operation. This allows for the acquisition of precise time characteristics of the high-voltage circuit breaker, providing greater accuracy and reliability, and further improving the safety of power grid operation.

[0067] In this embodiment of the invention, in order to further clarify the induced current value of the Rogowski coil on the grounding wire on one side of the high-voltage circuit breaker, it is also necessary to calculate the self-mutual inductance coefficient of the Rogowski coil. The specific steps can be as follows: Figure 2 As shown. Specifically, in Figure 2 In this process, this step may include:

[0068] In step S20, it is determined whether the Rogowski coil has a rectangular core structure. The signal acquisition device for the induced current on one side of the high-voltage circuit breaker uses a Rogowski coil. The coil portion of the Rogowski coil is wrapped around the grounding wire on one side of the high-voltage circuit breaker. The integrator of the Rogowski coil is connected to the acquisition card, and the result is output. The Rogowski coil is uniformly and tightly wound on a ring-shaped frame made of a non-magnetic material (such as polyamide). A terminating resistor Rs is connected to both ends of the coil for current measurement. The output of the current coil is an induced voltage, which is the differential of the current flowing through the measured conductor with respect to time.

[0069] In step S21, if the Rogowski coil is determined to be a rectangular core structure, the first mutual inductance coefficient of the Rogowski coil is calculated according to formula (1).

[0070]

[0071] Where M1 is the first mutual inductance of the Rogowski coil, μ0 is the permeability of free space, N is the number of turns per unit length of the Rogowski coil, h is the width of the Rogowski coil, b is the outer diameter of the Rogowski coil, and a is the inner diameter of the Rogowski coil. Specifically, the mutual inductance M1 is related to the number of turns and the specific dimensions of the coil. Increasing the number of turns and the coil dimensions can effectively increase M1. However, an excessively large number of turns will increase the internal resistance of the coil, so the number of turns should be selected appropriately.

[0072] In step S22, the first mutual inductance coefficient is used as the self-mutual inductance coefficient of the Rogowski coil.

[0073] In step S23, if it is determined that the Rogowski coil is not a rectangular core structure, then the Rogowski coil is determined to be a circular core structure. Specifically, if the Rogowski coil is not a rectangular core structure, then it is considered to be a circular core structure.

[0074] In step S24, the second mutual inductance coefficient of the Rogowski coil is calculated according to formula (2).

[0075]

[0076] Where M2 is the second mutual inductance coefficient of the Rogowski coil, S is the cross-sectional area of ​​the Rogowski coil, D is the center diameter of the Rogowski coil, and d is the diameter of the circular cross-section. Specifically, the mutual inductance coefficient M2 is related to the number of turns and the specific dimensions of the coil. Increasing the number of turns and the coil dimensions can effectively increase M2. However, an excessive number of turns will increase the internal resistance of the coil, so the number of turns should be selected appropriately.

[0077] In step S25, the second mutual inductance coefficient is used as the self-mutual inductance coefficient of the Rogowski coil.

[0078] In step S26, the induced electromotive force of the Rogowski coil is calculated according to formula (3).

[0079]

[0080] Where e(t) is the induced electromotive force of the Rogowski coil, M is the mutual inductance coefficient, and I1(t) is the current flowing through the grounding wire on one side of the high-voltage circuit breaker at time t. Specifically, assume that the measured current flowing through the current-carrying conductor is I1(t) / A. If the current-carrying conductor is one turn, according to Ampere's circuital law as shown in formula (10),

[0081]

[0082] Where H is the magnetic field strength, and the magnetic induction intensity B = μ0H, μ0 = 4πx10 -7H / m, where l is the length of the current-carrying conductor. Therefore, the magnetic field strength and magnetic induction intensity can be expressed as shown in formula (11).

[0083]

[0084] Where, r c Where D is the center radius of the coil, D = 2r c The induced electromotive force obtained by the coil is calculated according to formula (12).

[0085]

[0086] Where ψ is the total magnetic flux linkage, and n is the total number of turns of the Rogowski coil, and the magnetic flux of the hinge of each turn. and Therefore, the induced electromotive force obtained by the coil can be obtained as shown in formula (13).

[0087]

[0088] Let the coefficients on the right side of the above equation be the coefficients of the Rogowski coil and the current-carrying conductor, then we can obtain the result shown in formula (14).

[0089]

[0090] Where N is the number of turns per unit length of the Rogowski coil, i.e., the small coil turn density, and the expression for the mutual inductance coefficient M in the above formula is a theoretical value obtained without considering the influence of the Rogowski coil structural parameters. If the distributed capacitance of the coil is not considered, the self-inductance coefficient of the Rogowski coil is approximately as shown in formula (15).

[0091]

[0092] The expressions for the mutual inductance and self-inductance of the Rogowski coil obtained above are theoretical calculation values ​​without considering the influence of the parameters of the Rogowski coil structure. The induced electromotive force can be shown as in formula (3).

[0093] In step S27, the induced current of the Rogowski coil is obtained based on the induced electromotive force of the Rogowski coil.

[0094] In steps S20 to S27, the specific structure of the Rogowski coil needs to be determined. Different coil structures correspond to different mutual inductance coefficients. After calculating the mutual inductance coefficient of the Rogowski coil, the induced electromotive force (EMF) on the Rogowski coil is calculated based on this coefficient. Finally, the induced current is calculated based on this EMF to facilitate subsequent calculations of the time characteristics of the high-voltage circuit breaker. Specifically, corresponding to the number of turns of the Rogowski coil, the coil must be "backwound" once during processing, that is, the coil is wound along any closed curved surface. After reaching the end point, it is sparsely backwound to the starting point. The use of a back-wound during winding is to eliminate interference from external magnetic fields, and uniform dense winding is to reduce the influence of inter-turn capacitance on the measurement.

[0095] In this embodiment of the invention, in order to obtain the opening and closing characteristics of the high-voltage circuit breaker, it is necessary to analyze and process multiple parameters. The specific steps are as follows: Figure 3 As shown. Specifically, in Figure 3 In this process, this step may include:

[0096] In step S30, historical action signals, action times, induced currents, and acquisition times are collected to form a time characteristic data set.

[0097] In step S31, the fast Fourier transform is used to process the time characteristic data set. Fourier transform is a crucial algorithm in the field of digital signal processing. The Fourier principle states that all continuously measurable time or frequency can represent an infinite superposition of sinusoidal frequencies of different frequencies. The Fourier transform algorithm based on this principle uses all detectable raw information to statistically analyze the frequency, amplitude, and phase of various sinusoidal signals at that frequency using an accumulation method. The fast Fourier transform (FFT) is an efficient implementation of the discrete Fourier transform. Commonly used fast Fourier transforms include time-domain decimation and frequency-domain decimation methods; the calculation used in this invention belongs to the time-domain decimation method of FFT. The fast algorithm can reduce the computational complexity of the discrete Fourier transform (DFT) of N discrete signal points to Nlog2N complex operations, and also reduces storage requirements and computational errors caused by finite bit operations. Specifically, the frequency domain characteristics of the Fourier transform of the time characteristic data set are obtained according to formula (5).

[0098]

[0099] Among them, X F (k) represents the frequency domain characteristics of N points of the time characteristic data set after Fourier transform, n represents the sample in the time characteristic data set and n is an integer number, x(n) represents the time characteristic data set, r is an integer number and r∈N.

[0100] Calculate the transformation matrix of the Fourier transform according to formula (6).

[0101]

[0102] in, This is the transformation matrix;

[0103] Substituting equation (6) into equation (5), we obtain the frequency domain characteristics of the Fourier transform of the time characteristic data set as shown in equation (7).

[0104]

[0105] Among them, X F (k) has a period of N, X F (k)=X F (k+N).

[0106] Transforming formula (7) yields formula (8).

[0107]

[0108] Among them, G F (k) and H F (k) has a period of N / 2, G F (k)=G F (k+N / 2), H F (k)=H F (k+N / 2).

[0109] Calculate the transformation matrix of the Fast Fourier Transform according to formula (9).

[0110]

[0111] in, This is the transformation matrix for the Fast Fourier Transform;

[0112] Substituting formula (9) into formula (8) yields the opening and closing time characteristics of the high-voltage circuit breaker, which are then subjected to a fast Fourier transform as shown in formula (4).

[0113]

[0114] in, G represents the frequency domain characteristic of the opening and closing time characteristics of a high-voltage circuit breaker after Fast Fourier Transform. F (k) represents the frequency domain characteristics of even-numbered samples in the time characteristic set after Fourier transform, H F (k) represents the frequency domain characteristics of the odd-numbered samples in the time characteristic set after Fourier transform, and N is the total number of samples in the time characteristic set. This is the transformation matrix of the Fast Fourier Transform.

[0115] G F (k) and H F (k) all need to be performed (N / 2). 2 Complex multiplication sum of N / 2 2 Complex number addition. And directly calculating the DFTX of an N-point sequence. F (k) then N is needed 2 Complex number addition and complex number multiplication. Taking N=16 as an example, directly calculating a 16-point DFT requires N... 2 = 256 multiplications and additions. And by calculating G... F (k) and H F (k) Only 128 + 16 = 144 multiplications and additions are required, thus saving 112 additions and multiplications. This shows that the Fast Fourier Transform greatly improves the efficiency of Fourier operations.

[0116] In step S32, the opening and closing characteristics of the high-voltage circuit breaker are judged based on the calculation results. Specifically, after obtaining the opening and closing time characteristics of the high-voltage circuit breaker, these characteristics need to be compared with standard parameters to determine whether the time characteristics are within the standard range, thus indicating whether the opening and closing of the high-voltage circuit breaker is normal.

[0117] In steps S30 to S32, the time characteristic set is processed by fast Fourier transform to convert the time domain into the frequency domain, thereby obtaining the time characteristics of the high-voltage circuit breaker during opening and closing, which can more accurately reflect the opening and closing state of the high-voltage circuit breaker.

[0118] On the other hand, the present invention also provides a computer-readable storage medium storing instructions for being read by a machine to cause the machine to perform any of the test methods described above.

[0119] Through the above technical solution, the substation high-voltage circuit breaker opening and closing test method provided by the present invention can accurately statistically analyze the specific action data of the high-voltage circuit breaker during the opening and closing process by acquiring parameters such as the action signal, action time, induced current, and acquisition time of the high-voltage circuit breaker. The statistical data can be analyzed and processed to obtain the accurate time characteristics of the high-voltage circuit breaker during the opening and closing process. Based on these time characteristics, the high-voltage circuit breaker can be inspected and maintained more accurately and reliably, further improving the safety of power grid operation.

[0120] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0121] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0122] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0123] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0124] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0125] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0126] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0127] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0128] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A test method for the opening and closing of a high-voltage circuit breaker in a substation, characterized in that, include: Obtain the operating signal and operating time of the high-voltage circuit breaker; Obtain the induced current of the Rogowski coil on the grounding wire on one side of the high-voltage circuit breaker and the acquisition time; The opening and closing characteristics of the high-voltage circuit breaker are obtained based on the action signal, the action time, the induced current, and the acquisition time. The opening and closing characteristics of the high-voltage circuit breaker are obtained based on the action signal, the action time, the induced current, and the acquisition time, including: The historical action signals, action times, induced currents, and acquisition times are collected to form a time characteristic data set; The time characteristic data set is processed using Fast Fourier Transform; The opening and closing characteristics of the high-voltage circuit breaker are judged based on the calculation results.

2. The test method according to claim 1, characterized in that, The acquisition of the induced current of the Rogowski coil on the grounding wire on one side of the high-voltage circuit breaker and the acquisition time include: Determine whether the Rogowski coil has a rectangular core structure; Assuming the Rogowski coil has a rectangular core structure, the first mutual inductance coefficient of the Rogowski coil is calculated according to formula (1). ，（1） in, The first mutual inductance coefficient of the Rogowski coil is... The permeability of free space, The number of turns per unit length of the Rogowski coil. The width of the Rogowski coil. The outer diameter of the Rogowski coil is given. The inner diameter of the Rogowski coil; The first mutual inductance coefficient is used as the self-mutual inductance coefficient of the Rogowski coil; The induced electromotive force of the Rogowski coil is calculated based on its mutual inductance coefficient.

3. The test method according to claim 2, characterized in that, Obtaining the induced current of the Rogowski coil on the grounding wire on one side of the high-voltage circuit breaker and the acquisition time also includes: If it is determined that the Rogowski coil is not a rectangular core structure, then the Rogowski coil is determined to be a circular core structure. The second mutual inductance coefficient of the Rogowski coil is calculated according to formula (2). ，（2） in, The second mutual inductance coefficient of the Rogowski coil is... The cross-sectional area of ​​the Rogowski coil is... The center diameter of the Rogowski coil is... The diameter of the circular cross-section; The second mutual inductance coefficient is used as the self-mutual inductance coefficient of the Rogowski coil; The induced electromotive force of the Rogowski coil is calculated based on its mutual inductance coefficient.

4. The test method according to claim 2 or 3, characterized in that, Calculating the induced electromotive force of the Rogowski coil based on the mutual inductance coefficient includes: The induced electromotive force of the Rogowski coil is calculated according to formula (3). ，（3） in, The induced electromotive force of the Rogowski coil is... The mutual inductance coefficient is the coefficient of the self. For the first The current flowing through the grounding wire on one side of the high-voltage circuit breaker at any given time; The induced current of the Rogowski coil is obtained based on the induced electromotive force of the Rogowski coil.

5. The test method according to claim 1, characterized in that, The calculation and processing of the time characteristic data set using Fast Fourier Transform includes: According to formula (4), the opening and closing time characteristics of the high-voltage circuit breaker are subjected to fast Fourier transform. ，（4） in, The frequency domain characteristic of the opening and closing time characteristics of the high-voltage circuit breaker after Fast Fourier Transform is given. The frequency domain characteristics of even-numbered samples in the time characteristic set after Fourier transform. The frequency domain characteristics of the odd-numbered samples in the time characteristic set after Fourier transform. The total number of samples in the time characteristic set. This is the transformation matrix of the Fast Fourier Transform.

6. The test method according to claim 5, characterized in that, According to formula (4), the fast Fourier transform of the opening and closing time characteristics of the high-voltage circuit breaker includes: According to formula (5), the frequency domain characteristics of the Fourier transform of the time characteristic data set are obtained. ， ， ， ，（5） in, For the time characteristic data set Frequency domain characteristics of a point after Fourier transform. The samples are from the time characteristic data set, and Numbered by integer. For the time characteristic data set, The number is an integer, and .

7. The test method according to claim 6, characterized in that, According to formula (4), the fast Fourier transform of the opening and closing time characteristics of the high-voltage circuit breaker also includes: Calculate the transformation matrix of the Fourier transform according to formula (6). ，（6） in, The transformation matrix is; Substituting equation (6) into equation (5), the frequency domain characteristics of the Fourier transform of the time characteristic data set are shown in equation (7). ， ，（7） Transforming formula (7) yields formula (8). ，（8） Calculate the transformation matrix of the Fast Fourier Transform according to formula (9). ，（9） in, This is the transformation matrix for the Fast Fourier Transform; Substituting formula (9) into formula (8) yields formula (4).

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that are read by a machine to cause the machine to perform the test method as described in any one of claims 1 to 7.

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