A method for checking breaking capacity of a high-voltage circuit breaker and related device

Abstract

The present application relates to the technical field of high-voltage electrical equipment calibration, and particularly relates to a high-voltage circuit breaker breaking capacity calibration method and related device, wherein the method comprises: obtaining a short-circuit current signal through a pre-trained short-circuit current recognition model; and obtaining a short-circuit current characteristic parameter through wavelet transform on the short-circuit current signal; and determining the breaking capacity of a high-voltage circuit breaker to be calibrated according to the short-circuit current characteristic and the characteristic parameter of the high-voltage circuit breaker to be calibrated, thereby realizing rapid calibration of the breaking capacity of the high-voltage circuit breaker under the influence of a direct current component and improving the safe operation level of the power system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage electrical equipment calibration, and in particular to a high-voltage circuit breaker breaking capacity calibration method and related device. BACKGROUND

[0002] A high-voltage circuit breaker is used to cut off or close the no-load current and load current in a high-voltage circuit, and when a short circuit occurs, it also cuts off the overload current and short-circuit current through the action of a relay protection device, thereby protecting the circuit. Therefore, the high-voltage circuit breaker plays an important role in ensuring the safe operation of the power system.

[0003] In order to improve the safe operation level of the power system, the breaking capacity of the high-voltage circuit breaker needs to be calibrated before use. The prior art determines the breaking capacity of the high-voltage circuit breaker under alternating current components by judging whether the breaking current of the high-voltage circuit breaker meets the requirements of the short-circuit current alternating component. However, with the increase in voltage level of the power grid and the continuous application of large-capacity generators and transformers, the ratio of reactance to resistance of the primary equipment increases, and the time constant of the short-circuit current direct component gradually increases, resulting in an excessive direct component that affects the short-circuit breaking capacity of the high-voltage circuit breaker. Therefore, how to calibrate the short-circuit breaking capacity of the high-voltage circuit breaker under the direct component has become a technical problem to be solved. SUMMARY

[0004] The present application provides a high-voltage circuit breaker breaking capacity calibration method and related device for calibrating the breaking capacity of a high-voltage circuit breaker under a direct component.

[0005] In one aspect, the present application provides a high-voltage circuit breaker breaking capacity calibration method, which comprises:

[0006] wavelet transforming the short-circuit current signal to obtain a short-circuit current characteristic parameter;

[0007] obtaining a characteristic parameter of a high-voltage circuit breaker to be calibrated;

[0008] determining the breaking capacity of the high-voltage circuit breaker to be calibrated according to the short-circuit current characteristic parameter and the characteristic parameter.

[0009] Optionally, the characteristic parameter is a rated parameter, and the rated parameter includes a rated breaking current, a rated short-circuit current direct component time constant, a rated breaking last half-wave zero-crossing time, and a rated breaking duration.

[0010] Optionally, the characteristic parameter is a type test parameter.

[0011] The type test parameters include: a test breaking short-circuit current direct current component time constant, a test breaking short-circuit current, a test breaking last half-wave zero-crossing time and a test breaking duration.

[0012] Optionally, the short-circuit current characteristic parameters include: an actual breaking short-circuit current, an actual breaking last half-wave zero-crossing time, an actual breaking duration and an actual short-circuit current direct current component time constant.

[0013] The determining of the breaking capacity of the high-voltage circuit breaker to be checked according to the short-circuit current characteristic and the characteristic parameters includes:

[0014] A ratio of the actual breaking short-circuit current to the rated breaking short-circuit current is calculated to obtain a first current ratio.

[0015] A first time ratio is calculated according to the rated short-circuit current direct current component time constant, the rated breaking last half-wave zero-crossing time, the rated breaking duration, the actual breaking last half-wave zero-crossing time, the actual breaking duration and the actual short-circuit current direct current component time constant.

[0016] If yes, it is determined that the checking result of the breaking capacity of the high-voltage circuit breaker to be checked is qualified.

[0017] Optionally, the short-circuit current characteristic parameters include: an actual breaking short-circuit current, an actual breaking last half-wave zero-crossing time, an actual breaking duration and an actual short-circuit current direct current component time constant.

[0018] The determining of the breaking capacity of the high-voltage circuit breaker to be checked according to the short-circuit current characteristic and the characteristic parameters includes:

[0019] A ratio of the actual breaking short-circuit current to the test breaking short-circuit current is calculated to obtain a second current ratio.

[0020] A second time ratio is calculated according to the test breaking short-circuit current direct current component time constant, the test breaking short-circuit current, the test breaking last half-wave zero-crossing time, the test breaking duration, the actual breaking last half-wave zero-crossing time, the actual breaking duration and the actual short-circuit current direct current component time constant.

[0021] If yes, it is determined that the checking result of the breaking capacity of the high-voltage circuit breaker to be checked is qualified.

[0022] Optionally, the calculation formula of the first time ratio is:

[0023]

[0024] wherein τ SA is the actual short-circuit current DC component time constant, are the first and second time instants of the actual breaking of the last half-wave zero crossing, respectively, and ΔT S is the actual breaking duration, I NA is the rated breaking current, τ NA is the rated short-circuit current DC component time constant, T1, T2 are the first and second time instants of the rated breaking of the last half-wave zero crossing, respectively, and ΔT is the rated breaking duration.

[0025] Optionally, the formula for calculating the second time ratio is:

[0026]

[0027] wherein τ SA is the actual short-circuit current DC component time constant, are the first and second time instants of the actual breaking of the last half-wave zero crossing, respectively, and ΔT S is the actual breaking duration, τ’ A is the short-circuit current DC component time constant of the test breaking, T’1, T’2 are the first and second time instants of the test breaking of the last half-wave zero crossing, respectively, and ΔT’ is the test breaking duration.

[0028] Another aspect of the present application provides a high-voltage circuit breaker breaking capacity checking device, the device comprising:

[0029] a first obtaining module for obtaining a short-circuit current signal by using a pre-trained short-circuit current recognition model;

[0030] a transforming module for performing wavelet transform on the short-circuit current signal to obtain a short-circuit current characteristic parameter;

[0031] a second obtaining module for obtaining a characteristic parameter of a high-voltage circuit breaker to be checked;

[0032] a determining module for determining the breaking capacity of the high-voltage circuit breaker to be checked according to the short-circuit current characteristic parameter and the characteristic parameter.

[0033] Another aspect of the present application provides an electronic device, the device comprising a processor and a memory:

[0034] the memory is configured to store program code and transmit the program code to the processor;

[0035] the processor is configured to execute the method as described above according to the instructions in the program code.

[0036] Another aspect of the present application provides a computer readable storage medium for storing program code for performing the method as described above.

[0037] From the above technical solutions, the present application has the following advantages:

[0038] The high-voltage circuit breaker breaking capacity checking method provided by the present application obtains a short-circuit current signal through a pre-trained short-circuit current recognition model, obtains a short-circuit current characteristic parameter through wavelet transform on the short-circuit current signal, obtains a characteristic parameter of a high-voltage circuit breaker to be checked, and determines the breaking capacity of the high-voltage circuit breaker to be checked according to the short-circuit current characteristic and the characteristic parameter, thereby realizing rapid checking of the breaking capacity of the high-voltage circuit breaker under the influence of a direct current component and improving the safe operation level of a power system. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Figure 1 A flowchart of a high-voltage circuit breaker breaking capacity checking method provided by the first aspect of the present application is shown in the figure.

[0041] Figure 2 A flowchart of a high-voltage circuit breaker breaking capacity checking method provided by the second aspect of the present application is shown in the figure.

[0042] Figure 3 A basic structure diagram of a neuron of a short-circuit current recognition model in the embodiment of the present application is shown in the figure.

[0043] Figure 4 A network structure model diagram of a short-circuit current recognition model in the embodiment of the present application is shown in the figure.

[0044] Figure 5 A flowchart of a high-voltage circuit breaker breaking capacity checking method provided by the third aspect of the present application is shown in the figure.

[0045] Figure 6 A structure diagram of a high-voltage circuit breaker breaking capacity checking device provided by the fourth aspect of the present application is shown in the figure. DETAILED DESCRIPTION

[0046] The embodiment of the present application provides a high-voltage circuit breaker breaking capacity checking method and related device, which are used for checking the breaking capacity of the high-voltage circuit breaker under the direct current component.

[0047] In order to make the application purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the following described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0048] Please refer to Figure 1 , Figure 1 The schematic diagram of the high-voltage circuit breaker breaking capacity checking method provided by the first aspect of the present application is shown in the figure.

[0049] The high-voltage circuit breaker breaking capacity checking method provided by the present embodiment comprises:

[0050] 101, obtaining the short-circuit current signal through the pre-trained short-circuit current identification model;

[0051] It should be noted that the short-circuit current identification model is used for real-time monitoring and identifying the system voltage and current state in the power system, and outputting the short-circuit current signal when the short circuit occurs.

[0052] The short-circuit current identification model of the present embodiment adopts a neural network model with extremely strong non-linear mapping capability. The power system current and voltage data are taken as the model input, and the short-circuit current signal is taken as the output. The neural network model is trained, so as to obtain the short-circuit current identification model for identifying the short-circuit current signal.

[0053] In another preferred embodiment, the output short-circuit current signal contains the zero-crossing point position.

[0054] Therefore, the present embodiment identifies and extracts the short-circuit current signal through the pre-trained short-circuit current identification model, avoids the error problem and large amount of calculation problem caused by the parameter extraction and waveform restoration process in the existing method of restoring the short-circuit current waveform for short-circuit current identification by extracting the short-circuit current key parameters, improves the short-circuit current signal precision, and provides effective data support for high-voltage circuit breaker checking.

[0055] 102, performing wavelet transform on the short-circuit current signal to obtain the short-circuit current characteristic parameters.

[0056] It should be noted that the short-circuit current signal can be expressed as i(t):

[0057] i(t) = i'skac (t)+i' skdc (t) (1)

[0058] where i' skac (t) represents the alternating component of the actual short-circuit current, i' skdc (t) represents the direct component of the actual short-circuit current. Respectively represented by the following formula:

[0059]

[0060]

[0061] In the formula, I SK is the initial effective value of the alternating component of the short-circuit current, σ U is the initial phase angle of the voltage, θ is the impedance angle, R' is the equivalent resistance of the short-circuit point, X' is the equivalent reactance of the short-circuit point, τ SA is the direct component decay time constant, and w is the angular frequency.

[0062] wherein the short-circuit current signal is subjected to wavelet transform by using formula (4), and formula (4) is as follows:

[0063]

[0064] wherein Ψ'(t) is a basic wavelet function, a is a scaling factor, b is a translation factor, t is time, i(t) is a collected short-circuit current signal function, j and k represent the row and column of a matrix respectively, and are integers; a0 represents the initial value of the scaling factor, and b0 represents the initial value of the translation factor.

[0065] The basic wavelet function Ψ'(t) generates a family of functions Ψ a,b (t) through the scaling factor a and the translation factor b, as shown in formula (5).

[0066]

[0067] wherein a, b ∈ R, and a ≠ 0. R represents a real number.

[0068] The continuous wavelet transform of the short-circuit current signal i(t) is:

[0069]

[0070] wherein W f (a, b) refers to the continuous wavelet transform function of the current signal.

[0071] After the above continuous wavelet transform process, the actual short-circuit current direct component time constant τ SA and the actual breaking short-circuit current I Smaxthe last half-wave zero point of the actual breaking T S2 , S1 the actual breaking duration ΔT S . That is, the short-circuit current characteristic parameters include the actual short-circuit current direct current component time constant τ SA , the actual breaking short-circuit current I Smax , the last half-wave zero point of the actual breaking T S1 , T S2 , and the actual breaking duration ΔT S .

[0072] 103. Obtain the characteristic parameters of the high-voltage circuit breaker to be checked.

[0073] It should be noted that the characteristic parameters of the high-voltage circuit breaker to be checked obtained in this embodiment are parameters that can be used to evaluate the breaking capacity of the high-voltage circuit breaker, including breaking current, direct current component time constant, last half-wave zero point of breaking, and duration.

[0074] 104. Determine the breaking capacity of the high-voltage circuit breaker to be checked according to the short-circuit current characteristic parameters and the characteristic parameters.

[0075] It should be noted that by analyzing the real-time obtained short-circuit current characteristic parameters and the characteristic parameters, it is determined whether the breaking capacity of the high-voltage circuit breaker meets the requirements of the direct current component. If it meets the requirements, the checking result output is qualified. If it does not meet the requirements, the checking result output is unqualified.

[0076] The high-voltage circuit breaker breaking capacity checking method provided in this embodiment obtains the short-circuit current signal through the pre-trained short-circuit current recognition model, performs wavelet transform on the short-circuit current signal to obtain the short-circuit current characteristic parameters, obtains the characteristic parameters of the high-voltage circuit breaker to be checked, and determines the breaking capacity of the high-voltage circuit breaker according to the short-circuit current characteristic parameters. Overall, the breaking capacity of the high-voltage circuit breaker under the influence of the direct current component is quickly checked, and the safe operation level of the power system is improved.

[0077] It should be noted that in the high-voltage circuit breaker breaking capacity checking method provided by the present application, the characteristic parameters of the high-voltage circuit breaker obtained can be rated parameters or type test parameters. The high-voltage circuit breaker can be checked using two different parameters. The following Embodiment Two and Embodiment Three will further illustrate the checking method provided by the present application according to different types of characteristic parameters.

[0078] Please refer to Figure 2 , Figure 2 for a schematic diagram of the high-voltage circuit breaker breaking capacity checking method provided by the second aspect of the present application.

[0079] The embodiment is aimed at providing a high-voltage circuit breaker breaking capacity checking method when the acquired characteristic parameters of the high-voltage circuit breaker are rated parameters, and the method comprises the following steps:

[0080] 201. acquiring the short-circuit current signal through the pre-trained short-circuit current identification model;

[0081] In the embodiment, the short-circuit current identification model is used to monitor and identify the system current in the power system in real time, and output the short-circuit current signal when a short circuit occurs.

[0082] The short-circuit current identification model adopts a neural network model, wherein the neural network model can be one of a BP neural network model, an RBF neural network model, etc., and the embodiment is not specifically limited herein.

[0083] In a preferred embodiment, the short-circuit current identification model is a BP neural network model, and the system current and voltage data are taken as inputs, and the short-circuit current signal is taken as an output result.

[0084] S1. The construction steps of the short-circuit current identification model comprise:

[0085] First, a BP neural network model unit structure as shown in Figure 3 is established, wherein x j '(j=1, 2, …n) is the input value of the unit neuron, ω ij '(j=1, 2, …n) represents the connection weight of the unit neuron, ω i0 ' = θ' is the bias of the unit neuron, x0' = -1 is regarded as the input of the unit neuron, θ' is regarded as the special connection weight of the unit neuron, F'() is the transfer function, y i is the output of the unit neuron, and the output formula of the unit neuron is established as follows:

[0086]

[0087] wherein the output y i of the unit neuron can be expressed by the following formula:

[0088]

[0089] In the formula, v i ' is the activation value of the unit neuron i, that is, the weighted sum of all inputs minus the bias value, and e is the exponential.

[0090] Then, the input layer, one or more hidden layers and the output layer of the BP neural network are established through a plurality of unit neurons. Figure 4As can be seen, each input corresponds to a unit neuron in the input layer, and each output corresponds to a unit neuron in the output layer. Layers are fully connected, meaning that a unit neuron in any layer is connected to all nodes in the layer preceding it; units neurons within the same layer are not connected to each other. The current signal propagates progressively layer by layer. For an input layer containing n units neurons, its input is x = (x0, x1, ..., xn). n-1 ) T For a hidden layer containing n1 unit neurons, its output vector is x' = (x'0, x'1, ..., x'). n1-1 ) T For an output layer containing m unit neurons, the output is y = (y0, y1, ..., y2). m-1 ) T The network. If the weights and thresholds between the input layer and the hidden layer are ω', then... ij and θ' jj The weights and thresholds between the hidden layer and the output layer are ω', respectively. jk and θ' k Then we have:

[0091]

[0092] S2: The training steps for the short-circuit current identification model include:

[0093] Obtain sample training data, which consists of system electrical data, including system voltage and system current as system electrical parameters.

[0094] The sample training data is input into the already constructed BP neural network model, and the BP neural network model is trained by performing forward and backward computations on the input samples.

[0095] Before performing forward computation, a training sample for forward computation is pre-defined: Set the input vector Pointing to the input layer of the sensing node, setting the expected response vector. Points to the output layer of the computation node. During forward computation, the input vector... It refers to continuously progressing through the neural network, layer by layer.

[0096] The activation function of neuron j in layer l is:

[0097]

[0098] The output signal of neuron j in layer l is:

[0099]

[0100] where v j (n) represents an activation function of the nth layer, and φ(v j (n)) represents an output signal function.

[0101] During back calculation, the local gradient δ' of the output layer and the hidden layer network can be calculated by the following formula:

[0102]

[0103] wherein, denotes the differential of the independent variable.

[0104] The neuron weight of the lth layer of the network is adjusted as follows:

[0105]

[0106] wherein, n represents the nth sample. When the prediction of one sample is completed, a new sample or a new period sample is inputted again to train the short-circuit current identification model until the voltage and current calculation accuracy reaches the preset accuracy threshold, that is, until the identification accuracy of the short-circuit current identification model meets the preset accuracy threshold requirement, the model training is completed.

[0107] 202. Perform wavelet transform on the short-circuit current signal to obtain a short-circuit current characteristic parameter.

[0108] It should be noted that the specific implementation can refer to step 102, which will not be repeated here.

[0109] 203. Obtain the rated parameters of the high-voltage circuit breaker to be checked.

[0110] It should be noted that the rated parameters include the rated breaking current I NA , the rated short-circuit current direct current component time constant τ NA , the rated breaking last half-wave zero-crossing time T1 and T2, and the rated breaking duration ΔT.

[0111] It can be understood that the rated breaking last half-wave zero-crossing time is the breaking last half-wave zero-crossing time corresponding to the national standard.

[0112] 204. Calculate the ratio of the actual breaking short-circuit current to the rated breaking short-circuit current to obtain a first current ratio.

[0113] It should be noted that the calculation formula of the first current ratio is as follows:

[0114]

[0115] I Smax is the actual breaking short-circuit current, and I NA is the rated breaking current.

[0116] 205、According to the rated short-circuit current DC component time constant, the rated breaking last half-wave zero crossing time, the rated breaking duration, the actual breaking last half-wave zero crossing time, the actual breaking duration and the actual short-circuit current DC component time constant, the first time ratio is calculated.

[0117] The calculation formula of the first time ratio is:

[0118]

[0119] Wherein, τ SA is the actual short-circuit current DC component time constant, are the first time and the second time of the actual breaking last half-wave zero crossing respectively, ΔT S is the actual breaking duration, I NA is the rated breaking current, τ NA is the rated short-circuit current DC component time constant, T1 and T2 are the first time and the second time of the rated breaking last half-wave zero crossing respectively, and ΔT is the rated breaking duration.

[0120] 206、Determine whether the first current ratio is less than or equal to the first time ratio, if yes, determine that the checking result of the breaking capacity of the high-voltage circuit breaker to be checked is qualified.

[0121] It should be noted that when the first current ratio is less than or equal to the first time ratio, it is determined that the checking result of the breaking capacity of the high-voltage circuit breaker to be checked is qualified, that is, the breaking capacity of the high-voltage circuit breaker meets the breaking demand under the DC component. The condition formula of the first current ratio being less than or equal to the first time ratio is shown in the following formula.

[0122]

[0123] The embodiment determines the breaking capacity of the high-voltage circuit breaker under the influence of the DC component through the rated parameters and the short-circuit current characteristic parameters of the high-voltage circuit breaker, realizes the breaking capacity checking of the high-voltage circuit breaker under the influence of the DC component, and provides effective technical support for improving the stability of the power operation level.

[0124] In another preferred embodiment, after step 206, the method further comprises recording the first current ratio of the qualified high-voltage circuit breaker, taking the product of the first current ratio and the rated breaking current as a first checking coefficient, and storing the first checking coefficient in a database. When the next batch of checking is performed, if the characteristic parameter is the rated parameter, the first checking coefficient is obtained from the database, the obtained actual breaking current is compared with the first checking coefficient, and if the actual breaking current is less than or equal to the first checking coefficient, it is determined that the breaking capacity of the high-voltage circuit breaker is qualified, so that the checking of the high-voltage circuit breaker is more quickly realized.

[0125] Please refer to Figure 5 , Figure 5 A schematic diagram of a high-voltage circuit breaker breaking capacity checking method according to a third aspect of the embodiments of the present application is provided.

[0126] The present embodiment provides a high-voltage circuit breaker breaking capacity checking method when the obtained characteristic parameter of the high-voltage circuit breaker is a type test parameter, and the method comprises the following steps:

[0127] 301. Obtain the short-circuit current signal by using the pre-trained short-circuit current recognition model.

[0128] For details, please refer to step 201, which will not be repeated here.

[0129] 302. Perform wavelet transform on the short-circuit current signal to obtain the short-circuit current characteristic parameter.

[0130] It should be noted that for details, please refer to step 302, which will not be repeated here.

[0131] 303. Obtain the type test parameter of the high-voltage circuit breaker to be checked.

[0132] It should be noted that the type test parameter includes the test breaking short-circuit current direct current component time constant τ' A , the test breaking short-circuit current I' max , the test breaking last half-wave zero-crossing time T1' and T2', and the test breaking duration ΔT'.

[0133] In the present embodiment, the high-voltage circuit breaker is subjected to a T100a type test in GB / T1984-2014, and the obtained test parameters are stored in a database. When checking is performed, the corresponding test parameters can be obtained from the database.

[0134] 304. Calculate the ratio of the actual breaking short-circuit current and the test breaking short-circuit current to obtain a second current ratio.

[0135] It should be noted that the calculation formula of the second current ratio is:

[0136]

[0137] 305、According to the test breaking short-circuit current direct current component time constant, the test breaking short-circuit current, the test breaking last half-wave zero-crossing time, the test breaking duration, the actual breaking last half-wave zero-crossing time, the actual breaking duration and the actual short-circuit current direct current component time constant, a second time ratio is calculated.

[0138] It should be noted that the second time ratio calculation formula is:

[0139]

[0140] Wherein, τ SA is the actual short-circuit current direct current component time constant, are the first time and the second time of the actual breaking last half-wave zero-crossing respectively, and ΔT S is the actual breaking duration, τ' A is the test breaking short-circuit current direct current component time constant, T'1 and T'2 are the first time and the second time of the test breaking last half-wave zero-crossing respectively, and ΔT' is the test breaking duration.

[0141] 306、It is judged whether the second current ratio is less than or equal to the second time ratio, if yes, it is determined that the checking result of the breaking capacity of the high-voltage circuit breaker to be checked is qualified.

[0142] It should be noted that when the second current ratio is less than or equal to the second time ratio, it is determined that the checking result of the breaking capacity of the high-voltage circuit breaker to be checked is qualified, that is, the breaking capacity of the high-voltage circuit breaker meets the breaking demand under the direct current component. The condition formula of the second current ratio being less than or equal to the second time ratio is as follows.

[0143]

[0144] In another preferred embodiment, after step 306, it further includes recording the second current ratio of the qualified high-voltage circuit breaker, taking the product of the second current ratio and the test breaking short-circuit current as a second checking coefficient, and storing the second checking coefficient in a database. When the next batch of checking is performed, if the characteristic parameter is the type test parameter, the second checking coefficient is obtained from the database, the actual breaking current obtained by comparison is compared with the second checking coefficient, if the actual breaking current is less than or equal to the second checking coefficient, it is determined that the breaking capacity of the high-voltage circuit breaker is qualified, thereby realizing the checking of the high-voltage circuit breaker more quickly.

[0145] Referring to Figure 6 , Figure 6 is a structural schematic diagram of a high-voltage circuit breaker breaking capacity checking device provided by the fourth aspect of the embodiment of the present application.

[0146] The high-voltage circuit breaker breaking capacity checking device provided by the embodiment comprises:

[0147] The first acquisition module 401 is configured to acquire the short-circuit current signal by using the pre-trained short-circuit current recognition model.

[0148] The transformation module 402 is configured to perform wavelet transformation on the short-circuit current signal to obtain short-circuit current characteristic parameters.

[0149] The second acquisition module 403 is configured to acquire characteristic parameters of the high-voltage circuit breaker to be checked.

[0150] The determination module 404 is configured to determine the breaking capacity of the high-voltage circuit breaker to be checked according to the short-circuit current characteristic parameters and the characteristic parameters.

[0151] In one specific embodiment, the determination module 404 comprises:

[0152] The first calculation unit is configured to calculate a ratio of the actual breaking short-circuit current to the rated breaking short-circuit current to obtain a first current ratio.

[0153] The second calculation unit is configured to calculate a first time ratio according to the rated short-circuit current direct current component time constant, the rated breaking last half-wave zero-crossing time, the rated breaking duration, the actual breaking last half-wave zero-crossing time, the actual breaking duration, and the actual short-circuit current direct current component time constant.

[0154] The first judgment unit is configured to determine whether the first current ratio is less than or equal to the first time ratio, and if so, determine that the checking result of the breaking capacity of the high-voltage circuit breaker to be checked is qualified.

[0155] In another specific embodiment, the determination module 404 comprises:

[0156] The third calculation unit is configured to calculate a ratio of the actual breaking short-circuit current to the test breaking short-circuit current to obtain a second current ratio.

[0157] The fourth calculation unit is configured to calculate a second time ratio according to the test breaking short-circuit current direct current component time constant, the test breaking short-circuit current, the test breaking last half-wave zero-crossing time, the test breaking duration, the actual breaking last half-wave zero-crossing time, the actual breaking duration, and the actual short-circuit current direct current component time constant.

[0158] The second judgment unit is configured to determine whether the second current ratio is less than or equal to the second time ratio, and if so, determine that the checking result of the breaking capacity of the high-voltage circuit breaker to be checked is qualified.

[0159] Another embodiment of the present application also provides an electronic device, the device comprising a processor and a memory:

[0160] The memory is configured to store program code and transmit the program code to the processor.

[0161] The processor is configured to execute the method according to any one of the above embodiments according to instructions in the program code.

[0162] Another embodiment of the present application also provides a computer readable storage medium, the computer readable storage medium is configured to store program code, the program code is configured to execute the method according to any one of the above embodiments.

[0163] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0164] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0165] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment scheme.

[0166] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each functional unit can be a separate physical unit, or two or more functional units can be integrated in one processing unit. The integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0167] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or say the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0168] The terms "first", "second", "third", "fourth" and the like in the description of the present application and the above-mentioned drawings, if any, are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0169] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for verifying the breaking capacity of a high-voltage circuit breaker, characterized in that, The method includes: Short-circuit current signals are obtained by using a pre-trained short-circuit current identification model; Wavelet transform is performed on the short-circuit current signal to obtain short-circuit current characteristic parameters; Obtain the characteristic parameters of the high-voltage circuit breaker to be checked; The breaking capacity of the high-voltage circuit breaker to be checked is determined based on the short-circuit current characteristic parameters and the characteristic parameters.

2. The method according to claim 1, characterized in that, The characteristic parameters are rated parameters, which include: rated breaking current, rated short-circuit current DC component time constant, rated breaking time of the last half-wave zero crossing point, and rated breaking duration.

3. The method according to claim 1, characterized in that, The characteristic parameters are type test parameters; The type test parameters include: the DC component time constant of the test interruption short-circuit current, the test interruption short-circuit current, the zero-crossing time of the last half-wave of the test interruption, and the test interruption duration.

4. The method according to claim 2, characterized in that, The short-circuit current characteristic parameters include: actual interrupted short-circuit current, actual interruption time of the last half-wave zero crossing point, actual interruption duration, and actual short-circuit current DC component time constant. The step of determining the breaking capacity of the high-voltage circuit breaker to be checked based on the short-circuit current characteristics and the characteristic parameters includes: Calculate the ratio of the actual short-circuit breaking current to the rated breaking current to obtain the first current ratio. The first time ratio is calculated based on the rated short-circuit current DC component time constant, the zero-crossing time of the last half-wave of the rated interruption, the rated interruption duration, the zero-crossing time of the last half-wave of the actual interruption, the actual interruption duration, and the actual short-circuit current DC component time constant. Determine whether the first current ratio is less than or equal to the first time ratio. If so, determine that the verification result of the breaking capacity of the high-voltage circuit breaker to be verified is qualified.

5. The method according to claim 3, characterized in that, The short-circuit current characteristic parameters include: actual interrupted short-circuit current, actual interruption time of the last half-wave zero crossing point, actual interruption duration, and actual short-circuit current DC component time constant. The step of determining the breaking capacity of the high-voltage circuit breaker to be checked based on the short-circuit current characteristics and the characteristic parameters includes: Calculate the ratio of the actual short-circuit breaking current to the test short-circuit breaking current to obtain the second current ratio; The second time ratio is calculated based on the time constant of the DC component of the short-circuit current during the test interruption, the short-circuit current during the test interruption, the zero-crossing time of the last half-wave of the test interruption, the duration of the test interruption, the zero-crossing time of the last half-wave of the actual interruption, the duration of the actual interruption, and the time constant of the DC component of the actual short-circuit current. Determine whether the second current ratio is less than or equal to the second time ratio. If so, determine that the verification result of the breaking capacity of the high-voltage circuit breaker to be verified is qualified.

6. The method according to claim 4, characterized in that, The formula for calculating the first time ratio is: ； in, The time constant of the DC component of the actual short-circuit current. , These are the first and second moments when the last major half-wave of the actual interruption crosses zero, respectively. This refers to the actual interruption duration. Rated breaking current, The time constant of the DC component of the rated short-circuit current. , These are the first and second moments when the last major half-wave of the rated breaking point crosses zero, respectively. This is the rated interruption duration.

7. The method according to claim 5, characterized in that, The formula for calculating the second time ratio is: ； in, The time constant of the DC component of the actual short-circuit current. , These are the first and second moments when the last major half-wave of the actual interruption crosses zero, respectively. This refers to the actual interruption duration. The time constant of the DC component of the short-circuit current during the test interruption is given. , These are the first and second moments when the last major half-wave of the experimental interruption crosses zero, respectively. The duration of the test interruption.

8. A high-voltage circuit breaker breaking capacity verification device, characterized in that, The device includes: The first acquisition module is used to acquire short-circuit current signals through a pre-trained short-circuit current identification model; The transformation module is used to perform wavelet transform on the short-circuit current signal to obtain short-circuit current characteristic parameters; The second acquisition module is used to acquire the characteristic parameters of the high-voltage circuit breaker to be checked. The determination module is used to determine the breaking capacity of the high-voltage circuit breaker to be checked based on the short-circuit current characteristic parameters and the characteristic parameters.

9. An electronic device, characterized in that, The device includes a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the method as described in any one of claims 1-7 according to instructions in the program code.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store program code for performing the method as described in any one of claims 1-7.

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