Method, device and computer equipment for determining the operating mode of a current transformer

Abstract

The application relates to a current transformer operation mode judgment method and device and a computer device. The method comprises the following steps: if it is detected that a power transmission line corresponding to a current transformer is closed in a no-load state, the current transformer is controlled to operate in a current operation mode; an actual closing current of the power transmission line when the current transformer operates in the current operation mode is acquired; and the current operation mode of the current transformer is determined according to the actual closing current and theoretical closing currents of the power transmission line when the current transformer operates in each selectable operation mode. The operation mode of the current transformer can be determined in the case that the power transmission line is in a no-load state.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a method, apparatus and computer equipment for determining the operating mode of a current transformer. Background Technology

[0002] With the development of power systems, electricity impacts people's lives in various ways. Therefore, the safe operation of power systems is of great significance. Current transformers are important equipment in power systems, primarily functioning to linearly and proportionally transform large-amplitude currents into smaller-amplitude currents, facilitating the operation of secondary equipment such as protection, measurement, and control devices. The accuracy of the current transformer's output current directly affects the accuracy of power grid protection, measurement, and control, and is crucial for the safe operation of the power grid.

[0003] However, proper connection of the current transformer is essential to ensure a stable output current. Incorrect connection can lead to inaccurate measurement of fault current during a fault, significantly impacting the safety and stability of the power grid. Therefore, the operation of the current transformer needs to be tested after a new line is put into operation.

[0004] Current testing methods require a sufficiently large load current. The load current measured by a current transformer is compared with a known current to determine the operating mode of the current transformer. However, most newly commissioned lines are unloaded, with no load current. Therefore, how to test the operating mode of the current transformer under unloaded conditions has become an urgent problem to be solved. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, device, and computer equipment for determining the operating mode of a current transformer that can measure the operating mode of the current transformer under no-load conditions, in order to address the above-mentioned technical problems.

[0006] Firstly, this application provides a method for determining the operating mode of a current transformer. The method includes:

[0007] If it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions, the current transformer is controlled to operate in the current operating mode.

[0008] Obtain the actual closing current of the transmission line when the current transformer is operating in the current mode;

[0009] The current operating mode of the current transformer is determined based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable mode.

[0010] In one embodiment, the optional operating modes include: the current transformer operating in a forward connection mode, the current transformer operating in a reverse connection mode, the current transformer operating in a reverse connection mode with phase A and phase B electricity, and the current transformer operating in a reverse connection mode with phase A and phase C electricity.

[0011] In one embodiment, the current operating mode of the current transformer is determined based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable operating mode, including:

[0012] Determine the Fréchet distance between the theoretical closing current and the actual closing current of the transmission line when the current transformer is operating in each selectable mode;

[0013] The current operating mode of the current transformer is determined based on the Fréchet distance between the theoretical closing current and the actual closing current.

[0014] In one embodiment, the current operating mode of the current transformer is determined based on the Fréchet distance between each theoretical closing current and the actual closing current, including:

[0015] The optional operating mode corresponding to the minimum Frescher distance is taken as the current operating mode of the current transformer.

[0016] In one embodiment, the current operating mode of the current transformer is determined based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable operating mode, including:

[0017] Based on the frequency of actual closing current, the theoretical closing current of the transmission line is discretized in time when the current transformer is running in each selectable operating mode to obtain the processed theoretical closing current.

[0018] The current operating mode of the current transformer is determined based on the actual closing current and the processed theoretical closing current.

[0019] In one embodiment, detecting that the transmission line corresponding to the current transformer is closed under no-load conditions includes:

[0020] If no load current is detected on the transmission line corresponding to the current transformer, it is determined that the transmission line is closed under no-load conditions.

[0021] Secondly, this application also provides a device for determining the operating mode of a current transformer. The device includes:

[0022] The operation control module is used to control the current transformer to operate in the current operating mode if it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions.

[0023] The current acquisition module is used to acquire the actual closing current of the transmission line when the current transformer is running in the current operating mode.

[0024] The operation determination module is used to determine the current operating mode of the current transformer based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable operating mode.

[0025] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0026] If it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions, the current transformer is controlled to operate in the current operating mode.

[0027] Obtain the actual closing current of the transmission line when the current transformer is operating in the current mode;

[0028] The current operating mode of the current transformer is determined based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable mode.

[0029] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0030] If it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions, the current transformer is controlled to operate in the current operating mode.

[0031] Obtain the actual closing current of the transmission line when the current transformer is operating in the current mode;

[0032] The current operating mode of the current transformer is determined based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable mode.

[0033] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0034] If it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions, the current transformer is controlled to operate in the current operating mode.

[0035] Obtain the actual closing current of the transmission line when the current transformer is operating in the current mode;

[0036] The current operating mode of the current transformer is determined based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable mode.

[0037] The above-mentioned method, device, and computer equipment for determining the operating mode of current transformers. By comparing the actual closing current of the transmission line under no-load conditions with the theoretical closing current when the current transformer is operating in its current mode, the current operating mode of the current transformer can be determined quickly and accurately under no-load conditions. Attached Figure Description

[0038] Figure 1 This is an application environment diagram of a current transformer operation mode determination method in one embodiment;

[0039] Figure 2 This is a flowchart illustrating a method for determining the operating mode of a current transformer in one embodiment;

[0040] Figure 3 This is a circuit diagram of the closing circuit of a transmission line in one embodiment;

[0041] Figure 4 This is a flowchart illustrating the process of determining the current transformer's current operating mode based on the Fraser distance in one embodiment.

[0042] Figure 5 This is a schematic diagram of the process of discretizing sampled data in one embodiment;

[0043] Figure 6 This is a flowchart illustrating the method for determining the operating mode of a current transformer in another embodiment;

[0044] Figures 7a-7e This is a schematic diagram of the sampled waveforms of the actual closing current and the theoretical closing current in one embodiment;

[0045] Figure 8 This is a structural block diagram of a current transformer operation mode determination device in one embodiment;

[0046] Figure 9 This is a structural block diagram of the current transformer operation mode determination device in another embodiment;

[0047] Figure 10 This is a structural block diagram of the current transformer operation mode determination device in another embodiment;

[0048] Figure 11 This is a structural block diagram of the current transformer operation mode determination device in another embodiment;

[0049] Figure 12This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0051] The method for determining the operating mode of a current transformer provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, in one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows. Figure 1 As shown. The computer device includes a processor, memory, and network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores data required for processing alarm data. The network interface communicates with external terminals via a network connection. When executed by the processor, the computer program implements the current transformer operation mode determination method shown in any of the following embodiments.

[0052] In one embodiment, such as Figure 2 As shown, a method for determining the operating mode of a current transformer is provided, which is then applied to... Figure 1 Taking a computer device as an example, the explanation includes the following steps:

[0053] S201 If it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions, the current transformer is controlled to operate in the current operating mode.

[0054] If it is detected that there is no load current on the transmission line corresponding to the current transformer, it is determined that the transmission line is closed under no-load conditions.

[0055] The no-load state means that the transmission line where the current transformer is located is not energized.

[0056] Optionally, a current sensor can be used to detect whether the current in the transmission line where the current transformer is located exceeds a preset current threshold. If the detected current does not exceed the preset current threshold, it is determined that there is no load current in the transmission line corresponding to the current transformer, and the transmission line is closed under no-load conditions. At this time, the current transformer is controlled to operate in the current operating mode, and the current operating mode of the current transformer is unknown.

[0057] It should be noted that since the transmission line where the current transformer is located has a built-in power source, the current of the transmission line is not zero even when it is unloaded. However, the current is small. Therefore, it is sufficient to detect that the current of the transmission line is less than the preset current threshold to determine that the transmission line is unloaded.

[0058] S202, obtain the actual closing current of the transmission line when the current transformer is running in the current operating mode.

[0059] The actual closing current is the current in the transmission line after the transmission line is closed when the current transformer is operating in the current mode.

[0060] Optionally, the current detection device can be connected to the load end of the transmission line, and the current detected by the current detection device can be sampled at a preset frequency as the actual closing current. The current detection device can be an ammeter.

[0061] S203. Based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable operating mode, determine the current operating mode of the current transformer.

[0062] The optional operating modes include: current transformers operating with forward connection, current transformers operating with reverse connection, current transformers operating with phase A and phase B connected in reverse, and current transformers operating with phase A and phase C connected in reverse. These four different operating modes correspond to four different theoretical closing currents: the first theoretical closing current, the second theoretical closing current, the third theoretical closing current, and the fourth theoretical closing current.

[0063] The theoretical closing current can be obtained by analyzing the closing circuit diagram of the transmission line after the current transformer is connected to the transmission line.

[0064] Specifically, such as Figure 3 As shown, the closing process of a transmission line can be analyzed, and the closing voltage U ac And the line parameters are known quantities, the closing current I is an unknown quantity, and the closing voltage, closing current and line parameters satisfy the following differential equation (1):

[0065]

[0066] Among them, U ac I is the closing voltage, C is the closing current, L is the capacitance, and R is the resistance.

[0067] Closing voltage U ac Related to the closing angle, specifically: U ac= k·cos(ωt), where ω is the angular velocity of the signal, and k is a known parameter, representing the closing voltage U. ac Substituting the above formulas related to the closing angle into equation (1) to solve for the zero-sequence current I, we obtain the following formulas (2)-(8):

[0068]

[0069]

[0070]

[0071]

[0072]

[0073]

[0074]

[0075] Among them, I m I is the amplitude of the steady-state signal. k U is the amplitude of the transient signal, α is the attenuation factor of the transient signal, ω is the angular velocity of the signal, ω1 is the angular velocity of the transient signal, and U ac I is the closing voltage, φ is the closing current, φ is the closing phase angle, φ1 is the first closing phase angle during the closing process, φ2 is the second closing phase angle during the closing process, C is the capacitor, L is the inductor, and R is the resistor.

[0076] Optionally, by substituting the amplitude of the transient signal, the closing phase angle, and the angular velocity of the transient signal when the current transformer is connected to the transmission line in different operating modes into the above formulas (2)-(8), the first theoretical closing current, the second theoretical closing current, the third theoretical closing current, and the fourth theoretical closing current can be obtained.

[0077] Optionally, the current operating mode of the current transformer in the transmission line can be determined based on the measured actual closing current and the calculated first theoretical closing current, second theoretical closing current, third theoretical closing current and fourth theoretical closing current.

[0078] Specifically, the similarity between the actual closing current and the first, second, third, and fourth theoretical closing currents is calculated, and the current transformer's current operating mode in the transmission line is determined based on the magnitude of the four similarity values. For example, the operating mode corresponding to the theoretical closing current with the highest similarity can be used as the current transformer's current operating mode.

[0079] In the above embodiments, when the transmission line is in an unloaded state, the actual closing current of the transmission line is detected, and the theoretical closing current is calculated. Based on the actual closing current and the theoretical closing current, the current operating mode of the current transformer connected to the transmission line is determined. This method can detect the current transformer's current operating mode even when the transmission line is unloaded, without requiring a load current in the transmission line.

[0080] Based on the above embodiments, such as Figure 4 As shown in this embodiment, the determination of the operating mode of the current transformer is explained in more detail. Based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable operating mode, the current operating mode of the current transformer is determined, including:

[0081] S401, determine the Fréchet distance between the theoretical closing current and the actual closing current of the transmission line when the current transformer is operating in each selectable mode.

[0082] The Frescher distance is a numerical value that characterizes the similarity between two models. The smaller the value, the higher the similarity between the two models. In this embodiment, it can be used to characterize the similarity between the actual closing current and the theoretical closing current. The theoretical closing current includes the first theoretical closing current, the second theoretical closing current, the third theoretical closing current, and the fourth theoretical closing current.

[0083] For example, the first theoretical closing current is taken from the theoretical closing current, and the actual closing current curve L with m sampling points is obtained. a = <p a1 ,p a2 ,…,p am >and the first theoretical closing current curve L with m sampling points b = b1 ,q b2 ,…,q bm >Combined, we obtain sequence L:

[0084] L = < (p a1 ,q b1 ), (p a2 ,q b2 ), (p am ,q bm >

[0085] The Fréchet distance between the actual closing current curve and the first theoretical closing current curve is calculated based on the sequence L. The calculation method is shown in the following formulas (9)-(10):

[0086]

[0087] F(L​a ,L b )=min||L|| (10)

[0088] Among them, F(L a ,L b Let be the Fréchet distance between the two curves. ||L|| is L a and L b The length value between, L a The actual closing current curve, L b The first theoretical closing current curve is given, and d() is the function formula for calculating the length value.

[0089] Optionally, the Friesian distance between the actual closing current curve and the first theoretical closing current curve can be used as the first Friesian distance.

[0090] In the same manner, the second Fréchet distance between the actual closing current curve and the second theoretical closing current curve, the second and third Fréchet distances between the actual closing current curve and the third theoretical closing current curve, and the fourth Fréchet distance between the actual closing current curve and the fourth theoretical closing current curve are calculated.

[0091] S402 determines the current operating mode of the current transformer based on the Fréchet distance between the theoretical closing current and the actual closing current.

[0092] Among them, the optional operating mode corresponding to the minimum Frescher distance is taken as the current operating mode of the current transformer.

[0093] Optionally, the first, second, third, and fourth Fréchet distances are compared, and the optional operating mode corresponding to the Fréchet distance with the smallest value is the current operating mode of the mutual inductor.

[0094] For example, in this embodiment, if the value of the first Fraser distance is the smallest, that is, the actual closing current curve is most similar to the first theoretical closing current curve, and the optional operating mode corresponding to the first theoretical closing current is the current transformer operating in the forward connection mode, it can be determined that the current transformer is currently operating in the forward connection mode.

[0095] Similarly, if the second Fraser distance is the smallest, the current transformer is determined to be operating in reverse connection mode; if the third Fraser distance is the smallest, the current transformer is determined to be operating in reverse connection mode with phase A and phase B; if the fourth Fraser distance is the smallest, the current transformer is determined to be operating in reverse connection mode with phase A and phase C.

[0096] In this embodiment, the Frescher distance between the actual closing current and the theoretical closing current is calculated, and the four Frescher distances are compared to determine the current transformer's current operating mode. This method only requires the algorithm to calculate and compare the distances, without the need for manual intervention, which greatly improves the accuracy and efficiency of determining the current transformer's current operating mode.

[0097] Based on the above embodiments, such as Figure 5 As shown, this illustrates how to preprocess the collected data before calculating the Fraser distance. Therefore, based on the actual closing current and the theoretical closing current of the transmission line when the current transformer operates in various selectable modes, the current transformer's current operating mode is determined. This also includes:

[0098] S501, based on the frequency of actual closing current, performs time discretization processing on the theoretical closing current of the transmission line when the current transformer is running in each selectable operating mode, to obtain the processed theoretical closing current.

[0099] For example, when sampling the actual closing current, the sampling data of the closing current during the sampling period (such as the first 10ms) is usually recorded. Since the closing current is a gradually decaying sinusoidal current, its amplitude becomes smaller as time goes on, and the data becomes less accurate. Therefore, we only take the sample data of the earlier preset period (such as the first 5ms) as the final actual closing current. The theoretical closing current is usually in seconds. In order to facilitate the calculation of the Frescher distance between the actual closing current and the theoretical closing current, we need to perform time discretization processing on the theoretical closing current and take the theoretical closing current value of the first 5ms as the refined theoretical closing current.

[0100] S502 determines the current operating mode of the current transformer based on the actual closing current and the processed theoretical closing current.

[0101] Optionally, the Friesian distance between the actual closing current and the four processed theoretical closing currents is calculated, and the current operating mode of the current transformer is determined based on the relationship between the first Friesian distance, the second Friesian distance, the third Friesian distance and the fourth Friesian distance.

[0102] The above embodiments, by discretizing the theoretical closing current, ensure that the sampling frequency of the actual closing current and the theoretical closing current is the same, which greatly increases the convenience of Fréchet distance calculation and ultimately increases the efficiency of determining the current transformer's current operating mode.

[0103] To more comprehensively demonstrate this solution, this embodiment presents an optional method for determining the operating mode of a current transformer, such as... Figure 6 As shown:

[0104] S601, if it is detected that there is no load current in the transmission line corresponding to the current transformer, then it is determined that the transmission line is closed under no-load conditions.

[0105] S602 controls the current transformer to operate in the current mode.

[0106] S603, obtains the actual closing current of the transmission line when the current transformer is running in the current operating mode.

[0107] S604, based on the frequency of actual closing current, performs time discretization processing on the theoretical closing current of the transmission line when the current transformer is running in each selectable operating mode, to obtain the processed theoretical closing current.

[0108] S605, determine the Fréchet distance between the theoretical closing current and the actual closing current of the transmission line after processing when the current transformer is running in each selectable operating mode.

[0109] S606 sets the optional operating mode corresponding to the minimum Frescher distance as the current operating mode of the current transformer.

[0110] The specific processes of S601-S606 described above can be found in the description of the above method embodiments. Their implementation principles and technical effects are similar, and will not be repeated here.

[0111] For example, such as Figures 7a-7e As shown, Figure 7a The waveform of the actual closing current is shown in the sampled current diagram. Figures 7b-7e The sampling current waveform diagram is the theoretical closing current. The corresponding operating modes of the current transformer are: current transformer operating in forward connection mode, current transformer operating in reverse connection mode, current transformer operating in reverse connection mode of phase A and phase B, and current transformer operating in reverse connection mode of phase A and phase C.

[0112] Based on the calculations using formulas (9)-(10) above, it can be concluded that... Figure 7a and Figure 7b The Frechet distance between them is the smallest, that is Figure 7a and Figure 7b Most similar, i.e., judgment Figure 7b The corresponding operating mode: The current transformer operates in the forward connection mode, which is the current operating mode of the current transformer.

[0113] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0114] Based on the same inventive concept, this application also provides an operating mode determination device for a current transformer used to implement the above-described method for determining the operating mode of a current transformer. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more embodiments of the operating mode determination device for current transformers provided below can be found in the limitations of the current transformer operating mode determination method described above, and will not be repeated here.

[0115] In one embodiment, such as Figure 8 As shown, a device for determining the operating mode of a current transformer is provided, comprising: an operating control module 80, a current acquisition module 81, and an operating determination module 82, wherein:

[0116] The operation control module 80 is used to control the current transformer to operate in the current operating mode if it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions.

[0117] The current acquisition module 81 is used to acquire the actual closing current of the transmission line when the current transformer is running in the current operating mode.

[0118] The operation determination module 82 is used to determine the current operating mode of the current transformer based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is running in each selectable operating mode.

[0119] In another embodiment, the above Figure 8 The operation determination module 82 in the middle includes the following optional operation modes:

[0120] The current transformer can operate in the forward connection mode, the reverse connection mode, the A-phase and B-phase reverse connection mode, and the A-phase and C-phase reverse connection mode.

[0121] In another embodiment, such as Figure 9 As shown above, Figure 8 The operation determination module 82 in the middle also includes:

[0122] The distance determination unit 820 is used to determine the Frescher distance between the theoretical closing current and the actual closing current of the transmission line when the current transformer is operating in each selectable operating mode.

[0123] The first determining unit 821 is used to determine the current operating mode of the current transformer based on the Frescher distance between each theoretical closing current and the actual closing current.

[0124] In another embodiment, the above Figure 9 The operation determination unit 821 in the middle is specifically used for:

[0125] The optional operating mode corresponding to the minimum Frescher distance is taken as the current operating mode of the current transformer.

[0126] In another embodiment, such as Figure 10 As shown above, Figure 8 The runtime determination module 82 also includes:

[0127] The discrete processing unit 822 is used to perform time discretization processing on the theoretical closing current of the transmission line when the current transformer is running in each selectable operating mode, based on the frequency of the actual closing current. The result is the processed theoretical closing current.

[0128] The second determining unit 823 is used to determine the current operating mode of the current transformer based on the actual closing current and the processed theoretical closing current.

[0129] In another embodiment, such as Figure 11 As shown above, Figure 8 The current transformer operation mode determination device 8 also includes:

[0130] The no-load determination module 83 is used to determine whether the transmission line is closed under no-load conditions.

[0131] The various modules in the aforementioned current transformer operation mode determination device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0132] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 12As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a method for determining the operating mode of a current transformer. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0133] Those skilled in the art will understand that Figure 12 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0134] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0135] If it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions, the current transformer is controlled to operate in the current operating mode.

[0136] Obtain the actual closing current of the transmission line when the current transformer is operating in the current mode;

[0137] The current operating mode of the current transformer is determined based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable mode.

[0138] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0139] The current transformer can operate in the forward connection mode, the reverse connection mode, the A-phase and B-phase reverse connection mode, and the A-phase and C-phase reverse connection mode.

[0140] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0141] Determine the Fréchet distance between the theoretical closing current and the actual closing current of the transmission line when the current transformer is operating in each selectable mode;

[0142] The current operating mode of the current transformer is determined based on the Fréchet distance between the theoretical closing current and the actual closing current.

[0143] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0144] The optional operating mode corresponding to the minimum Frescher distance is taken as the current operating mode of the current transformer.

[0145] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0146] Based on the frequency of actual closing current, the theoretical closing current of the transmission line is discretized in time when the current transformer is running in each selectable operating mode to obtain the processed theoretical closing current.

[0147] The current operating mode of the current transformer is determined based on the actual closing current and the processed theoretical closing current.

[0148] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0149] If no load current is detected on the transmission line corresponding to the current transformer, it is determined that the transmission line is closed under no-load conditions.

[0150] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0151] If it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions, the current transformer is controlled to operate in the current operating mode.

[0152] Obtain the actual closing current of the transmission line when the current transformer is operating in the current mode;

[0153] The current operating mode of the current transformer is determined based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable mode.

[0154] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0155] The current transformer can operate in the forward connection mode, the reverse connection mode, the A-phase and B-phase reverse connection mode, and the A-phase and C-phase reverse connection mode.

[0156] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0157] Determine the Fréchet distance between the theoretical closing current and the actual closing current of the transmission line when the current transformer is operating in each selectable mode;

[0158] The current operating mode of the current transformer is determined based on the Fréchet distance between the theoretical closing current and the actual closing current.

[0159] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0160] The optional operating mode corresponding to the minimum Frescher distance is taken as the current operating mode of the current transformer.

[0161] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0162] Based on the frequency of actual closing current, the theoretical closing current of the transmission line is discretized in time when the current transformer is running in each selectable operating mode to obtain the processed theoretical closing current.

[0163] The current operating mode of the current transformer is determined based on the actual closing current and the processed theoretical closing current.

[0164] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0165] If no load current is detected on the transmission line corresponding to the current transformer, it is determined that the transmission line is closed under no-load conditions.

[0166] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0167] If it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions, the current transformer is controlled to operate in the current operating mode.

[0168] Obtain the actual closing current of the transmission line when the current transformer is operating in the current mode;

[0169] The current operating mode of the current transformer is determined based on the actual closing current and the theoretical closing current of the transmission line when the current transformer is operating in each selectable mode.

[0170] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0171] The current transformer can operate in the forward connection mode, the reverse connection mode, the A-phase and B-phase reverse connection mode, and the A-phase and C-phase reverse connection mode.

[0172] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0173] Determine the Fréchet distance between the theoretical closing current and the actual closing current of the transmission line when the current transformer is operating in each selectable mode;

[0174] The current operating mode of the current transformer is determined based on the Fréchet distance between the theoretical closing current and the actual closing current.

[0175] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0176] The optional operating mode corresponding to the minimum Frescher distance is taken as the current operating mode of the current transformer.

[0177] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0178] Based on the frequency of actual closing current, the theoretical closing current of the transmission line is discretized in time when the current transformer is running in each selectable operating mode to obtain the processed theoretical closing current.

[0179] The current operating mode of the current transformer is determined based on the actual closing current and the processed theoretical closing current.

[0180] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0181] If no load current is detected on the transmission line corresponding to the current transformer, it is determined that the transmission line is closed under no-load conditions.

[0182] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0183] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0184] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for determining the operating mode of a current transformer, characterized in that, The method includes: If it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions, the current transformer is controlled to operate in the current operating mode. The actual closing current of the transmission line is obtained when the current transformer is operating in the current mode. The Fréchet distance between the theoretical closing current and the actual closing current of the transmission line is determined when the current transformer is operating in each selectable mode. The current operating mode of the current transformer is determined based on the Fréchet distance between each theoretical closing current and the actual closing current.

2. The method according to claim 1, characterized in that, The optional operating modes include: the current transformer operating in the forward connection mode, the current transformer operating in the reverse connection mode, the current transformer operating in the reverse connection mode of phase A and phase B, and the current transformer operating in the reverse connection mode of phase A and phase C.

3. The method according to claim 1, characterized in that, Based on the Fréchet distance between each theoretical closing current and the actual closing current, the current transformer's current operating mode is determined, including: The optional operating mode corresponding to the minimum Frescher distance is taken as the current operating mode of the current transformer.

4. The method according to claim 1, characterized in that, Based on the actual closing current and the theoretical closing current of the transmission line when the current transformer operates in each selectable operating mode, the current operating mode of the current transformer is determined, including: Based on the frequency of the actual closing current, when the current transformer is running in each selectable operating mode, the theoretical closing current of the transmission line is discretized in time to obtain the processed theoretical closing current. Based on the actual closing current and the processed theoretical closing current, the current transformer's current operating mode is determined.

5. The method according to claim 1, characterized in that, The detection that the transmission line corresponding to the current transformer is closed under no-load conditions includes: If it is detected that there is no load current on the transmission line corresponding to the current transformer, it is determined that the transmission line is closed under no-load conditions.

6. The method according to claim 5, characterized in that, The detection that there is no load current on the transmission line corresponding to the current transformer includes: If the current in the transmission line where the current transformer is located is detected to be less than the preset current threshold, it is determined that there is no load current in the transmission line corresponding to the current transformer.

7. A device for determining the operating mode of a current transformer, characterized in that, The device includes: The operation control module is used to control the current transformer to operate in the current operating mode if it is detected that the transmission line corresponding to the current transformer is closed under no-load conditions. The current acquisition module is used to acquire the actual closing current of the transmission line when the current transformer is running in the current operating mode. The operation determination module is used to determine the Fréchet distance between the theoretical closing current and the actual closing current of the transmission line when the current transformer is operating in each selectable operating mode; and to determine the current operating mode of the current transformer based on the Fréchet distance between each theoretical closing current and the actual closing current.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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