Current transformer secondary circuit current differential protection method and device, computer equipment, storage medium and computer program product

Abstract

The invention relates to a current transformer secondary circuit current differential protection method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: respectively carrying out weighted summation processing on first initial three-phase current data and second initial three-phase current data of a secondary circuit of a current transformer to be analyzed to obtain first zero-sequence current data and second zero-sequence current data, and determining corresponding first target flag bit information and second target flag bit information; determining first compensated three-phase current data and second compensated three-phase current data, and further determining first target three-phase current data corresponding to the first target flag bit information and second target three-phase current data corresponding to the second target flag bit information; and according to the first target three-phase current data and the second target three-phase current data, performing current differential protection processing on the secondary circuit of the current transformer. By adopting the method, the operation stability of the secondary circuit of the current transformer can be improved.

Description

Technical Field

[0001] The present application relates to the field of power grid technology, and in particular to a current transformer secondary circuit current differential protection method, device, computer equipment, computer readable storage medium and computer program product. Background Art

[0002] At present, in order to ensure the safe operation of the power system, it is crucial to protect the secondary circuit of the current transformer.

[0003] In the traditional technology, manual protection is generally used to protect the secondary circuit of the current transformer; however, this manual protection method is prone to false protection operation, resulting in low stability of the secondary circuit operation of the current transformer. Summary of the invention

[0004] Based on this, it is necessary to provide a current transformer secondary circuit current differential protection method, device, computer equipment, computer readable storage medium and computer program product that can improve the stability of the secondary circuit operation of the current transformer in response to the above technical problems.

[0005] In a first aspect, the present application provides a current transformer secondary circuit current differential protection method, comprising:

[0006] Acquire first initial three-phase current data and second initial three-phase current data of a secondary circuit of a current transformer to be analyzed;

[0007] Performing weighted sum processing on the first initial three-phase current data and the second initial three-phase current data respectively to obtain first zero-sequence current data and second zero-sequence current data of the secondary circuit of the current transformer;

[0008] Determine first target flag bit information and second target flag bit information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively;

[0009] Determine, according to the first initial three-phase current data and the second zero-sequence current data, first compensated three-phase current data corresponding to the first initial three-phase current data, and determine, according to the second initial three-phase current data and the first zero-sequence current data, second compensated three-phase current data corresponding to the second initial three-phase current data;

[0010] Determine the first target three-phase current data corresponding to the first target flag information from the first initial three-phase current data and the first compensated three-phase current data, and determine the second target three-phase current data corresponding to the second target flag information from the second initial three-phase current data and the second compensated three-phase current data;

[0011] According to the first target three-phase current data and the second target three-phase current data, current differential protection processing is performed on the secondary circuit of the current transformer.

[0012] In one embodiment, determining first target flag information and second target flag information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively includes:

[0013] Determine first initial flag information and second initial flag information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively;

[0014] The first initial flag bit information and the second initial flag bit information are updated respectively to obtain the first target flag bit information and the second target flag bit information corresponding to the secondary circuit of the current transformer.

[0015] In one embodiment, determining the first initial flag information and the second initial flag information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively includes:

[0016] Determine a first zero-sequence current effective value corresponding to the first zero-sequence current data, and a second zero-sequence current effective value corresponding to the second zero-sequence current data, and obtain a zero-sequence current threshold value corresponding to the secondary circuit of the current transformer;

[0017] The first initial flag information is determined according to the difference between the first zero-sequence current effective value and the zero-sequence current threshold value, and the second initial flag information is determined according to the difference between the second zero-sequence current effective value and the zero-sequence current threshold value.

[0018] In one embodiment, the updating process of the first initial flag information and the second initial flag information respectively to obtain the first target flag information and the second target flag information corresponding to the secondary circuit of the current transformer includes:

[0019] Performing an XOR operation on the first initial flag bit information and the second initial flag bit information to obtain an XOR operation result;

[0020] The second initial flag information and the XOR operation result are processed by AND operation to obtain the first target flag information, and the first initial flag information and the XOR operation result are processed by AND operation to obtain the second target flag information.

[0021] In one of the embodiments, after determining the first target flag information and the second target flag information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively, the method further includes:

[0022] In a case where the first target flag information is preset flag information, and / or in a case where the second target flag information is the preset flag information, determining the disconnection position information corresponding to the secondary circuit of the current transformer;

[0023] Generate alarm information corresponding to the secondary circuit of the current transformer according to the disconnection position information;

[0024] The alarm information is sent to a target terminal associated with the secondary circuit of the current transformer.

[0025] In one embodiment, performing current differential protection processing on the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data includes:

[0026] Determining a differential current and a braking current corresponding to the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data;

[0027] Obtaining the starting current and braking coefficient corresponding to the secondary circuit of the current transformer;

[0028] When the differential current, the braking current, the starting current and the braking coefficient all meet preset conditions, current differential protection processing is performed on the secondary circuit of the current transformer.

[0029] In a second aspect, the present application also provides a current transformer secondary circuit current differential protection device, comprising:

[0030] A data acquisition module, used to acquire first initial three-phase current data and second initial three-phase current data of a secondary circuit of a current transformer to be analyzed;

[0031] A data weighting module, used for performing weighted sum processing on the first initial three-phase current data and the second initial three-phase current data respectively, to obtain first zero-sequence current data and second zero-sequence current data of the secondary circuit of the current transformer;

[0032] a flag determination module, used to determine first target flag bit information and second target flag bit information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively;

[0033] a data compensation module, configured to determine first compensated three-phase current data corresponding to the first initial three-phase current data according to the first initial three-phase current data and the second zero-sequence current data, and to determine second compensated three-phase current data corresponding to the second initial three-phase current data according to the second initial three-phase current data and the first zero-sequence current data;

[0034] a data determination module, configured to determine first target three-phase current data corresponding to the first target flag information from the first initial three-phase current data and the first compensated three-phase current data, and to determine second target three-phase current data corresponding to the second target flag information from the second initial three-phase current data and the second compensated three-phase current data;

[0035] A circuit protection module is used to perform current differential protection processing on the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data.

[0036] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0037] Acquire first initial three-phase current data and second initial three-phase current data of a secondary circuit of a current transformer to be analyzed;

[0038] Performing weighted sum processing on the first initial three-phase current data and the second initial three-phase current data respectively to obtain first zero-sequence current data and second zero-sequence current data of the secondary circuit of the current transformer;

[0039] Determine first target flag bit information and second target flag bit information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively;

[0040] Determine, according to the first initial three-phase current data and the second zero-sequence current data, first compensated three-phase current data corresponding to the first initial three-phase current data, and determine, according to the second initial three-phase current data and the first zero-sequence current data, second compensated three-phase current data corresponding to the second initial three-phase current data;

[0041] Determine the first target three-phase current data corresponding to the first target flag information from the first initial three-phase current data and the first compensated three-phase current data, and determine the second target three-phase current data corresponding to the second target flag information from the second initial three-phase current data and the second compensated three-phase current data;

[0042] According to the first target three-phase current data and the second target three-phase current data, current differential protection processing is performed on the secondary circuit of the current transformer.

[0043] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0044] Acquire first initial three-phase current data and second initial three-phase current data of a secondary circuit of a current transformer to be analyzed;

[0045] Performing weighted sum processing on the first initial three-phase current data and the second initial three-phase current data respectively to obtain first zero-sequence current data and second zero-sequence current data of the secondary circuit of the current transformer;

[0046] Determine first target flag bit information and second target flag bit information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively;

[0047] Determine, according to the first initial three-phase current data and the second zero-sequence current data, first compensated three-phase current data corresponding to the first initial three-phase current data, and determine, according to the second initial three-phase current data and the first zero-sequence current data, second compensated three-phase current data corresponding to the second initial three-phase current data;

[0048] Determine the first target three-phase current data corresponding to the first target flag information from the first initial three-phase current data and the first compensated three-phase current data, and determine the second target three-phase current data corresponding to the second target flag information from the second initial three-phase current data and the second compensated three-phase current data;

[0049] According to the first target three-phase current data and the second target three-phase current data, current differential protection processing is performed on the secondary circuit of the current transformer.

[0050] In a fifth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0051] Acquire first initial three-phase current data and second initial three-phase current data of a secondary circuit of a current transformer to be analyzed;

[0052] Performing weighted sum processing on the first initial three-phase current data and the second initial three-phase current data respectively to obtain first zero-sequence current data and second zero-sequence current data of the secondary circuit of the current transformer;

[0053] Determine first target flag bit information and second target flag bit information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively;

[0054] Determine, according to the first initial three-phase current data and the second zero-sequence current data, first compensated three-phase current data corresponding to the first initial three-phase current data, and determine, according to the second initial three-phase current data and the first zero-sequence current data, second compensated three-phase current data corresponding to the second initial three-phase current data;

[0055] Determine the first target three-phase current data corresponding to the first target flag information from the first initial three-phase current data and the first compensated three-phase current data, and determine the second target three-phase current data corresponding to the second target flag information from the second initial three-phase current data and the second compensated three-phase current data;

[0056] According to the first target three-phase current data and the second target three-phase current data, current differential protection processing is performed on the secondary circuit of the current transformer.

[0057] The current transformer secondary circuit current differential protection method, device, computer equipment, storage medium and computer program product first obtain the first initial three-phase current data and the second initial three-phase current data of the current transformer secondary circuit to be analyzed, and respectively perform weighted summation processing on the first initial three-phase current data and the second initial three-phase current data to obtain the first zero-sequence current data and the second zero-sequence current data of the current transformer secondary circuit, and then determine the first target flag information and the second target flag information corresponding to the current transformer secondary circuit according to the first zero-sequence current data and the second zero-sequence current data, respectively, and then determine the first target flag information and the second target flag information corresponding to the current transformer secondary circuit according to the first initial three-phase current data and the second zero-sequence current data. The first compensated three-phase current data corresponding to the first initial three-phase current data, and the second compensated three-phase current data corresponding to the second initial three-phase current data are determined based on the second initial three-phase current data and the first zero-sequence current data. Then, the first target three-phase current data corresponding to the first target flag information is determined from the first initial three-phase current data and the first compensated three-phase current data, and the second target three-phase current data corresponding to the second target flag information is determined from the second initial three-phase current data and the second compensated three-phase current data. Finally, according to the first target three-phase current data and the second target three-phase current data, current differential protection processing is performed on the secondary circuit of the current transformer. In this way, in the process of protecting the secondary circuit of the current transformer, the corresponding first zero-sequence current data and the second zero-sequence current data can be accurately obtained by performing weighted summation processing on the first initial three-phase current data and the second initial three-phase current data, so that the corresponding first target flag information and the second target flag information can be accurately determined, and then the corresponding first target three-phase current data and the second target three-phase current data can be accurately determined, and the current transformer secondary circuit is subjected to current differential protection processing based on the above data, which is beneficial to improving the processing accuracy of the current differential protection processing of the secondary circuit of the current transformer, and thus improving the stability of the operation of the secondary circuit of the current transformer; moreover, the entire process does not require manual intervention, avoiding the defect that the manual protection method is prone to protection misoperation, resulting in low stability of the operation of the secondary circuit of the current transformer, and further improving the stability of the operation of the secondary circuit of the current transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 11 is a schematic flow chart of a current transformer secondary circuit current differential protection method in one embodiment;

[0060] Figure 2 It is a schematic flow chart of a current transformer secondary circuit current differential protection method in another embodiment;

[0061] Figure 3 It is a flow chart of a method for preventing false operation of current differential protection and locating and giving an alarm for line break when the neutral line of a CT secondary circuit is broken in one embodiment;

[0062] Figure 4 A schematic diagram of an embodiment in which a terminal block is not correctly connected;

[0063] Figure 5 It is a structural block diagram of a current transformer secondary circuit current differential protection device in one embodiment;

[0064] Figure 6 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0066] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0067] In an exemplary embodiment, Figure 1 As shown, a current transformer secondary circuit current differential protection method is provided. This embodiment uses the method applied to a server as an example for illustration; it can be understood that the method can also be applied to a terminal, and can also be applied to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. Among them, the terminal can be but is not limited to various personal computers, laptops, smart phones and tablets; the server can be implemented with an independent server or a server cluster composed of multiple servers. In this embodiment, the method includes the following steps:

[0068] Step S101, obtaining first initial three-phase current data and second initial three-phase current data of a secondary circuit of a current transformer to be analyzed.

[0069] Among them, the secondary circuit of the current transformer is also called the CT (Current Transformer) secondary circuit. It should be noted that the secondary circuit of the current transformer includes side 1 (primary side) and side 2 (secondary side). Among them, side 1 of the secondary circuit of the current transformer is the part connected to the primary main circuit, and side 2 is mainly connected to various measuring instruments and relay protection devices.

[0070] The first initial three-phase current data refers to the original three-phase current data of side 1 of the secondary circuit of the current transformer. In actual scenarios, the first initial three-phase current data includes sub-initial three-phase current data , , .

[0071] The second initial three-phase current data refers to the original three-phase current data on the two sides of the secondary circuit of the current transformer. In the actual scenario, the second initial three-phase current data includes the sub-initial three-phase current data , , .

[0072] Exemplarily, the server obtains the associated device information corresponding to each candidate current transformer secondary circuit; then, the server screens out the candidate current transformer secondary circuits whose corresponding associated device information satisfies the preset device information (for example, the associated device information includes core devices such as the main transformer and busbar), as the current transformer secondary circuit to be analyzed; then, the server collects the first initial three-phase current data and the second initial three-phase current data of the current transformer secondary circuit to be analyzed through a current sensor (such as an ammeter, a Hall effect current sensor, etc.) connected to the current transformer secondary circuit to be analyzed.

[0073] Step S102 , performing weighted sum processing on the first initial three-phase current data and the second initial three-phase current data respectively to obtain first zero-sequence current data and second zero-sequence current data of the secondary circuit of the current transformer.

[0074] The first zero-sequence current data refers to the zero-sequence current data on side 1 of the secondary circuit of the current transformer.

[0075] The second zero-sequence current data refers to the zero-sequence current data on two sides of the secondary circuit of the current transformer.

[0076] Exemplarily, the server obtains the weight of each sub-initial three-phase current data in the first initial three-phase current data, and performs weighted summation processing on the first initial three-phase current data according to the weight of each sub-initial three-phase current data in the first initial three-phase current data, so as to obtain the first zero-sequence current data of the secondary circuit of the current transformer; then, the server obtains the weight of each sub-initial three-phase current data in the second initial three-phase current data, and performs weighted summation processing on the second initial three-phase current data according to the weight of each sub-initial three-phase current data in the second initial three-phase current data, so as to obtain the second zero-sequence current data of the secondary circuit of the current transformer.

[0077] For example, the server can obtain the first zero-sequence current data and the second zero-sequence current data of the secondary circuit of the current transformer through the following formula:

[0078] , formula (1)

[0079] Step S103: determining first target flag information and second target flag information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively.

[0080] The first target flag information refers to the target flag information of side 1 of the secondary circuit of the current transformer. .

[0081] The second target flag information refers to the target flag information on the second side of the current transformer secondary circuit. .

[0082] It should be noted that and Used to reflect whether there is a neutral wire break on both sides of the current transformer secondary circuit.

[0083] Exemplarily, the server determines first target flag information corresponding to the secondary circuit of the current transformer based on the first zero-sequence current data; then, the server determines second target flag information corresponding to the secondary circuit of the current transformer based on the second zero-sequence current data.

[0084] Step S104, determining the first compensated three-phase current data corresponding to the first initial three-phase current data based on the first initial three-phase current data and the second zero-sequence current data, and determining the second compensated three-phase current data corresponding to the second initial three-phase current data based on the second initial three-phase current data and the first zero-sequence current data.

[0085] The first compensated three-phase current data refers to the compensated three-phase current data on the 1 side of the secondary circuit of the current transformer. In actual scenarios, the first compensated three-phase current data includes the sub-compensated three-phase current data. , , .

[0086] The second compensated three-phase current data refers to the compensated three-phase current data on both sides of the secondary circuit of the current transformer. In actual scenarios, the second compensated three-phase current data includes the sub-compensated three-phase current data. , , .

[0087] Exemplarily, the server compensates the first initial three-phase current data based on the second zero-sequence current data to obtain first compensated three-phase current data corresponding to the first initial three-phase current data; then, the server compensates the second initial three-phase current data based on the first zero-sequence current data to obtain second compensated three-phase current data corresponding to the second initial three-phase current data.

[0088] For example, the server can determine the three-phase current data after the first compensation by the following formula:

[0089] , formula (2)

[0090] For example, the server can determine the three-phase current data after the second compensation by the following formula:

[0091] , formula (3)

[0092] Step S105, determine the first target three-phase current data corresponding to the first target flag information from the first initial three-phase current data and the first compensated three-phase current data, and determine the second target three-phase current data corresponding to the second target flag information from the second initial three-phase current data and the second compensated three-phase current data.

[0093] Among them, the first target three-phase current data refers to the target three-phase current data corresponding to the first target flag information, which may refer to the first initial three-phase current data or the first compensated three-phase current data.

[0094] Among them, the second target three-phase current data refers to the target three-phase current data corresponding to the second target flag information, which may refer to the second initial three-phase current data or the second compensated three-phase current data.

[0095] Exemplarily, the server judges the first target flag information to obtain a first judgment result; then, the server determines the first target three-phase current data corresponding to the first judgment result from the first initial three-phase current data and the first compensated three-phase current data; then, the server judges the second target flag information to obtain a second judgment result; then, the server determines the second target three-phase current data corresponding to the second judgment result from the second initial three-phase current data and the second compensated three-phase current data.

[0096] For example, take side 1 as an example, if , then side 1 will be the first compensation three-phase current data , , As the first target three-phase current data; otherwise, , then side 1 will first initial three-phase current data , , As the first target three-phase current data.

[0097] Step S106: performing current differential protection processing on the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data.

[0098] Among them, the current differential protection processing refers to the process of performing differential protection on the current in the secondary circuit of the current transformer.

[0099] Exemplarily, the server inputs the first target three-phase current data and the second target three-phase current data into the trained current differential protection instruction prediction model to obtain multiple preset current differential protection instructions for the secondary circuit of the current transformer, and the prediction probability of each preset current differential protection instruction; then, the server selects the preset current differential protection instruction with the largest prediction probability from each preset current differential protection instruction as the target current differential protection instruction; then, the server performs current differential protection processing on the secondary circuit of the current transformer according to the target current differential protection instruction.

[0100] In the current transformer secondary circuit current differential protection method, the first initial three-phase current data and the second initial three-phase current data of the current transformer secondary circuit to be analyzed are first obtained, and the first initial three-phase current data and the second initial three-phase current data are respectively weighted summed to obtain the first zero-sequence current data and the second zero-sequence current data of the current transformer secondary circuit, and then the first target flag information and the second target flag information corresponding to the current transformer secondary circuit are determined according to the first zero-sequence current data and the second zero-sequence current data, respectively. Then, according to the first initial three-phase current data and the second zero-sequence current data, the first initial three-phase current data is determined to be The first compensated three-phase current data corresponding to the second initial three-phase current data is determined according to the second initial three-phase current data and the first zero-sequence current data, and then, the first target three-phase current data corresponding to the first target flag information is determined from the first initial three-phase current data and the first compensated three-phase current data, and the second target three-phase current data corresponding to the second target flag information is determined from the second initial three-phase current data and the second compensated three-phase current data; finally, according to the first target three-phase current data and the second target three-phase current data, current differential protection processing is performed on the secondary circuit of the current transformer. In this way, in the process of protecting the secondary circuit of the current transformer, the corresponding first zero-sequence current data and the second zero-sequence current data can be accurately obtained by performing weighted summation processing on the first initial three-phase current data and the second initial three-phase current data, so that the corresponding first target flag information and the second target flag information can be accurately determined, and then the corresponding first target three-phase current data and the second target three-phase current data can be accurately determined, and the current transformer secondary circuit is subjected to current differential protection processing based on the above data, which is beneficial to improving the processing accuracy of the current differential protection processing of the secondary circuit of the current transformer, and thus improving the stability of the operation of the secondary circuit of the current transformer; moreover, the entire process does not require manual intervention, avoiding the defect that the manual protection method is prone to protection misoperation, resulting in low stability of the operation of the secondary circuit of the current transformer, and further improving the stability of the operation of the secondary circuit of the current transformer.

[0101] In an exemplary embodiment, the above-mentioned step S103, respectively, determines the first target flag information and the second target flag information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data, and specifically includes the following contents: respectively, determines the first initial flag information and the second initial flag information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data; respectively updates the first initial flag information and the second initial flag information to obtain the first target flag information and the second target flag information corresponding to the secondary circuit of the current transformer.

[0102] The first initial flag information refers to the initial flag information of side 1 of the secondary circuit of the current transformer. .

[0103] The second initial flag information refers to the initial flag information of the two sides of the secondary circuit of the current transformer. .

[0104] It should be noted that and It is used to reflect whether the zero-sequence current components indicating the existence of a fault are collected on both sides of the secondary circuit of the current transformer.

[0105] Exemplarily, the server determines the first initial flag information corresponding to the secondary circuit of the current transformer based on the first zero-sequence current data, and determines the second initial flag information corresponding to the secondary circuit of the current transformer based on the second zero-sequence current data; then, the server updates the first initial flag information to obtain the updated first initial flag information as the first target flag information corresponding to the secondary circuit of the current transformer, and updates the second initial flag information to obtain the updated second initial flag information as the second target flag information corresponding to the secondary circuit of the current transformer.

[0106] In this embodiment, by using the zero-sequence current data corresponding to both sides of the current transformer secondary circuit, the initial flag information corresponding to both sides of the current transformer secondary circuit can be accurately determined, and then the target flag information corresponding to both sides of the current transformer secondary circuit can be more accurately determined, thereby providing an accurate data basis for subsequent data analysis.

[0107] In an exemplary embodiment, first initial flag information and second initial flag information corresponding to the secondary circuit of the current transformer are determined based on first zero-sequence current data and second zero-sequence current data, respectively, specifically including the following contents: determining a first zero-sequence current effective value corresponding to the first zero-sequence current data and a second zero-sequence current effective value corresponding to the second zero-sequence current data, and obtaining a zero-sequence current threshold value corresponding to the secondary circuit of the current transformer; determining the first initial flag information based on the difference between the first zero-sequence current effective value and the zero-sequence current threshold value, and determining the second initial flag information based on the difference between the second zero-sequence current effective value and the zero-sequence current threshold value.

[0108] The first zero-sequence current effective value refers to the effective value corresponding to the first zero-sequence current data.

[0109] The second zero-sequence current effective value refers to the effective value corresponding to the second zero-sequence current data.

[0110] The zero-sequence current threshold value refers to a preset zero-sequence current threshold value, which is used to judge the first zero-sequence current data and the second zero-sequence current data. It should be noted that the zero-sequence current threshold value depends on the situation.

[0111] Exemplarily, the server inputs the first zero-sequence current data into the effective value prediction model to obtain the effective value corresponding to the first zero-sequence current data as the first zero-sequence current effective value, and inputs the second zero-sequence current data into the effective value prediction model to obtain the effective value corresponding to the second zero-sequence current data as the second zero-sequence current effective value; then, the server obtains the zero-sequence current threshold value corresponding to the secondary circuit of the current transformer from the database; then, the server determines the first initial flag information according to the difference between the first zero-sequence current effective value and the zero-sequence current threshold value, and determines the second initial flag information according to the difference between the second zero-sequence current effective value and the zero-sequence current threshold value; for example, when the first zero-sequence current effective value is greater than or equal to the zero-sequence current threshold value, the first initial flag information is determined to be 1; when the first zero-sequence current effective value is less than the zero-sequence current threshold value, the first initial flag information is determined to be 0; when the second zero-sequence current effective value is greater than or equal to the zero-sequence current threshold value, the second initial flag information is determined to be 1; when the second zero-sequence current effective value is less than the zero-sequence current threshold value, the second initial flag information is determined to be 0.

[0112] In this embodiment, by determining the effective values ​​corresponding to the first zero-sequence current data and the second zero-sequence current data, the actual size of the zero-sequence current can be evaluated more accurately, thereby making the subsequent judgment of the difference with the zero-sequence current threshold value more accurate, which is beneficial to improving the determination accuracy of the first initial flag information and the second initial flag information.

[0113] In an exemplary embodiment, the first initial flag bit information and the second initial flag bit information are updated respectively to obtain the first target flag bit information and the second target flag bit information corresponding to the secondary circuit of the current transformer, which specifically includes the following contents: performing an XOR operation on the first initial flag bit information and the second initial flag bit information to obtain an XOR operation result; performing an AND operation on the second initial flag bit information and the XOR operation result to obtain the first target flag bit information, and performing an AND operation on the first initial flag bit information and the XOR operation result to obtain the second target flag bit information.

[0114] The XOR operation processing result refers to the processing result obtained by performing an XOR operation on the first initial flag information and the second initial flag information. .

[0115] Exemplarily, the server performs an XOR operation on the first initial flag bit information and the second initial flag bit information to obtain an XOR operation result; then, the server verifies the XOR operation result (for example, determines whether the numerical value corresponding to the XOR operation result is 1 or 0) to obtain a verification result; when the verification result meets the preset verification result (for example, the numerical value corresponding to the XOR operation result is 1 or 0), the server performs an AND operation on the second initial flag bit information and the XOR operation result to obtain the first target flag bit information, and performs an AND operation on the first initial flag bit information and the XOR operation result to obtain the second target flag bit information.

[0116] For example, the server can obtain the XOR operation result through the following formula:

[0117] , formula (4)

[0118] For example, the server may obtain the first target flag information and the second target flag information through the following formula:

[0119] , formula (5)

[0120] In this embodiment, the target flag information is obtained by performing double operation on the two initial flag information, so that the target flag information is not only determined by relying on a single initial flag information or a simple comparison, but is determined by considering the two initial flag information comprehensively, which is beneficial to improving the determination accuracy of the first target flag information and the second target flag information.

[0121] In an exemplary embodiment, after determining the first target flag information and the second target flag information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data, respectively, it specifically includes the following contents: when the first target flag information is the preset flag information, and / or when the second target flag information is the preset flag information, determining the disconnection position information corresponding to the secondary circuit of the current transformer; generating alarm information corresponding to the secondary circuit of the current transformer according to the disconnection position information; and sending the alarm information to the target terminal associated with the secondary circuit of the current transformer.

[0122] The preset flag information refers to pre-set flag information, which is used to judge the first target flag information and the second target flag information. In an actual scenario, the preset flag information is 1. It should be noted that the preset flag information depends on the situation.

[0123] The wire break location information is used to indicate the specific location where the wire break occurs in the secondary circuit of the current transformer, which may be side 1 or side 2.

[0124] The alarm information is used to indicate an alarm signal corresponding to a disconnection in the secondary circuit of the current transformer.

[0125] The target terminal refers to the terminal associated with the secondary circuit of the current transformer.

[0126] Exemplarily, the server judges the first target flag information and the second target flag information according to the preset flag information to obtain a judgment result; when the judgment result indicates that the first target flag information is the preset flag information, and / or when the judgment result indicates that the second target flag information is the preset flag information, the server determines the disconnection position information corresponding to the secondary circuit of the current transformer; for example, when the first target flag information is 1 and the second target flag information is 0, the server determines that the disconnection position information corresponding to the secondary circuit of the current transformer is 1; when the first target flag information is 0 and the second target flag information is 1, the server determines that the current transformer The line break position information corresponding to the secondary circuit is side 2; when the first target flag information is 1 and the second target flag information is 1, the server determines that the line break position information corresponding to the secondary circuit of the current transformer is side 1 and side 2; then, the server obtains the identification information of the secondary circuit of the current transformer, and generates alarm information corresponding to the identification information and the line break position information according to the identification information and the line break position information, as the alarm information corresponding to the secondary circuit of the current transformer; then, the server determines the terminal associated with the secondary circuit of the current transformer as the target terminal; finally, the server establishes a direct network path with the target terminal, and sends the alarm information to the target terminal through the network path.

[0127] In this embodiment, by comparing the target flag information with the preset flag information, the line break position information corresponding to the secondary circuit of the current transformer can be determined, which greatly saves the troubleshooting time; moreover, after determining the line break position information, the corresponding alarm information can be quickly generated and sent to the target terminal, avoiding the further expansion of the operation risk of the power system due to the failure to discover the fault in time.

[0128] In an exemplary embodiment, current differential protection processing is performed on the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data, specifically including the following contents: determining the differential current and braking current corresponding to the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data; obtaining the starting current and braking coefficient corresponding to the secondary circuit of the current transformer; and performing current differential protection processing on the secondary circuit of the current transformer when the differential current, braking current, starting current and braking coefficient all meet preset conditions.

[0129] The differential current refers to the current value used to detect whether there is a fault or short circuit inside the device.

[0130] The braking current refers to the reference current used to prevent the current differential protection from malfunctioning in the event of an external fault.

[0131] Among them, the starting current refers to the current value corresponding to the secondary circuit of the current transformer at the moment of power-on.

[0132] The braking coefficient refers to the coefficient value that satisfies the braking characteristics of the current differential protection of the secondary circuit of the current transformer.

[0133] The preset condition refers to a pre-set judgment condition used to judge the differential current, braking current, starting current and braking coefficient, as shown in the following formula:

[0134] , formula (6)

[0135] in, The differential current, Refers to the braking current, K r Refers to the braking coefficient, I qd Refers to the starting current.

[0136] It should be noted that the pre-conditions depend on the circumstances.

[0137] Exemplarily, the server determines the differential current and braking current corresponding to the first target three-phase current data and the second target three-phase current data based on the first target three-phase current data and the second target three-phase current data, as the differential current and braking current corresponding to the secondary circuit of the current transformer; then, the server obtains the starting current and braking coefficient corresponding to the secondary circuit of the current transformer from the database; then, the server judges the differential current, braking current, starting current and braking coefficient according to preset conditions to obtain a judgment result; when the judgment result indicates that the differential current, braking current, starting current and braking coefficient all meet the preset conditions, the server inputs the first target three-phase current data and the second target three-phase current data into the trained current differential protection instruction prediction model to obtain multiple preset current differential protection instructions for the secondary circuit of the current transformer, and the prediction probability of each preset current differential protection instruction; then, the server selects the preset current differential protection instruction with the largest prediction probability from each preset current differential protection instruction as the target current differential protection instruction; then, the server performs current differential protection processing on the secondary circuit of the current transformer according to the target current differential protection instruction.

[0138] For example, the differential current and the braking current can be determined by the first initial three-phase current data and the second initial three-phase current data, as shown in the following formula:

[0139] , formula (7)

[0140] For example, the differential current and the braking current can also be determined by the first compensated three-phase current data and the second compensated three-phase current data, as shown in the following formula:

[0141] , formula (8)

[0142] In this embodiment, by comprehensively considering the differential current, braking current, starting current and braking coefficient, and performing current differential protection processing when all preset conditions are met, the probability of false protection operation can be reduced, thereby ensuring the normal operation of the secondary circuit of the current transformer, which is beneficial to improving the stability of the operation of the secondary circuit of the current transformer.

[0143] In an exemplary embodiment, Figure 2 As shown, another current transformer secondary circuit current differential protection method is provided, and the method is applied to a server as an example for explanation, including the following steps:

[0144] Step S201, obtaining first initial three-phase current data and second initial three-phase current data of a secondary circuit of a current transformer to be analyzed.

[0145] Step S202 , performing weighted sum processing on the first initial three-phase current data and the second initial three-phase current data respectively to obtain first zero-sequence current data and second zero-sequence current data of the secondary circuit of the current transformer.

[0146] Step S203, determining a first zero-sequence current effective value corresponding to the first zero-sequence current data and a second zero-sequence current effective value corresponding to the second zero-sequence current data, and obtaining a zero-sequence current threshold value corresponding to the secondary circuit of the current transformer.

[0147] Step S204, determining the first initial flag information according to the difference between the first zero-sequence current effective value and the zero-sequence current threshold value, and determining the second initial flag information according to the difference between the second zero-sequence current effective value and the zero-sequence current threshold value.

[0148] Step S205, performing an XOR operation on the first initial flag information and the second initial flag information to obtain an XOR operation result.

[0149] Step S206, performing an AND operation on the second initial flag information and the XOR operation result to obtain the first target flag information, and performing an AND operation on the first initial flag information and the XOR operation result to obtain the second target flag information.

[0150] Step S207, determining the first compensated three-phase current data corresponding to the first initial three-phase current data based on the first initial three-phase current data and the second zero-sequence current data, and determining the second compensated three-phase current data corresponding to the second initial three-phase current data based on the second initial three-phase current data and the first zero-sequence current data.

[0151] Step S208, determine the first target three-phase current data corresponding to the first target flag information from the first initial three-phase current data and the first compensated three-phase current data, and determine the second target three-phase current data corresponding to the second target flag information from the second initial three-phase current data and the second compensated three-phase current data.

[0152] Step S209: determining the differential current and the braking current corresponding to the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data.

[0153] Step S210, obtaining the starting current and braking coefficient corresponding to the secondary circuit of the current transformer.

[0154] Step S211, when the differential current, the braking current, the starting current and the braking coefficient all meet the preset conditions, the current differential protection processing is performed on the secondary circuit of the current transformer.

[0155] In the above-mentioned current transformer secondary circuit current differential protection method, in the process of protecting the current transformer secondary circuit, the corresponding first zero-sequence current data and the second zero-sequence current data can be accurately obtained by performing weighted summation processing on the first initial three-phase current data and the second initial three-phase current data, so that the corresponding first target flag information and the second target flag information can be accurately determined, and then the corresponding first target three-phase current data and the second target three-phase current data can be accurately determined, and the current transformer secondary circuit is subjected to current differential protection processing based on the above-mentioned data, which is beneficial to improving the processing accuracy of the current differential protection processing of the current transformer secondary circuit, thereby improving the stability of the operation of the current transformer secondary circuit; moreover, the whole process does not require manual intervention, avoiding the defect that the manual protection method is prone to protection misoperation, resulting in low stability of the operation of the current transformer secondary circuit, and further improving the stability of the operation of the current transformer secondary circuit.

[0156] In an exemplary embodiment, in order to more clearly illustrate the current transformer secondary circuit current differential protection method provided in the embodiment of the present application, the current transformer secondary circuit current differential protection method is specifically described below with a specific embodiment. In one embodiment, Figure 3 As shown, the present application also provides a method for preventing false operation of current differential protection and locating and giving an alarm for line break when the neutral line of the CT secondary circuit is broken. In the process of protecting the secondary circuit of the current transformer, the self-generated zero-sequence current on both sides is first calculated based on the CT collected current, and then it is determined whether the zero-sequence current is generated due to a fault. Then, an XOR operation is performed based on the zero-sequence current on both sides to determine whether there is a line break and locate the line break side. Then, the CT collected currents on both sides are compensated with the zero-sequence current on the opposite side to obtain the compensated three-phase current. Finally, the original or compensated three-phase current is selected on both sides according to the line break flag to execute the differential protection logic. Specifically, it includes the following contents:

[0157] At present, there have been many cases in the power grid system where the neutral line of the CT secondary circuit is broken, causing current circuit anomalies, resulting in incorrect operation of the current differential protection. The reasons for the break include the failure of the terminal connector to be restored after maintenance or the aging of the line, poor contact, etc. Figure 4 As shown, the terminal block was not correctly connected at the broken wire, resulting in malfunction of the differential protection when a fault occurred.

[0158] The specific steps of this embodiment are as follows:

[0159] Step 1, taking the line phase current differential protection as an example, the zero-sequence current components on both sides are obtained by summing the collected three-phase currents. The subscripts 1 and 2 represent the two sides, respectively, referred to as side 1 and side 2. The zero-sequence current components on both sides are:

[0160] , formula (1)

[0161] Step 2: The effective value of zero-sequence current on both sides , , and the zero-sequence current threshold Compare, if satisfied Then the flag bit of this side is set ,otherwise This flag bit It reflects whether the CT on this side collects the zero-sequence current component indicating the presence of a fault.

[0162] Similarly, if Then the flag bit of this side is set ,otherwise This flag bit It reflects whether the CT on the other side collects the zero-sequence current component indicating the presence of a fault.

[0163] Step 3: Perform a logical "XOR" operation on the two flag bits. The XOR operation mathematical symbol is represented by "⊕", that is:

[0164] , formula (4)

[0165] If , If the two are the same, then is 0, otherwise if , The two are different. is 1.

[0166] This flag Used to reflect whether there is an abnormality in the neutral line of the secondary circuit.

[0167] Then will , Respectively Performing a logical "AND" operation, we get:

[0168] , formula (5)

[0169] The two flags obtained , Respectively reflect whether there is a neutral wire break on both sides.

[0170] The above formula shows that when When 1 indicates that there is a neutral line break in the CT secondary circuit, the logic "AND" operation is used to determine which side the neutral line break occurs on, based on whether the zero-sequence current component is detected on both sides. For example, if the zero-sequence current component is not detected on side 1, but the zero-sequence component is detected on side 2, then , , so we can get , , that is, to identify the line break occurred on side 1, according to the two flags , Send an alarm signal.

[0171] Step 4: The three-phase currents collected by the CTs on both sides are compensated by the zero-sequence current components collected by the opposite side.

[0172] For side 1 we have:

[0173] , formula (2)

[0174] And for side 2 we have:

[0175] , formula (3)

[0176] Step 5: According to the flag bit , Determine the three-phase current signals used to execute the current differential protection judgment logic.

[0177] Taking side 1 as an example, if , then this side uses the compensated three-phase current , , Used to execute the current differential protection judgment logic; otherwise, , then this side uses the original three-phase current , , Used to execute current differential protection judgment logic.

[0178] Among them, the action criteria of current differential protection are as follows:

[0179] , formula (6)

[0180] , They represent the differential current and braking current of each phase respectively.

[0181] K r is the braking coefficient, I qd is the starting current.

[0182] The two relational expressions are "AND" logic, that is, the protection action is performed if the above criteria are met.

[0183] like , then this side uses the compensated three-phase current , , Used to execute the current differential protection judgment logic, namely:

[0184] , formula (7)

[0185] On the contrary , then this side uses the original three-phase current , , Used to execute the current differential protection judgment logic, namely:

[0186] , formula (8)

[0187] In the above embodiment, during the process of protecting the secondary circuit of the current transformer, the corresponding first zero-sequence current data and the second zero-sequence current data can be accurately obtained by performing weighted summation processing on the first initial three-phase current data and the second initial three-phase current data, so that the corresponding first target flag information and the second target flag information can be accurately determined, and then the corresponding first target three-phase current data and the second target three-phase current data can be accurately determined, and the current transformer secondary circuit is subjected to current differential protection processing based on the above data, which is beneficial to improving the processing accuracy of the current differential protection processing of the secondary circuit of the current transformer, and then improving the stability of the operation of the secondary circuit of the current transformer; moreover, the whole process does not require manual intervention, avoiding the defect that the manual protection method is prone to protection malfunction, resulting in low stability of the operation of the secondary circuit of the current transformer, and further improving the stability of the operation of the secondary circuit of the current transformer. At the same time, only the comparison and compensation of the self-generated zero-sequence current of the protection device (only the three-phase current signals need to be summed, which is easy to calculate and obtain) can be used to prevent false operation and identify line breaks, without adding other sequence component filtering algorithms, other information transmission, or external additional equipment. Moreover, while judging that the neutral line of the CT secondary circuit is abnormal, the side where the line break occurs is directly determined, and an alarm is issued, which can guide the operation and maintenance personnel to quickly locate the position of the line break in the CT secondary circuit.

[0188] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0189] Based on the same inventive concept, the embodiment of the present application also provides a current transformer secondary circuit current differential protection device for implementing the current transformer secondary circuit current differential protection method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more current transformer secondary circuit current differential protection device embodiments provided below can refer to the limitations of the current transformer secondary circuit current differential protection method above, and will not be repeated here.

[0190] In an exemplary embodiment, Figure 5 As shown, a current transformer secondary circuit current differential protection device is provided, comprising: a data acquisition module 501, a data weighting module 502, a flag determination module 503, a data compensation module 504, a data determination module 505 and a circuit protection module 506, wherein:

[0191] The data acquisition module 501 is used to acquire first initial three-phase current data and second initial three-phase current data of the secondary circuit of the current transformer to be analyzed.

[0192] The data weighting module 502 is used to perform weighted sum processing on the first initial three-phase current data and the second initial three-phase current data respectively to obtain the first zero-sequence current data and the second zero-sequence current data of the secondary circuit of the current transformer.

[0193] The flag determination module 503 is used to determine the first target flag bit information and the second target flag bit information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively.

[0194] The data compensation module 504 is used to determine the first compensated three-phase current data corresponding to the first initial three-phase current data based on the first initial three-phase current data and the second zero-sequence current data, and to determine the second compensated three-phase current data corresponding to the second initial three-phase current data based on the second initial three-phase current data and the first zero-sequence current data.

[0195] The data determination module 505 is used to determine the first target three-phase current data corresponding to the first target flag information from the first initial three-phase current data and the first compensated three-phase current data, and to determine the second target three-phase current data corresponding to the second target flag information from the second initial three-phase current data and the second compensated three-phase current data.

[0196] The circuit protection module 506 is used to perform current differential protection processing on the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data.

[0197] In an exemplary embodiment, the flag determination module 503 is also used to determine the first initial flag information and the second initial flag information corresponding to the secondary circuit of the current transformer based on the first zero-sequence current data and the second zero-sequence current data, respectively; and update the first initial flag information and the second initial flag information, respectively, to obtain the first target flag information and the second target flag information corresponding to the secondary circuit of the current transformer.

[0198] In an exemplary embodiment, the flag determination module 503 is also used to determine the first zero-sequence current effective value corresponding to the first zero-sequence current data, and the second zero-sequence current effective value corresponding to the second zero-sequence current data, and obtain the zero-sequence current threshold value corresponding to the secondary circuit of the current transformer; determine the first initial flag information based on the difference between the first zero-sequence current effective value and the zero-sequence current threshold value, and determine the second initial flag information based on the difference between the second zero-sequence current effective value and the zero-sequence current threshold value.

[0199] In an exemplary embodiment, the flag determination module 503 is also used to perform an XOR operation on the first initial flag bit information and the second initial flag bit information to obtain an XOR operation result; perform an AND operation on the second initial flag bit information and the XOR operation result to obtain the first target flag bit information, and perform an AND operation on the first initial flag bit information and the XOR operation result to obtain the second target flag bit information.

[0200] In an exemplary embodiment, the current transformer secondary circuit current differential protection device also includes an information sending module, which is used to determine the disconnection position information corresponding to the current transformer secondary circuit when the first target flag information is the preset flag information, and / or when the second target flag information is the preset flag information; generate alarm information corresponding to the current transformer secondary circuit according to the disconnection position information; and send the alarm information to the target terminal associated with the current transformer secondary circuit.

[0201] In an exemplary embodiment, the circuit protection module 506 is also used to determine the differential current and braking current corresponding to the secondary circuit of the current transformer based on the first target three-phase current data and the second target three-phase current data; obtain the starting current and braking coefficient corresponding to the secondary circuit of the current transformer; and perform current differential protection processing on the secondary circuit of the current transformer when the differential current, braking current, starting current and braking coefficient all meet preset conditions.

[0202] Each module in the current transformer secondary circuit current differential protection device can be implemented in whole or in part by software, hardware and a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0203] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Figure 6 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store initial three-phase current data, zero-sequence current data, etc. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a current differential protection method for the secondary circuit of a current transformer is implemented.

[0204] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0205] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0206] In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0207] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0208] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium 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), magnetoresistive 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0209] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0210] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A current transformer secondary circuit current differential protection method, characterized in that: The method comprises: Acquire first initial three-phase current data and second initial three-phase current data of a secondary circuit of a current transformer to be analyzed; Performing weighted sum processing on the first initial three-phase current data and the second initial three-phase current data respectively to obtain first zero-sequence current data and second zero-sequence current data of the secondary circuit of the current transformer; Determine first target flag bit information and second target flag bit information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively; Determine, according to the first initial three-phase current data and the second zero-sequence current data, first compensated three-phase current data corresponding to the first initial three-phase current data, and determine, according to the second initial three-phase current data and the first zero-sequence current data, second compensated three-phase current data corresponding to the second initial three-phase current data; Determine the first target three-phase current data corresponding to the first target flag information from the first initial three-phase current data and the first compensated three-phase current data, and determine the second target three-phase current data corresponding to the second target flag information from the second initial three-phase current data and the second compensated three-phase current data; According to the first target three-phase current data and the second target three-phase current data, current differential protection processing is performed on the secondary circuit of the current transformer.

2. The method according to claim 1, characterized in that The determining, according to the first zero-sequence current data and the second zero-sequence current data, first target flag information and second target flag information corresponding to the secondary circuit of the current transformer respectively, comprises: Determine first initial flag information and second initial flag information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively; The first initial flag bit information and the second initial flag bit information are updated respectively to obtain the first target flag bit information and the second target flag bit information corresponding to the secondary circuit of the current transformer.

3. The method according to claim 2, characterized in that The determining, according to the first zero-sequence current data and the second zero-sequence current data, first initial flag information and second initial flag information corresponding to the secondary circuit of the current transformer comprises: Determine a first zero-sequence current effective value corresponding to the first zero-sequence current data, and a second zero-sequence current effective value corresponding to the second zero-sequence current data, and obtain a zero-sequence current threshold value corresponding to the secondary circuit of the current transformer; The first initial flag information is determined according to the difference between the first zero-sequence current effective value and the zero-sequence current threshold value, and the second initial flag information is determined according to the difference between the second zero-sequence current effective value and the zero-sequence current threshold value.

4. The method according to claim 2, characterized in that: The updating process of the first initial flag information and the second initial flag information respectively to obtain the first target flag information and the second target flag information corresponding to the secondary circuit of the current transformer includes: Performing an XOR operation on the first initial flag bit information and the second initial flag bit information to obtain an XOR operation result; The second initial flag information and the XOR operation result are processed by AND operation to obtain the first target flag information, and the first initial flag information and the XOR operation result are processed by AND operation to obtain the second target flag information.

5. The method according to claim 1, characterized in that After determining the first target flag information and the second target flag information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively, the method further includes: In a case where the first target flag information is preset flag information, and / or in a case where the second target flag information is the preset flag information, determining the disconnection position information corresponding to the secondary circuit of the current transformer; Generate alarm information corresponding to the secondary circuit of the current transformer according to the disconnection position information; The alarm information is sent to a target terminal associated with the secondary circuit of the current transformer.

6. The method according to any one of claims 1 to 5, characterized in that: The performing current differential protection processing on the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data comprises: Determining a differential current and a braking current corresponding to the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data; Obtaining the starting current and braking coefficient corresponding to the secondary circuit of the current transformer; When the differential current, the braking current, the starting current and the braking coefficient all meet preset conditions, current differential protection processing is performed on the secondary circuit of the current transformer.

7. A current transformer secondary circuit current differential protection device, characterized in that: The device comprises: A data acquisition module, used to acquire first initial three-phase current data and second initial three-phase current data of a secondary circuit of a current transformer to be analyzed; A data weighting module, used for performing weighted sum processing on the first initial three-phase current data and the second initial three-phase current data respectively, to obtain first zero-sequence current data and second zero-sequence current data of the secondary circuit of the current transformer; a flag determination module, used to determine first target flag bit information and second target flag bit information corresponding to the secondary circuit of the current transformer according to the first zero-sequence current data and the second zero-sequence current data respectively; a data compensation module, configured to determine first compensated three-phase current data corresponding to the first initial three-phase current data according to the first initial three-phase current data and the second zero-sequence current data, and to determine second compensated three-phase current data corresponding to the second initial three-phase current data according to the second initial three-phase current data and the first zero-sequence current data; a data determination module, configured to determine first target three-phase current data corresponding to the first target flag information from the first initial three-phase current data and the first compensated three-phase current data, and to determine second target three-phase current data corresponding to the second target flag information from the second initial three-phase current data and the second compensated three-phase current data; A circuit protection module is used to perform current differential protection processing on the secondary circuit of the current transformer according to the first target three-phase current data and the second target three-phase current data.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

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

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

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