A current transformer testing method and device, electronic equipment and storage medium

Abstract

The application provides a current transformer testing method and device, electronic equipment and storage medium. In the case that a target long-distance power transmission line is working, a current measurement value sequence corresponding to a current transformer sequence arranged in the target long-distance power transmission line is obtained, and whether the target long-distance power transmission line is abnormal is determined based on the current measurement value sequence. In the case that the target long-distance power transmission line is not abnormal, a current theoretical value sequence corresponding to the current transformer sequence is determined based on a current value of an associated parameter of the target long-distance power transmission line. The measurement error of each current transformer in the current transformer sequence is determined based on the current measurement value sequence and the current theoretical value sequence corresponding to the current transformer sequence. The current transformer can be automatically tested on site without power failure, the testing efficiency is improved, and the normal production and life of users are not affected.

Description

Technical Field

[0001] This invention relates to the field of power equipment testing technology, and in particular to a current transformer testing method and system. Background Technology

[0002] With the continuous growth of electricity demand, long-distance transmission lines play a crucial role in modern power systems. Transmission lines connect power plants and distribution stations, ensuring efficient power transmission. To guarantee the safe transmission of electricity over long distances, current transformers are typically installed to measure current signals for use in the control and protection of the subsequent power system. Therefore, the measurement accuracy of current transformers directly affects the reliability and security of the power system. While current transformers installed in transmission lines generally maintain measurement accuracy in the initial stages of operation, their performance gradually deteriorates over time due to durability and external environmental factors. Therefore, current technology involves periodically conducting accuracy tests on current transformers installed in transmission lines for timely maintenance.

[0003] Existing current transformer accuracy testing requires on-site testing during power outages or removal and testing in a laboratory, which is not only inefficient but also disrupts users' normal production and daily life. Summary of the Invention

[0004] This invention provides a current transformer testing method, apparatus, electronic device, and storage medium to address the shortcomings of existing current transformer testing technologies, such as low testing efficiency and disruption to users' normal production and daily life.

[0005] This invention provides a current transformer testing method, applied to the accuracy testing of current transformer sequences installed in long-distance transmission lines, comprising:

[0006] When the target long-distance transmission line is in operation, the current current measurement value sequence corresponding to the current transformer sequence set in the target long-distance transmission line is obtained, and the abnormality of the target long-distance transmission line is determined based on the current current measurement value sequence.

[0007] If there are no abnormalities in the target long-distance transmission line, the current theoretical current value sequence corresponding to the current transformer sequence is determined based on the current values ​​of the associated parameters of the target long-distance transmission line; the associated parameters include input current, output current, line attribute parameters and environmental parameters;

[0008] Based on the current current measurement value sequence and the current theoretical current value sequence corresponding to the current transformer sequence, the measurement error of each current transformer in the current transformer sequence is determined.

[0009] According to a current transformer testing method provided by the present invention, the step of determining whether there is an anomaly in the target long-distance transmission line based on the current current measurement value sequence specifically includes:

[0010] Step S1: Determine the mean current value corresponding to the current measurement value sequence, and determine the difference between each current measurement value in the current current measurement value sequence and the mean current value;

[0011] Step S2: Based on the difference between each current measurement value in the current current measurement value sequence and the average current value, determine whether there is an abnormal current measurement value; if so, proceed to step S3; otherwise, proceed to step S5.

[0012] Step S3: Obtain the set of current measurement value sequences corresponding to the current transformer sequence set in the target long-distance transmission line within a preset time interval after the current moment, and determine whether there is a target current measurement value sequence including abnormal current measurement values ​​in the set of current measurement value sequences; if yes, proceed to step S4; otherwise, proceed to step S5.

[0013] Step S4: Determine that there is an anomaly in the target long-distance power transmission line;

[0014] Step S5: Determine that there is no abnormality in the target long-distance power transmission line.

[0015] According to a current transformer testing method provided by the present invention, the step of determining whether there are abnormal current measurement values ​​based on the difference between each current measurement value in the current measurement value sequence and the average current value specifically includes:

[0016] Determine whether there is a target difference exceeding a first preset threshold among the differences between each current measurement value and the mean current value in the current measurement value sequence;

[0017] If an abnormal current measurement value exists, it is determined that an abnormal current measurement value exists; otherwise, it is determined that an abnormal current measurement value does not exist.

[0018] According to a current transformer testing method provided by the present invention, determining the current theoretical current value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line specifically includes:

[0019] The current values ​​of the associated parameters of the target long-distance transmission line are input into the trained transmission line current prediction model, and the current theoretical current value sequence corresponding to the current transformer sequence is output.

[0020] The transmission line current prediction model is obtained by training based on the associated parameter samples of the target long-distance transmission line and the corresponding theoretical current value sequence labels of the samples. The theoretical current value sequence labels of the samples are the actual current value sequences of the samples.

[0021] According to a current transformer testing method provided by the present invention, the input current is measured by a first standard current sensor installed at the head end of the target long-distance transmission line, and the output current is measured by a second standard current sensor installed at the tail end of the target long-distance transmission line.

[0022] The line attribute parameters include the transmission line length, conductor material type, and line cross-sectional area, while the environmental parameters include temperature, humidity, and wind speed.

[0023] According to a current transformer testing method provided by the present invention, determining the measurement error of each current transformer in the current transformer sequence based on the current measured value sequence and the current theoretical value sequence corresponding to the current transformer sequence specifically includes:

[0024] Perform the following operations on each current transformer in the current transformer sequence:

[0025] Determine the current measured value and the current theoretical value of the current transformer;

[0026] The measurement error of the current transformer is determined based on the difference between the current measured value and the current theoretical value.

[0027] The present invention also provides a current transformer testing device, comprising:

[0028] The line anomaly judgment unit is used to obtain the current measurement value sequence corresponding to the current transformer sequence set in the target long-distance transmission line when the target long-distance transmission line is in operation, and to judge whether there is an anomaly in the target long-distance transmission line based on the current measurement value sequence.

[0029] The current theoretical value prediction unit is used to determine the current theoretical value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line, assuming that there are no abnormalities in the target long-distance transmission line; the associated parameters include input current, output current, line attribute parameters, and environmental parameters;

[0030] The measurement error determination unit is used to determine the measurement error of each current transformer in the current transformer sequence based on the current measured value sequence and the current theoretical value sequence corresponding to the current transformer sequence.

[0031] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the current transformer testing method as described above.

[0032] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the current transformer testing method as described above.

[0033] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the current transformer testing method as described above.

[0034] This invention provides a current transformer testing method, apparatus, electronic device, and storage medium. By acquiring the current measurement value sequence corresponding to the current transformer sequence installed in the target long-distance transmission line while the target long-distance transmission line is operating, and determining whether there is an anomaly in the target long-distance transmission line based on the current measurement value sequence; if there is no anomaly in the target long-distance transmission line, determining the current theoretical current value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line; the associated parameters include input current, output current, line attribute parameters, and environmental parameters; and determining the measurement error of each current transformer in the current transformer sequence based on the current measurement value sequence and the current theoretical current value sequence corresponding to the current transformer sequence. This allows for automated on-site testing of current transformers without power interruption, avoiding disruption to users' normal production and lives. Furthermore, the testing can be completed using existing power grid facilities without the need for dedicated testing instruments, significantly improving the testing efficiency of current transformers and reducing testing costs while ensuring the accuracy of test results. Attached Figure Description

[0035] Figure 1 This is a flowchart illustrating the current transformer testing method provided by the present invention.

[0036] Figure 2 This is a schematic diagram of the anomaly detection process for a target long-distance power transmission line provided by the present invention;

[0037] Figure 3 This is a schematic diagram of the current transformer testing device provided by the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0040] As mentioned earlier, existing accuracy testing of current transformers requires on-site testing under power outage conditions or removal and testing in a laboratory. Specifically, whether on-site or in the laboratory, a series of preset test current values ​​are set according to the specifications of the current transformer to simulate real power usage scenarios. By sequentially applying each preset test current to the current transformer, the current transformer is brought into normal operation under different load conditions, and the output current value of the current transformer under each test current condition is recorded. The performance of the current transformer is then evaluated based on the output current value. This testing method requires specialized closed-loop testing equipment, is cumbersome to operate, has low testing efficiency, and also poses certain safety risks. Furthermore, existing transmission lines are usually long, and the number of current transformers is large and widely distributed, further reducing the efficiency of on-site testing and affecting users' normal production and life.

[0041] In view of this, embodiments of this application provide a current transformer testing method, apparatus, electronic device, and storage medium, which can efficiently and accurately perform automated testing of current transformers without power interruption and without the aid of a closed-loop tester. For ease of understanding, the embodiments of this application will first be described in general. For example, the technical solutions provided by the embodiments of this application can be applied to software products. For instance, the methods provided by the embodiments of this application can be designed as application programs (i.e., software products) and then installed on electronic devices such as user terminals or server terminals to adapt the methods provided by the embodiments of this application.

[0042] For example, the software product can be installed on user-end electronic devices, including mobile phones, tablets, computers, and other electronic devices, and then the method provided in the embodiments of this application can be executed; the software product can also be installed on server-side electronic devices, including servers or server clusters, and then the method provided in the embodiments of this application can be executed.

[0043] In practical applications, this method can also be applied to hardware products. For example, a dedicated hardware device can be designed to implement the method provided in the embodiments of this application.

[0044] Figure 1 This is a flowchart illustrating the current transformer testing method provided by the present invention, applied to the accuracy testing of current transformer sequences installed in long-distance transmission lines, such as... Figure 1 As shown, the method includes:

[0045] Step 110: When the target long-distance transmission line is in operation, obtain the current measurement value sequence corresponding to the current transformer sequence set in the target long-distance transmission line, and determine whether there is an abnormality in the target long-distance transmission line based on the current measurement value sequence.

[0046] Specifically, it can be understood that the long-distance transmission line refers to a power line used to transmit electrical energy from a power plant to a load center far from the power generation site. Therefore, the starting point of the long-distance transmission line is located at the power plant, and the ending point is located at the distribution station. The long-distance transmission line typically has the following characteristics:

[0047] Transmission distance: Generally exceeding 100 kilometers, and can even reach several thousand kilometers; High voltage: To reduce energy loss, high-voltage transmission (such as 110kV and above) is usually used. Overhead or underground: It can be laid out using overhead lines or underground cables. Due to the excessively long transmission distance of long-distance transmission lines, in order to accurately and comprehensively monitor the status of the transmission lines, grid operators usually install multiple current transformers (i.e., current transformer sequences) at intervals along the transmission lines to understand the current situation throughout the entire transmission line. This results in existing on-site testing methods for current transformers being extremely labor-intensive and inefficient, while also posing a high risk to the personal safety of the testing personnel. Based on this, the current transformer testing method of this invention is used for the accuracy testing of current transformer sequences installed in long-distance transmission lines.

[0048] More specifically, this embodiment of the invention first requires identifying the target long-distance transmission line for which the current transformer sequence accuracy test will be performed. It can be understood that the target long-distance transmission line can be any long-distance transmission line within a substation / distribution station combination. Based on the foregoing, it can also be understood that this embodiment of the invention performs the current transformer sequence accuracy test while the target long-distance transmission line is operational. Testing in a real-world application scenario maximizes the accuracy of the test results. However, it is important to note that ensuring the accuracy of the current transformer test results in this embodiment of the invention relies on a crucial prerequisite: the target long-distance transmission line must be in normal operating condition, not a faulty state. This is because when the transmission line itself experiences a fault, the current measurement value of the current transformer will also be abnormal. In this case, it cannot be determined whether the abnormal current measurement value is caused by a transmission line fault or by performance degradation of the current transformer itself. Therefore, this embodiment of the invention first needs to determine whether the target long-distance transmission line has any abnormalities. The current transformer sequence accuracy test will only be performed if the target long-distance transmission line does not have any abnormalities.

[0049] Specifically, in this embodiment of the invention, under the condition that the target long-distance transmission line is operating, the current current measurement value sequence corresponding to the current transformer sequence installed in the target long-distance transmission line is obtained. It can be understood that the current current measurement value sequence is the sequence composed of the current current measurement values ​​of each current transformer in the current transformer sequence. Preferably, the current current measurement values ​​in the current current measurement value sequence are arranged according to the position of the current transformers in the current transformer sequence from near to far (i.e., from near to far from the starting end of the long-distance transmission line). Based on this, the current measurement values ​​in the current current measurement value sequence can be quickly matched with the corresponding current transformers. After obtaining the current current measurement value sequence corresponding to the current transformer sequence, this embodiment of the invention can determine whether there is an anomaly in the target long-distance transmission line based on the current current measurement value sequence. More specifically, Figure 2 This is a schematic diagram of the anomaly detection process for a target long-distance transmission line provided by the present invention, as shown below. Figure 2 As shown, the step of determining whether the target long-distance transmission line has any anomalies based on the current current measurement value sequence specifically includes:

[0050] Step S1: Determine the mean current value corresponding to the current measurement value sequence, and determine the difference between each current measurement value in the current current measurement value sequence and the mean current value;

[0051] Step S2: Based on the difference between each current measurement value in the current current measurement value sequence and the average current value, determine whether there is an abnormal current measurement value; if so, proceed to step S3; otherwise, proceed to step S5.

[0052] Step S3: Obtain the set of current measurement value sequences corresponding to the current transformer sequence set in the target long-distance transmission line within a preset time interval after the current moment, and determine whether there is a target current measurement value sequence including abnormal current measurement values ​​in the set of current measurement value sequences; if yes, proceed to step S4; otherwise, proceed to step S5.

[0053] Step S4: Determine that there is an anomaly in the target long-distance power transmission line;

[0054] Step S5: Determine that there is no abnormality in the target long-distance power transmission line.

[0055] This invention, through research, has discovered that the accuracy of current transformers in normal use gradually deteriorates over time; therefore, their current measurement values ​​do not undergo abrupt changes. Based on this, there should not be significant differences in the current measurement values ​​among a sequence of current transformers installed on the same long-distance transmission line. If such differences exist, it indicates an anomaly in the transmission line. Based on this principle, this embodiment of the invention, after obtaining the current measurement value sequence corresponding to the current transformer sequence, first determines the average current value corresponding to the current measurement value sequence, and then determines the difference between each current measurement value in the current measurement value sequence and the average current value. Based on this, it can determine whether there are abnormal current measurement values ​​based on the differences between each current measurement value in the current measurement value sequence and the average current value. More specifically, determining whether there are abnormal current measurement values ​​based on the differences between each current measurement value in the current measurement value sequence and the average current value specifically includes:

[0056] Determine whether there is a target difference exceeding a first preset threshold among the differences between each current measurement value and the mean current value in the current measurement value sequence;

[0057] If an abnormal current measurement value exists, it is determined that an abnormal current measurement value exists; otherwise, it is determined that an abnormal current measurement value does not exist.

[0058] It is understood that the first preset threshold can be determined by analyzing the current measurement values ​​in the historical fault information of the target long-distance transmission line. The threshold values ​​may differ for different long-distance transmission lines, and this embodiment of the invention does not specifically limit their values. Based on this, if there is a target difference exceeding the first preset threshold, it indicates that the corresponding current measurement value is abnormal (i.e., there is an abnormal current measurement value). However, it is worth noting that this invention has found through research that the presence of an abnormal current measurement value at a certain moment does not necessarily indicate that the transmission line is abnormal. In actual operation, the transmission line may experience brief fluctuations in current due to short-term external disturbances, but the current value will quickly return to normal. In such cases, it should not be judged that the transmission line is abnormal. Based on this, in order to ensure the accuracy of the transmission line abnormality judgment result and thus the accuracy of subsequent test results, this embodiment of the invention, when judging that there is an abnormal current measurement value, will further obtain the set of current measurement value sequences corresponding to the current transformer sequence set in the target long-distance transmission line within a preset time interval after the current moment. It is understood that the set of current measurement value sequences is the set of current measurement value sequences corresponding to different moments within the preset time interval. The preset time interval can also be determined by analyzing the current measurement values ​​in the historical fault information of the target long-distance transmission line, which will not be elaborated here in this embodiment of the invention.

[0059] After obtaining the aforementioned set of current measurement value sequences, this embodiment of the invention can further determine whether there is a target current measurement value sequence including abnormal current measurement values ​​in the set of current measurement value sequences. If it exists, it indicates that the abnormal current measurement values ​​are not caused by the aforementioned short-term external disturbances, and thus it can be determined that the target long-distance transmission line has an anomaly; otherwise, it is determined that the target long-distance transmission line does not have an anomaly. Based on this, this embodiment of the invention can maximize the accuracy of the anomaly judgment result of the target long-distance transmission line. It is understood that the process of determining whether there is a target current measurement value sequence including abnormal current measurement values ​​is the same as steps S1-S2, that is, the operation of steps S1-S2 is performed on each current measurement value sequence in the set of current measurement value sequences to determine whether there is an abnormal current measurement value. This embodiment of the invention will not be described in detail here.

[0060] Step 120: If there are no abnormalities in the target long-distance transmission line, determine the current theoretical current value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line; the associated parameters include input current, output current, line attribute parameters and environmental parameters;

[0061] Specifically, the input current is measured by a first standard current sensor located at the beginning of the target long-distance transmission line (i.e., the aforementioned starting end), and the output current is measured by a second standard current sensor located at the end of the target long-distance transmission line (i.e., the aforementioned ending end). The line attribute parameters include the transmission line length, conductor material type, and line cross-sectional area, and the environmental parameters include temperature, humidity, and wind speed. Based on the foregoing, it is understood that since the first and second standard current sensors are located in the power plant and distribution station respectively, and these locations are typically staffed, daily maintenance of the first and second standard current sensors is very convenient, ensuring the accuracy of the measured input and output currents.

[0062] This invention, through research on historical measurement data of long-distance transmission lines, reveals that current attenuation occurs during transmission from the beginning to the end of a long-distance transmission line. The specific attenuation ratio is influenced by a combination of factors, including the transmission line's attribute parameters (i.e., the aforementioned transmission line length, conductor material type, and cross-sectional area), environmental factors (i.e., the aforementioned temperature, humidity, and wind speed), and load conditions (which can be determined by the aforementioned output current). Based on this, this invention employs a current prediction model trained on associated parameter samples of the target long-distance transmission line and the corresponding theoretical current value sequence labels to accurately predict current values ​​at different locations within the target long-distance transmission line. It is understood that the theoretical current value sequence labels corresponding to the samples are the actual measured current value sequences corresponding to the samples. Both the associated parameter samples and the corresponding theoretical current value sequence labels of the target long-distance transmission line can be obtained from historical data of the target long-distance transmission line recorded in the power grid backend. The input current in the historical data is also measured by a first standard current sensor installed at the head end of the target long-distance transmission line, and the output current in the historical data is also measured by a second standard current sensor installed at the tail end of the target long-distance transmission line; the line attribute parameters are important design parameters and are also recorded in the historical data; the environmental parameters in the historical data are measured by corresponding sensors installed in the target long-distance transmission line.

[0063] It is important to note that although the measured current values ​​in the historical data of the target long-distance transmission line recorded by the power grid backend are obtained using current transformers maintained using existing current transformer testing methods, these methods, while inefficient, guarantee accuracy. Therefore, the accuracy of the prediction results from the trained transmission line current prediction model can be ensured.

[0064] Specifically, determining the current theoretical current value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line includes:

[0065] The current values ​​of the associated parameters of the target long-distance transmission line are input into the trained transmission line current prediction model, and the current theoretical current value sequence corresponding to the current transformer sequence is output.

[0066] Based on this, the embodiments of the present invention can efficiently and accurately output the current theoretical value sequence corresponding to the current transformer sequence, for subsequent evaluation of the accuracy of the current transformer sequence. Preferably, the current theoretical values ​​in the current theoretical value sequence are also arranged from near to far according to the position of the current transformers in the current transformer sequence. Based on this, the current theoretical values ​​in the current theoretical value sequence can be quickly matched with the current measured values ​​in the current measured value sequence, thereby ensuring the efficiency of the accuracy evaluation of the current transformer sequence.

[0067] Step 130: Based on the current measured value sequence and the current theoretical value sequence corresponding to the current transformer sequence, determine the measurement error of each current transformer in the current transformer sequence.

[0068] Specifically, determining the measurement error of each current transformer in the current transformer sequence based on the current measured value sequence and the current theoretical value sequence corresponding to the current transformer sequence includes:

[0069] Perform the following operations on each current transformer in the current transformer sequence:

[0070] Determine the current measured value and the current theoretical value of the current transformer;

[0071] The measurement error of the current transformer is determined based on the difference between the current measured value and the current theoretical value.

[0072] It is understood that the measurement error can be characterized by the ratio of the difference between the current measured value and the current theoretical value to the current theoretical value. Of course, other similar parameters can also be used, and this embodiment of the invention does not specifically limit this. It is also understood that after determining the measurement error of the current transformer, it can be assessed whether the measurement error exceeds a warning value, thereby determining whether maintenance or replacement is necessary. The warning value can be set according to current standards or experience, and this embodiment of the invention does not specifically limit this. Based on this, the current transformer testing method of this embodiment of the invention can simultaneously consider the accuracy, efficiency, and cost of inductor measurement.

[0073] In summary, the current transformer testing method provided by this invention obtains the current measurement value sequence corresponding to the current transformer sequence set in the target long-distance transmission line while the target long-distance transmission line is operating, and determines whether there is an anomaly in the target long-distance transmission line based on the current current measurement value sequence; if there is no anomaly in the target long-distance transmission line, the current theoretical current value sequence corresponding to the current transformer sequence is determined based on the current values ​​of the associated parameters of the target long-distance transmission line; the associated parameters include input current, output current, line attribute parameters, and environmental parameters; based on the current current measurement value sequence and the current theoretical current value sequence corresponding to the current transformer sequence, the measurement error of each current transformer in the current transformer sequence is determined. This method enables automated on-site testing of current transformers without power outages, avoiding disruption to users' normal production and life. Furthermore, the testing can be completed using existing power grid facilities without the need for dedicated testing instruments, significantly improving the testing efficiency of current transformers and reducing testing costs while ensuring the accuracy of test results.

[0074] The current transformer testing device provided by the present invention is described below. The current transformer testing device described below and the current transformer testing method described above can be referred to in correspondence.

[0075] Based on any of the above embodiments Figure 3 This is a schematic diagram of the current transformer testing device provided by the present invention, which is applied to the accuracy testing of current transformer sequences installed in long-distance transmission lines, such as... Figure 3 As shown, the device includes:

[0076] The line anomaly judgment unit 310 is used to obtain the current measurement value sequence corresponding to the current transformer sequence set in the target long-distance transmission line when the target long-distance transmission line is in operation, and to judge whether there is an anomaly in the target long-distance transmission line based on the current measurement value sequence.

[0077] The current theoretical value prediction unit 320 is used to determine the current theoretical value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line, provided that there are no abnormalities in the target long-distance transmission line; the associated parameters include input current, output current, line attribute parameters, and environmental parameters;

[0078] The measurement error determination unit 330 is used to determine the measurement error of each current transformer in the current transformer sequence based on the current measured value sequence and the current theoretical value sequence corresponding to the current transformer sequence.

[0079] The apparatus provided in this embodiment of the invention, through a line anomaly judgment unit 310, acquires the current measurement value sequence corresponding to the current transformer sequence set in the target long-distance transmission line when the target long-distance transmission line is operating, and determines whether there is an anomaly in the target long-distance transmission line based on the current current measurement value sequence; if there is no anomaly in the target long-distance transmission line, a current theoretical value prediction unit 320 determines the current theoretical value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line; the associated parameters include input current, output current, line attribute parameters, and environmental parameters; a measurement error determination unit 330 determines the measurement error of each current transformer in the current transformer sequence based on the current current measurement value sequence and the current theoretical value sequence corresponding to the current transformer sequence. This allows for automated on-site testing of current transformers without power interruption, avoiding disruption to users' normal production and life. Furthermore, the testing can be completed using existing power grid facilities without the need for dedicated testing instruments, significantly improving the testing efficiency of current transformers and reducing testing costs while ensuring the accuracy of test results.

[0080] Based on any of the above embodiments, determining whether the target long-distance transmission line has any abnormalities based on the current current measurement value sequence specifically includes:

[0081] Step S1: Determine the mean current value corresponding to the current measurement value sequence, and determine the difference between each current measurement value in the current current measurement value sequence and the mean current value;

[0082] Step S2: Based on the difference between each current measurement value in the current current measurement value sequence and the average current value, determine whether there is an abnormal current measurement value; if so, proceed to step S3; otherwise, proceed to step S5.

[0083] Step S3: Obtain the set of current measurement value sequences corresponding to the current transformer sequence set in the target long-distance transmission line within a preset time interval after the current moment, and determine whether there is a target current measurement value sequence including abnormal current measurement values ​​in the set of current measurement value sequences; if yes, proceed to step S4; otherwise, proceed to step S5.

[0084] Step S4: Determine that there is an anomaly in the target long-distance power transmission line;

[0085] Step S5: Determine that there is no abnormality in the target long-distance power transmission line.

[0086] Based on any of the above embodiments, determining whether there are abnormal current measurement values ​​based on the difference between each current measurement value in the current current measurement value sequence and the average current value specifically includes:

[0087] Determine whether there is a target difference exceeding a first preset threshold among the differences between each current measurement value and the mean current value in the current measurement value sequence;

[0088] If an abnormal current measurement value exists, it is determined that an abnormal current measurement value exists; otherwise, it is determined that an abnormal current measurement value does not exist.

[0089] Based on any of the above embodiments, determining the current theoretical current value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line specifically includes:

[0090] The current values ​​of the associated parameters of the target long-distance transmission line are input into the trained transmission line current prediction model, and the current theoretical current value sequence corresponding to the current transformer sequence is output.

[0091] The transmission line current prediction model is obtained by training based on the associated parameter samples of the target long-distance transmission line and the corresponding theoretical current value sequence labels of the samples. The theoretical current value sequence labels of the samples are the actual current value sequences of the samples.

[0092] Based on any of the above embodiments, the input current is measured by a first standard current sensor installed at the head end of the target long-distance transmission line, and the output current is measured by a second standard current sensor installed at the tail end of the target long-distance transmission line.

[0093] The line attribute parameters include the transmission line length, conductor material type, and line cross-sectional area, while the environmental parameters include temperature, humidity, and wind speed.

[0094] Based on any of the above embodiments, determining the measurement error of each current transformer in the current transformer sequence based on the current measured value sequence and the current theoretical value sequence corresponding to the current transformer sequence specifically includes:

[0095] Perform the following operations on each current transformer in the current transformer sequence:

[0096] Determine the current measured value and the current theoretical value of the current transformer;

[0097] The measurement error of the current transformer is determined based on the difference between the current measured value and the current theoretical value.

[0098] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention, such as... Figure 4As shown, the electronic device may include a processor 410, a memory 420, a communication interface 430, and a communication bus 440, wherein the processor 410, memory 420, and communication interface 430 communicate with each other through the communication bus 440. The processor 410 can call logic instructions in the memory 420 to execute a current transformer testing method. This method includes: when the target long-distance transmission line is operating, acquiring the current current measurement value sequence corresponding to the current transformer sequence set in the target long-distance transmission line, and determining whether there is an anomaly in the target long-distance transmission line based on the current current measurement value sequence; if there is no anomaly in the target long-distance transmission line, determining the current theoretical current value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line; the associated parameters include input current, output current, line attribute parameters, and environmental parameters; and determining the measurement error of each current transformer in the current transformer sequence based on the current current measurement value sequence and the current theoretical current value sequence corresponding to the current transformer sequence.

[0099] Furthermore, the logical instructions in the aforementioned memory 420 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0100] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, wherein when the program instructions are executed by a computer, the computer is able to execute the current transformer testing method provided by the above methods, the method comprising: when the target long-distance transmission line is operating, acquiring the current measurement value sequence corresponding to the current transformer sequence set in the target long-distance transmission line, and determining whether there is an abnormality in the target long-distance transmission line based on the current measurement value sequence; when there is no abnormality in the target long-distance transmission line, determining the current theoretical current value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line; the associated parameters include input current, output current, line attribute parameters and environmental parameters; and determining the measurement error of each current transformer in the current transformer sequence based on the current measurement value sequence and the current theoretical current value sequence corresponding to the current transformer sequence.

[0101] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the aforementioned current transformer testing methods. The method includes: when a target long-distance transmission line is in operation, acquiring a sequence of current measurement values ​​corresponding to a sequence of current transformers installed in the target long-distance transmission line, and determining whether the target long-distance transmission line has any abnormalities based on the current current measurement value sequence; if the target long-distance transmission line does not have any abnormalities, determining a sequence of current theoretical values ​​corresponding to the current transformer sequence based on the current values ​​of associated parameters of the target long-distance transmission line; the associated parameters include input current, output current, line attribute parameters, and environmental parameters; and determining the measurement error of each current transformer in the current transformer sequence based on the current current measurement value sequence and the current theoretical value sequence corresponding to the current transformer sequence.

[0102] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0103] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A current transformer testing method, applied to the accuracy testing of current transformer sequences installed in long-distance transmission lines, characterized in that, include: When the target long-distance transmission line is in operation, the current current measurement value sequence corresponding to the current transformer sequence set in the target long-distance transmission line is obtained, and the abnormality of the target long-distance transmission line is determined based on the current current measurement value sequence. If there are no abnormalities in the target long-distance transmission line, the current theoretical current value sequence corresponding to the current transformer sequence is determined based on the current values ​​of the associated parameters of the target long-distance transmission line. The associated parameters include input current, output current, line attribute parameters, and environmental parameters; Based on the current current measurement value sequence and the current current theoretical value sequence corresponding to the current transformer sequence, the measurement error of each current transformer in the current transformer sequence is determined. The determination of the current theoretical current value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line specifically includes: The current values ​​of the associated parameters of the target long-distance transmission line are input into the trained transmission line current prediction model, and the current theoretical current value sequence corresponding to the current transformer sequence is output. The transmission line current prediction model is obtained by training based on the associated parameter samples of the target long-distance transmission line and the corresponding theoretical current value sequence labels of the samples. The theoretical current value sequence labels of the samples are the actual current value sequences of the samples. The input current is measured by a first standard current sensor installed at the head end of the target long-distance transmission line, and the output current is measured by a second standard current sensor installed at the tail end of the target long-distance transmission line. The line attribute parameters include the transmission line length, conductor material type, and line cross-sectional area, while the environmental parameters include temperature, humidity, and wind speed.

2. The current transformer testing method according to claim 1, characterized in that, The step of determining whether the target long-distance transmission line has any anomalies based on the current current measurement value sequence specifically includes: Step S1: Determine the mean current value corresponding to the current measurement value sequence, and determine the difference between each current measurement value in the current current measurement value sequence and the mean current value; Step S2: Based on the difference between each current measurement value in the current current measurement value sequence and the average current value, determine whether there is an abnormal current measurement value; if so, proceed to step S3; otherwise, proceed to step S5. Step S3: Obtain the set of current measurement value sequences corresponding to the current transformer sequence set in the target long-distance transmission line within a preset time interval after the current moment, and determine whether there is a target current measurement value sequence including abnormal current measurement values ​​in the set of current measurement value sequences; if yes, proceed to step S4; otherwise, proceed to step S5. Step S4: Determine that there is an anomaly in the target long-distance power transmission line; Step S5: Determine that there is no abnormality in the target long-distance power transmission line.

3. The current transformer testing method according to claim 2, characterized in that, The step of determining whether there are abnormal current measurements based on the difference between each current measurement value in the current current measurement value sequence and the average current value specifically includes: Determine whether there is a target difference exceeding a first preset threshold among the differences between each current measurement value and the mean current value in the current measurement value sequence; If an abnormal current measurement value exists, it is determined that an abnormal current measurement value exists; otherwise, it is determined that an abnormal current measurement value does not exist.

4. The current transformer testing method according to claim 1, characterized in that, The determination of the measurement error of each current transformer in the current transformer sequence based on the current measured value sequence and the current theoretical value sequence corresponding to the current transformer sequence specifically includes: Perform the following operations on each current transformer in the current transformer sequence: Determine the current measured value and the current theoretical value of the current transformer; The measurement error of the current transformer is determined based on the difference between the current measured value and the current theoretical value.

5. A current transformer testing device, used for accuracy testing of current transformer sequences installed in long-distance transmission lines, characterized in that, include: The line anomaly judgment unit is used to obtain the current measurement value sequence corresponding to the current transformer sequence set in the target long-distance transmission line when the target long-distance transmission line is in operation, and to judge whether there is an anomaly in the target long-distance transmission line based on the current measurement value sequence. The current theoretical value prediction unit is used to determine the current theoretical value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line, when there are no abnormalities in the target long-distance transmission line. The associated parameters include input current, output current, line attribute parameters, and environmental parameters; The measurement error determination unit is used to determine the measurement error of each current transformer in the current transformer sequence based on the current measured value sequence and the current theoretical value sequence corresponding to the current transformer sequence. The determination of the current theoretical current value sequence corresponding to the current transformer sequence based on the current values ​​of the associated parameters of the target long-distance transmission line specifically includes: The current values ​​of the associated parameters of the target long-distance transmission line are input into the trained transmission line current prediction model, and the current theoretical current value sequence corresponding to the current transformer sequence is output. The transmission line current prediction model is obtained by training based on the associated parameter samples of the target long-distance transmission line and the corresponding theoretical current value sequence labels of the samples. The theoretical current value sequence labels of the samples are the actual current value sequences of the samples. The input current is measured by a first standard current sensor installed at the head end of the target long-distance transmission line, and the output current is measured by a second standard current sensor installed at the tail end of the target long-distance transmission line. The line attribute parameters include the transmission line length, conductor material type, and line cross-sectional area, while the environmental parameters include temperature, humidity, and wind speed.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the current transformer testing method as described in any one of claims 1 to 4.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the current transformer testing method as described in any one of claims 1 to 4.

8. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the current transformer testing method as described in any one of claims 1 to 4.

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