Line longitudinal current differential protection joint debugging acceptance method and related device

Abstract

The invention provides a line pilot current differential protection joint debugging acceptance method and a related device, and belongs to the field of power system power transmission line protection. The method is used for joint debugging of longitudinal current differential protection channels on the two sides of a power transmission line, and in the implementation process, optical fiber data, electrical quantity data, a protection device version number and protection pressing plate data are firstly obtained. And judging whether the channel is normal based on the optical fiber data, if so, simulating various working conditions for the protection device and the pressing plate on any side of the channel, and checking the static characteristics of the channel according to the electrical quantity on the other side and the feedback of the protection pressing plate data. When the states of the channels on the two sides are checked to be correct, line protection device channel joint debugging is carried out, and dynamic behaviors are checked according to protection action conditions on the two sides. And finally, generating a joint debugging acceptance report corresponding to the version number of the protection device in combination with an inspection result. Through automatic data acquisition, analysis and report generation processes, the dependence on manual subjective judgment can be reduced, and the accuracy and consistency of test results are improved.

Description

Technical Field

[0001] This invention belongs to the field of power system transmission line protection technology, specifically relating to a method and related device for commissioning and acceptance of longitudinal current differential protection for power lines. Background Technology

[0002] Transmission lines with voltage levels of 220kV and above are generally equipped with longitudinal current differential protection. Longitudinal current differential protection is a main protection system used in power system transmission lines. It determines the fault location by comparing the currents at both ends of the line, featuring high sensitivity and fast operation. Based on Kirchhoff's current law, during normal operation or external faults, the currents at both ends of the line are equal, and the differential current is zero; during internal faults, the differential current is not zero, and the protection device determines the fault and operates accordingly. Longitudinal current differential protection has advantages such as stable protection range, high sensitivity, fast operation, and minimal impact from changes in system operating conditions. Before commissioning high-voltage transmission lines, the relay protection devices at both ends of the line and the longitudinal protection channel should undergo joint commissioning and acceptance testing.

[0003] The current common practice involves two commissioning personnel communicating by phone. On one side, the electrical quantity is increased, while on the other side, the received electrical quantity is checked for accuracy. The relay protection testers on both sides are then manually triggered to output fault values, simulating a line fault and checking the operation of the protection devices. This commissioning method relies on the subjective judgment of the personnel, resulting in unique test results. Report output is not standardized; the format and content of test reports are inconsistent, hindering communication and learning among technical personnel. Furthermore, the lack of automated judgment and analysis of test results makes it easy to overlook their accuracy. Currently, no effective solution has been proposed to address these problems. Summary of the Invention

[0004] In view of this, the present invention aims to provide a method and related device for commissioning and acceptance of longitudinal current differential protection for transmission lines. By automating data acquisition, analysis and report generation, it reduces reliance on subjective judgment of personnel and improves the accuracy and consistency of test results; it standardizes the output format and content of test reports, facilitating communication and learning among technical personnel; it enables automatic judgment and analysis of test results, timely detection of problems in test results, and ensures the reliable operation of longitudinal current differential protection in high-voltage transmission lines.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0006] In a first aspect, the present invention provides a method for commissioning and acceptance of longitudinal current differential protection for transmission lines, applicable to the commissioning of longitudinal current differential protection channels on both sides of a transmission line, comprising the following steps:

[0007] Acquire fiber optic data for dual-channel transmission line protection, electrical quantity data on both sides of the line, protection device version number, and protection pressure plate data;

[0008] Based on fiber optic data, determine whether the fiber optic channel is working properly. Under normal channel conditions, simulate different working conditions for the protection devices and pressure plates on either side of the channel. Check the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line based on the feedback of electrical quantity data and protection pressure plate data on the other side of the channel.

[0009] If the status checks of the longitudinal current differential protection channels on both sides of the transmission line are correct, the protection device channels of the line are jointly debugged, and the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line is checked according to the protection action on both sides of the line.

[0010] Based on the static characteristic inspection results and dynamic behavior inspection results of the longitudinal current differential protection channels on both sides of the transmission line, a joint commissioning and acceptance report for the protection device version number of the longitudinal current differential protection is generated.

[0011] Furthermore, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line include: the protection device and the channel status;

[0012] Under normal conditions, different operating conditions are simulated for the protection devices on either side of the transmission line. Based on the feedback of electrical quantity data from the other side of the transmission line, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including:

[0013] For any normal fiber optic channel, a secondary current is applied to the protection device on either side of the normal channel, and the secondary current sampling data and differential current data of the channel on the side where the current is applied, as well as the secondary current sampling data and differential current data of the same channel on the opposite side, are obtained as feedback data.

[0014] Check whether the feedback data results on both sides are correct. If they are incorrect, check the device settings, protection channel status and current loop wiring, and process the problems found. If they are correct, determine that the corresponding static characteristics are correct.

[0015] Furthermore, a secondary current is applied to the protection device on either side of the channel, and the feedback data from both sides is acquired and checked for accuracy, including:

[0016] Apply three different current values ​​to the secondary circuit of the protection and check whether the secondary current sampling data and differential current data of the same channel on this side and the opposite side are correct.

[0017] Add the three-phase rated current value to the secondary circuit of the protection system, and then check again whether the secondary current sampling data and differential current data obtained from the same channel on this side and the opposite side are correct.

[0018] Furthermore, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line also include: the uniqueness of the pressure plate;

[0019] Under normal conditions, different operating conditions are simulated on the pressure plates on either side of the transmission line. Based on the feedback data from the protection pressure plates on the other side of the transmission line, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including:

[0020] For any normal fiber optic channel, remove the pressure plate of the normal channel on either side and check if the other side shows that the pressure plate on the other side has been removed or that the normal channel has been removed. If not, check the pressure plate wiring and provide feedback on any problems found. If correct, then the corresponding static characteristics are considered to be correct.

[0021] Furthermore, the static characteristics of the longitudinal current differential protection channels on both sides of the transmission line also include: channel uniqueness;

[0022] Under normal conditions, different operating conditions are simulated on the pressure plates on either side of the transmission line. Based on the feedback data from the protection pressure plates on the other side of the transmission line, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including:

[0023] For any normal fiber optic channel, disconnect the pigtail of the normal channel on the opposite side and check if the normal channel data is displayed on this side. If not, check the channel wiring and provide feedback on any problems found. If correct, then the corresponding static characteristics are considered to be correct.

[0024] Furthermore, dynamic behavior refers to the actions of the protection systems on both sides under different fault conditions;

[0025] The line protection device channels were jointly tested and adjusted, and the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line was checked based on the protection operation on both sides of the line, including:

[0026] For any normal fiber optic channel, ensure that the main protection pressure plates on both sides of the channel are engaged. If they are not engaged, neither side of the protection will activate.

[0027] When the switch on this side is in the closed position, the following checks are performed:

[0028] If the switch on the opposite side is in the open position, and a three-phase fault is simulated on this side, check whether the protection on this side achieves three-phase tripping and whether the protection on the opposite side does not operate. If so, the judgment is correct. If a single-phase fault is simulated on this side, check whether the protection on this side trips only and whether the protection on the opposite side does not operate. If so, the judgment is correct.

[0029] If the switch on the opposite side is in the closed position and the voltage transformer TV is disconnected, a three-phase fault is simulated on this side. Check if the protection on this side trips three times and if the protection on the opposite side trips three times. If so, the judgment is correct. If a single-phase fault is simulated on this side, check if the protection on this side trips only once and if the protection on the opposite side trips only once. If so, the judgment is correct.

[0030] If the switch on the opposite side is closed and the voltage transformer TV is normal, simulate a three-phase fault on this side and check whether the protection on this side does not operate and whether the protection on the opposite side does not operate. If so, the judgment is correct. Simulate a single-phase fault on this side and check whether the protection on this side does not operate and whether the protection on the opposite side does not operate. If so, the judgment is correct.

[0031] If the switch on the opposite side is in the closed position, the voltage transformer induced voltage is lower than 65% of the rated voltage and the voltage transformer TV is not disconnected, simulate a three-phase fault on this side, check if the protection on this side trips three times and if the protection on the opposite side trips three times. If so, the judgment is correct. Simulate a single-phase fault on this side, check if the protection on this side trips only once and if the protection on the opposite side trips only once. If so, the judgment is correct.

[0032] If the switch on the opposite side is in the closed position and the protection is activated, the simulated trip relay TJR on this side will operate. Check whether the switch on this side trips three times and whether the protection on the opposite side trips three times. If so, the judgment is correct.

[0033] Furthermore, acquiring fiber optic data for dual-channel transmission line protection, electrical quantity data on both sides of the line, protection device version number, and protection pressure plate data specifically includes:

[0034] Acquire the optical power of each node in the dual-channel line protection system of the substation, the current transformer ratio on both sides of the line under test, the protection device version number, secondary current data, secondary voltage data, protection pressure plate and channel optical fiber.

[0035] Secondly, this invention provides a line longitudinal current differential protection commissioning and acceptance device, applied to the commissioning of longitudinal current differential protection channels on both sides of a transmission line, comprising:

[0036] Data input module, data analysis module, and data display module;

[0037] The data input module is used to acquire and input the fiber optic data of the dual-channel transmission line protection, the electrical quantity data of both sides of the line, the protection device version number, and the protection pressure plate data;

[0038] The data analysis module is used to determine whether the fiber optic channel is working properly based on fiber optic data. Under normal channel conditions, it simulates different operating conditions for the protection devices and pressure plates on either side of the channel. Based on the feedback from the electrical quantity data and protection pressure plate data on the other side of the channel, it checks the static characteristics of the longitudinal current differential protection channels on both sides of the transmission line. It is also used to perform joint commissioning of the line protection device channels when the status checks of the longitudinal current differential protection channels on both sides of the transmission line are correct, and to check the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line based on the protection actions on both sides. Finally, it generates a joint commissioning and acceptance report for the longitudinal current differential protection with the protection device version number based on the static characteristic check results and dynamic behavior check results of the longitudinal current differential protection channels on both sides of the transmission line.

[0039] The data display module is used to display the commissioning and acceptance report of the longitudinal current differential protection.

[0040] Thirdly, the present invention provides a computer device, the device including a processor and a memory:

[0041] The memory is used to store computer programs and send the instructions of the computer programs to the processor;

[0042] The processor executes, according to the instructions of the computer program, a method for commissioning and accepting longitudinal current differential protection of a line, as described in the first aspect.

[0043] Fourthly, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements a line longitudinal current differential protection commissioning and acceptance method as described in the first aspect.

[0044] In summary, this invention provides a method and related apparatus for the joint commissioning and acceptance of longitudinal current differential protection on both sides of a transmission line. This invention acquires fiber optic data of the dual-channel protection of the transmission line, electrical quantity data of both sides of the line, protection device version number, and protection pressure plate data. Based on the fiber optic data, it determines whether the fiber optic channel is functioning correctly. Under normal channel conditions, it simulates different operating conditions for the protection device and pressure plate on either side of the channel. Based on the feedback from the electrical quantity data and protection pressure plate data of the other side of the channel, it checks the static characteristics of the longitudinal current differential protection channels on both sides of the transmission line. If the status checks of the longitudinal current differential protection channels on both sides of the transmission line are correct, it performs joint commissioning of the line protection device channels and checks the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line based on the protection actions on both sides of the line. Based on the static characteristic check results and dynamic behavior check results of the longitudinal current differential protection channels on both sides of the transmission line, it generates a joint commissioning and acceptance report for the corresponding protection device version number. This invention reduces reliance on subjective judgment by staff through automated data acquisition, analysis, and report generation, thereby improving the accuracy and consistency of test results; it standardizes the output format and content of test reports, facilitating communication and learning among technical personnel; and it enables automatic judgment and analysis of test results, promptly identifying problems in the test results and ensuring the reliable operation of longitudinal current differential protection in high-voltage transmission lines. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A flowchart of a line longitudinal current differential protection commissioning and acceptance method provided in an embodiment of the present invention;

[0047] Figure 2 This is an overall flowchart of the commissioning and acceptance process for the line longitudinal current differential protection provided in an embodiment of the present invention;

[0048] Figure 3 A flowchart of a static characteristic inspection process provided in an embodiment of the present invention;

[0049] Figure 4 A flowchart of the dynamic behavior inspection process provided in an embodiment of the present invention;

[0050] Figure 5 A block diagram of a line longitudinal current differential protection commissioning and acceptance device provided in an embodiment of the present invention;

[0051] Figure 6 This is a block diagram of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0052] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0053] Please see Figure 1 This invention provides a method for commissioning and accepting longitudinal current differential protection on both sides of a transmission line, applicable to the commissioning of longitudinal current differential protection channels on both sides of a transmission line, including the following steps:

[0054] S1: Obtain fiber optic data for dual-channel transmission line protection, electrical quantity data on both sides of the line, protection device version number, and protection pressure plate data.

[0055] It should be noted that the fiber optic data includes information such as the optical power of each node in the dual-channel protection of the transmission line. This data can be used to determine the transmission performance and status of the fiber optic channel. For example, the magnitude of the optical power can reflect the transmission loss of the signal in the fiber optic cable.

[0056] Electrical quantity data refers to secondary current data, secondary voltage data, etc. on both sides of the line. These data can reflect the actual electrical state of the line and can be used to assess whether the protection device is operating correctly.

[0057] The protection device version number records the software or hardware version of the protection device. Since different versions of protection devices may have functional differences or performance optimizations, the version factor needs to be considered in subsequent analysis and judgment.

[0058] The protection pressure plate data refers to the status (engaged or deactivated) information of the protection pressure plate. The status of the protection pressure plate directly affects the function of the protection device. By obtaining its data, we can understand the current working mode of the protection device.

[0059] S2: Based on fiber optic data, determine whether the fiber optic channel is working properly. Under normal channel conditions, simulate different working conditions for the protection devices and pressure plates on either side of the channel. Based on the feedback from the electrical quantity data and protection pressure plate data on the other side of the channel, check the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line.

[0060] It should be noted that static characteristics mainly refer to the characteristics exhibited by the protection channel and related devices under stable conditions.

[0061] In this embodiment, after determining that the fiber optic channel is normal through fiber optic data, different operating conditions are simulated for the protection device and pressure plate on either side of the channel. Then, the static characteristics are checked based on the feedback from the electrical quantity data and protection pressure plate data on the other side of the channel. This involves checking whether the protection device can accurately reflect and transmit information under different static conditions (such as different pressure plate states, different electrical quantity inputs, etc.), including the accuracy of the protection device's settings, the impact of the correct engagement / disengagement of the pressure plate on the protection function, and the accurate acquisition and transmission of electrical quantity data. For example, after determining that the fiber optic channel is normal, different operating conditions are applied to the protection device on either side of the channel (e.g., applying different secondary current values), while simultaneously changing the state of the pressure plate (e.g., engaging or disengaging the pressure plate). Then, the feedback from the electrical quantity data (e.g., secondary current sampling data, differential current data) and protection pressure plate data (e.g., whether the pressure plate state changes are correctly displayed) on the other side of the channel is observed. These feedbacks are used to check the static characteristics of the longitudinal current differential protection channels on both sides of the transmission line. For example, they check whether the protection device and channel status are normal, the uniqueness of the pressure plate (i.e., if the status of one pressure plate changes, the other side can reflect it correctly), and the uniqueness of the channel (e.g., if one side of the pigtail is pulled out, the other side should not display the corresponding channel data).

[0062] S3: If the status checks of the longitudinal current differential protection channels on both sides of the transmission line are correct, conduct joint commissioning of the line protection device channels, and check the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line based on the protection operation status on both sides of the line.

[0063] It should be noted that dynamic behavior refers to the response and performance of the protection channel and related devices when the protection device undergoes dynamic processes such as action or failure.

[0064] In this embodiment, after verifying the correct status of the longitudinal current differential protection channels on both sides of the transmission line, the protection device channels are jointly commissioned, and their dynamic behavior is checked based on the operation of the protection devices on both sides of the line. This includes observing whether the protection channels can quickly and accurately transmit current differential information during dynamic processes such as simulating fault occurrence, protection device operation, and fault clearing, so that the protection devices on both sides can correctly coordinate their actions to achieve rapid fault identification and clearing. For example, after verifying that the static characteristics of both channels are correct, the line protection device channels are jointly commissioned to simulate various situations that may occur in actual operation, such as different fault types (three-phase faults, single-phase faults, etc.).

[0065] During the joint commissioning process, observe the operation of the protection systems on both sides of the line, and determine whether the protection systems on both sides are operating correctly based on the pre-set protection operation logic and standards. For example, under specific fault conditions, the protection system on this side should trip three times or trip once, and the protection system on the opposite side should have a corresponding action response. If the actual operation does not match the expectation, it indicates that there may be a problem, and further investigation is needed.

[0066] S4: Generate a joint commissioning and acceptance report for the longitudinal current differential protection with the protection device version number based on the static characteristic inspection results and dynamic behavior inspection results of the longitudinal current differential protection channels on both sides of the transmission line.

[0067] It should be noted that the static characteristic inspection results obtained in step S2 (such as whether each inspection passed, existing problems, etc.) and the dynamic behavior inspection results obtained in step S3 (such as whether the operation of the protection on both sides meets expectations) are summarized. Based on the summarized results and the version number of the protection device, a longitudinal current differential protection commissioning and acceptance report is generated. The report should clearly record the inspection process, results, and conclusions to provide a basis for subsequent maintenance, evaluation, and decision-making.

[0068] This embodiment provides a method for the joint commissioning and acceptance of longitudinal current differential protection on both sides of a transmission line. Through steps such as data acquisition, static characteristic inspection, dynamic behavior inspection, and report generation, it can comprehensively and systematically conduct joint commissioning and acceptance of the longitudinal current differential protection channels on both sides of the transmission line. From the collection of basic data to characteristic inspections under different operating conditions, to dynamic testing simulating actual faults, and finally to the generation of a detailed acceptance report, it ensures the reliable operation of the longitudinal current differential protection in high-voltage transmission lines, improves the performance and stability of the protection device, and reduces potential safety hazards caused by protection device failures or malfunctions.

[0069] The method proposed in this embodiment adopts a hierarchical inspection approach, first checking static characteristics and then checking dynamic behavior. In the static characteristic inspection, the performance of the protection channel under stable conditions is verified by simulating different operating conditions, ensuring that the protection device and pressure plate can work accurately under various static conditions. In the dynamic behavior inspection, the performance of the protection channel during dynamic processes such as the operation of the protection device is observed. This hierarchical inspection method can more meticulously and comprehensively identify problems in the protection channel, improving the accuracy and reliability of the inspection. Simultaneously, based on the collected data and inspection results, a longitudinal current differential protection commissioning and acceptance report with the corresponding protection device version number is automatically generated. This automates the process from data acquisition and analysis to report generation, reducing manual intervention, minimizing errors caused by subjective judgment, improving the accuracy and consistency of test results, and standardizing the acceptance process and the output format and content of test reports. This facilitates communication and learning among technical personnel and greatly improves acceptance efficiency.

[0070] In one embodiment, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line include: the protection device and the channel status;

[0071] Under normal conditions, different operating conditions are simulated for the protection devices on either side of the transmission line. Based on the feedback of electrical quantity data from the other side of the transmission line, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including:

[0072] For any normal fiber optic channel, a secondary current is applied to the protection device on either side of the normal channel, and the secondary current sampling data and differential current data of the channel on the side where the current is applied, as well as the secondary current sampling data and differential current data of the same channel on the opposite side, are obtained as feedback data.

[0073] Check whether the feedback data results on both sides are correct. If they are incorrect, check the device settings, protection channel status and current loop wiring, and process the problems found. If they are correct, determine that the corresponding static characteristics are correct.

[0074] In this embodiment, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are defined, encompassing both the protection device and the channel status. When the channel is determined to be in a normal state, the static characteristics are checked by simulating different operating conditions on the protection device on either side of the channel, as different operating conditions can more fully verify the performance of the protection device under various circumstances. Specifically, for any normal fiber optic channel, a secondary current is applied to the protection device on either side of the channel. The purpose of this is to obtain secondary current sampling data and differential current data on the side where the current is applied, and also to obtain secondary current sampling data and differential current data on the opposite side of the same channel. These data are used as feedback data. The reason for obtaining data from both sides is that by comparing the feedback data from both sides, the performance of the protection channel can be more accurately determined. Next, the feedback data results from both sides are checked. If the results are incorrect, the device settings, protection channel status, and current loop wiring are further checked for rationality. Any problems found are then addressed. This series of operations aims to identify and resolve the causes of incorrect feedback data. If the feedback data results are correct, the corresponding static characteristics can be determined to be correct. This final judgment of the static characteristics of the protection channel is based on the feedback data, ensuring that the static performance of the protection device and channel meets the requirements under normal channel conditions. This provides an important basis for further evaluation of the protection channel and ensuring its normal operation.

[0075] In a further embodiment, a secondary current is applied to the protection device on either side of the channel, and the feedback data results from both sides are acquired and checked for correctness, including:

[0076] Apply three different current values ​​to the secondary circuit of the protection and check whether the secondary current sampling data and differential current data of the same channel on this side and the opposite side are correct.

[0077] Add the three-phase rated current value to the secondary circuit of the protection system, and then check again whether the secondary current sampling data and differential current data obtained from the same channel on this side and the opposite side are correct.

[0078] In this embodiment, three different phase current values ​​are first applied to the secondary circuit of the protection system. This is done to simulate various operating conditions and comprehensively test the performance of the protection device and the transmission channel under non-rated conditions. By checking the secondary current sampling data and differential current data results of the same channel on both sides, it can be determined whether the protection device can accurately collect and transmit current information under different current inputs. Next, three-phase rated current values ​​are applied to the secondary circuit of the protection system, simulating the standard operating conditions. The secondary current sampling data and differential current data results of the same channel are checked again to ensure that the protection device and the transmission channel can also operate normally under rated conditions. Through these two steps, the performance of the protection channel can be evaluated more meticulously and comprehensively from the perspective of different operating conditions, ensuring its accurate and reliable operation under various current conditions and providing strong protection for the safety and stability of the transmission line.

[0079] In a further embodiment, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line also include: uniqueness of the pressure plate;

[0080] Under normal conditions, different operating conditions are simulated on the pressure plates on either side of the transmission line. Based on the feedback data from the protection pressure plates on the other side of the transmission line, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including:

[0081] For any normal fiber optic channel, remove the pressure plate of the normal channel on either side and check if the other side shows that the pressure plate on the other side has been removed or that the normal channel has been removed. If not, check the pressure plate wiring and provide feedback on any problems found. If correct, then the corresponding static characteristics are considered to be correct.

[0082] In this embodiment, the uniqueness of the pressure plate is considered in the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line, further improving the consideration of the static performance of the protection channel. When the channel is in normal working condition, different operating conditions are simulated for the pressure plate on either side of the channel. This is a prerequisite for checking the uniqueness of the pressure plate, because only by performing the simulation operation when the channel is normal can the relevant characteristics of the pressure plate be accurately judged. Specifically, for any normal fiber optic channel, the pressure plate of the channel is removed on either side, and then it is observed whether the other side of the channel can correctly display the status of the pressure plate being removed or the normal channel being removed. The purpose of this is to verify the accurate transmission of pressure plate status information between the two protection devices. If the other side does not display correctly, it means that there is a problem with the transmission of pressure plate status information. At this time, it is necessary to check whether there is a fault in the pressure plate wiring, and to process the problems found to repair possible wiring errors. If the other side can display correctly, it can be determined that the protection channel is correct in terms of the static characteristic of pressure plate uniqueness. This checking process ensures the accurate interaction of pressure plate status information in the protection channel, which is of great significance for ensuring the normal operation logic of the protection device and the reliability of the entire transmission line protection system.

[0083] In a further embodiment, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line also include: channel uniqueness;

[0084] Under normal conditions, different operating conditions are simulated on the pressure plates on either side of the transmission line. Based on the feedback data from the protection pressure plates on the other side of the transmission line, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including:

[0085] For any normal fiber optic channel, disconnect the pigtail of the normal channel on the opposite side and check if the normal channel data is displayed on this side. If not, check the channel wiring and provide feedback on any problems found. If correct, then the corresponding static characteristics are considered to be correct.

[0086] In this embodiment, the uniqueness of the channel is added to the static characteristics of the longitudinal current differential protection channels on both sides of the transmission line, making the detection of the static performance of the protection channels more comprehensive and detailed. When the channel is in normal working condition, different working conditions are simulated by pressing the pressure plate on either side of the channel, creating a reliable prerequisite for checking the uniqueness of the channel and avoiding interference from channel faults. The specific inspection operation is to disconnect the pigtail of any normal fiber optic channel on the opposite side to simulate a channel connection interruption. Then, it is checked whether the data of the normal channel is still displayed on this side. The purpose is to verify whether this side can accurately sense and correctly reflect when the connection of the opposite channel is abnormal, that is, to judge the uniqueness and accuracy of information transmission between the two channels. If the channel data is not displayed on this side, it means that the channel information transmission is normal under this simulated abnormal condition, and the channel uniqueness can be preliminarily considered to be good; if the channel data is still displayed on this side, it indicates that there may be a wiring error or other abnormality in the channel, and further inspection of the channel wiring is required to troubleshoot possible problems and provide feedback on any problems found. Only when the local side can correctly respond to the situation of the channel tail fiber being pulled out can it be determined that the static characteristic of the uniqueness of the corresponding channel is correct. This process plays a key role in ensuring the accuracy and reliability of the information transmission of the longitudinal current differential protection channel on both sides of the transmission line, and can effectively avoid the maloperation of the protection device due to problems such as channel confusion.

[0087] Please see Figure 2 and Figure 3 The following is combined Figure 2 and Figure 3 The process for checking static characteristics is described, including the following four aspects:

[0088] (1) When fiber optic channel one is normal, the current when the secondary current is applied to the protection device on this side is measured. The secondary current sampling data and differential current data of channel one on this side are obtained. The secondary current sampling data and differential current data of the same channel on the other side are obtained. First, the tester adds three different current values ​​to the protection secondary circuit and checks the results. Then, the three rated current values ​​are added and the results are checked.

[0089] Perform a uniqueness check on the pressure plate: If the pressure plate on the opposite side is removed from channel one, this side should correctly display "pressure plate removed" or "channel one removed". Perform a uniqueness check on the channel: If the fiber optic cable for protection channel one on this side is disconnected, this side should not display data for channel one on the opposite side, indicating a correct result.

[0090] (2) When fiber optic channel two is normal, the current when the secondary current is applied to the protection device on this side is measured. The secondary current sampling data and differential current data of channel two on this side are obtained. The secondary current sampling data and differential current data of the same channel are obtained on the other side. First, the tester adds three different current values ​​to the protection secondary circuit and checks the results. Then, the three-phase rated current values ​​are added and the results are checked.

[0091] Perform a pressure plate uniqueness check: Withdraw the pressure plate of channel two on the opposite side; this side correctly displays "pressure plate withdrawn" or "channel two withdrawn". Perform a channel uniqueness check: Disconnect the fiber optic cable of protection channel two on this side; this side does not display data for channel two on the opposite side, indicating a correct result.

[0092] (3) When fiber optic channel one is normal, the current when the secondary current is applied to the protection device on the other side is measured. The secondary current sampling data and differential current data of channel one are obtained, and the secondary current sampling data and differential current data of the same channel are obtained on this side. First, the tester adds three different current values ​​to the protection secondary circuit and checks the results. Then, the three-phase rated current values ​​are added and the results are checked.

[0093] Perform a uniqueness check on the pressure plate: If the pressure plate of channel one is removed on this side, the opposite side should display either "pressure plate removed" or "channel one removed". Perform a uniqueness check on the channel: If the fiber optic cable of channel one on the opposite side is disconnected, and the data for channel one on this side is not displayed, the result is correct.

[0094] (4) When fiber optic channel two is normal, the current when the secondary current is applied to the protection device on the opposite side is measured. The secondary current sampling data and differential current data of channel two are obtained, and the secondary current sampling data and differential current data of the same channel are obtained on this side. First, the tester adds three different current values ​​to the protection secondary circuit and checks the results. Then, the three-phase rated current values ​​are added and the results are checked.

[0095] Perform a pressure plate uniqueness check: If the pressure plate of channel two is removed on this side, the opposite side should display either "pressure plate removed" or "channel two removed". Perform a channel uniqueness check: If the fiber optic cable of channel two on the opposite side is disconnected, and no data for channel two is displayed on this side, the result is correct.

[0096] In a further embodiment, the dynamic behavior refers to the actions of the protection systems on both sides under different fault conditions;

[0097] The line protection device channels were jointly tested and adjusted, and the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line was checked based on the protection operation on both sides of the line, including:

[0098] For any normal fiber optic channel, ensure that the main protection pressure plates on both sides of the channel are engaged. If they are not engaged, neither side of the protection will activate.

[0099] When the switch on this side is in the closed position, the following checks are performed:

[0100] If the switch on the opposite side is in the open position, and a three-phase fault is simulated on this side, check whether the protection on this side achieves three-phase tripping and whether the protection on the opposite side does not operate. If so, the judgment is correct. If a single-phase fault is simulated on this side, check whether the protection on this side trips only and whether the protection on the opposite side does not operate. If so, the judgment is correct.

[0101] If the switch on the opposite side is in the closed position and the TV (Voltage Transformer) is disconnected, simulate a three-phase fault on this side and check whether the protection on this side trips three times and whether the protection on the opposite side trips three times. If so, the judgment is correct. Simulate a single-phase fault on this side and check whether the protection on this side trips only once and whether the protection on the opposite side trips only once. If so, the judgment is correct.

[0102] If the switch on the opposite side is closed and the voltage transformer TV is normal, simulate a three-phase fault on this side and check whether the protection on this side does not operate and whether the protection on the opposite side does not operate. If so, the judgment is correct. Simulate a single-phase fault on this side and check whether the protection on this side does not operate and whether the protection on the opposite side does not operate. If so, the judgment is correct.

[0103] If the switch on the opposite side is in the closed position, the voltage transformer induced voltage is lower than 65% of the rated voltage and the voltage transformer TV is not disconnected, simulate a three-phase fault on this side, check if the protection on this side trips three times and if the protection on the opposite side trips three times. If so, the judgment is correct. Simulate a single-phase fault on this side, check if the protection on this side trips only once and if the protection on the opposite side trips only once. If so, the judgment is correct.

[0104] If the switch on the opposite side is in the closed position and the protection is activated, this side simulates the operation of a TJR (Trip Jack Relay) to check whether the switch on this side trips three times and whether the protection on the opposite side trips three times. If so, the judgment is correct.

[0105] In this embodiment, the operation of the protection devices on both sides under different fault conditions is used as the standard for measuring dynamic behavior. During inspection, the first step is to conduct joint debugging of the line protection device channels to create conditions for subsequent inspections. For any normal fiber optic channel, ensure that the pressure plates of the main protection devices on both sides are engaged; if not engaged, neither protection device will operate. This is the fundamental prerequisite for subsequent inspections. When the switch on this side is in the closed position, inspections are conducted under various operating conditions. When the opposite switch is in the open position, simulate a three-phase or single-phase fault on this side and check the operation of the protection on this side (three-phase fault, three-phase trip; single-phase fault, single-phase trip) and whether the protection on the opposite side does not operate. If this is the case, the judgment is correct. When the opposite switch is in the closed position and the voltage transformer TV is disconnected, simulate a three-phase or single-phase fault on this side and check whether the protection on both sides trips synchronously (three-phase trip or single-phase trip). If this is the case, the judgment is correct. When the opposite switch is in the closed position and the voltage transformer TV is normal, simulate a fault on this side and check whether the protection on both sides does not operate. If this is the case, the judgment is correct. When the opposite switch is in the closed position and the voltage transformer induced voltage is lower than 65% of the rated voltage but the TV is not disconnected, simulate a fault on this side and check whether the protection on both sides trips synchronously (three-phase trip or single-phase trip). If this is the case, the judgment is correct. When the opposite switch is in the closed position and the protection is activated, simulate the operation of the trip relay TJR on this side and check the three-phase trip of the switch on this side and the three-phase trip of the protection on the opposite side. If this is the case, the judgment is correct. Through simulation and inspection under various operating conditions, the dynamic response capability of the protection channel under different fault scenarios can be comprehensively and meticulously evaluated, ensuring that the longitudinal current differential protection system operates reliably and accurately in actual operation.

[0106] Please see Figure 2 and Figure 4 The following is combined Figure 2 and Figure 4 The process for inspecting dynamic behavior is introduced.

[0107] When the fiber optic channel is normal, the switch on this side is in the closed position. Simulate a fault on this side under different conditions of the switch on the opposite side and the bus voltage, and observe the operation of the protection systems on both sides. Both main protection channels must have their pressure plates engaged; otherwise, neither protection system will operate.

[0108] When the switch on the opposite side is in the open position, a three-phase fault is simulated on this side, and the protection on this side trips three times while the protection on the opposite side does not operate. The result is correct. When a single-phase fault is simulated on this side, the protection on this side trips only once while the protection on the opposite side does not operate. The result is correct.

[0109] When the switch on the opposite side is in the closed position and the TV is disconnected, a three-phase fault is simulated on this side, and the protection on this side trips three times, as does the protection on the opposite side, which is correct. When a single-phase fault is simulated on this side, the protection on this side trips only once, as does the protection on the opposite side, which is correct.

[0110] When the switch on the opposite side is closed and TV is normal, a three-phase fault is simulated on this side. The protection on this side does not operate, and the protection on the opposite side does not operate. The result is correct. When a single-phase fault is simulated on this side, the protection on this side does not operate, and the protection on the opposite side does not operate. The result is correct.

[0111] When the switch on the opposite side is closed, TV is below 65%Un, and TV is not disconnected (weak feeder function), a three-phase fault is simulated on this side, and the protection on this side trips three times, and the protection on the opposite side trips three times, which is correct; when a single-phase fault is simulated on this side, the protection on this side trips only once, and the protection on the opposite side trips only once, which is correct.

[0112] With the switch on the opposite side in the closed position, the protection is activated. The TJR on this side is simulated to operate. The switch on this side trips three times, and the protection on the opposite side trips three times. The result is correct.

[0113] Note: The above example uses Channel 1. The testing and acceptance of Channel 2 should be performed in accordance with the above procedures. The above content takes the case where the switch on this side is in the closed position as an example. When the switch on the opposite side is in the closed position, and the voltage of the switch on this side and the busbar are under different conditions, a fault is simulated on the opposite side, and the operation of the protection on both sides is observed. The operation should be performed in accordance with the above procedures, and the operation should be consistent with the above.

[0114] In a further embodiment, acquiring fiber optic data for dual-channel transmission line protection, electrical quantity data on both sides of the line, protection device version number, and protection pressure plate data specifically includes:

[0115] Acquire the optical power of each node in the dual-channel line protection system of the substation, the current transformer ratio on both sides of the line under test, the protection device version number, secondary current data, secondary voltage data, protection pressure plate and channel optical fiber.

[0116] In this embodiment, the optical power of each node in the dual-channel protection system of the substation is acquired. This is crucial for evaluating the transmission performance of the fiber optic channel, as the magnitude and stability of the optical power directly affect the signal transmission quality. The transformation ratio of the current transformers on both sides of the line under test is also acquired; this data is an important basis for calculating electrical quantities and determining the operational logic of the protection device. Obtaining the version number of the protection device helps clarify its functional characteristics and technical parameters, as different versions may have performance differences. Secondary current and secondary voltage data reflect the actual electrical operating state of the line and are core data for determining whether the protection device is operating correctly. The status of the protection pressure plate determines whether some functions of the protection device are enabled, directly affecting the normal operation of the protection system. Acquiring information related to the fiber optic channel provides insight into its physical state. By comprehensively acquiring this data, a detailed and accurate data foundation is provided for subsequent operations such as judging the channel status based on fiber optic data, simulating the operating conditions of the protection device, and evaluating the static and dynamic characteristics of the protection channel. This ensures the effectiveness and reliability of the entire longitudinal current differential protection commissioning and acceptance process.

[0117] Furthermore, in some other embodiments of the present invention, an LED touchscreen is used to provide an editable interface to the user, through which input substation information is received. This substation information includes at least: the substation identifier of the bay to be tested, the version number of the protection device for the bay to be tested, and the protection winding ratio. Additionally, after the upgrade report is completed, the substation line longitudinal differential protection commissioning and acceptance report can be printed according to printing requirements.

[0118] This invention solves the technical problems of current testing methods, which require numerous instruments such as relay protection testers, optical power meters, and multimeters, and involve subjective decisions by personnel regarding acceptance procedures, manual recording and analysis of acceptance results, resulting in low testing efficiency. This invention proposes a substation longitudinal differential protection commissioning and acceptance method, applied to the commissioning of longitudinal current differential protection channels on both sides of transmission lines. It can directly obtain relevant data from the substation's acceptance bays, standardize the acceptance process, perform evaluation and analysis based on the data, and automatically generate a substation longitudinal differential protection commissioning and acceptance report. By displaying the acceptance report, the method automates the substation longitudinal differential protection commissioning and acceptance process, improves acceptance efficiency, and ensures that the longitudinal differential protection can be quickly put into use.

[0119] Based on the same inventive concept, this application also provides a line longitudinal current differential protection commissioning and acceptance device for implementing the above-mentioned line longitudinal current differential protection commissioning and acceptance method. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations in the embodiments of the line longitudinal current differential protection commissioning and acceptance device provided below can be found in the limitations of the line longitudinal current differential protection commissioning and acceptance method above, and will not be repeated here.

[0120] Please see Figure 5 This invention also provides a line longitudinal current differential protection commissioning and acceptance device, applied to the commissioning of longitudinal current differential protection channels on both sides of a transmission line, comprising:

[0121] Data input module, data analysis module, and data display module;

[0122] The data input module is used to acquire and input the fiber optic data of the dual-channel transmission line protection, the electrical quantity data of both sides of the line, the protection device version number, and the protection pressure plate data;

[0123] The data analysis module is used to determine whether the fiber optic channel is working properly based on fiber optic data. Under normal channel conditions, it simulates different operating conditions for the protection devices and pressure plates on either side of the channel. Based on the feedback from the electrical quantity data and protection pressure plate data on the other side of the channel, it checks the static characteristics of the longitudinal current differential protection channels on both sides of the transmission line. It is also used to perform joint commissioning of the line protection device channels when the status checks of the longitudinal current differential protection channels on both sides of the transmission line are correct, and to check the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line based on the protection actions on both sides. Finally, it generates a joint commissioning and acceptance report for the longitudinal current differential protection with the protection device version number based on the static characteristic check results and dynamic behavior check results of the longitudinal current differential protection channels on both sides of the transmission line.

[0124] The data display module is used to display the commissioning and acceptance report of the longitudinal current differential protection.

[0125] Furthermore, a data printing module can be set up to receive printing instructions from the data display module and print the commissioning and acceptance report of the substation line longitudinal differential protection.

[0126] Furthermore, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line include: the protection device and the channel status;

[0127] Under normal conditions, different operating conditions are simulated for the protection devices on either side of the transmission line. Based on the feedback of electrical quantity data from the other side of the transmission line, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including:

[0128] For any normal fiber optic channel, a secondary current is applied to the protection device on either side of the normal channel, and the secondary current sampling data and differential current data of the channel on the side where the current is applied, as well as the secondary current sampling data and differential current data of the same channel on the opposite side, are obtained as feedback data.

[0129] Check whether the feedback data results on both sides are correct. If they are incorrect, check the device settings, protection channel status and current loop wiring, and process the problems found. If they are correct, determine that the corresponding static characteristics are correct.

[0130] Furthermore, a secondary current is applied to the protection device on either side of the channel, and the feedback data from both sides is acquired and checked for accuracy, including:

[0131] Apply three different current values ​​to the secondary circuit of the protection and check whether the secondary current sampling data and differential current data of the same channel on this side and the opposite side are correct.

[0132] Add the three-phase rated current value to the secondary circuit of the protection system, and then check again whether the secondary current sampling data and differential current data obtained from the same channel on this side and the opposite side are correct.

[0133] Furthermore, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line also include: the uniqueness of the pressure plate;

[0134] Under normal conditions, different operating conditions are simulated on the pressure plates on either side of the transmission line. Based on the feedback data from the protection pressure plates on the other side of the transmission line, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including:

[0135] For any normal fiber optic channel, remove the pressure plate of the normal channel on either side and check if the other side shows that the pressure plate on the other side has been removed or that the normal channel has been removed. If not, check the pressure plate wiring and provide feedback on any problems found. If correct, then the corresponding static characteristics are considered to be correct.

[0136] Furthermore, the static characteristics of the longitudinal current differential protection channels on both sides of the transmission line also include: channel uniqueness;

[0137] Under normal conditions, different operating conditions are simulated on the pressure plates on either side of the transmission line. Based on the feedback data from the protection pressure plates on the other side of the transmission line, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including:

[0138] For any normal fiber optic channel, disconnect the pigtail of the normal channel on the opposite side and check if the normal channel data is displayed on this side. If not, check the channel wiring and provide feedback on any problems found. If correct, then the corresponding static characteristics are considered to be correct.

[0139] Furthermore, dynamic behavior refers to the actions of the protection systems on both sides under different fault conditions;

[0140] The line protection device channels were jointly tested and adjusted, and the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line was checked based on the protection operation on both sides of the line, including:

[0141] For any normal fiber optic channel, ensure that the main protection pressure plates on both sides of the channel are engaged. If they are not engaged, neither side of the protection will activate.

[0142] When the switch on this side is in the closed position, the following checks are performed:

[0143] If the switch on the opposite side is in the open position, and a three-phase fault is simulated on this side, check whether the protection on this side achieves three-phase tripping and whether the protection on the opposite side does not operate. If so, the judgment is correct. If a single-phase fault is simulated on this side, check whether the protection on this side trips only and whether the protection on the opposite side does not operate. If so, the judgment is correct.

[0144] If the switch on the opposite side is in the closed position and the voltage transformer TV is disconnected, a three-phase fault is simulated on this side. Check if the protection on this side trips three times and if the protection on the opposite side trips three times. If so, the judgment is correct. If a single-phase fault is simulated on this side, check if the protection on this side trips only once and if the protection on the opposite side trips only once. If so, the judgment is correct.

[0145] If the switch on the opposite side is closed and the voltage transformer TV is normal, simulate a three-phase fault on this side and check whether the protection on this side does not operate and whether the protection on the opposite side does not operate. If so, the judgment is correct. Simulate a single-phase fault on this side and check whether the protection on this side does not operate and whether the protection on the opposite side does not operate. If so, the judgment is correct.

[0146] If the switch on the opposite side is in the closed position, the voltage transformer induced voltage is lower than 65% of the rated voltage and the voltage transformer TV is not disconnected, simulate a three-phase fault on this side, check if the protection on this side trips three times and if the protection on the opposite side trips three times. If so, the judgment is correct. Simulate a single-phase fault on this side, check if the protection on this side trips only once and if the protection on the opposite side trips only once. If so, the judgment is correct.

[0147] If the switch on the opposite side is in the closed position and the protection is activated, the simulated trip relay TJR on this side will operate. Check whether the switch on this side trips three times and whether the protection on the opposite side trips three times. If so, the judgment is correct.

[0148] Furthermore, acquiring fiber optic data for dual-channel transmission line protection, electrical quantity data on both sides of the line, protection device version number, and protection pressure plate data specifically includes:

[0149] Acquire the optical power of each node in the dual-channel line protection system of the substation, the current transformer ratio on both sides of the line under test, the protection device version number, secondary current data, secondary voltage data, protection pressure plate and channel optical fiber.

[0150] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0151] Reference Figure 6The present invention also provides a computer device, including: a memory and a processor, and a computer program stored in the memory. When the computer program is executed on the processor, it implements the line longitudinal current differential protection commissioning and acceptance method as described in any of the above methods.

[0152] The computer device may be a desktop computer, laptop, handheld computer, or cloud server, etc. This computer device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that... Figure 6 The examples of computer devices are merely examples and do not constitute a limitation on computer devices. They may include more or fewer components than shown in the illustration, or combinations of certain components, or different components. For example, they may also include input / output devices, network access devices, etc.

[0153] The processor referred to can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0154] In some embodiments, the memory may be an internal storage unit of the computer device, such as a hard drive or RAM. In other embodiments, the memory may be an external storage device of the computer device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory may include both internal and external storage units of the computer device. The memory is used to store the operating system, applications, bootloader, data, and other programs, such as the program code of the computer program. The memory can also be used to temporarily store data that has been output or will be output.

[0155] This invention also provides a computer-readable storage medium storing a computer program thereon. When the computer program is run by a processor, it implements the line longitudinal current differential protection commissioning and acceptance method as described in any of the above methods.

[0156] In this embodiment, if the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to a photographing device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0157] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0158] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0159] In the embodiments disclosed in this application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0160] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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. Such 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 method for commissioning and accepting longitudinal current differential protection of a transmission line, applied to the commissioning of longitudinal current differential protection channels on both sides of a transmission line, characterized in that... Includes the following steps: Acquire fiber optic data for dual-channel transmission line protection, electrical quantity data on both sides of the line, protection device version number, and protection pressure plate data; Based on the fiber optic data, determine whether the fiber optic channel is working properly. Under normal channel conditions, simulate different working conditions for the protection device and pressure plate on either side of the channel. Based on the feedback of the electrical quantity data and the protection pressure plate data on the other side of the channel, check the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line. If the status checks of the longitudinal current differential protection channels on both sides of the transmission line are correct, the protection device channels of the line are jointly debugged, and the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line is checked according to the protection action on both sides of the line. Based on the static characteristic inspection results and dynamic behavior inspection results of the longitudinal current differential protection channels on both sides of the transmission line, a joint commissioning and acceptance report for the longitudinal current differential protection version number of the protection device is generated.

2. The method for commissioning and acceptance of longitudinal current differential protection for lines according to claim 1, characterized in that, The static characteristics of the longitudinal current differential protection channel on both sides of the transmission line include: the protection device and the channel status; Under normal conditions, different operating conditions are simulated for the protection devices on either side of the transmission line. Based on the feedback of the electrical quantity data from the other side of the transmission line, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including: For any normal fiber optic channel, a secondary current is applied to the protection device on either side of the normal channel, and the secondary current sampling data and differential current data of the channel on the side where the current is applied, as well as the secondary current sampling data and differential current data of the same channel on the opposite side, are obtained as feedback data. Check whether the feedback data results on both sides are correct. If they are incorrect, check the device settings, protection channel status and current loop wiring, and process the problems found. If they are correct, determine that the corresponding static characteristics are correct.

3. The method for commissioning and acceptance of longitudinal current differential protection for lines according to claim 2, characterized in that, A secondary current is applied to the protection device on either side of the channel, and the feedback data results from both sides are acquired and checked for correctness, including: Three different current values ​​are applied to the secondary circuit of the protection system, and the results of the secondary current sampling data and differential current data obtained from the same channel on this side and the opposite side are checked to see if they are correct. Apply the three-phase rated current value to the secondary circuit of the protection system, and then check again whether the secondary current sampling data and differential current data obtained from the same channel on this side and the opposite side are correct.

4. The method for commissioning and acceptance of longitudinal current differential protection for lines according to claim 2, characterized in that, The static characteristics of the longitudinal current differential protection channel on both sides of the transmission line also include: the uniqueness of the pressure plate; Under normal channel conditions, different operating conditions are simulated on the pressure plates on either side of the channel. Based on the feedback data from the protection pressure plates on the other side of the channel, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including: For any normal fiber optic channel, remove the normal channel pressure plate on either side and check if the other side displays "pressure plate removed" or "normal channel removed". If not, check the pressure plate wiring and provide feedback on any problems found. If correct, then the corresponding static characteristics are considered correct.

5. The method for commissioning and acceptance of longitudinal current differential protection for lines according to claim 4, characterized in that, The static characteristics of the longitudinal current differential protection channel on both sides of the transmission line also include: channel uniqueness; Under normal channel conditions, different operating conditions are simulated on the pressure plates on either side of the channel. Based on the feedback data from the protection pressure plates on the other side of the channel, the static characteristics of the longitudinal current differential protection channel on both sides of the transmission line are checked, including: For any normal fiber optic channel, disconnect the pigtail of the normal channel on the opposite side and check if the data of the normal channel is displayed on this side. If not, check the channel wiring and provide feedback on any problems found. If correct, then the corresponding static characteristics are determined to be correct.

6. The method for commissioning and acceptance of longitudinal current differential protection for lines according to claim 1, characterized in that, The dynamic behavior refers to the actions of the protection systems on both sides under different fault conditions; The line protection device channels were jointly tested and adjusted, and the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line was checked based on the protection operation on both sides of the line, including: For any normal fiber optic channel, ensure that the main protection pressure plates on both sides of the channel are engaged. If they are not engaged, neither side of the protection will activate. When the switch on this side is in the closed position, the following checks are performed: If the switch on the opposite side is in the open position, and a three-phase fault is simulated on this side, check whether the protection on this side achieves three-phase tripping and whether the protection on the opposite side does not operate. If so, the judgment is correct. If a single-phase fault is simulated on this side, check whether the protection on this side trips only and whether the protection on the opposite side does not operate. If so, the judgment is correct. If the switch on the opposite side is in the closed position and the voltage transformer TV is disconnected, a three-phase fault is simulated on this side. Check if the protection on this side trips three times and if the protection on the opposite side trips three times. If so, the judgment is correct. If a single-phase fault is simulated on this side, check if the protection on this side trips only once and if the protection on the opposite side trips only once. If so, the judgment is correct. If the switch on the opposite side is closed and the voltage transformer TV is normal, simulate a three-phase fault on this side and check whether the protection on this side does not operate and whether the protection on the opposite side does not operate. If so, the judgment is correct. Simulate a single-phase fault on this side and check whether the protection on this side does not operate and whether the protection on the opposite side does not operate. If so, the judgment is correct. If the switch on the opposite side is in the closed position, the voltage transformer induced voltage is lower than 65% of the rated voltage and the voltage transformer TV is not disconnected, simulate a three-phase fault on this side, check if the protection on this side trips three times and if the protection on the opposite side trips three times. If so, the judgment is correct. Simulate a single-phase fault on this side, check if the protection on this side trips only once and if the protection on the opposite side trips only once. If so, the judgment is correct. If the switch on the opposite side is in the closed position and the protection is activated, the simulated trip relay TJR on this side will operate. Check whether the switch on this side trips three times and whether the protection on the opposite side trips three times. If so, the judgment is correct.

7. The method for commissioning and acceptance of longitudinal current differential protection for lines according to claim 1, characterized in that, Acquire fiber optic data for dual-channel transmission line protection, electrical quantity data on both sides of the line, protection device version number, and protection pressure plate data, specifically including: Acquire the optical power of each node in the dual-channel line protection system of the substation, the current transformer ratio on both sides of the line under test, the protection device version number, secondary current data, secondary voltage data, protection pressure plate and channel optical fiber.

8. A line longitudinal current differential protection commissioning and acceptance device, applied to the commissioning of longitudinal current differential protection channels on both sides of a transmission line, characterized in that, include: Data input module, data analysis module, and data display module; The data input module is used to acquire and input the fiber optic data of the dual-channel transmission line protection, the electrical quantity data of both sides of the line, the protection device version number, and the protection pressure plate data; The data analysis module is used to determine whether the optical fiber channel is working properly based on the optical fiber data. Under normal channel conditions, it simulates different operating conditions for the protection devices and pressure plates on either side of the channel. Based on the feedback from the electrical quantity data and the protection pressure plate data on the other side of the channel, it checks the static characteristics of the longitudinal current differential protection channels on both sides of the transmission line. It is also used to perform joint commissioning on the line protection device channels when the status checks of the longitudinal current differential protection channels on both sides of the transmission line are correct, and to check the dynamic behavior of the longitudinal current differential protection channels on both sides of the transmission line based on the protection actions on both sides. Furthermore, it is used to generate a joint commissioning acceptance report for the longitudinal current differential protection with the protection device version number based on the static characteristic check results and dynamic behavior check results of the longitudinal current differential protection channels on both sides of the transmission line. The data display module is used to display the joint commissioning and acceptance report of the longitudinal current differential protection.

9. A computer device, characterized in that, The device includes a processor and a memory: The memory is used to store computer programs and send the instructions of the computer programs to the processor; The processor executes, according to the instructions of the computer program, a method for commissioning and acceptance of line longitudinal current differential protection as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements a method for commissioning and acceptance of line longitudinal current differential protection as described in any one of claims 1-7.

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