Line differential protection method, device, system and readable storage medium

Abstract

The application discloses a line differential protection method, which comprises the following steps: receiving, by a local side in a line, opposite-side current data and opposite-side switch data transmitted by 5G communication after detecting a fault signal and performing a whole-group start; wherein the opposite-side switch data comprises PT state switch data and CT state switch data; judging whether the opposite side meets a differential permission condition according to the opposite-side switch data; if the opposite side meets the differential permission condition, performing differential operation; and when an operation result of the differential operation meets a differential action condition, performing differential action. In the application, the current data and the switch data are transmitted between the opposite side and the local side by 5G communication, the differential permission condition is judged locally, the number of times of data transmission between the local side and the opposite side is reduced to a certain extent, the speed of differential action is ensured, and the safety of line operation is improved. The application also provides a line differential protection device, a line differential protection system and a computer readable storage medium.

Description

Technical Field

[0001] This invention relates to the field of line differential protection technology, and in particular to a line differential protection method, apparatus, system, and computer-readable storage medium. Background Technology

[0002] Differential protection operates based on Kirchhoff's current theorem, the fundamental principle of which is that the sum of the currents flowing into a node in a circuit equals zero. Differential protection treats the protected electrical equipment as a node; under normal conditions, the current flowing into the protected equipment equals the current flowing out, resulting in a zero differential current. When a fault occurs, the current flowing into and out of the protected equipment becomes unequal, and the differential current becomes greater than zero. When the differential current exceeds the setting value of the differential protection device, the host computer alarm and protection output activates, tripping the circuit breakers on each side of the protected equipment and disconnecting the power supply to the faulty equipment.

[0003] Line differential protection is a type of differential protection, typically referring to longitudinal protection of transmission lines. It involves connecting protection devices at both ends of the transmission line longitudinally via a communication channel. Through data exchange and comparison between the protection devices, it determines whether the fault is within or outside the line's range, thus deciding whether to disconnect the protected line. Because faulty lines, especially high-voltage lines, must be disconnected immediately upon fault occurrence to avoid serious safety hazards to the entire high-voltage line, ensuring the timely execution of differential actions is a key concern in line differential protection. Summary of the Invention

[0004] The purpose of this invention is to provide a line differential protection method, device, system, and computer-readable storage medium, which can improve the speed of differential protection and enhance line safety to a certain extent.

[0005] To solve the above-mentioned technical problems, the present invention provides a line differential protection method, comprising:

[0006] The local side of the line receives the current data and switching data of the opposite side transmitted via 5G communication after the opposite side detects a fault signal and starts the entire unit; wherein, the switching data of the opposite side includes at least PT status switching data and CT status switching data.

[0007] Based on the opposite side current data and the opposite side switch data, determine whether the opposite side meets the differential allowable conditions. If the opposite side meets the differential allowable conditions, then perform differential operation.

[0008] If the result of the differential operation satisfies the differential action condition, then the differential action is performed.

[0009] Optionally, determining whether the differential allowable conditions are met based on the opposite side current data and the opposite side switching data includes:

[0010] Determine whether the differential equation is satisfied between the current data collected most recently on the opposite side and the local current data on the local side. If so, determine whether the opposite side satisfies at least one of the following: opposite side current sudden change, opposite side jump, opposite side voltage recovery and PT not disconnected. If so, the opposite side satisfies the differential allowable condition.

[0011] Optionally, the differential operation process includes:

[0012] Differential equation calculations are performed on the local side current data and the opposite side current data within a preset time period;

[0013] If both the local current data and the opposite current data satisfy the differential equation within the preset time period, then the differential action condition is met.

[0014] Optionally, when no fault signal is detected on either the local side or the opposite side, the local side and the opposite side transmit current data to each other according to a predetermined cycle.

[0015] When the local side detects a sudden change in either the local side voltage or the local side current, the local side detects the fault signal.

[0016] Optionally, when the local side detects the fault signal, it sends local side current data and local side switching data to the opposite side.

[0017] A line differential protection device, comprising:

[0018] The data transmission module is used to receive, on the local side of the line, the current data and switching data transmitted by the opposite side of the line via 5G communication after the opposite side detects a fault signal and starts the entire unit; wherein, the switching data of the opposite side includes PT status switching data and CT status switching data.

[0019] The differential enable module is used to determine whether the opposite side meets the differential enable conditions based on the opposite side current data and the opposite side switch quantity data. If the opposite side meets the differential enable conditions, differential operation is performed.

[0020] The differential operation module is used to perform a differential operation when the result of the differential operation meets the differential operation conditions.

[0021] Optionally, the differential allow module is specifically used to determine whether the differential equation is satisfied between the current data collected most recently on the opposite side and the local current data on the local side. If so, it determines whether the opposite side satisfies at least one of the following: opposite side current sudden change, opposite side jump, opposite side voltage recovery and PT not disconnected. If so, the opposite side satisfies the differential allow condition.

[0022] Optionally, the data transmission module is further configured to transmit current data to each other at a predetermined period when neither the local side nor the opposite side detects a fault signal;

[0023] It also includes a fault detection module, which is used to detect the fault signal on the local side when either the local side voltage or the local side current is detected on the local side.

[0024] A line differential protection system includes: a local side and an opposite side located on both sides of a line; wherein the local side and the opposite side are connected via 5G communication.

[0025] Data is transmitted between the local side and the opposite side via the 5G communication to implement the steps of the line differential protection method as described above.

[0026] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the line differential protection method as described in any of the preceding claims.

[0027] The present invention provides a line differential protection method, comprising receiving, via 5G communication, current data and switching data of the opposite side after the opposite side detects a fault signal and starts the entire system, at the local side of the line; wherein, the switching data of the opposite side includes PT status switching data and CT status switching data; determining whether the opposite side meets the differential allowable conditions based on the opposite side current data and the opposite side switching data; if the opposite side meets the differential allowable conditions, performing differential calculation; and performing differential action when the result of the differential calculation meets the differential action conditions.

[0028] This application utilizes 5G communication to transmit current data between the local and remote sides. In addition, it also transmits switching data from the remote side. This allows the local side to determine on-site whether the remote side meets the differential protection conditions when deciding whether differential action is required. This eliminates the need for the remote side to determine the differential protection conditions before sending them back to the local side, thus avoiding excessive data exchange between the local and remote sides after a fault is detected. This results in longer differential action delays and affects the timeliness of differential protection. Therefore, this application can reduce the number of data transmissions between the local and remote sides after a fault is detected and before differential action, thereby reducing the differential action delay caused by round-trip data transmission, ensuring timely differential action, and improving the safety of line operation.

[0029] This application also provides a line differential protection device, system, and computer-readable storage medium. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of 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.

[0031] Figure 1 This is a timing diagram of the operation of line differential protection in the prior art;

[0032] Figure 2 A schematic flowchart of the line differential protection method provided in the embodiments of this application;

[0033] Figure 3 A timing diagram of the line differential protection process provided in an embodiment of this application;

[0034] Figure 4 This is a logical diagram illustrating a differential allowance condition judgment.

[0035] Figure 5 This is a structural block diagram of a line differential protection device provided in an embodiment of the present invention. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] refer to Figure 1 , Figure 1 This is a timing diagram illustrating the operation of differential line protection in existing technology. Figure 1 Taking a double-sided line as an example, protection devices are installed on both sides of the line. Let's take the M side and N side as examples of the protection devices on both sides of the line. When the M side senses a fault at time t0, after a time delay of T0, the entire protection system is activated, and current data is sent to the N side at time t1. The N side also experiences a time delay of T1 when receiving this current data, and receives it at time t2. After receiving the current data, the N side needs to combine its own data to determine the differential protection conditions. If the differential protection conditions are met, it sends a permission signal to the M side. This differential protection condition determination by the N side takes time T2 to complete. Therefore, the N side needs to send a permission signal to the M side at time t3. This permission signal also takes time T3 to reach the M side, and the N side receives the permission signal at time t4. After receiving the permission signal, the M side needs to combine the current data from the M side and the N side again to perform differential calculations. When the differential action calculation result meets the differential conditions, the differential protection is activated at time t5.

[0038] based on Figure 1 As shown in the timing diagram, in conventional line differential protection, at least two round trips of data transmission are required between the M and N sides. In traditional line differential protection, data transmission between the M and N sides is achieved via optical fiber, thus the data transmission time is not excessive. However, the laying cost of optical fiber is relatively high, while wireless communication has the advantages of low construction cost, easy construction, and flexible expansion compared to wired communication. 5G communication, as a new generation of wireless communication technology, provides the communication foundation for distribution networks to implement line current differential protection based on wireless communication. However, compared to optical fiber communication, 5G communication has characteristics such as large latency jitter and inconsistent bidirectional latency, that is... Figure 1 The delay instability caused by the T1 and T3 time periods increases the speed of the final differential action. In high-voltage lines, the timeliness of differential action directly affects the safety of the line.

[0039] To address this, this application proposes a method that utilizes the characteristic of 5G communication that can transmit signal data in addition to current data. When a fault is detected, the other side can transmit multiple data signals to the local side at once, enabling the local side to directly perform calculations on whether the differential operation conditions have been met without the other side needing to transmit the calculations back. This reduces the number of data transmissions between the other and local sides, thereby reducing the delay caused by data transmission and improving the timeliness of differential operation.

[0040] refer to Figure 2 and Figure 3 , Figure 2 This is a schematic flowchart of the line differential protection method provided in an embodiment of this application. Figure 3 A timing diagram of the line differential protection process provided in this application embodiment. The line differential protection method may include:

[0041] S11: The local side of the line receives the current data and switching data of the opposite side transmitted via 5G communication after the opposite side detects a fault signal and starts the entire group.

[0042] Among them, the switch quantity data of the contralateral side includes at least the switch quantity data of PT status and the switch quantity data of CT status.

[0043] It should be noted that the local side and the opposite side in this application are equivalent to the protection devices on both sides of the line; and the line differential protection method in this application can be applied to single-sided line differential protection as well as double-sided line differential protection. In single-sided line differential protection, the local side in this application mainly refers to the power supply side, while the opposite side refers to the low-voltage side. In double-sided line differential protection, the differential protection process of the protection devices on the local side and the opposite side in this application is the same. The local side can be either side of the line, while the opposite side is the other side of the line besides the local side. In practical applications, the local side and the opposite side are completely equivalent in double-sided line differential protection, which will not be elaborated further in this application.

[0044] In addition, for the sake of explaining the technical solutions in this application, this embodiment focuses on the local side.

[0045] Furthermore, it should be noted that before a fault signal is detected on either side of the line, data transmission also takes place between the local side and the opposite side, mainly transmitting current signals. The difference is that before a fault signal is detected, the frequency of signal transmission between the two sides of the line is relatively low, and current data is transmitted to each other according to a specific time period.

[0046] Therefore, in conventional line differential protection, the detection of line faults is generally achieved by comparing the current difference between the local side and the opposite side of the line. Once the current difference exceeds a certain value, it is considered that differential protection may be required, which means that fault information has been detected.

[0047] However, this fault diagnosis method is obviously limited by the low frequency of the current signals transmitted on both sides of the line, which may lead to problems with untimely fault detection; and for single-sided lines, fault detection is even more impossible on the weak current side.

[0048] Therefore, in the optional embodiments of this application, the differential current is no longer used as the sole basis for judging and identifying faults; instead, the local side voltage or the local side current is used as the basis for identifying fault signals on either side of the line. When a sudden change in either current or voltage is detected on either side of the line, that is, when the change in current or voltage is too large, it is considered that a fault signal has been detected, and the entire group can be started to begin the line differential protection program.

[0049] For embodiments that use sudden changes in local voltage or current as the basis for identifying fault information, it is clear that whether it is a single-sided line or a double-sided line, both sides can obtain the current and voltage of their respective sides. This means that the protection devices on both sides of the line can detect fault signals based on the current and voltage values ​​of their respective sides. Compared with conventional technology where only the power supply side of a single-sided line can detect fault signals and the fault signals need to be identified based on the current differential value, this embodiment can improve the timeliness of fault information identification and overcome the limitation that the weak current side cannot identify fault signals in a single-sided line.

[0050] In practical applications, regardless of which side of the line the fault signal is identified on, the current data and switching data of that side can be sent to the other side of the line.

[0051] S12: Determine whether the differential operation is allowed based on the current data and switching data of the opposite side. If the differential operation is allowed, perform differential operation.

[0052] As mentioned earlier, the contralateral switching data includes at least the PT status switching data and CT status switching data. For each type of contralateral switching data, only two quantities, 0 and 1, are used to represent the corresponding data status.

[0053] Taking the PT status switch data, specifically the switch data indicating whether the PT is open, as an example, when the PT is open, the corresponding switch value can be 0, while when the PT is not open, the corresponding switch value is 1. This allows us to characterize various data indicators on the other side. After receiving the various switch data, the local side can then determine the differential allowance conditions.

[0054] refer to Figure 4 , Figure 4 This is a logic diagram illustrating a differential allowance condition judgment. It can be understood as... Figure 1 The logic for determining whether to send an enable signal is used in the middle.

[0055] In actual calculations, the opposite side can... Figure 4The corresponding switch data of information such as differential protection activation, TWJ and no current, sudden current change start, zero-sequence current start, phase or desired voltage reduction less than 60% and no PT disconnection, minimum phase voltage > 70% of rated phase voltage, zero-sequence voltage with floating threshold greater than 1V, negative-sequence voltage with floating threshold greater than 2V, and PT disconnection are transmitted to the local side, and the current data of the opposite side is also transmitted to the local side.

[0056] Based on the received switching data and current data from the other side, the local side can perform differential equation calculations using the local current data, and determine whether the other side current is greater than four times the local current. The results of these calculations are then combined with the other side switching data according to... Figure 4 The logical judgment shown determines whether the differential operation is allowed. If it is, the next differential operation can be performed.

[0057] Of course, considering the large amount of data involved in determining the differential allowance conditions, this application may also include another calculation method for determining whether the differential allowance conditions are met. That is to say, a simpler differential allowance condition can be used as the basis for determining whether differential operation is allowed.

[0058] In an optional embodiment of this application, the process of determining whether the differential allowance condition is met may include:

[0059] If the differential equation is satisfied between the current data collected at the most recent moment on the opposite side and the local current data on the local side, then it is determined whether the opposite side satisfies at least one of the following conditions: sudden change in opposite side current, opposite side tripping, opposite side re-voltage and PT not disconnected. If so, the opposite side satisfies the differential allowable condition.

[0060] The remote switching data proposed in this embodiment can specifically include remote switching data representing three aspects: remote current surge, remote tripping, and remote voltage recovery with the PT not disconnected. Once the local side receives the remote switching data, it can determine whether the remote side meets any one of the three conditions: remote current surge, remote tripping, or remote voltage recovery with the PT not disconnected. If so, the differential operation is considered to be satisfied.

[0061] S13: If the result of the differential operation satisfies the differential action condition, then the differential action is performed.

[0062] After determining that the differential operation conditions are met, differential operation can be performed. This differential operation still involves checking whether the current between the local and remote sides satisfies the differential equation. However, it is important to emphasize that the calculation of whether the differential equation is satisfied in this step is different from... Figure 4 Whether the differential equation is satisfied or not makes a difference in the calculation. Figure 4The calculation of whether the differential equation is satisfied only considers the local current and the opposite current at a certain moment to satisfy the differential equation. However, this step requires that all local current data and opposite current data collected over a continuous period of time satisfy the differential equation for the calculation result to be considered to meet the differential action condition.

[0063] Based on the above discussion, it can be clearly determined that in the process of line differential protection in this application, there is only one data transmission, that is, the opposite side transmits the opposite side current data and the opposite side switch data to the local side. The judgment of differential permission and the differential calculation are completely completed by the local side, without the need for multiple data transmissions between the local side and the opposite side. This reduces the differential delay time to a certain extent, ensures that the differential action is performed in a timely manner, and thus ensures the safety of the line.

[0064] In summary, the line differential protection proposed in this application fully utilizes the ability of 5G communication to transmit switching data in addition to current data. This enables the differential operation permission condition judgment to be performed locally, without waiting for the other side to make the judgment and then transmitting it wirelessly. As a result, each differential operation does not require multiple data transmissions between the two sides of the line, avoiding the time-consuming problem caused by the delay in wireless communication data transmission for differential operation condition judgment. This significantly shortens the time spent between differential operations, maximizes the speed of differential operation, and thus improves the safety of the line.

[0065] The line differential protection device provided in the embodiments of the present invention will be described below. The line differential protection device described below can be referred to in correspondence with the line differential protection method described above.

[0066] Figure 5 The structural block diagram of the line differential protection device provided in the embodiment of the present invention is shown below. Figure 5 The line differential protection device may include:

[0067] The data transmission module 100 is used to receive, on the local side of the line, the current data and switching data transmitted by the opposite side of the line via 5G communication after the opposite side detects a fault signal and starts the entire unit; wherein, the switching data of the opposite side includes PT status switching data and CT status switching data.

[0068] The differential enable module 200 is used to determine whether the opposite side meets the differential enable conditions based on the opposite side current data and the opposite side switch quantity data. If the opposite side meets the differential enable conditions, differential operation is performed.

[0069] The differential operation module 300 is used to perform a differential operation when the result of the differential operation meets the differential operation conditions.

[0070] In an optional embodiment of this application, the differential allow module 200 is specifically used to determine whether the differential equation is satisfied between the current data collected most recently on the opposite side and the local current data on the local side. If so, it determines whether the opposite side satisfies at least one of the following: opposite side current sudden change, opposite side jump, opposite side voltage recovery and PT not disconnected. If so, the opposite side satisfies the differential allow condition.

[0071] In an optional embodiment of this application, the differential calculation module 300 is specifically used to perform differential equation calculation on the local side current data and the opposite side current data within a preset time period; when both the local side current data and the opposite side current data satisfy the differential equation within the preset time period, the differential action condition is satisfied.

[0072] In an optional embodiment of this application, the data transmission module 100 is further configured to transmit current data to each other at a predetermined period when neither the local side nor the opposite side detects a fault signal;

[0073] It also includes a fault detection module, which is used to detect the fault signal when the local side detects a sudden change in either the local side voltage or the local side current.

[0074] In an optional embodiment of this application, the data transmission module 100 is further configured to send local side current data and local side switching data to the opposite side when the local side detects the fault signal.

[0075] The line differential protection device of this embodiment is used to implement the aforementioned line differential protection method. Therefore, the specific implementation of the line differential protection device can be found in the embodiment section of the line differential protection method above. For example, the data transmission module 100, the differential enabling module 200, and the differential calculation module 300 are used to implement steps S11, S12, and S13 in the above-mentioned line differential protection method, respectively. Therefore, the specific implementation can be referred to the description of the corresponding embodiments, which will not be repeated here.

[0076] This application also discloses a line differential protection system, which includes: a local side and an opposite side located on both sides of the line; wherein the local side and the opposite side are connected via 5G communication.

[0077] Data transmission is performed between the local side and the opposite side via 5G communication to implement the steps of the line differential protection method described above.

[0078] It is understood that in this embodiment, the local side and the opposite side refer to the protection devices on both sides of the line, respectively.

[0079] The steps of the above-mentioned line differential protection method can be implemented by any protection device on either side of the line in this application. The steps of the line differential protection method may include:

[0080] The local side of the line receives the current data and switching data of the opposite side transmitted via 5G communication after the opposite side detects a fault signal and starts the entire unit; wherein, the switching data of the opposite side includes at least PT status switching data and CT status switching data.

[0081] Based on the switch data on the other side, determine whether the differential allowable condition is met. If the differential allowable condition is met, then perform differential operation.

[0082] If the result of the differential operation satisfies the differential action condition, then the differential action is performed.

[0083] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the line differential protection method as described in any of the preceding claims.

[0084] The computer-readable storage medium may include random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0085] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that the elements inherent in a process, method, article, or apparatus that includes a list of elements are included. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Additionally, portions of the technical solutions provided in the embodiments of this application that are consistent with the implementation principles of corresponding technical solutions in the prior art have not been described in detail to avoid excessive elaboration.

[0086] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A line differential protection method, characterized in that, include: The local side of the line receives the current data and switching data of the opposite side transmitted via 5G communication after the opposite side detects a fault signal and starts the entire system. The switching data of the opposite side includes at least PT status switching data and CT status switching data. Specifically, the switching data of the opposite side includes the switching data corresponding to differential protection activation, TWJ and no current, current surge activation, zero-sequence current activation, phase or phase-to-phase voltage less than 60% and no PT disconnection, minimum phase voltage > 70% of rated phase voltage, zero-sequence voltage with floating threshold greater than 1V, negative-sequence voltage with floating threshold greater than 2V, and PT disconnection. Based on the opposite side current data and the opposite side switch data, determine whether the opposite side meets the differential allowable conditions. If the opposite side meets the differential allowable conditions, then perform differential operation. If the result of the differential operation satisfies the differential action condition, then the differential action is performed; Determining whether the differential protection condition is met based on the opposite side current data and the opposite side switching data includes: Determine whether the differential equation is satisfied between the current data collected most recently on the opposite side and the local current data on the local side. If yes, determine whether the opposite side satisfies at least one of the following: opposite side current sudden change, opposite side jump, opposite side voltage recovery and PT not disconnected. If yes, the opposite side satisfies the differential allowable condition. The differential operation process includes: Differential equation calculations are performed on the local side current data and the opposite side current data within a preset time period; If both the local current data and the opposite current data satisfy the differential equation within the preset time period, then the differential action condition is satisfied. When no fault signal is detected on either the local side or the opposite side, the local side and the opposite side transmit current data to each other according to a predetermined cycle. When the local side detects a sudden change in either the local side voltage or the local side current, the local side detects the fault signal. When the local side detects the fault signal, it sends local side current data and local side switching data to the opposite side.

2. A line differential protection device, characterized in that, include: The data transmission module is used to receive, on the local side of the line, the current data and switching data transmitted by the opposite side via 5G communication after the opposite side detects a fault signal and starts the entire system; wherein, the switching data of the opposite side includes PT status switching data and CT status switching data; the switching data of the opposite side specifically includes the switching data corresponding to differential protection activation, TWJ and no current, current surge activation, zero-sequence current activation, phase or phase-to-phase voltage less than 60% and no PT disconnection, minimum phase voltage > 70% of rated phase voltage, zero-sequence voltage with floating threshold greater than 1V, negative-sequence voltage with floating threshold greater than 2V, and PT disconnection; The differential enable module is used to determine whether the opposite side meets the differential enable conditions based on the opposite side current data and the opposite side switch quantity data. If the opposite side meets the differential enable conditions, differential operation is performed. The differential operation module is used to perform a differential operation when the result of the differential operation meets the differential operation conditions. The differential allow module is specifically used to determine whether the differential equation is satisfied between the current data collected most recently on the opposite side and the local current data on the local side. If so, it determines whether the opposite side satisfies at least one of the following: opposite side current sudden change, opposite side jump, opposite side voltage recovery and PT not disconnected. If so, the opposite side satisfies the differential allow condition. The differential calculation module is specifically used to perform differential equation calculation on the local side current data and the opposite side current data within a preset time period; when both the local side current data and the opposite side current data satisfy the differential equation within the preset time period, the differential action condition is satisfied. The data transmission module is also used to transmit current data to each other at a predetermined period when neither the local side nor the opposite side detects a fault signal. It also includes a fault detection module, which is used to detect the fault signal on the local side when either the local side voltage or the local side current is detected on the local side. The data transmission module is also used to send local side current data and local side switching data to the opposite side when the local side detects the fault signal.

3. A line differential protection system, characterized in that, include: The local side and the opposite side are located on both sides of the line; wherein the local side and the opposite side are connected via 5G communication. Data is transmitted between the local side and the opposite side via the 5G communication to implement the steps of the line differential protection method as described in claim 1.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the line differential protection method as described in claim 1.

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