A dead zone fault identification method and load side protection device

Abstract

The present application relates to a dead zone fault identification method, a load side protection device and a computer storage medium. The dead zone fault identification method is applied to a transmission line. A load side circuit breaker is provided on each phase line on the load side of the transmission line. The dead zone fault identification method includes: determining whether each load side circuit breaker is in an open state; obtaining the electrical parameters of the target phase line; the target phase line is the phase line corresponding to the load side circuit breaker in the open state; if the electrical parameters of the target phase line meet the preset conditions, it is determined that a dead zone fault occurs in the target phase line. The present invention can quickly and reliably identify dead zone faults of transmission lines.

Description

Technical Field

[0001] The present application relates to the technical field of power system fault identification, and in particular to a dead zone fault identification method, a load side protection device, a computer device and a storage medium. Background Art

[0002] In order to ensure the safe and stable operation of the power system, the protection device is required to quickly and selectively remove the fault after a fault occurs anywhere in the system. Especially in the 220kV power grid, if a dead zone fault occurs and the busbar protection is activated, it will cause a large-scale power outage, which may cause power outage to users at the least, or even cause system oscillation and decoupling, or even cause the power grid to collapse.

[0003] It is difficult to quickly and reliably identify dead zone faults in transmission lines using traditional technologies. Summary of the invention

[0004] Based on this, it is necessary to provide a dead zone fault identification method, a load side protection device and a computer readable storage medium that can quickly and reliably identify dead zone faults of transmission lines in order to address the above technical problems.

[0005] On the one hand, an embodiment of the present invention provides a dead zone fault identification method, which is applied to a transmission line. A load side circuit breaker is provided on each phase line on the load side of the transmission line. The dead zone fault identification method includes: determining whether each load side circuit breaker is in an open state; obtaining the electrical parameters of the target phase line; the target phase line is the phase line corresponding to the load side circuit breaker in the open state; if the electrical parameters of the target phase line meet preset conditions, it is determined that a dead zone fault occurs on the target phase line.

[0006] In one of the embodiments, the step of determining whether the load-side circuit breaker on the load side of each phase line is in an open state includes: obtaining the current of the trip position relay corresponding to each load-side circuit breaker; if the current of the trip position relay corresponding to the load-side circuit breaker is greater than a first preset current and the duration for which the current of the trip position relay corresponding to the load-side circuit breaker is greater than the first preset current is greater than a preset time, then determining that the load-side circuit breaker is in an open state.

[0007] In one embodiment, the electrical parameters include phase current. If the electrical parameters of the target phase line meet preset conditions, the step of determining whether a dead zone fault occurs in the target phase line includes: if the phase current of the target phase line is greater than a second preset current, determining whether a dead zone fault occurs in the target phase line.

[0008] In one embodiment, the electrical parameters include a phase voltage on the power supply side. If the electrical parameters of the target phase line meet preset conditions, the step of determining whether a dead zone fault has occurred in the target phase line includes: if the phase voltage on the power supply side of the target phase line is less than a first preset voltage, determining that a dead zone fault has occurred in the target phase line.

[0009] In one embodiment, the electrical parameters include a zero-sequence voltage on the power supply side or a negative-sequence voltage on the power supply side. If the electrical parameters of the target phase line meet preset conditions, the step of determining whether a dead-zone fault has occurred in the target phase line includes: if the zero-sequence voltage on the power supply side or the negative-sequence voltage on the power supply side of the target phase line is greater than a second preset voltage, then it is determined that a dead-zone fault has occurred in the target phase line.

[0010] On the other hand, an embodiment of the present invention further provides a load-side protection device, which is applied to a transmission line. A power-side protection device is provided on the power-side of the transmission line, and a load-side circuit breaker is provided on each phase line on the load side of the transmission line. The load-side protection device is provided on the load side of the transmission line, and the load-side protection device comprises: an electrical parameter acquisition module, which is used to acquire electrical parameters of a target phase line; the target phase line is a phase line corresponding to a load-side circuit breaker in an open state; a processing module, which is connected to the electrical parameter acquisition module, and is used to determine whether each load-side circuit breaker is in an open state; acquiring the electrical parameters of the target phase line fed back by the electrical parameter acquisition module; if the electrical parameters of the target phase line meet preset conditions, it is determined that a dead zone fault occurs on the target phase line.

[0011] In one embodiment, the electrical parameter includes a phase current, and the electrical parameter acquisition module is used to acquire the phase current of the target phase line; the processing module is used to determine that a dead zone fault occurs in the target phase line if the phase current of the target phase line is greater than a second preset current.

[0012] In one of the embodiments, the electrical parameters include the phase voltage on the power supply side, and the electrical parameter acquisition module is connected to the power supply side protection device through an optical fiber channel communication. The electrical parameter acquisition module is used to interact with the power supply side protection device to obtain the power supply side phase voltage of the target phase line fed back by the power supply side protection device; the processing module is also used to determine that a dead zone fault occurs in the target phase line if the power supply side phase voltage of the target phase line is less than a first preset voltage.

[0013] In one of the embodiments, the electrical parameters include a negative-sequence voltage on the power supply side or a zero-sequence voltage on the power supply side. The electrical parameter acquisition module is connected to the power supply side protection device through an optical fiber channel communication. The electrical parameter acquisition module is used to interact with the power supply side protection device to obtain the negative-sequence voltage on the power supply side or the zero-sequence voltage on the power supply side of the target phase line fed back by the power supply side protection device; the processing module is also used to determine that a dead zone fault occurs in the target phase line if the zero-sequence voltage on the power supply side of the target phase line or the negative-sequence voltage on the power supply side of the target phase line is greater than a second preset voltage.

[0014] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, and the computer program implements the steps of the above method when executed by a processor.

[0015] Based on any of the above embodiments, the phase line in which the load-side circuit breaker is in the open state is used as the target phase line, and the electrical parameters of the target phase line are further analyzed. When the electrical parameters of the target phase line meet the preset conditions, it is determined that a dead zone fault has occurred in the target phase line. This embodiment effectively and quickly identifies the dead zone fault on the transmission line, provides a basis for the power system to better handle the dead zone fault, and plays a significant role in improving the stability of the circuit system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is an application scenario diagram of a dead zone fault identification method in an embodiment;

[0018] Figure 2 A schematic diagram of a dead zone fault identification method in one embodiment;

[0019] Figure 3 It is a flowchart of the steps of determining whether the load-side circuit breaker is in an open state in one embodiment;

[0020] Figure 4 It is a schematic diagram of the structural block diagram of a load side protection device in one embodiment. DETAILED DESCRIPTION

[0021] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0023] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0024] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0025] When used herein, the singular forms "a", "an" and " / the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0026] Generally, the side of the transmission line connected to the power source is called the power side, and the side of the transmission line connected to the load is called the load side. The transmission line is equipped with power side protection devices and load side protection devices respectively. Figure 1 Take the transmission line shown in the figure as an example, where the main protection of the transmission line is configured with optical fiber current differential protection, and the protection range of the differential protection is between the current transformer TA1 and the current transformer TA2. The load side protection device and the power supply side protection device can be protected by controlling the circuit breaker QF1 and the circuit breaker QF2 in case of failure (QF1 and QF2 are set on the three-phase line, and only the single phase is shown in the figure). Figure 1 When a fault occurs at point K shown in the figure, the fault point is between the current transformer TA2 and the circuit breaker QF2, which is beyond the protection range of the line differential protection. The line differential protection will not operate, so this type of fault is called a dead zone fault. Dead zone faults in traditional technology can only be removed by backup protection, and the backup protection action time generally exceeds 1S, which cannot meet the speed requirement. The long-term existence of fault current will cause strong electric force to the equipment on one side, causing irreversible and serious damage to important equipment on one side such as generators and transformers, and will also cause the system voltage to be pulled down for a long time, causing the system voltage to collapse, and ultimately leading to the instability and collapse of the entire power grid. Therefore, a method that can quickly and reliably identify dead zone faults is of great significance to the stable operation of the power system.

[0027] Based on the above reasons, the present invention provides a dead zone fault identification method, such as Figure 2As shown, the dead zone fault identification method includes steps S110 to S150.

[0028] S110, determining whether each load-side circuit breaker is in an open state.

[0029] It can be understood that the working state of the load-side circuit breaker includes a closed state and an open state. The present application is aimed at the situation where a dead zone fault occurs after the load-side circuit breaker is in the open state.

[0030] S130, obtaining electrical parameters of the target phase line.

[0031] The target phase line is the phase line corresponding to the load-side circuit breaker in the open state. It can be understood that if the load-side circuit breaker of any phase on the three phase lines of the transmission line is in the open state, the target phase line of that phase is selected, and the operating state of the target phase line is further analyzed to determine whether a dead zone fault occurs in the target phase line. Faults other than dead zone faults can be reliably removed by the opening of the load-side protection device. However, when a dead zone fault occurs, the power supply directly connected to the transmission line will still be connected to the ground through the target phase line and the upper fault point of the target phase line. At this time, the electrical parameters of the target phase line will also be abnormal due to the grounding of the power supply.

[0032] S150: If the electrical parameters of the target phase line meet the preset conditions, it is determined that a dead zone fault occurs in the target phase line.

[0033] It can be understood that when the electrical parameters of the target phase line meet the preset conditions, it can be determined that the target phase line is still abnormal after the corresponding load-side circuit breaker enters the open state, so as to determine that the power supply directly connected to the transmission line is still connected to the earth through the target phase line and the upper fault point of the target phase line, and determine that a dead zone fault occurs in the target phase line.

[0034] Based on the dead zone fault identification method in the embodiment of the present invention, the phase line in which the load-side circuit breaker is in the open state is taken as the target phase line, and the electrical parameters of the target phase line are further analyzed. When the electrical parameters of the target phase line meet the preset conditions, it is determined that a dead zone fault has occurred in the target phase line. This embodiment effectively and quickly identifies dead zone faults on transmission lines, provides a basis for the power system to better handle dead zone faults, and plays a significant role in improving the stability of the circuit system.

[0035] In one embodiment, Figure 3 As shown, step S110 includes steps S111 to S113.

[0036] S111, obtaining the current of the trip position relay corresponding to each load-side circuit breaker.

[0037] It will be appreciated that the trip position relay is used to indicate the position of the circuit breaker on the load side.

[0038] S113, if the current of the trip position relay corresponding to the load side circuit breaker is greater than the first preset current and the duration of the current of the trip position relay corresponding to the load side circuit breaker being greater than the first preset current is greater than the preset time, it is determined that the load side circuit breaker is in the open state.

[0039] Specifically, when the load-side circuit breaker enters the open state, the corresponding trip position relay will be energized, so it can be determined whether the trip position relay is energized based on the current of the trip position relay, and further whether the load-side circuit breaker enters the open state. In addition, in order to avoid misjudgment caused by system fluctuations, measurement errors, etc., the load-side circuit breaker is determined to be in the open state only when the current of the corresponding trip position relay is greater than the first preset current for a duration greater than the preset time. The first preset current can be set according to the normal working current of the trip position relay.

[0040] In one embodiment, the electrical parameter includes phase current, and step S150 is specifically as follows: if the phase current of the target phase line is greater than the second preset current, it is determined that a dead zone fault occurs in the target phase line. It can be understood that when the power source directly connected to the transmission line is connected to the earth through the target phase line and the upper fault point of the target phase line, a short-circuit current provided by the power source will flow through the target phase line. Therefore, if the load-side circuit breaker is in an open state, a large phase current still appears on the target phase line, and it can be determined that a dead zone fault occurs in the target phase line. In a specific embodiment, the existing transmission line has a structure in which current transformers are provided on each phase line, and each current transformer sends the phase current of the corresponding phase line to the processing module of the load-side protection device. The processing module of the load-side protection device can determine the current transformer corresponding to the target phase line from each current transformer, thereby obtaining the phase current of the target phase line. By changing the protection logic of the processing module of the load-side protection device according to the method in this embodiment, the identification of dead zone faults can be achieved without adding other equipment.

[0041] In one embodiment, the electrical parameter includes the phase voltage on the power supply side, and step S150 is specifically as follows: if the phase voltage on the power supply side of the target phase line is less than the first preset voltage, it is determined that a dead zone fault occurs in the target phase line. It can be understood that when the power supply directly connected to the transmission line is connected to the earth through the target phase line and the upper fault point of the target phase line, the phase voltage on the power supply side of the target phase line will be pulled down by the grounding of the fault point. Therefore, if the load-side circuit breaker is in the open state, a smaller phase voltage on the power supply side appears on the target phase line, and it can be determined that a dead zone fault occurs in the target phase line. In a specific embodiment, voltage transformers are provided on the three-phase lines on the power supply side of the existing transmission line, and each voltage transformer sends the power supply side phase voltage of the corresponding phase line to the processing module of the power supply side protection device. The power supply side protection device is connected to the load-side protection device through an optical fiber channel, and the phase voltages of each phase line are transmitted to the load-side protection device through the optical fiber channel. The processing module of the load-side protection device can determine the power supply side phase voltage corresponding to the target phase line from the multiple phase voltages fed back by the power supply side protection device. By changing the protection logic of the processing module of the load-side protection device according to the method in this embodiment, the identification of the dead zone fault can be achieved without adding other equipment.

[0042] In one embodiment, the electrical parameters include the zero-sequence voltage on the power supply side or the negative-sequence voltage on the power supply side, and step S150 includes: if the zero-sequence voltage on the power supply side of the target phase line or the negative-sequence voltage on the power supply side of the target phase line is greater than the second preset voltage, it is determined that a dead zone fault occurs in the target phase line. It can be understood that when the number of target phase lines is less than the number of phases of the transmission line, the fault occurring on the transmission line is an asymmetric fault. According to the analysis of the symmetrical component method commonly used in the power system, when an asymmetric fault occurs in the transmission line, each phase line may have a zero-sequence component or a negative-sequence component. This embodiment specifically selects the zero-sequence voltage on the power supply side and the negative-sequence voltage on the power supply side as electrical parameters. When the load-side circuit breaker is in the open state, if the zero-sequence voltage on the power supply side or the negative-sequence voltage on the power supply side on the target phase line is still relatively large, it can be determined that a dead zone fault has occurred. In a specific embodiment, the existing transmission line has a structure in which each phase line is provided with a voltage transformer, and each voltage transformer sends the power supply side phase voltage of the corresponding phase line to the processing module of the load side protection device, and the processing module of the load side protection device calculates the power supply side zero-sequence voltage or the power supply side negative-sequence voltage of the target phase line according to the power supply side phase voltage of each phase line of the transmission line. By changing the protection logic of the processing module of the load side protection device according to the method in this embodiment, the identification of dead zone faults can be realized without adding other equipment.

[0043] It should be understood that although Figure 2-Figure 3The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 2-Figure 3 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0044] The embodiment of the present invention also provides a load side protection device 10, such as Figure 4 As shown, it is applied to a transmission line, a power supply side protection device is provided on the power supply side of the transmission line, a load side circuit breaker is provided on each phase line on the load side of the transmission line, and a load side protection device 10 is provided on the load side of the transmission line. The load side protection device 10 includes an electrical parameter acquisition module 11 and a processing module 13.

[0045] The electrical parameter acquisition module 11 is used to acquire the electrical parameters of the target phase line. The target phase line is the phase line corresponding to the load-side circuit breaker in the open state. The processing module 13 is connected to the electrical parameter acquisition module 11, and is used to determine whether each load-side circuit breaker is in the open state, and to acquire the electrical parameters of the target phase line fed back by the electrical parameter acquisition module 11, and also to determine that a dead zone fault occurs in the target phase line when the electrical parameters of the target phase line meet the preset conditions.

[0046] In one embodiment, the electrical parameter includes a phase current, and the electrical parameter acquisition module 11 includes a phase current acquisition unit, which is used to acquire the phase current of the target phase line. The processing module 13 is also used to determine that a dead zone fault occurs in the target phase line when the phase current of the target phase line fed back by the phase current acquisition unit is greater than a second preset current. In a specific embodiment, the phase current acquisition unit is a current transformer (such as a current transformer) arranged on each phase line of the transmission line. Figure 1 In TA2), the current transformer is used to obtain the current of the corresponding phase line, and the processing module 13 is connected to each current transformer. The processing module 13 is used to determine the phase current sent by the current transformer corresponding to the target phase line from the phase current sent by each current transformer, so as to obtain the phase current of the target phase line. By changing the protection logic of the processing module 13 of the load side protection device 10, the identification of the dead zone fault can be realized without adding other equipment.

[0047] In one embodiment, the electrical parameter includes the phase voltage on the power supply side, and the electrical parameter acquisition module 11 is connected to the power supply side protection device through an optical fiber channel communication. The processing module 13 is also used for if the power supply side phase voltage of the target phase line is connected, the electrical parameter acquisition module 11 is used to interact with the power supply side protection device to obtain the power supply side phase voltage of the target phase line fed back by the power supply side protection device. The processing module 13 is also used for if the power supply side phase voltage of the target phase line is less than the first preset voltage, then determining that a dead zone fault occurs in the target phase line. In a specific embodiment, voltage transformers are provided on the three-phase lines on the power supply side of the existing transmission line, and each voltage transformer sends the power supply side phase voltage of the corresponding phase line to the processing module 13 of the power supply side protection device. The power supply side protection device is connected to the load side protection device 10 through an optical fiber channel communication, and the phase voltage of each phase line is transmitted to the load side protection device 10 through the optical fiber channel. The processing module 13 of the load side protection device 10 can determine the power supply side phase voltage corresponding to the target phase line from the multiple phase voltages fed back by the power supply side protection device. By changing the protection logic of the processing module 13 of the load side protection device 10, the dead zone fault can be identified without adding other equipment.

[0048] In one embodiment, the electrical parameter includes a zero-sequence voltage on the power supply side or a negative-sequence voltage on the power supply side. The processing module 13 is also used to determine that a dead zone fault occurs in the target phase line if the zero-sequence voltage on the power supply side of the target phase line or the negative-sequence voltage on the power supply side of the target phase line is greater than a second preset voltage. In a specific embodiment, the power supply side protection device also obtains the zero-sequence voltage transformer on the power supply side through a zero-sequence voltage transformer arranged on the power supply side, or obtains the negative-sequence voltage on the power supply side through a negative-sequence voltage transformer arranged on the power supply side. The power supply side protection device can also calculate the zero-sequence voltage on the power supply side or the negative-sequence voltage on the power supply side through the phase voltages of each phase on the power supply side. The power supply side protection device is connected to the load side protection device 10 through an optical fiber channel communication, and the negative-sequence voltage on the power supply side or the zero-sequence voltage on the power supply side is transmitted to the load side protection device 10 through the optical fiber channel, and the processing module 13 of the load side protection device 10 can obtain the negative-sequence voltage on the power supply side or the zero-sequence voltage on the power supply side. By changing the protection logic of the processing module 13 of the load side protection device 10 according to the method in this embodiment, the identification of the dead zone fault can be realized without adding other equipment.

[0049] For the specific limitations of the load-side protection device 10, please refer to the limitations of the dead zone fault identification method mentioned above, which will not be repeated here. The various modules in the above-mentioned load-side protection device 10 can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0050] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned dead zone fault identification method are implemented.

[0051] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0052] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0053] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A dead zone fault identification method, characterized in that: Applied to a power transmission line, each phase line on the load side of the transmission line is provided with a load side circuit breaker, and the dead zone fault identification method includes: Determining whether each of the load-side circuit breakers is in an open state specifically includes: obtaining the current of the trip position relay corresponding to each of the load-side circuit breakers; the trip position relay is used to indicate the position of the load-side circuit breaker; if the current of the trip position relay corresponding to the load-side circuit breaker is greater than a first preset current and the current of the trip position relay corresponding to the load-side circuit breaker is greater than the first preset current for a duration greater than a preset time, then determining that the load-side circuit breaker is in an open state; the first preset current is set according to the normal working current of the trip position relay; Acquire electrical parameters of a target phase line; the target phase line is a phase line corresponding to the load-side circuit breaker in an open state; If the electrical parameters of the target phase line meet the preset conditions, it is determined that a dead zone fault occurs on the target phase line.

2. The dead zone fault identification method according to claim 1, characterized in that: The electrical parameter includes a phase current, and if the electrical parameter of the target phase line meets a preset condition, the step of determining that a dead zone fault occurs in the target phase line includes: If the phase current of the target phase line is greater than the second preset current, it is determined that a dead zone fault occurs on the target phase line.

3. The dead zone fault identification method according to claim 1, characterized in that: The electrical parameter includes a phase voltage on the power supply side. If the electrical parameter of the target phase line meets a preset condition, the step of determining that a dead zone fault occurs on the target phase line includes: If the power supply side phase voltage of the target phase line is less than a first preset voltage, it is determined that a dead zone fault occurs on the target phase line.

4. The dead zone fault identification method according to claim 1, characterized in that: The electrical parameter includes a zero-sequence voltage on the power supply side or a negative-sequence voltage on the power supply side. If the electrical parameter of the target phase line meets a preset condition, the step of determining that a dead zone fault occurs on the target phase line includes: If the zero-sequence voltage on the power supply side of the target phase line or the negative-sequence voltage on the power supply side of the target phase line is greater than a second preset voltage, it is determined that a dead zone fault occurs on the target phase line.

5. A load side protection device, characterized in that: Applied to a power transmission line, a power supply side protection device is provided on the power supply side of the transmission line, a load side circuit breaker is provided on each phase line on the load side of the transmission line, the load side protection device is provided on the load side of the transmission line, and the load side protection device comprises: An electrical parameter acquisition module, used to acquire electrical parameters of a target phase line; the target phase line is a phase line corresponding to the load-side circuit breaker in an open state; A processing module is connected to the electrical parameter acquisition module, and is used to determine whether each of the load-side circuit breakers is in an open state, and is specifically used to obtain the current of the trip position relay corresponding to each of the load-side circuit breakers; the trip position relay is used to indicate the position of the load-side circuit breaker; if the current of the trip position relay corresponding to the load-side circuit breaker is greater than a first preset current and the current of the trip position relay corresponding to the load-side circuit breaker is greater than the first preset current for a duration greater than a preset time, it is determined that the load-side circuit breaker is in an open state; the first preset current is set according to the normal working current of the trip position relay; the electrical parameters of the target phase line fed back by the electrical parameter acquisition module are obtained; if the electrical parameters of the target phase line meet the preset conditions, it is determined that a dead zone fault occurs in the target phase line.

6. The load side protection device according to claim 5, characterized in that: The electrical parameter includes phase current, and the electrical parameter acquisition module is used to acquire the phase current of the target phase line; The processing module is used for determining that a dead zone fault occurs in the target phase line if the phase current of the target phase line is greater than a second preset current.

7. The load side protection device according to claim 5, characterized in that: The electrical parameter includes a power supply side phase voltage, the electrical parameter acquisition module is connected to the power supply side protection device through an optical fiber channel communication, and the electrical parameter acquisition module is used to interact with the power supply side protection device to obtain the power supply side phase voltage of the target phase line fed back by the power supply side protection device; The processing module is further configured to determine that a dead zone fault occurs on the target phase line if the power supply side phase voltage of the target phase line is less than a first preset voltage.

8. The load side protection device according to claim 5, characterized in that: The electrical parameter includes a negative-sequence voltage on the power supply side or a zero-sequence voltage on the power supply side. The electrical parameter acquisition module is connected to the power supply side protection device through an optical fiber channel communication. The electrical parameter acquisition module is used to interact with the power supply side protection device to obtain the negative-sequence voltage on the power supply side or the zero-sequence voltage on the power supply side of the target phase line fed back by the power supply side protection device; The processing module is further configured to determine that a dead zone fault occurs on the target phase line if a zero-sequence voltage on the power supply side of the target phase line or a negative-sequence voltage on the power supply side of the target phase line is greater than a second preset voltage.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

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