A method, system, device and medium for comprehensive protection of a non-unity power supply line

Abstract

The application relates to a non-full-phase power supply line comprehensive protection method, system, device and medium, characterized in that: when it is determined that traction power supply line protection at a transformer substation side has started, current and voltage information of two phases at the transformer substation side is collected; a fault element starting moment is recorded, a plurality of maximum sampling values in the former half cycle and a plurality of maximum sampling values corresponding to the latter half cycle before the moment are extracted; whether the traction power supply line at the transformer substation side appears a ground fault or a phase-to-phase fault is judged according to the current and voltage information, the extracted maximum sampling values and a first criterion, a second criterion and a voltage auxiliary criterion which are constructed in advance, and whether protection export is determined, and the application can be widely applied in the field of power supply lines.

Description

Technical Field

[0001] This invention relates to the field of power supply lines, and in particular to a comprehensive protection method, system, device and medium for non-full-phase power supply lines. Background Technology

[0002] With the construction of electrified railways in China, the number of traction power supply lines in the power system is increasing. Unlike traditional three-phase power supply lines, traction power supply lines generally adopt a non-full-phase power supply method, with two phases being the most common. Therefore, it is necessary to conduct research on protection schemes applicable to non-full-phase power supply lines.

[0003] In existing traction power supply line protection methods, the main protection typically employs fiber optic current differential protection for rapid fault clearing along the entire line. In principle, fiber optic current differential protection offers superior performance and can serve as the main protection for traction power supply lines. However, in actual operation, current transformers (CTs) are often not installed at the traction substation side. Figure 1 As shown, the S side represents the grid side and the Q side represents the traction side. Therefore, true fiber optic current differential protection cannot be achieved, and only backup distance can be used to clear the fault. However, backup distance has advantages in phase-to-phase short circuits, but in the case of ground faults, the distance protection itself is greatly affected by the transition resistance, and its performance is inferior to that of fiber optic current differential protection.

[0004] Therefore, based on actual engineering configurations, there is an urgent need to develop a comprehensive protection method based on the substation side. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide a comprehensive protection method, system, equipment, and medium for non-full-phase power supply lines on the substation side.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: Firstly, it provides a comprehensive protection method for non-full-phase power supply lines, comprising:

[0007] Once it is determined that the protection of the traction power supply line on the substation side has been activated, the current and voltage information of the two phases on the substation side is collected.

[0008] Record the start-up time of the faulty component, and extract several maximum sample values ​​of the first half-cycle and several corresponding maximum sample values ​​of the second half-cycle at that time;

[0009] Based on the current and voltage information, the extracted maximum sample value, and the pre-constructed first criterion, second criterion, and voltage auxiliary criterion, it is determined whether a ground fault or a phase-to-phase fault has occurred in the traction power supply line on the substation side, and then it is determined whether to protect the outlet.

[0010] Furthermore, it also includes a pre-constructed first criterion based on the current sampling values ​​at the same moment, a second criterion based on the half-cycle maximum value comparison method, and a voltage auxiliary criterion, including:

[0011] For a single-phase ground fault in a line, a first criterion based on the sampled current values ​​of the two phases of the traction power supply line at the same moment is constructed.

[0012] For phase-to-phase faults in traction power supply lines, a second criterion based on the half-cycle maximum value comparison method is constructed based on several maximum sampled values ​​of the first half-cycle and several corresponding maximum sampled values ​​of the second half-cycle at the start time of the fault-initiating element.

[0013] To ensure that the protection does not malfunction, a voltage-assisted criterion is constructed.

[0014] Furthermore, the first criterion is:

[0015] |i a +i b |>δ

[0016] Among them, i a Indicates the sampled value of phase A current on the substation side; i b δ represents the sampled value of phase B current on the substation side, and δ represents the action threshold value, which is set to avoid the maximum load current.

[0017] when|i a +i b When |>δ, a single-phase grounding fault occurs in the traction power supply line.

[0018] Furthermore, the second criterion is:

[0019] |i f1～n |>|i 1～n |

[0020] Among them, i f1～n This represents the n maximum sampled values ​​of the second half-cycle at the start-up time of the fault-initiating element; i 1～n This represents the n maximum sampled values ​​of the first half-cycle at the start-up time of the fault-initiating element;

[0021] Compare i in sequence f1～n with i 1～n The size of the sampled value, if the above second criterion exists, then the exit is protected.

[0022] Furthermore, the voltage-assisted criterion is:

[0023]

[0024] in, Pu represents the per-unit value of the fault phase voltage; Pu represents the per-unit value.

[0025] For ground faults, the protection trips when both the first criterion and the voltage auxiliary criterion are met simultaneously; for phase-to-phase faults, the protection trips when both the second criterion and the voltage auxiliary criterion are met simultaneously.

[0026] Further, the step of determining whether a ground fault or phase-to-phase fault has occurred in the substation-side traction power supply line based on the current and voltage information, the extracted maximum sample value, and pre-constructed first criteria, second criteria, and voltage auxiliary criteria, and thus determining whether to provide protection, includes:

[0027] Based on the collected current and voltage information and the extracted maximum sample value, the system determines in real time whether a ground fault or phase-to-phase fault has occurred in the traction power supply line on the substation side, according to the first criterion and voltage auxiliary criterion, as well as the second criterion and voltage auxiliary criterion. If a ground fault or phase-to-phase fault occurs, the protection trips; otherwise, the protection reliably does not operate.

[0028] Furthermore, the five maximum sample values ​​of the first half-cycle and the five maximum sample values ​​of the second half-cycle at the start-up time of the faulty component are extracted.

[0029] Secondly, a comprehensive protection system for non-full-phase power supply lines is provided, including:

[0030] The information acquisition module is used to collect the current and voltage information of two phases on the substation side when it is determined that the protection of the traction power supply line on the substation side has been activated.

[0031] The sampling value extraction module is used to record the start-up time of the faulty component and extract several maximum sampling values ​​of the first half of the cycle and several corresponding maximum sampling values ​​of the second half of the cycle at that time.

[0032] The judgment module is used to determine whether a ground fault or phase-to-phase fault has occurred in the traction power supply line on the substation side based on the current and voltage information, the extracted maximum sample value, and the pre-constructed first criterion, second criterion, and voltage auxiliary criterion, and then determine whether to protect the output.

[0033] Thirdly, a processing device is provided, including computer program instructions, wherein when the computer program instructions are executed by the processing device, they are used to implement the steps corresponding to the above-mentioned comprehensive protection method for non-full-phase power supply lines.

[0034] Fourthly, a computer-readable storage medium is provided, wherein computer program instructions are stored on the computer-readable storage medium, wherein the computer program instructions, when executed by a processor, are used to implement the steps corresponding to the above-mentioned comprehensive protection method for non-full-phase power supply lines.

[0035] The present invention has the following advantages due to the adoption of the above technical solutions:

[0036] 1. This invention makes full use of the phase angle characteristics of non-full-phase power supply in traction power supply lines, constructs different fault identification and judgment methods, and forms a comprehensive protection method for identifying ground faults and phase-to-phase faults.

[0037] 2. This invention uses sampled values ​​for judgment and can identify faults within the second half of the fault cycle. Compared with the Fourier algorithm based on the full cycle, the fault identification time is reduced by at least 50%.

[0038] 3. This invention relies entirely on the configuration of current transformers on the system side, without depending on the configuration of current transformers on the traction station side, thus having strong feasibility.

[0039] In summary, this invention can be widely applied in the field of power supply lines. Attached Figure Description

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings:

[0041] Figure 1 This is a schematic diagram of a traction power supply line structure provided in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of a method flow provided in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of a two-phase power supply current curve provided in an embodiment of the present invention. Detailed Implementation

[0044] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0045] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0046] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0047] The comprehensive protection method, system, equipment, and medium for non-full-phase power supply lines provided in this invention fully utilize the phase angle characteristics of non-full-phase power supply in traction power supply lines. It constructs a first criterion based on the current sampling value at the same moment, a second criterion based on the half-cycle maximum value comparison method, and a voltage auxiliary criterion to form a comprehensive protection method for identifying ground faults and phase-to-phase faults, which can reduce fault identification time.

[0048] Example 1

[0049] like Figure 2 As shown, this embodiment provides a comprehensive protection method for non-full-phase power supply lines, including the following steps:

[0050] 1) such as Figure 3 As shown, a first criterion based on the current sampling value at the same moment, a second criterion based on the half-cycle maximum value comparison method, and a voltage auxiliary criterion are pre-constructed, specifically as follows:

[0051] 1.1) When the power system is normal or under external fault conditions, the sum of the sampled values ​​of the two-phase currents of the traction power supply line in the power system is approximately 0. When a single-phase ground fault occurs, the sampled values ​​of the two-phase currents will change abruptly. Therefore, for a single-phase ground fault, a first criterion based on the sampled values ​​of the two-phase currents of the traction power supply line at the same instant is constructed:

[0052] |i a +i b |>δ (1)

[0053] Among them, i a Indicates the sampled value of phase A current on the substation side; i b δ represents the sampled value of phase B current on the substation side, and δ represents the action threshold value, which is set to avoid the maximum load current.

[0054] Specifically, when |i a +i b When |>δ, a single-phase grounding fault occurs in the traction power supply line.

[0055] 1.2) When there is a phase-to-phase fault in the traction power supply line, the phase angle difference between the two-phase currents is 180°, which is the same as in normal operation. Therefore, simply using the sum of the two-phase current sample values ​​is insufficient for accurate identification. Thus, for phase-to-phase faults in the traction power supply line, a second criterion based on the comparison of the maximum half-cycle values ​​is constructed, using the five maximum sample values ​​in the first half-cycle and the five maximum sample values ​​in the second half-cycle at the start-up time of the fault-initiating element.

[0056] |i f1～5 |>|i 1～5 | (2)

[0057] Among them, i f1～5 This represents the five maximum sampled values ​​of the second half-cycle at the start-up time of the fault-initiating element; i 1～5 This represents the five maximum sampled values ​​of the first half-cycle at the start-up time of the fault-initiating element.

[0058] Specifically, compare i in sequence f1～5 with i 1～5 The sampled value size, if the above second criterion exists, then the exit is protected. For example: when |i f1 When |>|i1|, a phase-to-phase fault occurs in the traction power supply line, and the protection output is activated.

[0059] 1.3) To ensure the protection does not malfunction, a voltage-assisted criterion is constructed:

[0060]

[0061] in, This indicates the per-unit value of the fault phase voltage; Pu indicates the per-unit value.

[0062] Specifically, for ground faults, the protection trips when both the first criterion and the voltage auxiliary criterion are met simultaneously; for phase-to-phase faults, the protection trips when both the second criterion and the voltage auxiliary criterion are met simultaneously.

[0063] 2) Perform a self-test on the traction power supply line on the substation side to determine whether the protection is activated. If yes, proceed to step 3); otherwise, perform the self-test again.

[0064] 3) Real-time acquisition of two phases (e.g., on the substation side, S side) Figure 2 The current and voltage information of phase A and phase B in the data.

[0065] 4) Record the start-up time t0 of the faulty component, and extract the five maximum sampled values ​​i of the first half-cycle at time t0. 1～5 and the five largest sampled values ​​i in the second half of the week f1～5 .

[0066] 5) Based on the real-time collected current and voltage information, the extracted maximum sample value, and the pre-constructed first criterion, second criterion, and voltage auxiliary criterion, determine whether a ground fault or phase-to-phase fault has occurred in the traction power supply line on the substation side, and then determine whether to protect the output.

[0067] Specifically, based on the real-time collected current and voltage information and the extracted maximum sample value, the system determines in real time whether a ground fault or phase-to-phase fault has occurred in the traction power supply line on the substation side, according to the first criterion and voltage auxiliary criterion, as well as the second criterion and voltage auxiliary criterion. If a ground fault or phase-to-phase fault occurs, the protection trips; otherwise, the protection reliably does not operate.

[0068] Example 2

[0069] This embodiment provides a comprehensive protection system for non-full-phase power supply lines, including:

[0070] The information acquisition module is used to collect the current and voltage information of two phases on the substation side when it is determined that the protection of the traction power supply line on the substation side has been activated.

[0071] The sampling value extraction module is used to record the start-up time of the faulty component and extract several maximum sampling values ​​of the first half of the cycle and several corresponding maximum sampling values ​​of the second half of the cycle at that time.

[0072] The judgment module is used to determine whether a ground fault or phase-to-phase fault has occurred in the traction power supply line on the substation side based on the real-time collected current and voltage information, the extracted maximum sample value, and the pre-constructed first criterion, second criterion, and voltage auxiliary criterion, and then determine whether to protect the output.

[0073] In a preferred embodiment, a self-testing module is also included to perform a self-test on the traction power supply line on the substation side to determine whether the protection has been activated.

[0074] In a preferred embodiment, the system further includes a criterion construction module for pre-constructing a first criterion based on the current sampling value at the same moment, a second criterion based on the half-cycle maximum value comparison method, and a voltage auxiliary criterion.

[0075] Specifically, the process of the criterion construction module is as follows: For a single-phase ground fault in the line, a first criterion based on the current sampling values ​​at the same moment is constructed according to the two-phase current sampling values ​​of the traction power supply line; for a phase-to-phase fault in the traction power supply line, a second criterion based on the half-cycle maximum value comparison method is constructed according to several maximum sampling values ​​of the first half-cycle and several corresponding maximum sampling values ​​of the second half-cycle at the start time of the fault starting element; and to ensure that the protection does not maloperate, a voltage auxiliary criterion is constructed.

[0076] In a preferred embodiment, the specific process of the judgment module is as follows: based on the collected current and voltage information and the extracted maximum sample value, according to the first criterion and voltage auxiliary criterion and the second criterion and voltage auxiliary criterion, it determines in real time whether a ground fault or phase-to-phase fault has occurred in the traction power supply line on the substation side. If a ground fault or phase-to-phase fault occurs, the protection trips; otherwise, the protection reliably does not operate.

[0077] The system provided in this embodiment is used to execute the above-described method embodiments. For specific processes and details, please refer to the above embodiments, which will not be repeated here.

[0078] Example 3

[0079] This embodiment provides a processing device corresponding to the comprehensive protection method for non-full-phase power supply lines provided in Embodiment 1. The processing device can be applied to client processing devices, such as mobile phones, laptops, tablets, desktop computers, etc., to execute the method of Embodiment 1.

[0080] The processing device includes a processor, a memory, a communication interface, and a bus. The processor, memory, and communication interface are connected via the bus to enable communication between them. The memory stores a computer program that can run on the processing device. When the processing device runs the computer program, it executes the comprehensive protection method for non-full-phase power supply lines provided in Embodiment 1.

[0081] In some implementations, the memory may be high-speed random access memory (RAM), and may also include non-volatile memory, such as at least one disk storage device.

[0082] In other implementations, the processor can be any type of general-purpose processor, such as a central processing unit (CPU) or a digital signal processor (DSP), and there is no limitation here.

[0083] Furthermore, the logical instructions in the aforementioned memory can be implemented as software functional units and sold or used as independent products, and can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0084] Those skilled in the art will understand that the structure of the above-described computing device is only a partial structure related to the solution of this application and does not constitute a limitation on the computing device to which the solution of this application is applied. A specific computing device may include more or fewer components, or combine certain components, or have different component arrangements.

[0085] Example 4

[0086] This embodiment provides a computer program product corresponding to the comprehensive protection method for non-full-phase power supply lines provided in Embodiment 1. The computer program product may include a computer-readable storage medium on which computer-readable program instructions for executing the comprehensive protection method for non-full-phase power supply lines described in Embodiment 1 are loaded.

[0087] A computer-readable storage medium can be a tangible device that holds and stores instructions for use by an instruction execution device. A computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination thereof.

[0088] The computer-readable storage medium provided in the above embodiments has a similar implementation principle and technical effect to the above method embodiments, and will not be described again here.

[0089] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0090] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0091] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0092] The above embodiments are only used to illustrate the present invention. The structure, connection method and manufacturing process of each component can be varied. All equivalent transformations and improvements made on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A comprehensive protection method for a non-full-phase power supply line, characterized in that, include: Once it is determined that the protection of the traction power supply line on the substation side has been activated, the current and voltage information of the two phases on the substation side is collected. Record the start-up time of the faulty component, and extract several maximum sample values ​​of the first half-cycle and several corresponding maximum sample values ​​of the second half-cycle at that time; Based on the current and voltage information, the extracted maximum sample value, and the pre-constructed first criterion, second criterion, and voltage auxiliary criterion, it is determined whether a ground fault or a phase-to-phase fault has occurred in the traction power supply line on the substation side, and then it is determined whether to protect the output. The first criterion is: in, This represents the sampled value of phase A current on the substation side; This represents the sampled value of phase B current on the substation side. This indicates the action threshold value, which is set to avoid the maximum load current. when At that time, a single-phase ground fault will occur in the traction power supply line; The second criterion is: in, Indicates the second half-cycle of the starting time of the faulty starting element. The maximum sample value; This indicates the first half of the cycle at the start-up time of the faulty starting element. The maximum sample value; Compare in turn and The size of the sampled value; if the second criterion mentioned above exists, then the exit is protected; The voltage-assisted criterion is: in, This indicates the per-unit value of the fault phase voltage; Indicates the per-unit value; For ground faults, the protection trips when both the first criterion and the voltage auxiliary criterion are met simultaneously; for phase-to-phase faults, the protection trips when both the second criterion and the voltage auxiliary criterion are met simultaneously.

2. The comprehensive protection method for a non-full-phase power supply line as described in claim 1, characterized in that, It also includes a pre-constructed first criterion based on the current sampling value at the same moment, a second criterion based on the half-cycle maximum value comparison method, and a voltage auxiliary criterion, including: For a single-phase ground fault in a line, a first criterion based on the sampled current values ​​of the two phases of the traction power supply line at the same moment is constructed. For phase-to-phase faults in traction power supply lines, a second criterion based on the half-cycle maximum value comparison method is constructed based on several maximum sampled values ​​of the first half-cycle and several corresponding maximum sampled values ​​of the second half-cycle at the start time of the fault-initiating element. To ensure that the protection does not malfunction, a voltage-assisted criterion is constructed.

3. The comprehensive protection method for a non-full-phase power supply line as described in claim 1, characterized in that, The process of determining whether a ground fault or phase-to-phase fault has occurred in the substation-side traction power supply line based on the current and voltage information, the extracted maximum sample value, and pre-constructed first criteria, second criteria, and voltage auxiliary criteria, and then determining whether to provide protection, includes: Based on the collected current and voltage information and the extracted maximum sample value, the system determines in real time whether a ground fault or phase-to-phase fault has occurred in the traction power supply line on the substation side, according to the first criterion and voltage auxiliary criterion, as well as the second criterion and voltage auxiliary criterion. If a ground fault or phase-to-phase fault occurs, the protection trips; otherwise, the protection reliably does not operate.

4. The comprehensive protection method for a non-full-phase power supply line as described in claim 1, characterized in that, Extract the five maximum sample values ​​of the first half-cycle and the corresponding five maximum sample values ​​of the second half-cycle at the start-up time of the faulty component.

5. A comprehensive protection system for a non-full-phase power supply line, characterized in that, include: The information acquisition module is used to collect the current and voltage information of two phases on the substation side when it is determined that the protection of the traction power supply line on the substation side has been activated. The sampling value extraction module is used to record the start-up time of the faulty component and extract several maximum sampling values ​​of the first half of the cycle and several corresponding maximum sampling values ​​of the second half of the cycle at that time. The judgment module is used to determine whether a ground fault or phase-to-phase fault has occurred in the traction power supply line on the substation side based on the current and voltage information, the extracted maximum sample value, and the pre-constructed first criterion, second criterion, and voltage auxiliary criterion, and then determine whether to protect the output. The first criterion is: in, This represents the sampled value of phase A current on the substation side; This represents the sampled value of phase B current on the substation side. This indicates the action threshold value, which is set to avoid the maximum load current. when At that time, a single-phase ground fault will occur in the traction power supply line; The second criterion is: in, Indicates the second half-cycle of the starting time of the faulty starting element. The maximum sample value; This indicates the first half of the cycle at the start-up time of the faulty starting element. The maximum sample value; Compare in turn and The size of the sampled value; if the second criterion mentioned above exists, then the exit is protected; The voltage-assisted criterion is: in, This indicates the per-unit value of the fault phase voltage; Indicates the per-unit value; For ground faults, the protection trips when both the first criterion and the voltage auxiliary criterion are met simultaneously; for phase-to-phase faults, the protection trips when both the second criterion and the voltage auxiliary criterion are met simultaneously.

6. A processing apparatus, characterized in that, It includes computer program instructions, wherein when executed by a processing device, the computer program instructions are used to implement the steps corresponding to the comprehensive protection method for non-full-phase power supply lines as described in any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions, wherein when the computer program instructions are executed by a processor, they are used to implement the steps corresponding to the comprehensive protection method for non-full-phase power supply lines according to any one of claims 1-4.

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