A method and system for determining and locating fault types in overhead power distribution lines.

Abstract

This invention provides a method, system, device, and storage medium for determining and locating fault types in overhead power distribution lines. The method includes acquiring the instantaneous transient waveform of the fault and the fault section indicated by the fault indicator; acquiring switch action information of adjacent fault sections from the distribution network automation web system and fault signal information from the main network system; comprehensively assessing the accuracy of the fault section by integrating information from the three systems; determining the possible fault type within the fault section using the instantaneous transient waveform; and determining the actual fault location and type based on the fault section and fault type. This invention, by comprehensively assessing the fault section using information from three systems—the fault indicator, the distribution network automation web system, and the main station system—avoids errors in fault indicator-induced troubleshooting directions and improves troubleshooting efficiency by combining fault type information with the overall fault identification process.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power distribution network fault monitoring, and particularly relates to a power distribution overhead line fault type judgment and positioning method, system, device and storage medium. BACKGROUND

[0002] With the development of economic society, the demand and dependence of social production and people's life on electricity are getting larger and larger, and electricity has become an indispensable energy in human life, work and study. As an important part of the entire power distribution network system, the power distribution line directly undertakes the power supply task of various users, and its reliable power supply capacity and quality are particularly important. The current power distribution overhead line has been widely used in transient recording type fault indicators and automatic switches. When a fault occurs, the power workers find the fault according to the line section sent by the fault indicator.

[0003] However, only according to the information sent by the fault indicator to find the fault section, the fault type is not clear, which leads to low fault finding efficiency, and when the fault indicator fails, the finding direction may be wrong. SUMMARY

[0004] Therefore, the present application aims to solve the problem of low finding efficiency and possible wrong finding direction when using the fault indicator to find the fault of the power distribution overhead line.

[0005] In order to solve the above technical problems, the present application provides the following technical solutions:

[0006] In the first aspect, the present application provides a power distribution overhead line fault type judgment and positioning method, comprising the following steps:

[0007] Obtaining the fault transient waveform at the moment of permanent fault of the power distribution overhead line and the fault section sent by the fault indicator;

[0008] Obtaining the switch action information of the adjacent section of the fault section from the power distribution automation web system and obtaining the fault signal information from the main network system;

[0009] Comprehensively judging whether the fault section is the section where the fault may actually occur according to the switch action information of the adjacent section and the fault signal information, and if so, continuing the following steps;

[0010] Judging the type of fault that may occur in the fault section by using the fault transient waveform;

[0011] Based on the fault section and the fault type, the actual fault of the power distribution overhead line is investigated to determine the actual fault position and type.

[0012] Furthermore, the transient waveform at the moment of the fault is used to determine the possible fault type within the faulty section, specifically including:

[0013] Establish a historical transient waveform database based on historical waveforms and corresponding fault types;

[0014] Match the transient waveform at the moment of the fault with the historical transient waveform database;

[0015] The fault type corresponding to the matched historical waveform is taken as the possible fault type within the fault section.

[0016] Furthermore, after investigating the actual faults occurring on overhead power lines based on the fault section and fault type to determine the actual fault location and type, the process also includes:

[0017] The transient waveform at the moment of the fault and the actual fault type are stored in the historical transient waveform database.

[0018] Furthermore, if the transient waveform at the moment of the fault does not match any historical waveform in the historical transient waveform database, the following steps are performed:

[0019] Save the transient waveform at the moment of the fault in the historical transient waveform database;

[0020] Locate the actual location of the fault on the overhead power distribution line and determine the type of fault;

[0021] The fault type is saved in the historical transient waveform database and is saved in correspondence with the already saved fault instantaneous transient waveform.

[0022] Secondly, the present invention provides a system for determining and locating fault types in overhead power distribution lines, comprising:

[0023] The fault section judgment unit is used to acquire the transient waveform of the fault moment when a permanent fault occurs in the overhead power distribution line and the fault section indicated by the fault indicator; acquire the switching action information of the adjacent sections of the fault section from the distribution network automation web system and acquire the fault signal information from the main network system; and comprehensively judge whether the fault section is a section that may actually be faulty based on the switching action information of the adjacent sections and the fault signal information. If so, continue to the subsequent steps.

[0024] The fault type determination unit is used to determine the type of fault that may occur in the fault section by using the transient waveform at the moment of the fault.

[0025] The fault diagnosis unit is used to investigate the actual faults that occur on the overhead power distribution lines based on the fault section and fault type, thereby determining the actual fault location and type.

[0026] Furthermore, in the fault type determination unit, the possible fault types within the fault section are determined using the transient waveform at the moment of the fault, specifically including:

[0027] Establish a historical transient waveform database based on historical waveforms and corresponding fault types;

[0028] Match the transient waveform at the moment of the fault with the historical transient waveform database;

[0029] The fault type corresponding to the matched historical waveform is taken as the possible fault type within the fault section.

[0030] Furthermore, after the actual fault location and type are determined, the fault type determination unit is also used for:

[0031] The transient waveform at the moment of the fault and the actual fault type are stored in the historical transient waveform database.

[0032] Furthermore, in the fault type determination unit, if the transient waveform at the moment of the fault does not match any historical waveform in the historical transient waveform database, the following steps are performed:

[0033] Save the transient waveform at the moment of the fault in the historical transient waveform database;

[0034] Locate the actual location of the fault on the overhead power distribution line and determine the type of fault;

[0035] The fault type is saved in the historical transient waveform database and is saved in correspondence with the already saved fault instantaneous transient waveform.

[0036] Thirdly, the present invention provides a device for determining and locating fault types in overhead power distribution lines, the device comprising a processor and a memory:

[0037] The memory is used to store computer programs and send the instructions of the computer programs to the processor;

[0038] The processor executes, according to the instructions of the computer program, a method for determining and locating fault types in overhead power distribution lines, as described in the first aspect.

[0039] Fourthly, the present invention provides a computer storage medium on which a computer program is stored, and when the computer program is executed by a processor, it implements a method for determining and locating fault types of overhead power distribution lines as described in the first aspect.

[0040] In summary, this invention provides a method, system, device, and storage medium for determining and locating fault types in overhead distribution lines. The method includes acquiring the instantaneous transient waveform of the fault and the fault section indicated by the fault indicator; acquiring switch action information of adjacent fault sections from the distribution network automation web system and fault signal information from the main network system; comprehensively determining whether the fault section is a section where a fault may actually occur by combining information from the three systems; if so, determining the possible fault type within the fault section using the instantaneous transient waveform; and investigating the actual fault on the overhead distribution line based on the fault section and fault type to determine the actual fault location and type. This invention, by comprehensively determining the fault section using information from three systems—the fault indicator, the distribution network automation web system, and the main station system—avoids the problem of incorrect investigation direction due to fault indicator errors, and improves investigation efficiency by combining the investigation with fault type information. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A flowchart of a method for determining and locating fault types in overhead power distribution lines provided in an embodiment of the present invention;

[0043] Figure 2 A flowchart illustrating fault type determination and location provided in an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0045] With economic and social development, the demand for and dependence on electricity in social production and people's lives are increasing, and electricity has become an indispensable energy source for human life, work, and study. As a crucial component of the entire power distribution network system, distribution lines directly bear the power supply tasks for various users, making their reliable power supply capacity and quality particularly important. Currently, transient waveform fault indicators and automated switches are widely used on overhead distribution lines. When a fault occurs, power workers locate the faulty section based on the fault indicator's indication.

[0046] However, relying solely on information from the fault indicator to locate the faulty section is inefficient because the fault type is unclear, and the search direction may be incorrect if the fault indicator malfunctions.

[0047] Based on this, the present invention provides a method, system, device and storage medium for judging and locating fault types of overhead power distribution lines.

[0048] The following is a detailed description of an embodiment of the method for judging and locating fault types in overhead power distribution lines according to the present invention.

[0049] Please see Figure 1 This embodiment provides a method for determining and locating fault types in overhead power distribution lines, including:

[0050] S100: Acquire the transient waveform of the fault moment when a permanent fault occurs in the overhead power distribution line and the fault section indicated by the fault indicator.

[0051] A fault indicator is a device installed on power lines (overhead lines, cables, and busbars) to indicate fault current. Most fault indicators can only identify and indicate short-circuit faults by detecting the characteristics of the short-circuit current. The transient waveform and fault section at the moment of the fault can be directly obtained from the information emitted by the fault indicator.

[0052] S200: Obtains switch action information of adjacent sections of the faulty section from the distribution network automation web system and obtains fault signal information from the main network system.

[0053] By retrieving the SOE information of adjacent sections in the distribution network automation web system at the time of the fault, the system determines whether the switches in the adjacent sections operated correctly based on the SOE information. The main network system reflects the SOE operation information of the substation outgoing switches; if a line fault occurs, the main network system will report the corresponding fault signal.

[0054] S300: Based on the switching action information and fault signal information of adjacent sections, determine whether the faulty section is a section that may actually be faulty. If so, continue with the subsequent steps.

[0055] In some cases, such as when the switch in the faulty section is a voltage-time type switch, it is impossible to determine whether the faulty area is before or after this switch based solely on its operation. In such cases, further judgment can be made by combining the operation data of switches in adjacent sections. This judgment process is well-known in the art and will not be elaborated upon here.

[0056] In addition, by utilizing fault signal information from the main network system, it is possible to determine whether a grounding fault has occurred on the line. After ruling out these possibilities, it can be comprehensively determined that the fault section indicated by the fault indicator is correct.

[0057] S400: Use transient waveforms at the moment of a fault to determine the type of fault that may occur in the fault section.

[0058] In an optional embodiment, the process for determining the possible fault type is as follows:

[0059] A historical transient waveform database is established based on historical waveforms and corresponding fault types.

[0060] That is, a historical transient waveform library is established based on historical waveforms and corresponding fault types (tree obstruction, insulator bursting, surge arrester bursting, external construction accidentally touching the conductor, hanging objects on the conductor, small animals accidentally touching, transformer fault, metering device fault, and line breakage).

[0061] The transient waveform at the moment of the fault is matched with the historical transient waveform database.

[0062] Specifically, the similarity between the transient waveform at the moment of the fault and each waveform in the historical transient waveform database is calculated. If the similarity is greater than a set threshold, the waveforms are considered to match. If no waveform matches, the transient waveform at the moment of the fault is temporarily saved. After the fault is investigated, the identified fault type is matched with the transient waveform at the moment of the fault and then saved in the historical transient waveform database.

[0063] The fault type corresponding to the matched historical waveform is taken as the possible fault type within the fault section.

[0064] S500: Based on the fault section and fault type, investigate the actual faults that occur on the overhead power distribution line to determine the actual fault location and type.

[0065] In addition, after determining the actual fault location and type, the transient waveform at the moment of the fault and the actual fault type can be saved in the historical transient waveform database. Figure 2 A flowchart illustrating the overall process for fault type identification and localization.

[0066] The above method will be introduced below using an actual fault on a certain line as an example.

[0067] On the morning of April 1, 2022, the power supply station received a fault report from the dispatch center: "Fault Alert: At 07:41 on April 1, a 10kV line / branch / shangmou jiedian / pole-mounted switch / 10kV line #58 pole 58T3 switch FTU at a certain substation experienced overcurrent operation, and reclosing failed." Simultaneously, the fault indicator issued the message: "AB phase permanent short circuit substation: line at a certain station: section of a certain line: between pole #37 and tower #45 of the shangmou jiedian branch line 2022-04-01 07:41:05." Based on this, the fault section was determined to be between pole #37 and tower #45 of the shangmou jiedian branch line.

[0068] By checking the fault time on a certain 10kV line and consulting the distribution network automation web system, it was found that the section downstream of the 58T3 switch FTU on pole #58 of the 10kV line is the upper branch line. The 58T3 switch on pole #58 of the 10kV line is a current-type automatic switch with an overcurrent II stage setting of 324A and a time of 0.05 seconds. The reclosing time is set to 10 seconds. Based on the SOE information from the distribution network automation web system, the switch action was determined to be correct, and the fault section was determined to be the upper branch line. However, the 40T1 switch on pole #40 of the same branch line on the same 10kV line is a voltage-time type switch, and it is impossible to distinguish whether the fault area is before or after this switch. Therefore, the fault section determined through the distribution network automation web system is the entire 10kV line of the same branch line. This confirms that the fault section of the fault indicator system is correct.

[0069] By checking the main grid system's operation at the time of the fault, the main grid system reflects the SEE operation information of the substation's outgoing line switches. Since the grounding method of the 10kV outgoing line of Fengmou substation is through the arc suppression coil, if a grounding occurs on the line, the main grid system will report "arc suppression device grounding action", or "grounding alarm action" or "small resistor activation action". However, none of these three signals were reported at the time of the fault, indicating that the fault was not grounding. The 58T3 switch on pole #58 of a certain 10kV line isolated the fault point by disconnecting the switch. Therefore, it was determined that the fault section was the entire branch line of a certain 10kV line.

[0070] Combining the three systems, the faulty section can be determined to be from pole #37 of a certain branch line to tower #45 of a certain branch line.

[0071] On the other hand, the fault transient waveform of the fault indicator was obtained. Through waveform analysis, the waveforms of phase A and phase B were out of phase, the zero-sequence current was very low, and the maximum absolute value of the fault current amplitude was 930A, corresponding to an effective value of 657A, which was greater than the protection setting of the 58T3 switch on pole #58 of a certain 10kV line, causing the 58T3 switch on pole #58 of a certain 10kV line to trip. However, the amplitude of the voltage waveform of the fault phase decreased, while the amplitude of the voltage waveform of the non-faulty phase increased, and the waveform was not distorted. Comparison with the historical transient waveform database of the fault indicator revealed that it was similar to the waveform of pole 80 of the Renmou branch line of a certain 10kV Nanmou line on February 7, 2021. At that time, the fault type was tree fault. Therefore, it was concluded that the current fault type was likely tree fault. Meanwhile, based on the fault location, at 10:19 AM, it was discovered that a withered pine tree had fallen outside the row of poles #12-#13 on a certain 10kV line. The Tian branch line is T-connected to pole #38 of the Shang branch line, which falls within the section from pole #37 to tower #45 of the Shang branch line. After isolating the fault point, power was successfully restored to the non-faulty section. After determining the actual cause of the fault, the historical transient waveform library was further improved based on the waveform.

[0072] This embodiment provides a method for determining and locating fault types in overhead distribution lines. The method includes acquiring the instantaneous transient waveform of the fault and the fault section indicated by the fault indicator; acquiring switch action information of adjacent fault sections from the distribution network automation web system and fault signal information from the main network system; comprehensively determining whether the fault section is a section where a fault may actually occur by combining information from the three systems; if so, determining the possible fault type within the fault section using the instantaneous transient waveform; and investigating the actual fault on the overhead distribution line based on the fault section and fault type to determine the actual fault location and type. This invention, by comprehensively determining the fault section using information from three systems—the fault indicator, the distribution network automation web system, and the main station system—avoids the problem of incorrect investigation direction due to fault indicator errors, and improves investigation efficiency by combining the investigation with fault type information.

[0073] The above is a detailed description of an embodiment of a method for judging and locating fault types of overhead power distribution lines according to the present invention. The following will provide a detailed description of an embodiment of a system for judging and locating fault types of overhead power distribution lines according to the present invention.

[0074] This embodiment provides a system for determining and locating fault types in overhead power distribution lines, including:

[0075] The fault section judgment unit is used to acquire the transient waveform of the fault moment when a permanent fault occurs in the overhead power distribution line and the fault section indicated by the fault indicator; acquire the switching action information of the adjacent sections of the fault section from the distribution network automation web system and acquire the fault signal information from the main network system; and comprehensively judge whether the fault section is a section that may actually be faulty based on the switching action information of the adjacent sections and the fault signal information. If so, continue to the subsequent steps.

[0076] The fault type determination unit is used to determine the type of fault that may occur in the fault section by using the transient waveform at the moment of the fault.

[0077] Specifically, determining the possible fault type within the fault section using transient waveforms at the moment of the fault includes:

[0078] Establish a historical transient waveform database based on historical waveforms and corresponding fault types;

[0079] Match the transient waveform at the moment of the fault with the historical transient waveform database;

[0080] The fault type corresponding to the matched historical waveform is taken as the possible fault type within the fault section.

[0081] In addition, in the fault type determination unit, if the transient waveform at the moment of the fault does not match any historical waveform in the historical transient waveform database, the following steps are performed:

[0082] Save the transient waveform at the moment of the fault in the historical transient waveform database;

[0083] Locate the actual location of the fault on the overhead power distribution line and determine the type of fault;

[0084] The fault type is saved in the historical transient waveform database and is saved in correspondence with the already saved fault instantaneous transient waveform.

[0085] The fault diagnosis unit is used to investigate the actual faults that occur on the overhead power distribution lines based on the fault section and fault type, thereby determining the actual fault location and type.

[0086] After the actual fault location and type are determined, the fault type judgment unit is also used to store the corresponding transient waveform at the moment of the fault and the actual fault type in the historical transient waveform database.

[0087] The above is a detailed description of an embodiment of a fault type judgment and location system for overhead power distribution lines according to the present invention. The following will provide a detailed description of an embodiment of a fault type judgment and location device for overhead power distribution lines according to the present invention.

[0088] This embodiment provides a device for determining and locating fault types in overhead power distribution lines. The device includes a processor and a memory.

[0089] The memory is used to store computer programs and send the instructions of the computer programs to the processor;

[0090] The processor executes a method for determining and locating fault types in overhead power distribution lines, as described in the foregoing embodiments, according to instructions from a computer program.

[0091] The above is a detailed description of an embodiment of a fault type judgment and location device for overhead power distribution lines according to the present invention. The following will provide a detailed description of an embodiment of a computer storage medium according to the present invention.

[0092] This embodiment provides a computer storage medium on which a computer program is stored. When the computer program is executed by a processor, it implements a method for determining and locating fault types of overhead power distribution lines as described in the foregoing embodiment.

[0093] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for fault type determination and location of an electric power distribution overhead line, characterized in that, The method comprises the following steps: acquiring a fault transient waveform at a fault moment when a permanent fault occurs in a power distribution overhead line and a fault section sent by a fault indicator; acquiring switch action information of adjacent sections of the fault section from a power distribution automation web system and acquiring fault signal information from a main grid system; comprehensively judging whether the fault section is a section in which a fault is actually likely to occur according to the switch action information of the adjacent sections and the fault signal information, and if so, continuing the following steps; judging a fault type likely to occur in the fault section by using the fault transient waveform; investigating an actual fault occurring in the power distribution overhead line based on the fault section and the fault type, so as to determine an actual fault position and type; judging a fault type likely to occur in the fault section by using the fault transient waveform, specifically comprising: establishing a historical transient waveform database according to historical waveforms and corresponding fault type classifications; matching the fault transient waveform in the historical transient waveform database; taking a fault type corresponding to the matched historical waveform as the fault type likely to occur in the fault section.

2. The method of claim 1, wherein, After investigating the actual fault occurring in the power distribution overhead line based on the fault section and the fault type, so as to determine the actual fault position and type, the method further comprises: saving the fault transient waveform and the actual fault type in the historical transient waveform database.

3. The method of claim 1, wherein, If the fault transient waveform does not match any historical waveform in the historical transient waveform database, the following steps are performed: saving the fault transient waveform in the historical transient waveform database; finding an actual fault occurrence position of the power distribution overhead line according to the fault position and determining a fault type; saving the fault type in the historical transient waveform database and corresponding to the fault transient waveform that has been saved.

4. A power distribution overhead line fault type determination and location system, characterized by, The method comprises: a fault section judging unit, configured to acquire a fault transient waveform at a fault moment when a permanent fault occurs in a power distribution overhead line and a fault section sent by a fault indicator; acquire switch action information of adjacent sections of the fault section from a power distribution automation web system and acquire fault signal information from a main grid system; comprehensively judge whether the fault section is a section in which a fault is actually likely to occur according to the switch action information of the adjacent sections and the fault signal information, and if so, continue the following steps; a fault type judging unit, configured to judge a fault type likely to occur in the fault section by using the fault transient waveform; a fault investigating unit, configured to investigate an actual fault occurring in the power distribution overhead line based on the fault section and the fault type, so as to determine an actual fault position and type; in the fault type judging unit, the fault type likely to occur in the fault section is judged by using the fault transient waveform, specifically comprising: establishing a historical transient waveform database according to historical waveforms and corresponding fault type classifications; matching the fault transient waveform in the historical transient waveform database; The matched historical waveform corresponds to a fault type, which is the possible fault type in the fault section.

5. The electric distribution overhead line fault type determination and location system of claim 4, wherein, After the actual fault location and type are determined, the fault type judging unit is further configured to: Save the fault transient waveform and the actual fault type in the historical transient waveform database.

6. The electric distribution overhead line fault type determination and location system of claim 4, wherein, In the fault type judging unit, if the fault transient waveform does not match any historical waveform in the historical transient waveform database, the following steps are performed: Save the fault transient waveform in the historical transient waveform database; According to the fault location, find the actual fault location of the overhead distribution line and determine the fault type; Save the fault type in the historical transient waveform database and correspondingly save the fault transient waveform.

7. A power distribution overhead line fault type determination and location apparatus, characterized by, The device comprises a processor and a memory: The memory is configured to store a computer program and send instructions of the computer program to the processor; The processor executes the instructions of the computer program to perform the method of any one of claims 1-3.

8. A computer storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the method of any one of claims 1-3. The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the method of any one of claims 1-3.

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