Fault location method, device and system for transmission network, processor, and electronic device

Abstract

The present invention discloses a method, device and system, processor and electronic device for locating a fault in a power transmission network. The method comprises: obtaining detection points on a plurality of transmission lines in the power transmission network, wherein the detection points are determined based on pre-configured segmented positioning information; obtaining power information of each detection point, wherein the power information comprises at least one of the following: zero-sequence voltage and zero-sequence current; judging whether the detection point is a fault node based on the power information; if the detection point is the fault node, determining the fault location of the power fault based on the positioning of the fault node on the transmission line. The present invention solves the technical problem that the detection efficiency of the fault location method for the transmission line in the power transmission network in the prior art is low, resulting in low efficiency of fault location in the power transmission network.

Description

Technical Field

[0001] The present invention relates to the technical field of fault location of a power transmission network, and in particular to a method, device and system, processor and electronic equipment for locating a fault of a power transmission network. Background Art

[0002] With more and more transmission lines, tower and line failures caused by various factors are becoming more and more frequent, and the direct or indirect economic losses caused by this are also getting higher and higher. Under the current situation where the transmission line operation and maintenance personnel are relatively limited, how to effectively, correctly and timely grasp the operation status of the transmission lines in the management area, quickly locate the problematic towers and transmission lines, and analyze and classify the fault types is of great significance to preventing major power outages and reducing the workload of operation and maintenance personnel.

[0003] At present, the operation, inspection and maintenance of poles and towers at home and abroad mainly focus on using various mobile carriers and detection equipment on the carriers to analyze and judge the status of poles and lines in the form of images, graphs and other data. Generally, data is collected in a centralized manner and analyzed and processed afterwards. The amount of information is huge, but effective information is little. There is a general lack of effective data analysis and processing methods, so there is no correct and effective grasp of the operating status of the poles and lines under their jurisdiction.

[0004] In the prior art, various detection equipment is installed on the towers to realize online monitoring of the operating status of the towers and lines. The detection objects are generally collected images, graphs and other data. The fault location method for the transmission line in the transmission network is to use traveling wave ranging for detection. Since this method has low detection efficiency, it leads to the technical problem of low efficiency of transmission network fault location.

[0005] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0006] The embodiments of the present invention provide a method, device and system, processor and electronic device for locating a fault in a power transmission network, so as to at least solve the technical problem that the fault locating method for a power transmission line in a power transmission network in the prior art has low detection efficiency, resulting in low efficiency of locating the fault in the power transmission network.

[0007] According to one aspect of an embodiment of the present invention, a fault location method for a power transmission network is provided, comprising: obtaining detection points on a plurality of transmission lines on the power transmission network, wherein the detection points are determined based on pre-configured segmented location information; obtaining power information of each detection point, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; based on the power information, determining whether the detection point is a fault node; if the detection point is the fault node, determining the fault location of the power fault based on the location of the fault node on the transmission line.

[0008] Optionally, a collection device is installed at each detection point on multiple transmission lines on the above-mentioned transmission network, and the above-mentioned collection device includes: a voltage component for collecting three-phase voltage and zero-sequence voltage and a current component for collecting three-phase current.

[0009] Optionally, obtaining the power information of each detection point includes: obtaining the above-mentioned zero-sequence voltage and three-phase current of each of the above-mentioned detection points on the above-mentioned transmission line; synthesizing the above-mentioned three-phase currents to obtain the zero-sequence current; performing analog-to-digital conversion on the above-mentioned zero-sequence voltage and the above-mentioned zero-sequence current signals to generate digital signals.

[0010] Optionally, based on the above-mentioned power information, determine whether the above-mentioned detection point is a fault node, including: determine whether the instantaneous value of the zero-sequence voltage collected at the above-mentioned detection point at the first moment reaches the set starting value; if reached, start recording with the above-mentioned first moment as the starting time, and obtain the first recording result within a predetermined period, wherein the above-mentioned first recording result includes: a first number of cycles generated before the above-mentioned first moment and a second number of cycles generated after the above-mentioned first moment; use an intelligent fusion algorithm to analyze the above-mentioned first recording result to determine whether the above-mentioned detection point has a fault, wherein the above-mentioned intelligent fusion algorithm includes at least one of the following: transient HHT algorithm, EMD algorithm, transient energy algorithm and first half-wave algorithm.

[0011] Optionally, the fault location of the power fault is determined based on the positioning of the fault node on the transmission line, including: obtaining first location information of the fault node and second location information of the next detection point after the fault node; obtaining the fault location on the transmission line, wherein the fault location is on the line section between the first location information and the second location information.

[0012] Optionally, after determining the fault location of the power fault based on the positioning of the fault node on the transmission line, the method further includes: acquiring power information of each distribution branch line in the substation, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; determining the distribution branch line where the power fault occurs and the location information of the distribution branch line based on the power information of each distribution branch line; and correcting the fault location by comparing the location information of the distribution branch line where the power fault occurs with the fault location of the power fault determined by positioning.

[0013] Optionally, a current line selection device is set in the above-mentioned substation, and the above-mentioned current line selection device includes: a voltage component set on the distribution bus of the above-mentioned substation for obtaining three-phase voltage and zero-sequence voltage, and a current component set on the distribution branch line of the above-mentioned substation for obtaining three-phase current and position zero-sequence current.

[0014] Optionally, power information of each distribution branch line in the substation is obtained, including: obtaining the zero-sequence voltage on each distribution bus in the substation, and the zero-sequence current on each distribution branch line drawn from the substation; performing analog-to-digital conversion on the zero-sequence voltage on each distribution bus and the zero-sequence current on each distribution branch line.

[0015] Optionally, based on the power information of the above-mentioned each distribution branch line, the distribution branch line where the power fault occurs and the location information of the distribution branch line are determined, including: judging whether the instantaneous value of the zero-sequence voltage on each distribution bus collected at the second moment reaches the set starting value; if reached, starting recording with the above-mentioned second moment as the starting time, and obtaining the second recording result within a predetermined period, wherein the above-mentioned second recording result includes: a third number of cycles generated before the above-mentioned second moment and a fourth number of cycles generated after the above-mentioned second moment; using an intelligent fusion algorithm to analyze the above-mentioned second recording result to determine the distribution branch line where the above-mentioned power fault occurs, wherein the above-mentioned intelligent fusion algorithm includes at least one of the following: transient HHT algorithm, EMD algorithm, transient energy algorithm and first half-wave algorithm.

[0016] Optionally, if the detection results of multiple detection points on multiple distribution lines all indicate that there is a power fault, the distribution branch line in the substation where the power fault is detected is treated as the faulty line, and the fault results on other lines are treated as misjudgments.

[0017] According to another aspect of an embodiment of the present invention, a fault location system for a power transmission network is provided, the location system comprising: a plurality of transmission lines constituting the power transmission network; a collection device installed at a detection point on each transmission line, for collecting power information of each detection point, wherein the power information comprises at least one of the following: zero-sequence voltage and zero-sequence current; a fault location device communicating with the collection device, for determining a fault location causing a power fault based on the power information.

[0018] Optionally, a collection device is installed at each detection point on multiple transmission lines on the above-mentioned transmission network, and the above-mentioned collection device includes: a voltage component for collecting three-phase voltage and zero-sequence voltage and a current component for collecting three-phase current.

[0019] Optionally, the acquisition device comprises: a voltage detection device for obtaining the zero-sequence voltage of each of the detection points on the transmission line; a current detection device for obtaining the three-phase current of each of the detection points on the transmission line; a synthesis device connected to the current detection device for synthesizing the three-phase current to obtain the zero-sequence current; and a digital-to-analog conversion device for performing analog-to-digital conversion on the zero-sequence voltage and the zero-sequence current signals.

[0020] Optionally, the fault location device includes: a recording device, used to obtain a first recording result within a predetermined period with a first moment as the starting time; and an analysis device, connected to the recording device, used to determine whether a fault occurs at the detection point based on the first recording result.

[0021] Optionally, the fault location system further includes: a first locator arranged on the fault node, for obtaining first location information of the fault node; a second locator arranged at the next detection point after the fault node, for obtaining second location information; wherein the fault location is on the line section between the first location information and the second location information.

[0022] Optionally, the fault location system further includes: a second acquisition device, installed on each distribution branch line in the substation, for collecting power information of each distribution branch line in the substation, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; an analysis device, connected to the second acquisition device, for determining the distribution branch line where the power fault occurs and the location information of the distribution branch line based on the power information of each distribution branch line; a corrector, for completing the correction of the fault location by comparing the location information of the distribution branch line where the power fault occurs with the fault location of the power fault determined by positioning.

[0023] Optionally, the fault location system further includes: a current line selection device, arranged in the substation, wherein the current line selection device includes: a voltage component arranged on the distribution bus of the substation for obtaining three-phase voltage and zero-sequence voltage, and a current component arranged on the distribution branch line of the substation for obtaining three-phase current and position zero-sequence current.

[0024] According to another aspect of an embodiment of the present invention, a fault locating device for a power transmission network is provided, comprising: a first acquisition module, used to acquire detection points on a plurality of transmission lines on the power transmission network, wherein the detection points are determined based on pre-configured segmented positioning information; a second acquisition module, used to acquire power information of each detection point, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; a judgment module, used to judge whether the detection point is a fault node based on the power information; and a positioning module, used to determine the fault location of the power fault based on the positioning of the fault node on the transmission line if the detection point is the fault node.

[0025] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is further provided. The non-volatile storage medium stores a plurality of instructions. The instructions are suitable for being loaded by a processor and executing any one of the above-mentioned fault location methods.

[0026] According to another aspect of an embodiment of the present invention, a processor is further provided, and the processor is used to run a program, wherein the program is configured to execute any one of the above-mentioned fault locating methods when running.

[0027] According to another aspect of an embodiment of the present invention, there is further provided an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute any one of the above-mentioned fault location methods.

[0028] In an embodiment of the present invention, by acquiring detection points on a plurality of transmission lines on a transmission network, wherein the detection points are determined based on pre-configured segmented positioning information; acquiring power information of each detection point, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; judging whether the detection point is a fault node based on the power information; if the detection point is the fault node, determining the fault location of the power fault based on the positioning of the fault node on the transmission line, the purpose of improving the detection efficiency of fault positioning of the transmission line in the transmission network is achieved, thereby achieving the technical effect of improving the fault positioning efficiency of the transmission network, and further solving the technical problem in the prior art that the detection efficiency of the fault positioning method for the transmission line in the transmission network is low, resulting in low transmission network fault positioning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 is a flow chart of a method for locating a fault in a transmission network according to an embodiment of the present invention;

[0031] Figure 2 is a structural schematic diagram of a fault location system for a power transmission network according to an embodiment of the present invention;

[0032] Figure 3 It is a structural schematic diagram of a fault location device for a power transmission network according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] Example 1

[0036] According to an embodiment of the present invention, an embodiment of a fault location method for a power transmission network is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0037] In the relevant field of the present application, the problem of locating single-phase grounding faults has long troubled the operation department. At present, on-site staff often determine the fault section by trial pulling the line method, that is, first disconnect the outgoing circuit breaker of the faulty line in the substation, then disconnect the sectionalizer in the middle of the line, and finally reclose the outgoing circuit breaker of the substation. If no fault occurs, it means that the fault point is behind the sectionalizer, and so on. Each time the switch is opened and closed, it will cause an impact on the power grid, which is prone to operating overvoltage and resonant overvoltage. Frequent switching operations will also reduce the service life of the switch. For unmanned substations, remote control operation is required, which increases the burden on the equipment. Therefore, fast and accurate fault location technology is conducive to maintaining power grid equipment, improving the service life of equipment, and reducing the burden of maintenance and repair.

[0038] In summary, the single-phase grounding fault location technology of the small current grounding system can improve the reliability of power supply, improve the economic benefits of the power supply department and users, and maintain the power grid equipment, which is of great significance. The implementation of distribution automation is the fundamental guarantee for solving the current problems of the transmission network, and the fault location of the transmission network is one of the key technologies of distribution automation. How to quickly and accurately locate the fault of the transmission network plays an important role in the economic and reliable operation of the transmission network system. However, there are many methods for fault location, and the positioning results obtained are different. Therefore, it is necessary to study the method of transmission network fault handling performance test to ensure the accuracy of fault location, which not only ensures the safety, stability and economic operation of the power grid, but also helps to promote the use of new energy technologies in the power system, and can improve the social and economic benefits of the power supply department and users. It is of great significance to the safe production of the power system.

[0039] Figure 1 is a flow chart of a method for locating a fault in a transmission network according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0040] Step S102, obtaining detection points on a plurality of transmission lines on the transmission network, wherein the detection points are determined based on pre-configured segment positioning information;

[0041] Step S104, obtaining power information of each detection point, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current;

[0042] Step S106, based on the power information, determining whether the detection point is a faulty node;

[0043] Step S108: If the detection point is the fault node, the fault location where the power fault occurs is determined based on the location of the fault node on the transmission line.

[0044] In an embodiment of the present invention, by acquiring detection points on a plurality of transmission lines on a transmission network, wherein the detection points are determined based on pre-configured segmented positioning information; acquiring power information of each detection point, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; judging whether the detection point is a fault node based on the power information; if the detection point is the fault node, determining the fault location of the power fault based on the positioning of the fault node on the transmission line, the purpose of improving the detection efficiency of fault positioning of the transmission line in the transmission network is achieved, thereby achieving the technical effect of improving the fault positioning efficiency of the transmission network, and further solving the technical problem in the prior art that the detection efficiency of the fault positioning method for the transmission line in the transmission network is low, resulting in low transmission network fault positioning efficiency.

[0045] In order to solve the technical problems existing in the prior art, the embodiments of the present application provide a fault location method for a transmission network, which is essentially a single-phase grounding fault location method for a distribution overhead cable hybrid line, and can significantly improve the accuracy and speed of locating a one-way grounding fault in a distribution line.

[0046] The fault location method of the transmission network provided in the embodiment of the present application can be, but is not limited to, applicable to the transmission operation scenario of laying grounding lines on transmission towers at voltage levels of 110kv and above. The grounding current is collected through the tower grounding lead, and the big data formed by the grounding current along the line is analyzed and classified using an intelligent fusion algorithm to effectively locate the fault line and tower, and classify various faults of the tower.

[0047] The intelligent fusion algorithm includes at least one of the following: transient HHT algorithm, EMD algorithm, transient energy algorithm and first half-wave algorithm.

[0048] In an embodiment of the present application, based on pre-configured segmented positioning information, detection points on multiple transmission lines on the transmission network are determined, and power information of each detection point, for example, zero-sequence voltage and zero-sequence current, is obtained respectively; then, based on the above power information, it can be determined whether the above detection point is a fault node; if the judgment result is yes, the fault location where the power fault occurs is determined based on the positioning of the above fault node on the above transmission line.

[0049] In the embodiment of the present application, the monitoring unit can be clamped on each tower grounding cable of one or more lines by using a communication link but is not limited to it; the background and the monitoring unit communicate and test and synchronize the time; the grounding current of each grounding line is actively measured multiple times in a time-sharing manner to form basic data of the line and the area; when lightning strikes, single-phase grounding or phase-to-phase short circuits occur, the electrical induction principle will cause instantaneous disturbances in the grounding current near the fault point, triggering the monitoring unit to measure, record and transmit this set of values; the background uses algorithms to calculate reference accident points and accident types.

[0050] It is still necessary to explain that the above-mentioned transmission network fault location method in the embodiment of the present application can be implemented in the transmission network fault location system provided in the embodiment of the present application. The present invention collects a numerical data set of relative changes in the grounding current of the transmission tower, continuously iterates and optimizes the basic data, and continuously optimizes the algorithm, and finally forms a transmission line fault location system that is easy to implement, low-cost, accurate in measurement, and has advance warning value.

[0051] In the embodiment of the present application, the above-mentioned fault location system is equipped with a composite sensor that can measure ground leakage current, high-frequency pulse current, and induced lightning current, and has a monitoring unit that combines electromagnetic induction measurement, long-range and short-range communication, and battery combined with solar power drive. The monitoring unit is distributed on each transmission tower in the monitoring area, and has a background database and application with storage, analysis and alarm functions.

[0052] In an optional embodiment, obtaining power information of each detection point includes:

[0053] Step S202, obtaining the zero-sequence voltage and three-phase current of each of the detection points on the transmission line;

[0054] Step S204, synthesizing the above three-phase currents to obtain a zero-sequence current;

[0055] Step S206, performing analog-to-digital conversion on the zero-sequence voltage and the zero-sequence current signals to generate digital signals.

[0056] In an optional embodiment, a collection device is installed on each detection point on multiple transmission lines on the above-mentioned transmission network, and the above-mentioned collection device includes: a voltage component for collecting three-phase voltage and zero-sequence voltage and a current component for collecting three-phase current.

[0057] In an embodiment of the present application, the zero-sequence voltage and three-phase current at each node position on each transmission line collected by a collection device are obtained, the three-phase currents are synthesized to obtain the zero-sequence current, and the above zero-sequence voltage and zero-sequence current signals are converted from analog to digital to generate a digital signal.

[0058] In an optional embodiment, judging whether the detection point is a faulty node based on the power information includes:

[0059] Step S302, determining whether the instantaneous value of the zero-sequence voltage at the detection point collected at the first moment reaches a set starting value;

[0060] Step S304, if reached, start recording with the first moment as the starting time, and obtain the first recording result within a predetermined period, wherein the first recording result includes: a first number of cycles generated before the first moment and a second number of cycles generated after the first moment;

[0061] Step S306, using an intelligent fusion algorithm to analyze the first recording result to determine whether a fault occurs at the detection point, wherein the intelligent fusion algorithm includes at least one of the following: a transient HHT algorithm, an EMD algorithm, a transient energy algorithm, and a first half-wave algorithm.

[0062] In an embodiment of the present application, it is determined whether the instantaneous value of the zero-sequence voltage collected at the above-mentioned detection point at the first moment T1 reaches the set starting value; when the instantaneous value of the zero-sequence voltage reaches the set starting value, recording is started, and the two cycles before the first moment T1 and the six cycles generated after the first moment are recorded; an intelligent fusion algorithm is used to perform fault judgment based on the first recording result obtained by recording, wherein the above-mentioned intelligent fusion algorithm includes a transient HHT algorithm, an EMD algorithm, a transient energy algorithm and a first half-wave algorithm.

[0063] For example, the signal characteristics can be calculated by using, but not limited to, the formula Sn=μ1n|J1n|+μ2n|J2n|+μ3n|J3n|+μ4n|J4n|, wherein J1n, J2n, J3n, and J4n respectively represent the numerical values ​​after processing by four different signal processing methods, and μ1n, μ2n, μ3n, and μ4n respectively represent the weights of the four different signal processing methods. If the Sn value is a negative value, it is judged that there is a ground fault at the node position; if the Sn value is a positive value, it is judged that there is no ground fault at the node position.

[0064] In an optional embodiment, a collection device is installed on each detection point on multiple transmission lines on the above-mentioned transmission network, and the above-mentioned collection device includes: a voltage component for collecting three-phase voltage and zero-sequence voltage and a current component for collecting three-phase current.

[0065] In an optional embodiment, determining the fault location where the power fault occurs based on the positioning of the fault node on the transmission line includes:

[0066] Step S402, obtaining first position information of the faulty node and second position information of a next detection point after the faulty node;

[0067] Step S404, obtaining a fault location on the transmission line, wherein the fault location is on a line section between the first location information and the second location information.

[0068] In an embodiment of the present application, the first position information of the above-mentioned fault node and the second position information of the next detection point located after the above-mentioned fault node are obtained, and the final fault position is located on the line section between the first position information and the above-mentioned second position information.

[0069] In an optional embodiment, after determining the fault location where the power fault occurs based on the location of the fault node on the transmission line, the method further includes:

[0070] Step S502, obtaining power information of each distribution branch line in the substation, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current;

[0071] Step S504, based on the power information of each distribution branch line, determining the distribution branch line where the power failure occurs and the location information of the distribution branch line;

[0072] Step S506, correcting the fault location by comparing the location information of the power distribution branch line where the power fault occurs with the fault location of the power fault determined by positioning.

[0073] In an optional embodiment, a current line selection device is arranged in the above-mentioned substation, and the above-mentioned current line selection device includes: a voltage component arranged on the distribution bus of the above-mentioned substation for obtaining three-phase voltage and zero-sequence voltage, and a current component arranged on the distribution branch line of the above-mentioned substation for obtaining three-phase current and position zero-sequence current.

[0074] In an optional embodiment, obtaining power information of each distribution branch line in the substation includes:

[0075] Step S602, obtaining the zero-sequence voltage on each distribution bus in the substation and the zero-sequence current on each distribution branch line drawn from the substation;

[0076] Step S604, performing analog-to-digital conversion on the zero-sequence voltage on each of the distribution buses and the zero-sequence current on each of the distribution branches.

[0077] In an optional embodiment, based on the power information of each of the above-mentioned distribution branches, determining the distribution branch line having a power failure and the location information of the distribution branch line includes:

[0078] Step S702, determining whether the instantaneous value of the zero-sequence voltage on each distribution bus collected at the second moment reaches a set starting value;

[0079] Step S704, if reached, start recording with the second moment as the starting time, and obtain a second recording result within a predetermined period, wherein the second recording result includes: a third number of cycles generated before the second moment and a fourth number of cycles generated after the second moment;

[0080] Step S706, using an intelligent fusion algorithm to analyze the second recording result to determine the distribution branch line where the power fault occurs, wherein the intelligent fusion algorithm includes at least one of the following: transient HHT algorithm, EMD algorithm, transient energy algorithm and first half-wave algorithm.

[0081] In an optional embodiment, if the detection results of multiple detection points on multiple distribution lines all indicate that there is a power fault, the distribution branch line in the substation where the power fault is detected is treated as the faulty line, and the fault results on other lines are treated as misjudgments.

[0082] As an optional embodiment, the embodiment of the present application also includes a solution for line selection correction, which replaces the acquisition of the zero-sequence voltage on each distribution bus in the substation and the three-phase current on each distribution branch line drawn from the substation, synthesizes the three-phase current to obtain the zero-sequence current; and performs analog-to-digital conversion on the above-mentioned zero-sequence voltage and zero-sequence current signals.

[0083] In the above embodiment, by judging whether the instantaneous value of the zero-sequence voltage on each distribution bus collected at the second moment reaches the set starting value, when the instantaneous value of the zero-sequence voltage reaches the set starting value, the recording starts, and the 2 cycles before the moment T2 and the 6 cycles after T2 are recorded; and the embodiment of the present application can, but is not limited to, use one or more of the HHT algorithm, EMD algorithm, transient energy algorithm and first half-wave algorithm to judge the distribution branch line where the fault is located, and the number of the distribution branch line is compared with the number of the distribution branch line where the fault point is located.

[0084] As an optional embodiment, it is possible but not limited to recording one point per millisecond, recording 120 points in each cycle, and obtaining no less than 960 points in total.

[0085] As another optional embodiment, the weights μ1n, μ2n, μ3n, and μ4n are adaptively adjusted within the system. When the signal characteristics of a certain algorithm are obvious, the weight is increased, otherwise the weight is reduced. When the direction of the characteristic signal extracted by a certain node is opposite to the signal characteristics of other positions, the weight is increased.

[0086] The advantages and positive effects brought by the embodiments of the present application may include but are not limited to the following:

[0087] 1. By obtaining the three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current at multiple points of each pole on the distribution branch line, and through comprehensive calculation with the above three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current as parameters, the position of the unidirectional grounding fault is judged. The unidirectional grounding fault point is judged to be located between two adjacent poles on the distribution branch line. Therefore, the relatively accurate positioning of the fault position is achieved, making it easier to handle the fault in a timely manner.

[0088] 2. By introducing a fusion algorithm composed of multiple current mainstream algorithms and assigning weights to each algorithm, the effective extraction of fault characteristic signals is achieved, and the speed and accuracy of unidirectional grounding fault judgment are improved.

[0089] In order to further understand the content, features and effects of the present invention, the following embodiments are described in detail as follows:

[0090] As an optional embodiment, a method for locating a single-phase grounding fault in a power distribution overhead cable hybrid line provided by the present invention comprises the following steps:

[0091] Step S1, obtaining the zero-sequence voltage and three-phase current at each node position on each transmission line, synthesizing the three-phase current to obtain the zero-sequence current, and performing analog-to-digital conversion on the zero-sequence voltage and zero-sequence current signals.

[0092] A positioning device is installed at each node position on the distribution line. The positioning device includes a voltage component for obtaining three-phase voltage and zero-sequence voltage and a current component for obtaining three-phase current. The three-phase current obtained is synthesized into the zero-sequence current at the node position. By setting the above positioning device, the acquisition of zero-sequence voltage and zero-sequence current is realized. Among them, the above zero-sequence voltage signal and zero-sequence current signal are converted into digital signals through analog-to-digital conversion for use in system fault judgment.

[0093] Step S2, when the instantaneous value of the zero-sequence voltage reaches the set start value, this time node is defined as T1, and the recording starts, recording the 2 cycles before T1 and the 6 cycles after T1;

[0094] The above-mentioned "set start value" refers to a set value higher than the instantaneous value of the zero-sequence voltage. When a fault occurs, the normal zero-sequence voltage sine wave has a constant peak value. When a fault occurs, at the moment of occurrence, that is, at time T1, the system detects that the peak value has a step-like change. The moment T1 when the peak value produces a step is used as the time signal of the system response. The system automatically records the waveform to obtain the two cycles before time T1 and the two cycles after time T1.

[0095] In this embodiment, one point is recorded every millisecond, 120 points are recorded in each cycle, and a total of no less than 960 points are obtained.

[0096] Step S3, using an intelligent fusion algorithm to perform fault judgment based on the data obtained from the recorded waveform, the intelligent fusion algorithm includes a transient HHT algorithm, an EMD algorithm, a transient energy algorithm and a first half-wave algorithm, and using the formula Sn=μ1n|J1n|+μ2n|J2n|+μ3n|J3n|+μ4n|J4n| to calculate signal characteristics, wherein J1n, J2n, J3n, and J4n respectively represent the numerical values ​​processed by four different signal processing methods, and μ1n, μ2n, μ3n, and μ4n respectively represent the weights of the four different signal processing methods. If the Sn value is a negative value, it is judged that there is a ground fault at the node position, and if the Sn value is a positive value, it is judged that there is no ground fault at the node position.

[0097] In the above step S3, the weights μ1n, μ2n, μ3n, and μ4n are adaptively adjusted within the system. When the signal characteristics of a certain algorithm are obvious, the weight is increased, otherwise the weight is reduced. When the direction of the characteristic signal extracted by a certain node is opposite to the signal characteristics of other positions, the weight is increased.

[0098] Step S4, the final fault location is located on the transmission line between the node determined according to the above steps S2 and S3 and the node after it. At this time, the location of the unidirectional grounding fault point has been limited to between two specific nodes. All nodes have location signals. Therefore, the specific node section where the fault is located can be found on site through the node location signal inspection, and then further investigation can be carried out to locate the precise fault location.

[0099] In order to correct the fault determination process to further improve the accuracy of fault location and prevent false alarms, this embodiment also includes steps S5 to S7 of line selection correction.

[0100] Step S5, in which the zero-sequence voltage on each distribution bus in the substation and the three-phase current on each distribution branch line drawn from the substation are obtained, and the three-phase currents are synthesized to obtain the zero-sequence current.

[0101] A small current line selection device in a substation includes a voltage component arranged on the distribution bus of the substation for obtaining three-phase voltage and zero-sequence voltage, and a current component arranged on the distribution branch line for obtaining three-phase current and the zero-sequence current at that position. The zero-sequence voltage and three-phase current are obtained through the above-mentioned voltage component and current component, and the three-phase current is synthesized to obtain the zero-sequence current.

[0102] Step S6, performing analog-to-digital conversion on the zero-sequence voltage and current signals; when the instantaneous value of the zero-sequence voltage reaches the set start value, this time node is defined as T2, and recording begins, recording the 2 cycles before T2 and the 6 cycles after T2.

[0103] Step S7, using one or more of the HHT algorithm, EMD algorithm, transient energy algorithm and first half-wave algorithm to determine the distribution branch line where the fault is located, and comparing the number of the distribution branch line with the number of the distribution branch line where the fault point is located.

[0104] In the above correction process, when the small current line selection device installed in the substation determines that the distribution branch line number where the fault is located is consistent with the distribution branch line number corresponding to the distribution line where the fault point is located obtained by the positioning device, the final conclusion is drawn that the fault point is located on the distribution line; if the positioning devices on multiple distribution lines make fault judgments, the fault line selected by the small current line selection device in the substation is the line where the fault point is located, and the fault judgments on other lines are treated as misjudgments.

[0105] The key point of the embodiment of the present invention is to trigger the measurement of ground current disturbance caused by grounding, short circuit and lightning strike when an accident occurs, and use algorithm technology to calculate the accident point and accident type. The embodiment of the present invention utilizes the instantaneous change of the main line current transient caused by grounding, short circuit and lightning strike to the magnetic field around the accident, and this magnetic field change causes the current of the grounding circuit to change transiently.

[0106] Another key point of the present invention is distributed measurement and centralized calculation; and it includes two ways of obtaining values: active measurement and passive mutual inductance measurement. The induced current on the lightning protection line is related to the size of the surrounding electromagnetic field. When the line and the tower are in a steady state, the size of the induced current is related to the size of the line load current. The current of the transmission line is basically consistent when there is no line bifurcation. Therefore, the current on the grounding wire of each tower should also have a consistent change. The more towers connected to the system, the higher the accuracy reflected by the data.

[0107] It still needs to be explained that when a line or tower fails, it will definitely cause changes in the grounding current of the tower and the adjacent towers. The size and pattern of the change can reflect the failure of the tower. Since there are many types of line and tower failures, the data changes may be close or cannot be classified by a single data change. This is why the present application relies on an algorithm.

[0108] In addition, since there are many factors that cause partial discharge in insulators, including insulation failure of the insulator itself, partial discharge caused by climate or regional factors, partial discharge caused by contamination, etc., the characteristics of high-frequency pulse currents are very similar. The partial discharge signals caused by different insulators are all integrated into the grounding lead wire, which makes it extremely difficult to analyze and judge them. The insulator string that causes partial discharge cannot be located at present, but the system will be able to locate the corresponding pole tower, and process the corresponding insulation fault category through data and graph analysis, and effectively identify the insulating pole towers with real insulation faults based on the data of the entire line and the entire region through big data and deep learning. The more pole towers connected to the system, the higher the accuracy of the data reflected. This is the key point that the application plan relies on algorithms.

[0109] Through the embodiments of the present application, it is possible to greatly improve the accuracy of distributed measurement and the determination of line fault points and types; since the larger the implementation area and the more poles and towers with installed detection data, the higher and more accurate the ability to identify and diagnose the status of the poles and towers will be, it can greatly change the current status of line tower operation and inspection, reduce the labor intensity of employees, reduce the occurrence rate of line failures, and quickly respond to faulty poles and lines, reducing the power outage time caused by accidents.

[0110] Through the embodiments of the present application, it is also possible to greatly improve the convenience of project installation, implementation, and operation and maintenance, that is, installation, commissioning, and maintenance do not require power outages; there is no need to temporarily disconnect the tower ground wire; on-site installation does not require climbing poles; the existing Internet of Things communication platform is used, and there is no need to lay additional communication lines

[0111] Example 2

[0112] According to an embodiment of the present invention, a system embodiment for implementing the above-mentioned fault location method of the power transmission network is also provided. Figure 2 is a schematic diagram of the structure of a fault location system for a transmission network according to an embodiment of the present invention. Figure 2 As shown, the above-mentioned transmission network fault location system includes: a plurality of transmission lines 200, a collection device 202 ( Figure 2 Only one collection device 202 is schematically drawn in the figure, but since there are multiple detection points, multiple collection devices 202) and fault location devices 204 can be set on each transmission line 200, where:

[0113] A plurality of transmission lines 200 constituting the above-mentioned transmission network;

[0114] The collecting device 202 is installed at a detection point on each transmission line 200 and is used to collect power information of each detection point, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current;

[0115] The fault locating device 204 communicates with the collecting device 202 and is used to determine the fault location of the power fault based on the power information.

[0116] In an embodiment of the present invention, a plurality of transmission lines constituting the above-mentioned transmission network; a collection device installed at a detection point on each transmission line, for collecting power information of each detection point, wherein the above-mentioned power information includes at least one of the following: zero-sequence voltage and zero-sequence current; a fault locating device communicating with the above-mentioned collection device, for determining the fault position of the power fault based on the above-mentioned power information, thereby achieving the purpose of improving the detection efficiency of fault locating of the transmission lines in the transmission network, thereby achieving the technical effect of improving the fault locating efficiency of the transmission network, and further solving the technical problem in the prior art that the detection efficiency of the fault locating method for the transmission lines in the transmission network is low, resulting in low transmission network fault locating efficiency.

[0117] In order to solve the technical problems existing in the prior art, the embodiment of the present application provides a fault location system for a transmission network, which is essentially a single-phase grounding fault location system for a distribution overhead cable hybrid line, which can significantly improve the accuracy and speed of locating unidirectional grounding faults in distribution lines.

[0118] The fault location system for the transmission network provided in the embodiment of the present application can be, but is not limited to, applicable to the transmission operation scenario of laying grounding lines on transmission towers at voltage levels of 110kv and above. The grounding current is collected through the tower grounding lead, and the big data formed by the grounding current along the line is analyzed and classified using an intelligent fusion algorithm to effectively locate the fault line and tower, and classify various faults of the tower.

[0119] The intelligent fusion algorithm includes at least one of the following: transient HHT algorithm, EMD algorithm, transient energy algorithm and first half-wave algorithm.

[0120] In an embodiment of the present application, based on pre-configured segmented positioning information, detection points on multiple transmission lines on the transmission network are determined, and power information of each detection point, for example, zero-sequence voltage and zero-sequence current, is obtained respectively; then, based on the above power information, it can be determined whether the above detection point is a fault node; if the judgment result is yes, the fault location where the power fault occurs is determined based on the positioning of the above fault node on the above transmission line.

[0121] In the embodiment of the present application, the monitoring unit can be clamped on each tower grounding cable of one or more lines by using a communication link but is not limited to it; the background and the monitoring unit communicate and test and synchronize the time; the grounding current of each grounding line is actively measured multiple times in a time-sharing manner to form basic data of the line and the area; when lightning strikes, single-phase grounding or phase-to-phase short circuits occur, the electrical induction principle will cause instantaneous disturbances in the grounding current near the fault point, triggering the monitoring unit to measure, record and transmit this set of values; the background uses algorithms to calculate reference accident points and accident types.

[0122] It is still necessary to explain that the above-mentioned transmission network fault location method in the embodiment of the present application can be implemented in the transmission network fault location system provided in the embodiment of the present application. The present invention collects a numerical data set of relative changes in the grounding current of the transmission tower, continuously iterates and optimizes the basic data, and continuously optimizes the algorithm, and finally forms a transmission line fault location system that is easy to implement, low-cost, accurate in measurement, and has advance warning value.

[0123] In the embodiment of the present application, the above-mentioned fault location system is equipped with a composite sensor that can measure ground leakage current, high-frequency pulse current, and induced lightning current, and has a monitoring unit that combines electromagnetic induction measurement, long-range and short-range communication, and battery combined with solar power drive. The monitoring unit is distributed on each transmission tower in the monitoring area, and has a background database and application with storage, analysis and alarm functions.

[0124] In an optional embodiment, a collection device is installed on each detection point on multiple transmission lines on the above-mentioned transmission network, and the above-mentioned collection device includes: a voltage component for collecting three-phase voltage and zero-sequence voltage and a current component for collecting three-phase current.

[0125] In an optional embodiment, the above-mentioned acquisition device includes: a voltage detection device, used to obtain the above-mentioned zero-sequence voltage of each of the above-mentioned detection points on the above-mentioned transmission line; a current detection device, used to obtain the three-phase current of each of the above-mentioned detection points on the above-mentioned transmission line; a synthesis device, connected to the above-mentioned current detection device, used to synthesize the above-mentioned three-phase current to obtain the zero-sequence current; and a digital-to-analog conversion device, used to perform analog-to-digital conversion on the above-mentioned zero-sequence voltage and the above-mentioned zero-sequence current signals.

[0126] Optionally, the voltage detection device is a voltage detector for obtaining the zero-sequence voltage of each of the detection points on the transmission line; the current detection device is a current detector for obtaining the three-phase current of each of the detection points on the transmission line; the synthesis device is a current synthesizer for synthesizing the three-phase current to obtain the zero-sequence current; the digital-to-analog conversion device is a digital-to-analog converter for performing analog-to-digital conversion on the zero-sequence voltage and the zero-sequence current signals to generate digital signals.

[0127] In an optional embodiment, the above-mentioned fault location device includes: a recording device, used to obtain a first recording result within a predetermined period with a first moment as the starting time; an analysis device, connected to the above-mentioned recording device, for determining whether a fault occurs at the above-mentioned detection point based on the above-mentioned first recording result.

[0128] Optionally, the recording device is a recorder, and the analyzing device is a processor.

[0129] In an embodiment of the present application, it is determined whether the instantaneous value of the zero-sequence voltage collected at the above-mentioned detection point at the first moment T1 reaches the set starting value; when the instantaneous value of the zero-sequence voltage reaches the set starting value, recording is started, and the recording device obtains the 2 cycles before the first moment T1 and the 6 cycles generated after the first moment; the analysis device uses an intelligent fusion algorithm to perform fault judgment based on the first recording result obtained by recording, wherein the above-mentioned intelligent fusion algorithm includes a transient HHT algorithm, an EMD algorithm, a transient energy algorithm and a first half-wave algorithm.

[0130] For example, the signal characteristics can be calculated by using, but not limited to, the formula Sn=μ1n|J1n|+μ2n|J2n|+μ3n|J3n|+μ4n|J4n|, wherein J1n, J2n, J3n, and J4n respectively represent the numerical values ​​after processing by four different signal processing methods, and μ1n, μ2n, μ3n, and μ4n respectively represent the weights of the four different signal processing methods. If the Sn value is a negative value, it is judged that there is a ground fault at the node position; if the Sn value is a positive value, it is judged that there is no ground fault at the node position.

[0131] In an optional embodiment, the above-mentioned fault location system also includes: a first locator arranged on the fault node, for obtaining the first location information of the above-mentioned fault node; a second locator arranged at the next detection point after the above-mentioned fault node, for obtaining the second location information; wherein the above-mentioned fault location is on the line section between the above-mentioned first location information and the above-mentioned second location information.

[0132] In an embodiment of the present application, the first position information of the above-mentioned fault node and the second position information of the next detection point located after the above-mentioned fault node are obtained, and the final fault position is located on the line section between the first position information and the above-mentioned second position information.

[0133] In an optional embodiment, the fault location system further includes: a current line selection device, arranged in the substation, wherein the current line selection device includes: a voltage component arranged on the distribution bus of the substation for obtaining three-phase voltage and zero-sequence voltage, and a current component arranged on the distribution branch line of the substation for obtaining three-phase current and position zero-sequence current.

[0134] In an optional embodiment, the fault location system further includes: a second acquisition device, installed on each distribution branch line in the substation, for collecting power information of each distribution branch line in the substation, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; an analysis device, connected to the second acquisition device, for determining the distribution branch line where the power fault occurs and the location information of the distribution branch line based on the power information of each distribution branch line; a corrector, for completing the correction of the fault location by comparing the location information of the distribution branch line where the power fault occurs with the fault location of the power fault determined by positioning.

[0135] In an optional embodiment, if the detection results of multiple detection points on multiple distribution lines all indicate that there is a power fault, the distribution branch line in the substation where the power fault is detected is treated as the faulty line, and the fault results on other lines are treated as misjudgments.

[0136] As an optional embodiment, the embodiment of the present application also includes a solution for line selection correction, which replaces the acquisition of the zero-sequence voltage on each distribution bus in the substation and the three-phase current on each distribution branch line drawn from the substation, synthesizes the three-phase current to obtain the zero-sequence current; and performs analog-to-digital conversion on the above-mentioned zero-sequence voltage and zero-sequence current signals.

[0137] In the above embodiment, by judging whether the instantaneous value of the zero-sequence voltage on each distribution bus collected at the second moment reaches the set starting value, when the instantaneous value of the zero-sequence voltage reaches the set starting value, the recording starts, and the 2 cycles before the moment T2 and the 6 cycles after T2 are recorded; and the embodiment of the present application can, but is not limited to, use one or more of the HHT algorithm, EMD algorithm, transient energy algorithm and first half-wave algorithm to judge the distribution branch line where the fault is located, and the number of the distribution branch line is compared with the number of the distribution branch line where the fault point is located.

[0138] As an optional embodiment, it is possible but not limited to recording one point per millisecond, recording 120 points in each cycle, and obtaining no less than 960 points in total.

[0139] As another optional embodiment, the weights μ1n, μ2n, μ3n, and μ4n are adaptively adjusted within the system. When the signal characteristics of a certain algorithm are obvious, the weight is increased, otherwise the weight is reduced. When the direction of the characteristic signal extracted by a certain node is opposite to the signal characteristics of other positions, the weight is increased.

[0140] The advantages and positive effects brought by the embodiments of the present application may include but are not limited to the following:

[0141] 1. By obtaining the three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current at multiple points of each pole on the distribution branch line, and through comprehensive calculation with the above three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current as parameters, the position of the unidirectional grounding fault is judged. The unidirectional grounding fault point is judged to be located between two adjacent poles on the distribution branch line. Therefore, the relatively accurate positioning of the fault position is achieved, making it easier to handle the fault in a timely manner.

[0142] 2. By introducing a fusion algorithm composed of multiple current mainstream algorithms and assigning weights to each algorithm, the effective extraction of fault characteristic signals is achieved, and the speed and accuracy of unidirectional grounding fault judgment are improved.

[0143] It should be noted that any optional embodiment or preferred method for locating a fault in a power transmission network in the above-mentioned embodiment 1 can be executed or implemented in the fault locating system for a power transmission network provided in this embodiment.

[0144] In addition, it is still necessary to explain that the optional or preferred implementation of this embodiment can refer to the relevant description in Example 1, which will not be repeated here.

[0145] Example 3

[0146] According to an embodiment of the present invention, there is also provided an embodiment of a device for implementing the above-mentioned method for locating a fault in a power transmission network. Figure 3 is a schematic diagram of the structure of a fault location device for a transmission network according to an embodiment of the present invention. Figure 3 As shown, the above-mentioned fault location device of the power transmission network includes: a first acquisition module 300, a second acquisition module 302, a judgment module 304 and a location module 306, wherein:

[0147] The first acquisition module 300 is used to acquire detection points on multiple transmission lines on the transmission network, wherein the detection points are determined based on pre-configured segmented positioning information; the second acquisition module 302 is used to acquire power information of each detection point, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; the judgment module 304 is used to judge whether the detection point is a fault node based on the power information; the positioning module 306 is used to determine the fault location of the power fault based on the positioning of the fault node on the transmission line if the detection point is the fault node.

[0148] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0149] It should be noted that the first acquisition module 300, the second acquisition module 302, the judgment module 304 and the positioning module 304 correspond to steps S102 to S108 in Example 1, and the examples and application scenarios implemented by the above modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above Example 1. It should be noted that the above modules can be run in a computer terminal as part of the device.

[0150] It should be noted that the optional or preferred implementation of this embodiment can refer to the relevant description in Example 1, which will not be repeated here.

[0151] The above-mentioned fault location device for the power transmission network may also include a processor and a memory. The above-mentioned first acquisition module 300, second acquisition module 302, judgment module 304 and positioning module 304 are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions.

[0152] The processor includes a kernel, which retrieves the corresponding program unit from the memory. The kernel may be one or more. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. The memory includes at least one memory chip.

[0153] According to an embodiment of the present application, an embodiment of a non-volatile storage medium is also provided. Optionally, in this embodiment, the non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute any of the above-mentioned transmission network fault location methods.

[0154] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group, and the non-volatile storage medium includes a stored program.

[0155] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: obtaining detection points on multiple transmission lines on the transmission network, wherein the above detection points are determined based on pre-configured segmented positioning information; obtaining power information of each detection point, wherein the above power information includes at least one of the following: zero-sequence voltage and zero-sequence current; based on the above power information, determining whether the above detection point is a fault node; if the above detection point is the above fault node, determining the fault location of the power fault based on the positioning of the above fault node on the above transmission line.

[0156] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: a voltage component for collecting three-phase voltage and zero-sequence voltage and a current component for collecting three-phase current.

[0157] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: obtain the above-mentioned zero-sequence voltage and three-phase current of each of the above-mentioned detection points on the above-mentioned transmission line; synthesize the above-mentioned three-phase currents to obtain the zero-sequence current; perform analog-to-digital conversion on the above-mentioned zero-sequence voltage and the above-mentioned zero-sequence current signals to generate digital signals.

[0158] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: determine whether the instantaneous value of the zero-sequence voltage collected at the above-mentioned detection point at the first moment reaches the set start value; if reached, start recording with the above-mentioned first moment as the starting time, and obtain the first recording result within a predetermined period, wherein the above-mentioned first recording result includes: a first number of cycles generated before the above-mentioned first moment and a second number of cycles generated after the above-mentioned first moment; use an intelligent fusion algorithm to analyze the above-mentioned first recording result to determine whether the above-mentioned detection point has a fault, wherein the above-mentioned intelligent fusion algorithm includes at least one of the following: transient HHT algorithm, EMD algorithm, transient energy algorithm and first half-wave algorithm.

[0159] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: obtain the first position information of the above-mentioned fault node, and the second position information of the next detection point located after the above-mentioned fault node; obtain the fault location on the above-mentioned transmission line, wherein the above-mentioned fault location is on the line section between the above-mentioned first position information and the above-mentioned second position information.

[0160] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: obtaining power information of each distribution branch line in the substation, wherein the above power information includes at least one of the following: zero-sequence voltage and zero-sequence current; based on the power information of each distribution branch line, determining the distribution branch line where the power fault occurs and the location information of the distribution branch line; by comparing the location information of the distribution branch line where the above power fault occurs with the fault location of the power fault determined by positioning, the correction of the fault location is completed.

[0161] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: a voltage component for obtaining three-phase voltage and zero-sequence voltage is set on the distribution bus of the above-mentioned substation, and a current component for obtaining three-phase current and position zero-sequence current is set on the distribution branch line of the above-mentioned substation.

[0162] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: obtain the zero-sequence voltage on each distribution bus in the substation, and the zero-sequence current on each distribution branch line drawn from the above-mentioned substation; perform analog-to-digital conversion on the zero-sequence voltage on the above-mentioned distribution bus and the zero-sequence current on the above-mentioned distribution branch line.

[0163] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: determine whether the instantaneous value of the zero-sequence voltage on each distribution bus collected at the second moment reaches the set start value; if reached, start recording with the above-mentioned second moment as the starting time, and obtain the second recording result within a predetermined period, wherein the above-mentioned second recording result includes: a third number of cycles generated before the above-mentioned second moment and a fourth number of cycles generated after the above-mentioned second moment; use an intelligent fusion algorithm to analyze the above-mentioned second recording result to determine the distribution branch line where the above-mentioned power fault occurs, wherein the above-mentioned intelligent fusion algorithm includes at least one of the following: transient HHT algorithm, EMD algorithm, transient energy algorithm and first half-wave algorithm.

[0164] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: if the detection results of multiple detection points on multiple distribution lines all indicate that there is a power fault, the distribution branch line in the substation that detects the above power fault is treated as the fault line, and the fault results on other lines are treated as misjudgments.

[0165] According to an embodiment of the present application, an embodiment of a processor is also provided. Optionally, in this embodiment, the processor is used to run a program, wherein when the program is run, any one of the above-mentioned methods for locating a fault in a power transmission network is executed.

[0166] According to an embodiment of the present application, an embodiment of an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute any one of the above-mentioned power transmission network fault location methods.

[0167] According to an embodiment of the present application, an embodiment of a computer program product is also provided. When executed on a data processing device, the program is suitable for executing the steps of initializing any one of the above-mentioned fault location method steps for the power transmission network.

[0168] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0169] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0170] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the above-mentioned units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0171] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0172] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0173] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable non-volatile storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a non-volatile storage medium, including a number of instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the above-mentioned methods of each embodiment of the present invention. The aforementioned non-volatile storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0174] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for locating a fault in a transmission network, characterized in that: Applicable to power transmission operation scenarios of laying grounding lines on transmission towers, including: Acquire detection points on a plurality of transmission lines on the transmission network, wherein the detection points are determined based on pre-configured segment positioning information; Acquire power information of each detection point, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; Based on the power information, determining whether the detection point is a faulty node; If the detection point is the fault node, determining a fault location where the power fault occurs based on the location of the fault node on the transmission line; The method further includes: using a communication link to clamp the monitoring unit on each tower grounding cable of one or more lines among multiple transmission lines; the background communicates with the monitoring unit for testing and synchronizing the time; measuring the grounding current of each grounding line multiple times in time division to form basic data of the monitoring area where the one or more lines and the monitoring unit are distributed; when lightning strikes, single-phase grounding or phase-to-phase short circuits occur, the monitoring unit is triggered to measure, record and transmit ground leakage current, high-frequency pulse current, and induced lightning current; the background uses an algorithm to calculate the accident point and accident type, and the algorithm is obtained by optimizing and iterating by collecting a numerical data set of relative changes in the grounding current of the transmission tower.

2. The method according to claim 1, characterized in that: A collection device is installed on each detection point on multiple transmission lines on the transmission network, and the collection device includes: a voltage component for collecting three-phase voltage and zero-sequence voltage and a current component for collecting three-phase current.

3. The method according to claim 2, characterized in that Obtain power information for each detection point, including: Obtaining the zero-sequence voltage and three-phase current of each detection point on the transmission line; Synthesizing the three-phase currents to obtain the zero-sequence current; The zero-sequence voltage and the zero-sequence current are subjected to analog-to-digital conversion to generate digital signals.

4. The method according to claim 1, characterized in that: Based on the power information, determining whether the detection point is a faulty node includes: Determine whether the instantaneous value of the zero-sequence voltage collected at the detection point at the first moment reaches a set starting value; If it is reached, start recording with the first moment as the starting time, and obtain a first recording result within a predetermined period, wherein the first recording result includes: a first number of cycles generated before the first moment and a second number of cycles generated after the first moment; An intelligent fusion algorithm is used to analyze the first recording result to determine whether a fault occurs at the detection point, wherein the intelligent fusion algorithm includes at least one of the following: a transient HHT algorithm, an EMD algorithm, a transient energy algorithm, and a first half-wave algorithm.

5. The method according to claim 4, characterized in that Determining a fault location where a power fault occurs based on the location of the fault node on the transmission line includes: Acquire first position information of the faulty node and second position information of a next detection point after the faulty node; Acquire a fault location on the transmission line, wherein the fault location is on a line section between the first location information and the second location information.

6. The method according to any one of claims 1 to 5, characterized in that After determining a fault location where the power fault occurs based on the location of the fault node on the transmission line, the method further includes: Acquire power information of each distribution branch line in the substation, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; Based on the power information of each distribution branch line, determining a distribution branch line having a power failure and location information of the distribution branch line; The fault location is corrected by comparing the location information of the power distribution branch line where the power fault occurs with the fault location of the power fault determined by positioning.

7. The method according to claim 6, characterized in that A current line selection device is arranged in the substation, and the current line selection device comprises: a voltage component arranged on the distribution bus of the substation for obtaining three-phase voltage and zero-sequence voltage, and a current component arranged on the distribution branch line of the substation for obtaining three-phase current and position zero-sequence current.

8. The method according to claim 7, characterized in that Obtain power information of each distribution branch line in the substation, including: Obtaining the zero-sequence voltage on each distribution bus in the substation and the zero-sequence current on each distribution branch line drawn from the substation; Analog-to-digital conversion is performed on the zero-sequence voltage on each distribution bus and the zero-sequence current on each distribution branch line.

9. The method according to claim 6, characterized in that Based on the power information of each distribution branch line, determining a distribution branch line having a power failure and location information of the distribution branch line includes: Determine whether the instantaneous value of the zero-sequence voltage on each distribution bus collected at the second moment reaches the set starting value; If it is reached, start recording with the second moment as the starting time, and obtain a second recording result within a predetermined period, wherein the second recording result includes: a third number of cycles generated before the second moment and a fourth number of cycles generated after the second moment; An intelligent fusion algorithm is used to analyze the second recording result to determine the distribution branch line where the power fault occurs, wherein the intelligent fusion algorithm includes at least one of the following: a transient HHT algorithm, an EMD algorithm, a transient energy algorithm, and a first half-wave algorithm.

10. The method according to claim 6, characterized in that If the detection results of multiple detection points on multiple distribution lines all indicate that there is a power fault, the distribution branch line in the substation where the power fault is detected is regarded as a faulty line, and the fault results on other lines are treated as misjudgments.

11. A fault location system for a power transmission network, characterized in that: Applied to the transmission operation scenario of laying grounding lines on transmission towers, the positioning system includes: the multiple transmission lines that make up the transmission grid; A collection device is installed at a detection point on each transmission line, and is used to collect power information of each detection point, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current, and the detection point is determined based on pre-configured segmented positioning information; a fault locating device, communicating with the collecting device, and configured to determine a fault location where a power fault occurs based on the power information; Among them, the system is also used to clamp the monitoring unit on each tower grounding cable of one or more lines among multiple transmission lines using a communication link; the background and the monitoring unit communicate and test and synchronize; the grounding current of each grounding line is measured multiple times in a time-sharing manner to form basic data of the monitoring area where the one or more lines and the monitoring unit are distributed; when lightning strikes, single-phase grounding or phase-to-phase short circuits occur, the monitoring unit is triggered to measure, record and transmit ground leakage current, high-frequency pulse current, and induced lightning current; the background uses an algorithm to calculate the accident point and accident type, and the algorithm is obtained by optimizing and iterating by collecting the relative change numerical data set of the grounding current of the transmission tower.

12. The fault location system according to claim 11, characterized in that: A collection device is installed on each detection point on multiple transmission lines on the transmission network, and the collection device includes: a voltage component for collecting three-phase voltage and zero-sequence voltage and a current component for collecting three-phase current.

13. The fault location system according to claim 12, characterized in that: The collection device comprises: A voltage detection device, used for obtaining the zero-sequence voltage of each detection point on the transmission line; A current detection device, used for obtaining the three-phase current of each detection point on the transmission line; A synthesis device, connected to the current detection device, for synthesizing the three-phase current to obtain a zero-sequence current; A digital-to-analog conversion device is used to perform analog-to-digital conversion on the zero-sequence voltage and the zero-sequence current.

14. The fault location system according to claim 11, characterized in that: The fault locating device comprises: A wave recording device, used for obtaining a first wave recording result within a predetermined period with a first moment as a starting time; An analysis device is connected to the recording device and is used to determine whether a fault occurs at the detection point based on the first recording result.

15. The fault location system according to claim 14, characterized in that: The fault location system also includes: A first locator provided on the faulty node, used to obtain first location information of the faulty node; A second locator provided at a next detection point after the faulty node, for acquiring second location information; The fault location is on the line section between the first location information and the second location information.

16. The fault location system according to any one of claims 11 to 15, characterized in that: The fault location system also includes: A second collection device is installed on each distribution branch line in the substation, and is used to collect power information of each distribution branch line in the substation, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; An analysis device, connected to the second collection device, for determining a distribution branch line having a power failure and location information of the distribution branch line based on the power information of each distribution branch line; The corrector is used to correct the fault location by comparing the location information of the distribution branch line where the power fault occurs with the fault location of the power fault determined by positioning.

17. The fault location system according to claim 16, characterized in that: The fault location system also includes: A current line selection device is arranged in the substation, wherein the current line selection device includes: a voltage component arranged on the distribution bus of the substation for obtaining three-phase voltage and zero-sequence voltage, and a current component arranged on the distribution branch line of the substation for obtaining three-phase current and position zero-sequence current.

18. A fault location device for a power transmission network, characterized in that: Applicable to power transmission operation scenarios of laying grounding lines on transmission towers, including: A first acquisition module is used to acquire detection points on a plurality of transmission lines on the transmission network, wherein the detection points are determined based on pre-configured segmented positioning information; A second acquisition module is used to acquire power information of each detection point, wherein the power information includes at least one of the following: zero-sequence voltage and zero-sequence current; A judgment module, used for judging whether the detection point is a fault node based on the power information; a positioning module, configured to determine a fault location where the power fault occurs based on the positioning of the fault node on the transmission line if the detection point is the fault node; The device is also used to clamp the monitoring unit on each tower grounding cable of one or more lines among multiple transmission lines using a communication link; the background communicates with the monitoring unit for testing and timing; the grounding current of each grounding line is measured multiple times in a time-sharing manner to form basic data of the monitoring area where the one or more lines and the monitoring unit are distributed; when lightning strikes, single-phase grounding or phase-to-phase short circuits occur, the monitoring unit is triggered to measure, record and transmit ground leakage current, high-frequency pulse current, and induced lightning current; the background uses an algorithm to calculate the accident point and accident type, and the algorithm is obtained by optimizing and iterating by collecting a numerical data set of relative changes in the grounding current of the transmission tower.

19. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the fault location method described in any one of claims 1 to 10.

20. A processor, characterized in that: The processor is used to run a program, wherein the program is configured to execute the fault location method according to any one of claims 1 to 10 when running.

21. An electronic device comprising a memory and a processor, characterized in that: The memory stores a computer program, and the processor is configured to run the computer program to execute the fault location method according to any one of claims 1 to 10.

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