CN119087292B - Power transmission line fault monitoring method and system - Google Patents
Power transmission line fault monitoring method and system Download PDFInfo
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- CN119087292B CN119087292B CN202411578387.9A CN202411578387A CN119087292B CN 119087292 B CN119087292 B CN 119087292B CN 202411578387 A CN202411578387 A CN 202411578387A CN 119087292 B CN119087292 B CN 119087292B
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/24—Classification techniques
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
本发明公开了一种输电线路故障监测方法及系统，获取输电线路的监测数据；对所述故障代码进行分析，获得初始故障种类；基于所述故障代码对应的目标输电线路，根据目标输电线路的数据采集位置确定目标负载，对目标负载以及目标输电线路的电气数据进行电压电流分析，确定中间故障种类；判断所述中间故障种类与所述初始故障种类是否相同；若是，则基于所述初始故障种类和电压电流分析结果，确定最终故障种类；若否，则记录所述目标输电线路的数据采集位置，并将数据采集位置发送给维修人员，以使所述维修人员前往所述数据采集位置进行故障排查。本发明提高了输电线路故障监测的准确性。
The present invention discloses a method and system for monitoring a power transmission line fault, which obtains monitoring data of a power transmission line; analyzes the fault code to obtain an initial fault type; determines a target load based on a target power transmission line corresponding to the fault code and a data acquisition position of the target power transmission line, performs voltage and current analysis on the target load and the electrical data of the target power transmission line to determine an intermediate fault type; determines whether the intermediate fault type is the same as the initial fault type; if so, determines the final fault type based on the initial fault type and the voltage and current analysis results; if not, records the data acquisition position of the target power transmission line, and sends the data acquisition position to a maintenance personnel, so that the maintenance personnel go to the data acquisition position to troubleshoot the fault. The present invention improves the accuracy of power transmission line fault monitoring.
Description
Technical Field
The invention relates to the technical field of power grid line fault monitoring, in particular to a power transmission line fault monitoring method and system.
Background
In the prior art, fault investigation is generally performed by identifying fault codes transmitted by a power transmission line, but because the condition of the power transmission line in a power grid is complex, the fault is confirmed by the fault codes only, so that the fault judgment accuracy of the power transmission line in the prior art is lower.
Therefore, a power transmission line fault monitoring strategy is needed, so that the problem that the accuracy of power transmission line fault judgment in the prior art is low is solved.
Disclosure of Invention
The embodiment of the invention provides a power transmission line fault monitoring method and a power transmission line fault monitoring system, which are used for solving the problem that the accuracy of power transmission line fault judgment in the prior art is low.
In order to solve the above problems, an embodiment of the present invention provides a method for monitoring a fault of a power transmission line, including:
Acquiring monitoring data of a power transmission line, wherein the monitoring data comprises fault codes and electric data corresponding to a line carrying load, and the load is arranged on the power transmission line;
Analyzing the fault code to obtain an initial fault type, wherein the initial fault type comprises an insulation fault, a grounding fault, a jumper fault, a short circuit fault, a circuit break fault and a flashover fault;
Determining a target load according to a data acquisition position of the target power transmission line based on the target power transmission line corresponding to the fault code, performing voltage and current analysis on the target load and electric data of the target power transmission line, and determining an intermediate fault type;
Judging whether the intermediate fault type is the same as the initial fault type, if so, determining a final fault type based on the initial fault type and a voltage and current analysis result, and if not, recording a data acquisition position of the target power transmission line and sending the data acquisition position to a maintenance person so that the maintenance person can go to the data acquisition position for fault investigation.
As an improvement of the above solution, the voltage and current analysis is performed on the electrical data of the target load and the target transmission line, and the determining the type of the intermediate fault includes:
Judging the current of the target transmission line;
If the current increases a first preset current threshold value within a first preset time, the current fault type of the target power transmission line is a current increase fault type, and voltage analysis is carried out on the target power transmission line corresponding to the current increase fault type, so that the type of the intermediate fault is determined;
if the current is reduced by a second preset current threshold value within the first preset time, the current fault type of the target power transmission line is a current reduction fault type, and voltage analysis is carried out on the target power transmission line corresponding to the current reduction fault type, so that the type of the intermediate fault is determined.
The method for determining the type of the intermediate fault comprises the following steps of performing voltage analysis on a target power transmission line corresponding to the type of the current increasing fault, and further determining the type of the intermediate fault, wherein the type of the intermediate fault comprises an insulation fault, a ground fault, a short circuit fault and a flashover fault, and the method comprises the following steps:
Collecting line voltage and zero sequence voltage of a target power transmission line corresponding to the current increasing fault type and load voltage of a target load corresponding to the target power transmission line;
If the zero sequence voltage is greater than a first voltage threshold value, determining that the current target power transmission line has a grounding fault based on phase monitoring operation, wherein the phase monitoring operation is used for acquiring fault phases, and the grounding faults comprise single-phase grounding faults, double-phase grounding faults and three-phase grounding faults;
If the line voltage is smaller than a second voltage threshold value within a second preset time and rises to the initial line voltage after the second preset time, determining that a flashover fault occurs on the current target power transmission line based on phase monitoring operation, wherein the flashover fault comprises a single-phase flashover fault, a double-phase flashover fault and a three-phase flashover fault;
And when the voltage of each target load corresponding to the target power transmission line is reduced, carrying out reduction analysis on the voltage of the target load, and determining that the current target power transmission line has short circuit fault or insulation fault.
As an improvement to the above, the descent analysis includes:
Determining a load distribution diagram by taking a target line as a central point based on the connection relation between the target load and the target line, wherein the color types of each target load are the same and the color depths are different;
The voltage value of each target load is taken as the color depth of each target load in the load distribution diagram, and the load distribution diagram with color is identified, wherein the color depth is increased along with the increase of the voltage value;
when the color of a target load connected with the target line only appears, determining that the current target power transmission line has a short-circuit fault based on phase monitoring operation, wherein the insulation fault comprises a single-phase short-circuit fault, a double-phase short-circuit fault and a three-phase short-circuit fault;
When a plurality of target loads are colored and the color depth of the target loads which are not connected with the target line is increased along with the decrease of the starting point distance, determining that the current target power transmission line is in an insulation fault based on the phase monitoring operation, wherein the insulation fault comprises a single-phase insulation fault, a double-phase insulation fault and a three-phase insulation fault.
The method for determining the type of the intermediate fault comprises the following steps of determining the type of the intermediate fault by judging the voltage of the target power transmission line corresponding to the type of the current reduction fault, wherein the type of the intermediate fault comprises jumper faults and circuit breaking faults, and further comprises the following steps:
Collecting current to reduce the line voltage of a target power transmission line corresponding to the fault type;
If the line voltage is smaller than a third voltage threshold value within a third preset time and rises to the initial line voltage after the third preset time, determining that a jumper fault occurs in the current target power transmission line based on phase monitoring operation, wherein the jumper fault comprises a single-phase jumper fault, a double-phase jumper fault and a three-phase jumper fault;
If the line voltage is 0, determining that the current target power transmission line has a circuit breaking fault based on phase monitoring operation, wherein the circuit breaking fault comprises a single-phase circuit breaking fault, a double-phase circuit breaking fault and a three-phase circuit breaking fault.
As an improvement of the above, the phase monitoring operation includes:
acquiring a three-phase power data waveform and a preset normal waveform profile corresponding to a target power transmission line;
extracting the outline of each phase of electric data waveform to obtain a corresponding waveform outline;
Respectively carrying out shape similarity calculation on the normal waveform profile and each waveform profile to obtain a similarity calculation value between each waveform profile and the normal waveform profile;
If the number of waveform profiles with the similarity calculated value being larger than the similarity threshold value is 0, three-phase faults occur;
if the number of waveform profiles with the similarity calculated value being larger than the similarity threshold value is 1, a biphase fault occurs;
if the number of waveform profiles with the similarity calculated value being greater than the similarity threshold value is 2, single-phase faults occur.
As an improvement of the above solution, the analyzing the fault code to obtain an initial fault type includes:
And taking the fault type which is the same as the corresponding letter of the fault code in a preset fault code library as an initial fault type, wherein the fault code library comprises a plurality of fault code letters, and each fault code letter corresponds to one fault type.
Correspondingly, the embodiment of the invention also provides a power transmission line fault monitoring system, which comprises a data acquisition module, an initial fault determination module, an intermediate fault determination module and a data judgment module;
The data acquisition module is used for acquiring monitoring data of the power transmission line, wherein the monitoring data comprises fault codes and electric data corresponding to a line carrying load;
The initial fault determination module is used for analyzing the fault code to obtain an initial fault type, wherein the type of the initial fault type comprises an insulation fault, a grounding fault, a jumper fault, a short circuit fault, an open circuit fault and a flashover fault;
The intermediate fault determining module is used for determining a target load according to the data acquisition position of the target power transmission line based on the target power transmission line corresponding to the fault code, performing voltage and current analysis on the target load and the electric data of the target power transmission line, and determining the type of the intermediate fault;
the data judging module is used for judging whether the intermediate fault type is the same as the initial fault type, if so, determining a final fault type based on the initial fault type and a voltage and current analysis result, and if not, recording a data acquisition position of the target power transmission line and sending the data acquisition position to a maintenance person so that the maintenance person can go to the data acquisition position for fault investigation.
Correspondingly, an embodiment of the invention also provides a computer terminal device, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor realizes the power transmission line fault monitoring method according to the invention when executing the computer program.
Correspondingly, an embodiment of the invention also provides a computer readable storage medium, which comprises a stored computer program, wherein the computer program controls equipment where the computer readable storage medium is located to execute the power transmission line fault monitoring method according to the invention when running.
From the above, the invention has the following beneficial effects:
the invention provides a power transmission line fault monitoring method, which comprises the steps of obtaining monitoring data of a power transmission line, analyzing fault codes to obtain initial fault types, determining target loads based on target power transmission lines corresponding to the fault codes according to data acquisition positions of the target power transmission lines, performing voltage and current analysis on the target loads and electric data of the target power transmission lines to determine intermediate fault types, judging whether the intermediate fault types are identical to the initial fault types, determining final fault types based on the initial fault types and voltage and current analysis results if the intermediate fault types are identical to the initial fault types, and recording the data acquisition positions of the target power transmission lines and sending the data acquisition positions to maintenance personnel if the intermediate fault types are not identical to the initial fault types, so that the maintenance personnel can go to the data acquisition positions to conduct fault investigation. According to the fault type identification method, the fault type identified by the fault code is primarily judged, the load and the line involved in the power transmission line generating the fault code are called to carry out electric data calling, secondary judgment of the fault type is carried out through the electric data, and whether the results of the primary judgment and the secondary judgment are the same or not is compared, so that the type of the fault type is rapidly determined, and the accuracy of monitoring the power transmission line fault is improved.
Drawings
Fig. 1 is a schematic flow chart of a method for monitoring faults of a power transmission line according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a power transmission line fault monitoring system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, fig. 1 is a flow chart of a power transmission line fault monitoring method according to an embodiment of the present invention, as shown in fig. 1, the embodiment includes steps 101 to 104, where each step is specifically as follows:
And 101, acquiring monitoring data of the power transmission line, wherein the monitoring data comprises fault codes and electric data corresponding to a line carrying load.
In this embodiment, by receiving data collected by the sensor, data extraction is performed on the collected data based on the big data model, and a fault code and an electrical number corresponding to a circuit carrying load are obtained.
And 102, analyzing the fault code to obtain an initial fault type, wherein the type of the initial fault type comprises an insulation fault, a grounding fault, a jumper fault, a short circuit fault, an open circuit fault and a flashover fault.
In this embodiment, the analyzing the fault code to obtain an initial fault type includes:
And taking the fault type which is the same as the corresponding letter of the fault code in a preset fault code library as an initial fault type, wherein the fault code library comprises a plurality of fault code letters, and each fault code letter corresponds to one fault type.
In a specific embodiment, the fault code library is obtained by inputting fault codes into the database in advance and associating corresponding fault types together.
To better illustrate the fault code, examples are provided where the ground fault is "G1", the two-phase ground fault is "G2", the three-phase ground fault is "G3", and so on.
And 103, determining a target load according to the data acquisition position of the target power transmission line based on the target power transmission line corresponding to the fault code, performing voltage and current analysis on the target load and the electric data of the target power transmission line, and determining the type of the intermediate fault.
In this embodiment, the voltage and current analysis is performed on the electrical data of the target load and the target power transmission line, and determining the type of the intermediate fault includes:
Judging the current of the target transmission line;
If the current increases a first preset current threshold value within a first preset time, the current fault type of the target power transmission line is a current increase fault type, and voltage analysis is carried out on the target power transmission line corresponding to the current increase fault type, so that the type of the intermediate fault is determined;
if the current is reduced by a second preset current threshold value within the first preset time, the current fault type of the target power transmission line is a current reduction fault type, and voltage analysis is carried out on the target power transmission line corresponding to the current reduction fault type, so that the type of the intermediate fault is determined.
It should be noted that the first preset time, the first preset current threshold, and the second preset current threshold may be adaptively modified based on the user requirement.
The method for determining the type of the intermediate fault comprises the following steps of performing voltage analysis on a target power transmission line corresponding to the type of the current increasing fault, and further determining the type of the intermediate fault, wherein the type of the intermediate fault comprises an insulation fault, a ground fault, a short circuit fault and a flashover fault, and the method comprises the following steps:
Collecting line voltage and zero sequence voltage of a target power transmission line corresponding to the current increasing fault type and load voltage of a target load corresponding to the target power transmission line;
If the zero sequence voltage is greater than a first voltage threshold value, determining that the current target power transmission line has a grounding fault based on phase monitoring operation, wherein the phase monitoring operation is used for acquiring fault phases, and the grounding faults comprise single-phase grounding faults, double-phase grounding faults and three-phase grounding faults;
If the line voltage is smaller than a second voltage threshold value within a second preset time and rises to the initial line voltage after the second preset time, determining that a flashover fault occurs on the current target power transmission line based on phase monitoring operation, wherein the flashover fault comprises a single-phase flashover fault, a double-phase flashover fault and a three-phase flashover fault;
And when the voltage of each target load corresponding to the target power transmission line is reduced, carrying out reduction analysis on the voltage of the target load, and determining that the current target power transmission line has short circuit fault or insulation fault.
It should be noted that the second preset time, the first voltage threshold, and the second voltage threshold may be adaptively modified based on the user requirement.
In a specific embodiment, for a line where a ground fault occurs, the current of the faulty phase will rise sharply, forming a larger ground current to ground, while the current of the non-faulty phase will fluctuate slightly, depending mainly on the load situation. Ground faults can lead to a reduced or even zero phase voltage, a non-faulty phase voltage can rise, and interphase short circuit can be caused when the phase voltage is severe, so that a larger fault range is caused.
When the earth fault occurs, due to the asymmetry of the power system, zero-sequence current and zero-sequence voltage are generated, the zero-sequence voltage rule depends on the zero-sequence voltage change caused by the fault, and the fault is determined by detecting the amplitude and the phase of the zero-sequence voltage. When a single-phase earth fault occurs, the zero sequence voltage of the fault point is highest, and the zero sequence voltage at the position far from the fault point in the system is lower, which depends on the magnitude of impedance between the measuring point and the earth. Thus, by measuring the zero sequence voltages at different points, the location of the fault can be aided. When a ground short occurs in a neutral point direct ground system (also known as a large ground current system), significant zero sequence voltages and currents will occur. In systems where the neutral point is not directly grounded, zero sequence voltages are also generated when single phase grounding occurs.
In a particular embodiment, for lines where flashover faults occur, transient currents may be generated at the fault point, which currents may be due to arcing or localized breakdown of the insulating material. At the moment of the flashover, a transient drop in the voltage on the line may occur due to a sudden increase in the current. If the flashover duration is long, it may result in the voltage being maintained at a lower level for a longer period of time.
In a specific embodiment, for a line where a short circuit fault occurs, the current may increase rapidly, possibly several times or even tens of times the normal operating current, due to a sharp decrease in the impedance of the circuit. Short circuit faults can lead to voltage drops in the grid, especially near the short circuit point, which are most pronounced.
In a specific embodiment, for a line where an insulation fault occurs, the current in the electrical device connecting the fault point with the power supply increases, the voltage across the electrical device around the fault point decreases, and the closer the electrical distance from the fault point is, the more severe the voltage drop is, even to zero.
As an improvement to the above, the descent analysis includes:
Determining a load distribution diagram by taking a target line as a central point based on the connection relation between the target load and the target line, wherein the color types of each target load are the same and the color depths are different;
The voltage value of each target load is taken as the color depth of each target load in the load distribution diagram, and the load distribution diagram with color is identified, wherein the color depth is increased along with the increase of the voltage value;
when the color of a target load connected with the target line only appears, determining that the current target power transmission line has a short-circuit fault based on phase monitoring operation, wherein the insulation fault comprises a single-phase short-circuit fault, a double-phase short-circuit fault and a three-phase short-circuit fault;
When a plurality of target loads are colored and the color depth of the target loads which are not connected with the target line is increased along with the decrease of the starting point distance, determining that the current target power transmission line is in an insulation fault based on the phase monitoring operation, wherein the insulation fault comprises a single-phase insulation fault, a double-phase insulation fault and a three-phase insulation fault.
In a specific embodiment, the condition that the load voltage drops is represented by colors, so that the recognition degree of the load voltage drop can be improved, and the type of the circuit fault can be rapidly recognized from the angle of an image by comparing the color depths of the colors, so that the recognition efficiency of the circuit fault is improved when the current of the target power transmission line is increased and the voltage of each target load corresponding to the target power transmission line is reduced.
The method for determining the type of the intermediate fault comprises the following steps of determining the type of the intermediate fault by judging the voltage of the target power transmission line corresponding to the type of the current reduction fault, wherein the type of the intermediate fault comprises jumper faults and circuit breaking faults, and further comprises the following steps:
Collecting current to reduce the line voltage of a target power transmission line corresponding to the fault type;
If the line voltage is smaller than a third voltage threshold value within a third preset time and rises to the initial line voltage after the third preset time, determining that a jumper fault occurs in the current target power transmission line based on phase monitoring operation, wherein the jumper fault comprises a single-phase jumper fault, a double-phase jumper fault and a three-phase jumper fault;
If the line voltage is 0, determining that the current target power transmission line has a circuit breaking fault based on phase monitoring operation, wherein the circuit breaking fault comprises a single-phase circuit breaking fault, a double-phase circuit breaking fault and a three-phase circuit breaking fault.
It should be noted that the third preset time and the third voltage threshold may be adaptively modified based on the user requirement.
In a specific embodiment, for a line with a jumper fault, the jumper fault may cause a sudden decrease in current, for example, the jumper may break or make poor contact, which may cause a break or greatly decrease in current, and the jumper fault may affect the voltage stability of the line. If the jumper wire breaks, voltage drop can be caused, and the quality of power supply is affected.
In a particular embodiment, a circuit break fault may result in a sudden change in current for the line in which the circuit break fault occurred. If a circuit break occurs, the current drops sharply or even to zero, because the continuity of the circuit is interrupted and the current cannot flow. Open circuit faults may cause a drop or extinction of the voltage. In particular, in the vicinity of the fault point, the voltage may drop to zero, whereas the voltage of the device away from the fault point may drop but not completely disappear.
In this embodiment, the phase monitoring operation includes:
acquiring a three-phase power data waveform and a preset normal waveform profile corresponding to a target power transmission line;
extracting the outline of each phase of electric data waveform to obtain a corresponding waveform outline;
Respectively carrying out shape similarity calculation on the normal waveform profile and each waveform profile to obtain a similarity calculation value between each waveform profile and the normal waveform profile;
If the number of waveform profiles with the similarity calculated value being larger than the similarity threshold value is 0, three-phase faults occur;
if the number of waveform profiles with the similarity calculated value being larger than the similarity threshold value is 1, a biphase fault occurs;
if the number of waveform profiles with the similarity calculated value being greater than the similarity threshold value is 2, single-phase faults occur.
In one embodiment, the phase monitoring operation is specifically:
1. And acquiring three-phase electric data waveforms corresponding to the target transmission line, which can be realized by intelligent sensors and a data acquisition system deployed in the line. These data may include time series data of voltage and current.
2. Waveform profile extraction, namely performing profile extraction on each phase of electric data waveform to obtain a corresponding waveform profile. This may be achieved by signal processing techniques such as hilbert transform. The hilbert transform is capable of providing an analytic signal of one signal, the real part of which is the original signal and the imaginary part of which is the envelope of the signal. By taking the modulus of the resolved signal, we can get the envelope of the signal, i.e. the waveform profile.
3. And calculating the similarity, namely calculating the shape similarity of the normal waveform profile and each waveform profile, and obtaining a similarity calculation value between each waveform profile and the normal waveform profile. The similarity calculation may be implemented by various methods, such as cosine similarity, euclidean distance, pearson correlation coefficient, and the like.
4. The fault judgment comprises the steps of generating a three-phase fault if the number of waveform profiles with the similarity calculated value larger than the similarity threshold value is 0, generating a two-phase fault if the number of waveform profiles with the similarity calculated value larger than the similarity threshold value is 1, and generating a single-phase fault if the number of waveform profiles with the similarity calculated value larger than the similarity threshold value is 2.
It should be noted that, the signal envelope, i.e., the envelope of the signal, can be regarded as the contour of the signal waveform, which represents the amplitude variation trend of the signal. By analysing the shape of the envelope we can identify abnormal patterns in the signal which may be related to line faults. Similarity calculation by comparing the similarity of the actual waveform profile to the normal waveform profile, we can quantify the difference between them. If the similarity is below a certain threshold, this indicates a significant change in the waveform, possibly indicating the presence of a line fault.
Step 104, judging whether the intermediate fault type is the same as the initial fault type, if so, determining a final fault type based on the initial fault type and a voltage and current analysis result, and if not, recording a data acquisition position of the target power transmission line and sending the data acquisition position to a maintainer so that the maintainer can go to the data acquisition position for fault investigation.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a power transmission line fault monitoring system according to an embodiment of the present invention, which includes a data acquisition module 201, an initial fault determination module 202, an intermediate fault determination module 203, and a data judgment module 204;
The data acquisition module is used for acquiring monitoring data of the power transmission line, wherein the monitoring data comprises fault codes and electric data corresponding to a line carrying load;
The initial fault determination module is used for analyzing the fault code to obtain an initial fault type, wherein the type of the initial fault type comprises an insulation fault, a grounding fault, a jumper fault, a short circuit fault, an open circuit fault and a flashover fault;
The intermediate fault determining module is used for determining a target load according to the data acquisition position of the target power transmission line based on the target power transmission line corresponding to the fault code, performing voltage and current analysis on the target load and the electric data of the target power transmission line, and determining the type of the intermediate fault;
the data judging module is used for judging whether the intermediate fault type is the same as the initial fault type, if so, determining a final fault type based on the initial fault type and a voltage and current analysis result, and if not, recording a data acquisition position of the target power transmission line and sending the data acquisition position to a maintenance person so that the maintenance person can go to the data acquisition position for fault investigation.
The system item embodiment is corresponding to the method item embodiment of the present invention, and the method for monitoring the power transmission line fault provided by any one of the method item embodiments of the present invention may be implemented.
The method comprises the steps of obtaining an initial fault type through analysis of fault codes, determining a target load according to a data acquisition position of a target power transmission line based on the target power transmission line corresponding to the fault codes, carrying out voltage and current analysis on the target load and electric data of the target power transmission line, determining an intermediate fault type, judging whether the intermediate fault type is identical to the initial fault type, if so, determining a final fault type based on the initial fault type and a voltage and current analysis result, if not, recording the data acquisition position of the target power transmission line, and sending the data acquisition position to maintenance personnel so that the maintenance personnel can go to the data acquisition position for fault investigation. According to the fault type identification method, the fault type identified by the fault code is primarily judged, the load and the line involved in the power transmission line generating the fault code are called to carry out electric data calling, secondary judgment of the fault type is carried out through the electric data, and whether the results of the primary judgment and the secondary judgment are the same or not is compared, so that the type of the fault type is rapidly determined, and the accuracy of monitoring the power transmission line fault is improved.
Example two
Referring to fig. 3, fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
A terminal device of this embodiment comprises a processor 301, a memory 302 and a computer program stored in said memory 302 and executable on said processor 301. The processor 301, when executing the computer program, implements the steps of the above-described respective transmission line fault monitoring method in an embodiment, for example, all the steps of the transmission line fault monitoring method shown in fig. 1. Or the processor may implement the functions of the modules in the above system embodiments when executing the computer program, for example, all the modules of the transmission line fault monitoring system shown in fig. 2.
In addition, an embodiment of the present invention further provides a computer readable storage medium, where the computer readable storage medium includes a stored computer program, and when the computer program runs, the device where the computer readable storage medium is controlled to execute the power transmission line fault monitoring method according to any one of the embodiments.
It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a terminal device and does not constitute a limitation of the terminal device, and may include more or less components than illustrated, or may combine certain components, or different components, e.g., the terminal device may further include an input-output device, a network access device, a bus, etc.
The Processor 301 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 301 is a control center of the terminal device, and connects various parts of the entire terminal device using various interfaces and lines.
The memory 302 may be used to store the computer program and/or module, and the processor 301 may implement various functions of the terminal device by running or executing the computer program and/or module stored in the memory and invoking data stored in the memory 302. The memory 302 may mainly include a storage program area that may store an operating system, an application program required for at least one function (such as a sound playing function, an image playing function, etc.), etc., and a storage data area that may store data created according to the use of a cellular phone (such as audio data, a phonebook, etc.), etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart memory card (SMART MEDIA CARD, SMC), secure Digital (SD) card, flash memory card (FLASH CARD), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Wherein the terminal device integrated modules/units may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as stand alone products. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include any entity or system capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
It should be noted that the system embodiments described above are merely illustrative, and that the units described as separate units may or may not be physically separate, and that units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the system embodiment of the present invention, the connection relationship between the modules represents that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
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| EP2290775A1 (en) * | 2009-08-31 | 2011-03-02 | ABB Research Ltd. | A method of fault phase selection and fault type determination |
| TWI430199B (en) * | 2009-12-10 | 2014-03-11 | Inst Information Industry | Systems and methods for managing machine tools, and computer program products thereof |
| CN116027143A (en) * | 2021-10-26 | 2023-04-28 | 南京南瑞继保电气有限公司 | High-resistance single-phase grounding fault diagnosis method |
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| CN107765123A (en) * | 2017-10-19 | 2018-03-06 | 中领世能（天津）科技有限公司 | Detected rule update method and Electrical Safety monitoring system |
| CN118378841A (en) * | 2024-05-08 | 2024-07-23 | 华电河北新能源有限公司 | Photovoltaic power station two-ticket operation safety control method and system based on multidimensional sensing |
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