CN117269676A - A lightning strike fault location method and device for distribution network line equipment - Google Patents
A lightning strike fault location method and device for distribution network line equipment Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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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
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Abstract
The invention discloses a lightning fault positioning method and device for power distribution network line equipment, wherein the method comprises the following steps: step S1, acquiring three-phase current waveforms of all monitoring terminals in a power distribution network line, wherein the three-phase current waveforms comprise initial traveling waves of lightning current signals and lightning Cheng Hangbo; step S2, determining a lightning stroke interval and a preliminary position of a lightning energy invasion point according to the time difference between an initial traveling wave of a lightning current signal and the arrival time of a lightning dominant wave at each monitoring point on a main line; step S3, determining lightning stroke fault locating points according to the lightning stroke intervals, the preliminary positions of the lightning stroke energy invasion points, the topological structure of the monitoring terminal on the lightning stroke intervals and the arrival time of the wave heads; s4, if the lightning stroke fault locating point is not a node, determining the lightning stroke fault locating point as a final fault point; if the lightning stroke fault locating point is a node, further checking a branch line extending from the node, and determining a final fault point. The invention can improve the efficiency of determining the lightning stroke fault position.
Description
Technical Field
The invention relates to the technical field of lightning protection of power distribution networks, in particular to a lightning stroke fault positioning method and device for power distribution network line equipment.
Background
The current society is highly dependent on electric energy, and a power distribution network in an electric power network bears the task of distributing the electric energy, so that the electric energy is directly provided for users. However, the operation environment of the power distribution network is very bad, and faults easily occur to bring adverse effects to the production and life of people. After the power distribution network fails, how to improve the failure recovery efficiency and reduce the failure outage time are important works in the operation of the power distribution network. Among a plurality of fault types, the probability of occurrence of lightning faults is highest, the tripping rate of the distribution line is 60 to 80 percent of the total tripping rate, the influence is the widest, the position of the fault point is difficult to check, the potential safety hazard is large, the damage to the overhead line of the distribution network is easy to cause, the safety accident is caused, and the fault has become a great factor affecting the safe and stable operation of the distribution network. Thus, rapid identification and accurate localization of lightning strike faults is currently the most desirable problem to be solved.
For the research of lightning stroke faults, a lightning stroke fault positioning method based on a traveling wave theory is suitable for a power transmission line and is considered as one of the most effective fault positioning methods of the power line, and a multi-terminal power transmission line fault distance measuring method based on a double-end traveling wave distance measuring method is proposed by a later learner. And then a learner proposes a method for extracting fault traveling wave arrival of a monitoring terminal by utilizing pole symmetric decomposition and a Teager energy operator, and improves an original lightning stroke fault determination matrix, namely, a time calculation matrix element is utilized, the arrival time of a first reflected wave is utilized after improvement, the influence caused by wave velocity is eliminated, but the method does not solve the problem that monitoring terminals at two ends of a plurality of branch lines cannot effectively monitor the whole line. And foreign scholars propose to install coils on each tower to collect lightning current signals, a distributed monitoring system is established, fault points are positioned by analyzing the magnitude and the polarity of the current signals, but the cost is too high and the effect is very low. And then, taking the problem that the lightning stroke points are inconsistent with the flashover points into consideration, a distributed line lightning stroke fault positioning method based on a non-contact lightning stroke current measuring device is provided, verification is carried out through simulation analysis, and the method is not suitable for a power distribution network with more multilevel branch networks.
The above method has two main problems when applied to a power distribution network: firstly, a power distribution network is complex in structure and multiple in branch lines; secondly, the monitoring terminal cannot effectively monitor the line due to the shunt effect of the branch line.
Disclosure of Invention
The invention aims to solve the technical problem of providing a lightning stroke fault positioning method and device for power distribution network line equipment, so as to improve the lightning stroke fault positioning efficiency and further improve the intelligent and digital level of a power distribution network.
In order to solve the technical problems, the invention provides a lightning stroke fault positioning method for power distribution network line equipment, which comprises the following steps:
step S1, acquiring three-phase current waveforms of all monitoring terminals in a power distribution network line, wherein the three-phase current waveforms comprise initial traveling waves of lightning current signals and lightning Cheng Hangbo;
step S2, determining a lightning stroke interval and a preliminary position of a lightning energy invasion point according to the time difference between an initial traveling wave of a lightning current signal and the arrival time of a lightning dominant wave at each monitoring point on a main line;
step S3, determining lightning stroke fault locating points according to the lightning stroke intervals, the preliminary positions of the lightning stroke energy invasion points, the topological structure of the monitoring terminal on the lightning stroke intervals and the arrival time of the wave heads;
s4, if the lightning stroke fault locating point is not a node, determining the lightning stroke fault locating point as a final fault point; if the lightning stroke fault locating point is a node, further checking a branch line extending from the node, and determining a final fault point.
Preferably, the distribution network line is a three-terminal overhead line, and in step S2, based on a time difference that the traveling wave reaches each monitoring terminal, a distance from the lightning fault to each monitoring terminal is obtained by the following formula:
wherein i and j represent monitoring terminals, i is a starting point, and j is an end point; l (L) icj Representing the distance from the lightning fault point to each monitoring terminal; l (L) ij Representing the distance from the monitoring terminal i to the monitoring terminal j, v represents the speed of the lightning traveling wave, t i 、t j And the time when the lightning traveling wave reaches the monitoring terminal i and the monitoring terminal j respectively is represented.
Preferably, the distance from the lightning stroke fault to each monitoring terminal is divided by the distance from the monitoring terminal to the node to be used as a three-terminal lightning stroke fault positioning matrix element, and the three-terminal lightning stroke fault positioning matrix is obtained as follows:
wherein M is 1 、M 2 、N 1 For monitoring the terminal M 1 As a starting point, M 2 Is the end point; respectively representing the distances from lightning fault points to different monitoring terminals;Respectively represent each monitoring terminal to node T 1 T, T 1 The node farthest from each monitoring terminal in the line.
Preferably, if all elements of a row corresponding to a monitoring point of a certain branch are smaller than 1 and all elements of a column corresponding to the branch are larger than 1, judging that the branch is struck by lightning; and if all matrix elements in the lightning stroke fault locating matrix are equal to 1, judging that the three-terminal network node suffers from lightning stroke.
Preferably, the distribution network line is a multi-terminal overhead line, and the multi-terminal lightning strike fault positioning matrix element a ij The definition is as follows:
wherein i and j represent monitoring terminals, i is a starting point, and j is an end point; l (L) icj Representing the distance from the lightning fault point to each monitoring terminal; l (L) ij Representing monitoring terminal i to node T n T, T n The nodes which are farthest from the monitoring terminal i in the lines at the two ends.
Preferably, the multi-terminal lightning strike fault localization matrix is as follows:
wherein M is 1 、N 1 、……N k 、M 2 For monitoring the terminal M 1 As a starting point, M 2 Is the end point; respectively represent the lightning strike fault points to the monitoring terminal M 1 And monitor terminal N 1 、……N k 、M 2 Is used for the distance of (a),respectively represent the monitoring terminals M 1 To distance monitor terminal M 1 Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal N 1 And monitor terminal M 1 、N 2 …N k 、M 2 Distance of->Respectively represent the monitoring terminals N 1 To distance monitoring terminal N 1 Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal N 2 And monitor terminal M 1 、N 1 、N 3 …N k 、M 2 Distance of->Respectively represent the monitoring terminals N 2 To distance monitoring terminal N 2 Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal N k And monitor terminal M 1 、N 1 、…M 2 Distance of->Respectively represent the monitoring terminals N k To distance monitoring terminal N k Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal M 2 And monitor terminal M 1 、N 1 、…N k Distance of->Respectively represent the monitoring terminals M 2 To distance monitor terminal M 2 Furthest node T n N=1, 2, … k.
Preferably, when all row elements corresponding to a certain monitoring terminal are smaller than 1 and all column elements corresponding to the monitoring terminal are larger than 1, judging that lightning stroke faults occur in a branch corresponding to the monitoring terminal; if the row elements corresponding to a certain monitoring terminal are all smaller than 1 and the column elements corresponding to the monitoring terminal are all equal to 1, determining that lightning stroke faults occur at nodes of a branch where the monitoring terminal is located; if the lightning stroke faults do not belong to the two conditions, the lightning stroke faults are judged to occur on the connecting lines among the nodes.
The invention also provides a lightning stroke fault positioning device of the power distribution network line equipment, which comprises:
the acquisition module is used for acquiring three-phase current waveforms of all monitoring terminals in the power distribution network line, and the three-phase current waveforms comprise initial traveling waves of lightning current signals and lightning Cheng Hangbo;
the primary positioning module is used for determining a lightning stroke interval and a primary position of a lightning energy invasion point according to the time difference between the initial traveling wave of the lightning current signal and the arrival time of the lightning dominant wave at each monitoring point on the main line;
the final positioning module is used for determining lightning stroke fault positioning points according to the lightning stroke interval, the preliminary positions of the lightning stroke energy invasion points, the topological structure of the monitoring terminal on the lightning stroke interval and the arrival time of the wave head;
the fault point determining module is used for determining the lightning stroke fault locating point as a final fault point when the lightning stroke fault locating point is not a node; and further inspecting branch lines extending from the node when the lightning stroke fault locating point is the node, and determining a final fault point.
The implementation of the invention has the following beneficial effects: the embodiment of the invention considers the shunting effect of multiple branches on the main lightning current in the distribution network and the positioning problem of the lightning faults of the secondary branches, and provides a multi-branch distribution network lightning fault positioning method based on a distributed monitoring system.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a lightning fault positioning method for power distribution network line equipment according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a three-terminal overhead line in an embodiment of the invention.
Fig. 3 is a schematic diagram of a multi-terminal overhead line in an embodiment of the invention.
Fig. 4 is a schematic diagram of a simulation program and a monitoring terminal distribution in an embodiment of the present invention.
FIG. 5 is a schematic diagram of the working condition 1 in the simulation process according to the embodiment of the present invention.
FIG. 6 is a schematic diagram of the working condition 2 in the simulation process according to the embodiment of the present invention.
FIG. 7 is a schematic diagram of the working condition 3 in the simulation process according to the embodiment of the present invention.
Detailed Description
The following description of embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced.
Because the distribution network has the problems of numerous branch lines and complex topological structure, the traditional traveling wave method does not consider the branching effect of the branches and the positioning of the secondary branches, and therefore, referring to fig. 1, the first embodiment of the invention provides a lightning stroke fault positioning method for distribution network line equipment, which comprises the following steps:
step S1, acquiring three-phase current waveforms of all monitoring terminals in a power distribution network line, wherein the three-phase current waveforms comprise initial traveling waves of lightning current signals and lightning Cheng Hangbo;
step S2, determining a lightning stroke interval and a preliminary position of a lightning energy invasion point according to the time difference between an initial traveling wave of a lightning current signal and the arrival time of a lightning dominant wave at each monitoring point on a main line;
step S3, determining lightning stroke fault locating points according to the lightning stroke intervals, the preliminary positions of the lightning stroke energy invasion points, the topological structure of the monitoring terminal on the lightning stroke intervals and the arrival time of the wave heads;
s4, if the lightning stroke fault locating point is not a node, determining the lightning stroke fault locating point as a final fault point; if the lightning stroke fault locating point is a node, further checking a branch line extending from the node, and determining a final fault point.
According to the method, the distribution network is divided into different areas according to the method for locating the multi-branch lightning current, the lightning stroke areas are judged according to the polarity of the collected lightning current signals, and the number of current monitoring terminals is used for determining a proper lightning stroke locating matrix, so that the location of lightning stroke faults of the multi-branch distribution network is realized, the lightning stroke fault locating efficiency is improved, quick power restoration is facilitated, and the intelligent and digital level of the distribution network is improved.
Specifically, fig. 2 shows a schematic diagram of a three-terminal overhead line, including a monitoring terminal M 1 、M 2 、N 1 The distance of each monitoring terminal to the node is known. Assume that the time for extracting the lightning current fault traveling wave to reach each monitoring terminal through wavelet transformation singular monitoring isWhenever a lightning strike occurs, the generated current will generate a traveling wave on the overhead line, which reaches each monitoring terminal at a specific time. Wavelet transform singular monitoring techniques are used to extract the arrival times of these traveling waves.
Based on a two-end lightning fault positioning method, for a three-end overhead line, two working conditions of a lightning stroke branch and a lightning stroke node are considered, 3 monitoring terminals are randomly distributed to form 6 two-end networks, and a plurality of possible lightning stroke positions can be obtained. Each lightning stroke position can be calculated through the arrival time of the traveling wave and converted into elements of a positioning matrix, and the calculation formula is as follows:
wherein i and j represent monitoring terminals, i is a starting point, and j is an end point; l (L) icj Representing the distance from the lightning fault point to each monitoring terminal; l (L) ij Representing the distance from the monitoring terminal i to the monitoring terminal j, v represents the speed of the lightning traveling wave, t i 、t j And the time when the lightning traveling wave reaches the monitoring terminal i and the monitoring terminal j respectively is represented.
When a lightning strike fault occurs, a traveling current wave is generated, which travels along the overhead line. The traveling wave can be received by different monitoring terminals at different times, and the distance from the fault point to each monitoring terminal can be calculated based on the difference of the arrival time.
And (3) calculating the distance from the lightning stroke fault to each monitoring terminal according to the formula (1) based on the time difference of the traveling wave reaching each monitoring terminal.
Dividing the distance obtained by the formula (1) by the distance from the monitoring terminal to the node to serve as matrix elements, determining a three-terminal lightning stroke fault positioning matrix, and providing lightning stroke criteria at different positions through the characteristics of the matrix elements under different faults:
wherein M is 1 、M 2 、N 1 For monitoring the terminal M 1 As a starting point, M 2 Is the end point; respectively representing the distances from lightning fault points to different monitoring terminals;Respectively represent each monitoring terminal to node T 1 T, T 1 The node farthest from each monitoring terminal in the line.
Dividing the distance calculated in the formula (1) by the distance from the monitoring terminal to the node, and taking the quotient as an element of the lightning stroke fault positioning matrix. These distance values can be normalized in such a way that they lie within a specific range (e.g., 0 to 1), so that analysis and fault determination can be made more easily. In the lightning stroke fault positioning matrix, if all elements of a row corresponding to monitoring points of a certain branch are smaller than 1 and all elements of a column corresponding to the branch are larger than 1, the branch can be judged to be struck by lightning. When all elements in the lightning fault locating matrix are equal to 1, the three-terminal network node can be judged to be struck by lightning. If all matrix elements in the lightning fault locating matrix are equal to 1, it can be determined that the three-terminal network node is suffering from lightning. The lightning fault judging method of the multi-terminal overhead line is similar to that of the three-terminal overhead line, and fig. 3 is a schematic diagram of the multi-terminal overhead line.
To adapt the lightning fault location matrix to a multi-terminal overhead line, modification of matrix elements is required, and the definition elements are shown in formula (3).
Wherein i and j represent monitoring terminals, i is a starting point, and j is an end point; l (L) icj Representing the distance from the lightning fault point to each monitoring terminal; l (L) ij Representing monitoring terminal i to node T n T, T n The nodes which are farthest from the monitoring terminal i in the lines at the two ends.
Two monitoring terminals of the multi-terminal overhead line are i and j respectively, i is used as a starting point, j is used as an end point, and the element definition is used for generating a lightning stroke fault positioning matrix conforming to the figure 3, as shown in a formula (4):
wherein M is 1 、N 1 、……N k 、M 2 For monitoring the terminal M 1 As a starting point, M 2 Is the end point; respectively represent the lightning strike fault points to the monitoring terminal M 1 And monitor terminal N 1 、……N k 、M 2 Is used for the distance of (a),respectively represent the monitoring terminals M 1 To distance monitor terminal M 1 Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal N 1 And monitor terminal M 1 、N 2 …N k 、M 2 Distance of->Respectively represent the monitoring terminals N 1 To distance monitoring terminal N 1 Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal N 2 And monitor terminal M 1 、N 1 、N 3 …N k 、M 2 Distance of->Respectively represent the monitoring terminals N 2 To distance monitoring terminal N 2 Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal N k And monitor terminal M 1 、N 1 、…M 2 Distance of->Respectively represent the monitoring terminals N k To distance monitoring terminal N k Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal M 2 And monitor terminal M 1 、N 1 、…N k Distance of->Respectively represent the monitoring terminals M 2 To distance monitor terminal M 2 Furthest node T n N=1, 2, … k.
According to the method for positioning the lightning stroke faults of the multi-terminal overhead line, when all row elements corresponding to a certain monitoring terminal are smaller than 1 and all column elements corresponding to the monitoring terminal are larger than 1, the lightning stroke faults of the branch corresponding to the monitoring terminal can be judged. If the row elements corresponding to a certain monitoring terminal are smaller than 1 and the column elements corresponding to the monitoring terminal are equal to 1, the occurrence of lightning stroke faults at the nodes of the branch where the monitoring terminal is located can be determined. If the lightning stroke fault does not belong to the two conditions, the lightning stroke fault can be judged to occur on the connecting line between the nodes.
In the embodiment of the invention, a certain actual power distribution network line is taken as an example, the total length of the power distribution network line is 35.991km, the power distribution network line contains 492 concrete towers, the total length of a wire is 35.991km, the total length of a main line is 10.9km, the main line is provided with 78 towers, wherein 2 main lines and 18 minor lines are arranged, the main line comprises 3-4 levels of branch lines, the main line mainly adopts Lgj-50 wires, the average span 142m of the main line, the average span 106m of the branch line 1 and the average span 85m of the branch line 2. In the electromagnetic transient simulation program PSCAD/EMTDC, the electromagnetic transient process of the lightning stroke fault of the distribution network line is simulated, the 10kV distribution network simulation program is set as shown in fig. 4, and only branch lines with monitoring terminals are shown in fig. 4.
1. A lightning strike fault occurs in the branch between the monitoring terminal 1 and the monitoring terminal 2, the working conditions of which are shown in fig. 5.
Firstly, judging lightning stroke intervals according to the polarity of lightning current signals collected by a main line monitoring terminal to obtain currents of the monitoring terminal 1 and the monitoring terminal 2.
Because the line of the section has only two monitoring terminals, the double-end positioning method is adopted for positioning, and the polarity of the lightning current of the two terminals is opposite according to the polarity comparison of the collected lightning current signals, so that the lightning fault is determined to occur on the line between the monitoring terminal 1 and the monitoring terminal 2.
The time point when the maximum value after wavelet transformation occurs is extracted, and the time for the lightning current traveling wave to reach the monitoring terminal 1 is 9.26 mu s, and the time for the lightning current traveling wave to reach the monitoring terminal 2 is 7.35 mu s. The calculation result is l 1c2 ＝2274.11m,l 2c1 = 1701.89m. The distance from the node between the lightning-protection branch line and the main line to the monitoring terminal 1 is 2272m, and the distance from the node between the lightning-protection branch line and the main line to the monitoring terminal 2 is 1704m. And finally determining the lightning strike fault point as a node between the lightning branch line and the main line, wherein the positioning error is 0.093%. At this time, it is necessary to check the branch line to which the corresponding positioning node extends.
2. The lightning strike fault occurs in the secondary branch on branch 1, and the working conditions are shown in fig. 6.
And judging the lightning stroke interval according to the polarity of the lightning stroke current signal to obtain a current waveform schematic diagram.
The section has 2, 3 and 5 monitoring terminals, so that the three-terminal lightning fault positioning technology is adopted, the time for the lightning fault traveling wave to reach the monitoring terminal 2 is 19.78 mu s, the time for the lightning fault traveling wave to reach the monitoring terminal 3 is 20.22 mu s, and the time for the lightning fault traveling wave to reach the monitoring terminal 5 is 13.40 mu s. Three-terminal network lightning stroke fault positioning matrix A 1 The calculation is shown as formula (5):
correcting the calculation error to obtain a matrix A 2 The calculation is shown as formula (6):
from the above, the row elements corresponding to the monitoring terminal 5 are smaller than 1, the column elements are larger than 1, and the lightning fault can be positioned on the fixed branch line where the monitoring terminal 5 is located, i c5 The distance to the monitoring terminal 5 is calculated as shown in formula (7):
the set lightning fault point is located at the tail end of the secondary branch and the distance from the monitoring terminal 5 is 1908m. And since the secondary branch is not provided with a monitoring terminal, it is finally positioned as a node of the branch and the branch 1. The final positioning error is 0.038% and the branch line to which the corresponding node extends needs to be checked.
3. The lightning strike fault occurs in the branch 2, and the working condition diagram is shown in fig. 7.
And determining the lightning stroke fault position according to the polarity of the lightning stroke current traveling wave, and monitoring the current waveforms of the terminal 8 and the terminal 9.
A lightning stroke fault determination matrix A is obtained by adopting a four-terminal lightning stroke fault positioning method 3 As shown in formula (8):
correcting the calculation error to obtain a matrix A 4 The calculation is shown as formula (9):
as can be obtained from the above equation, all row elements corresponding to the monitoring terminal 6 are smaller than 1, and all column elements corresponding to the monitoring terminal are larger than 1. It can be seen that the lightning fault location point is on the line to which the monitoring terminal 6 corresponds. The distance from this point to the monitoring terminal 6 is shown in formula (10):
the distance between the lightning fault point and the set monitoring terminal in the simulation is 3145m, and the positioning error is 0.13%; and the point is not a node, the lightning strike fault location point can be determined to be the final fault point.
Corresponding to the foregoing embodiment of the present invention, which is a lightning strike fault positioning method for power distribution network line equipment, a second embodiment of the present invention provides a lightning strike fault positioning device for power distribution network line equipment, including:
the acquisition module is used for acquiring three-phase current waveforms of all monitoring terminals in the power distribution network line, and the three-phase current waveforms comprise initial traveling waves of lightning current signals and lightning Cheng Hangbo;
the primary positioning module is used for determining a lightning stroke interval and a primary position of a lightning energy invasion point according to the time difference between the initial traveling wave of the lightning current signal and the arrival time of the lightning dominant wave at each monitoring point on the main line;
the final positioning module is used for determining lightning stroke fault positioning points according to the lightning stroke interval, the preliminary positions of the lightning stroke energy invasion points, the topological structure of the monitoring terminal on the lightning stroke interval and the arrival time of the wave head;
the fault point determining module is used for determining the lightning stroke fault locating point as a final fault point when the lightning stroke fault locating point is not a node; and further inspecting branch lines extending from the node when the lightning stroke fault locating point is the node, and determining a final fault point.
For the working principle and process of the present embodiment, please refer to the description of the first embodiment of the present invention, and the description is omitted here.
Compared with the prior art, the lightning stroke fault positioning method for the multi-branch distribution network has the advantages that the distribution network is divided into different areas by combining the multi-branch fault positioning method based on wavelet transformation singularity monitoring and traveling wave theory by taking the problems of the split effect of multiple branches on the main lightning current and the positioning of the secondary branch lightning stroke faults in the distribution network into consideration, and the lightning stroke positioning matrix is determined by the number of current monitoring terminals, so that the positioning of the lightning stroke faults of the multi-branch distribution network is realized, the lightning stroke fault positioning efficiency is improved, the quick power recovery is facilitated, and the intelligent and digital level of the distribution network is improved.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (8)
1. The lightning stroke fault positioning method for the power distribution network line equipment is characterized by comprising the following steps of:
step S1, acquiring three-phase current waveforms of all monitoring terminals in a power distribution network line, wherein the three-phase current waveforms comprise initial traveling waves of lightning current signals and lightning Cheng Hangbo;
step S2, determining a lightning stroke interval and a preliminary position of a lightning energy invasion point according to the time difference between an initial traveling wave of a lightning current signal and the arrival time of a lightning dominant wave at each monitoring point on a main line;
step S3, determining lightning stroke fault locating points according to the lightning stroke intervals, the preliminary positions of the lightning stroke energy invasion points, the topological structure of the monitoring terminal on the lightning stroke intervals and the arrival time of the wave heads;
s4, if the lightning stroke fault locating point is not a node, determining the lightning stroke fault locating point as a final fault point; if the lightning stroke fault locating point is a node, further checking a branch line extending from the node, and determining a final fault point.
2. The method according to claim 1, wherein the distribution network line is a three-terminal overhead line, and in the step S2, the distance from the lightning fault to each monitoring terminal is calculated based on the time difference between the traveling wave and each monitoring terminal by the following formula:
wherein i and j represent monitoring terminals, i is a starting point, and j is an end point; l (L) icj Representing the distance from the lightning fault point to each monitoring terminal; l (L) ij Representing the distance from the monitoring terminal i to the monitoring terminal j, v represents the speed of the lightning traveling wave, t i 、t j And the time when the lightning traveling wave reaches the monitoring terminal i and the monitoring terminal j respectively is represented.
3. The method according to claim 2, wherein the distance from the lightning strike fault to each monitoring terminal is divided by the distance from the monitoring terminal to the node as three-terminal lightning strike fault location matrix element, and the three-terminal lightning strike fault location matrix is obtained as follows:
wherein M is 1 、M 2 、N 1 For monitoring the terminal M 1 As a starting point, M 2 Is the end point; respectively representing the distances from lightning fault points to different monitoring terminals;Respectively represent each monitoring terminal to node T 1 T, T 1 The node farthest from each monitoring terminal in the line.
4. A method according to claim 3, wherein if all of the row elements corresponding to a monitoring point of a branch are less than 1 and all of the column elements corresponding to the branch are greater than 1, determining that the branch is struck by lightning; and if all matrix elements in the lightning stroke fault locating matrix are equal to 1, judging that the three-terminal network node suffers from lightning stroke.
5. The method of claim 1, wherein the distribution network line is a multi-terminal overhead line, a multi-terminal lightning strike fault location matrix element a ij The definition is as follows:
wherein i and j represent monitoring terminals, i is a starting point, and j is an end point; l (L) icj Representing the distance from the lightning fault point to each monitoring terminal; l (L) ij Representing monitoring terminal i to node T n T, T n The nodes which are farthest from the monitoring terminal i in the lines at the two ends.
6. The method of claim 5, wherein the multi-terminal lightning strike fault localization matrix is as follows:
wherein M is 1 、N 1 、……N k 、M 2 For monitoring the terminal M 1 As a starting point, M 2 Is the end point; respectively represent the lightning strike fault points to the monitoring terminal M 1 And monitor terminal N 1 、……N k 、M 2 Distance of->Respectively represent the monitoring terminals M 1 To distance monitor terminal M 1 Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal N 1 And monitor terminal M 1 、N 2 …N k 、M 2 Distance of->Respectively represent the monitoring terminals N 1 To distance monitoring terminal N 1 Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal N 2 And monitor terminal M 1 、N 1 、N 3 …N k 、M 2 Distance of->Respectively represent the monitoring terminals N 2 To distance monitoring terminal N 2 Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal N k And monitor terminal M 1 、N 1 、…M 2 Distance of->Respectively represent the monitoring terminals N k To distance monitoring terminal N k Furthest node T n N=1, 2, … k;
respectively represent the lightning strike fault points to the monitoring terminal M 2 And monitor terminal M 1 、N 1 、…N k Distance of->Respectively represent the monitoring terminals M 2 To distance monitor terminal M 2 Furthest node T n N=1, 2, … k.
7. The method of claim 6, wherein when all row elements corresponding to a certain monitoring terminal are smaller than 1 and all column elements corresponding to the monitoring terminal are larger than 1, determining that a lightning stroke fault occurs in a branch corresponding to the monitoring terminal; if the row elements corresponding to a certain monitoring terminal are all smaller than 1 and the column elements corresponding to the monitoring terminal are all equal to 1, determining that lightning stroke faults occur at nodes of a branch where the monitoring terminal is located; if the lightning stroke faults do not belong to the two conditions, the lightning stroke faults are judged to occur on the connecting lines among the nodes.
8. A lightning strike fault locating device for line equipment of a power distribution network, comprising:
the acquisition module is used for acquiring three-phase current waveforms of all monitoring terminals in the power distribution network line, and the three-phase current waveforms comprise initial traveling waves of lightning current signals and lightning Cheng Hangbo;
the primary positioning module is used for determining a lightning stroke interval and a primary position of a lightning energy invasion point according to the time difference between the initial traveling wave of the lightning current signal and the arrival time of the lightning dominant wave at each monitoring point on the main line;
the final positioning module is used for determining lightning stroke fault positioning points according to the lightning stroke interval, the preliminary positions of the lightning stroke energy invasion points, the topological structure of the monitoring terminal on the lightning stroke interval and the arrival time of the wave head;
the fault point determining module is used for determining the lightning stroke fault locating point as a final fault point when the lightning stroke fault locating point is not a node; and further inspecting branch lines extending from the node when the lightning stroke fault locating point is the node, and determining a final fault point.
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| CN119024151A (en) * | 2024-08-15 | 2024-11-26 | 江苏威伦智能电气设备有限公司 | A traveling wave fault location and ranging primary and secondary fusion pole-mounted circuit breaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119024151A (en) * | 2024-08-15 | 2024-11-26 | 江苏威伦智能电气设备有限公司 | A traveling wave fault location and ranging primary and secondary fusion pole-mounted circuit breaker |
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