CN118501622B - Method, device and system for accurately positioning line faults of low-voltage transformer area - Google Patents
- ️Tue Nov 19 2024
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Publication number
- CN118501622B CN118501622B CN202410980897.2A CN202410980897A CN118501622B CN 118501622 B CN118501622 B CN 118501622B CN 202410980897 A CN202410980897 A CN 202410980897A CN 118501622 B CN118501622 B CN 118501622B Authority
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000001360 synchronised effect Effects 0.000 claims abstract description 19
- 238000012216 screening Methods 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 claims description 16
- 238000000691 measurement method Methods 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 4
- 238000012876 topography Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 238000010606 normalization Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Classifications
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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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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- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
本发明涉及探测线路故障技术领域，具体涉及一种低压台区线路故障精准定位方法、装置及系统，包括：获取每次线路故障时每个电磁波接收设备接收到的电磁波信号的质量；根据最近一个月线路故障时电磁波接收设备与故障线路之间的距离、电磁波信号的质量的同步变化情况，得到每个电磁波接收设备的受干扰度；根据最近一次线路故障时电磁波接收设备接收到的电磁波信号的质量及受干扰度，筛选若干关键电磁波接收设备，定位线路故障的准确位置。本发明提高了线路故障精准定位的准确性和效率。
The present invention relates to the technical field of detecting line faults, and specifically to a method, device and system for accurately locating line faults in low-voltage substations, including: obtaining the quality of electromagnetic wave signals received by each electromagnetic wave receiving device each time a line fault occurs; obtaining the interference degree of each electromagnetic wave receiving device based on the synchronous changes in the distance between the electromagnetic wave receiving device and the faulty line and the quality of the electromagnetic wave signal during the line fault in the most recent month; screening a number of key electromagnetic wave receiving devices based on the quality and interference degree of the electromagnetic wave signals received by the electromagnetic wave receiving device during the most recent line fault, and locating the exact position of the line fault. The present invention improves the accuracy and efficiency of accurately locating line faults.
Description
Technical Field
The invention relates to the technical field of line fault detection, in particular to a method, a device and a system for accurately positioning line faults of a low-voltage transformer area.
Background
The low voltage area is the end in the power system and is directly related to the reliability and quality of the power supply for the user. Therefore, once a line fault occurs, it is important to locate and repair the fault accurately in time.
The existing line fault accurate positioning is mainly to determine an approximate range area of a line fault, then to conduct investigation on the approximate range area based on a fault current measurement method, and to position the accurate position of the line fault; when the line fault key range area is positioned, as the electromagnetic wave receiving equipment is interfered by the surrounding topography of the low-voltage station area, the buildings and other factors, the quality of the electromagnetic wave signals received by the equipment is possibly poor, meanwhile, the electromagnetic wave receiving equipment is also interfered, if the quality of the electromagnetic wave signals received by the equipment and the interference degree of the equipment are not analyzed, the positioned line fault key range area is deviated, and the line fault accurate positioning efficiency is not high.
Disclosure of Invention
In order to solve the problems, the invention provides a method, a device and a system for accurately positioning line faults of a low-voltage transformer area.
The invention discloses a method, a device and a system for accurately positioning line faults of a low-voltage transformer area, which adopts the following technical scheme:
The embodiment of the invention provides a method for accurately positioning line faults of a low-voltage transformer area, which comprises the following steps:
The method comprises the steps that when a line fails in the last month or in the last time, electromagnetic wave signals received by each electromagnetic wave receiving device, the intensity of the electromagnetic wave signals, the arrival time of the electromagnetic wave signals and the source direction of the electromagnetic wave signals are obtained in a low-voltage station respectively, and the distance between the electromagnetic wave receiving device and the failed line is obtained;
acquiring the quality of an electromagnetic wave signal received by each electromagnetic wave receiving device when each line fails according to the intensity and the arrival time of the electromagnetic wave signal when the line fails;
Obtaining the interference degree of each electromagnetic wave receiving device according to the distance between the electromagnetic wave receiving device and the fault line and the synchronous change condition of the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line is in fault in the last month;
Screening a plurality of key electromagnetic wave receiving devices according to the quality of an electromagnetic wave signal received by the electromagnetic wave receiving device and the interference degree of the electromagnetic wave receiving device when the last line fails; and positioning the accurate position of the line fault according to the source direction of the electromagnetic wave signal received by the key electromagnetic wave receiving equipment in the last line fault.
Further, the method for obtaining the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device when each line fails according to the intensity and the arrival time of the electromagnetic wave signal when the line fails comprises the following specific steps:
For the first line fault of the last month, acquiring the arrival time of the electromagnetic wave signals received by all the electromagnetic wave receiving devices in the first line fault, taking the earliest arrival time as a reference arrival time, and taking the time difference between the arrival time of the electromagnetic wave signals received by each electromagnetic wave receiving device and the reference arrival time as the relative arrival time of the electromagnetic wave signals received by each electromagnetic wave receiving device in the first line fault;
And acquiring the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device when each line fails according to the intensity and the relative arrival time of the electromagnetic wave signal when the line fails.
Further, the method for obtaining the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device when each line fails according to the intensity and the relative arrival time of the electromagnetic wave signal when the line fails comprises the following specific steps:
and for any electromagnetic wave receiving device in any line fault, acquiring the intensity and the relative arrival time of an electromagnetic wave signal received by the electromagnetic wave receiving device in the line fault, recording the intensity and the relative arrival time as a first intensity and a first relative arrival time, and fusing the first intensity and the first relative arrival time to obtain the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device in the line fault, wherein the quality is a normalized value.
Further, the step of obtaining the interference degree of each electromagnetic wave receiving device according to the distance between the electromagnetic wave receiving device and the fault line and the synchronous change condition of the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line is in fault in the last month comprises the following specific steps:
Acquiring a quality sequence of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line fails every month according to the quality of the electromagnetic wave signal, and acquiring a distance sequence between the electromagnetic wave receiving device and the failed line when the line fails every month according to the distance between the electromagnetic wave receiving device and the failed line;
For any electromagnetic wave receiving device in the case of any line fault in the last month, acquiring the sequence value of the quality of an electromagnetic wave signal received by the electromagnetic wave receiving device in the corresponding quality sequence in the case of the line fault, acquiring the sequence value of the distance between the electromagnetic wave receiving device and the fault line in the corresponding distance sequence in the case of the line fault, and taking the difference of the sequence value of the quality in the corresponding quality sequence and the sequence value of the distance in the corresponding distance sequence as the initial interference degree of the electromagnetic wave receiving device in the case of the line fault; taking the ratio of the distance between the electromagnetic wave receiving equipment and the fault line when the line is in fault and the sum of the distances between all the electromagnetic wave receiving equipment and the fault line as the attention weight of the electromagnetic wave receiving equipment when the line is in fault; fusing the initial interference degree and the attention weight to obtain a weighted initial interference degree; and fusing all weighted initial interference degrees of the electromagnetic wave receiving equipment when all lines fail in the last month to obtain the interference degrees of the electromagnetic wave receiving equipment, wherein the interference degrees are normalized values.
Further, the step of acquiring the quality sequence of the electromagnetic wave signal received by the electromagnetic wave receiving device every time of line fault in the last month according to the quality of the electromagnetic wave signal comprises the following specific steps:
Acquiring the quality of an electromagnetic wave signal received by each electromagnetic wave receiving device every time of line fault in the last month; and (3) for any line fault in the last month, arranging the quality of the electromagnetic wave signals received by all the electromagnetic wave receiving devices in the time of the line fault in the order from large to small to obtain a quality sequence of the electromagnetic wave signals received by the electromagnetic wave receiving devices in the time of the line fault.
Further, according to the distance between the electromagnetic wave receiving device and the fault line, the distance sequence between the electromagnetic wave receiving device and the fault line is obtained every time the line is faulty in the last month, and the method comprises the following specific steps:
Acquiring the distance between each electromagnetic wave receiving device and a fault line every time the line fails in the last month; and for any line fault in the last month, arranging the distances between all electromagnetic wave receiving devices and the fault line in the order from small to large when the secondary line is in fault, and obtaining a distance sequence between the electromagnetic wave receiving devices and the fault line when the secondary line is in fault.
Further, the screening of the plurality of key electromagnetic wave receiving devices according to the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device and the interference degree of the electromagnetic wave receiving device when the last line fails comprises the following specific steps:
For any electromagnetic wave receiving device, acquiring the quality of an electromagnetic wave signal received by the electromagnetic wave receiving device when the line fails last time, acquiring the interference degree of the electromagnetic wave receiving device, and fusing the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line fails last time and the interference degree of the electromagnetic wave receiving device to acquire the accuracy of the electromagnetic wave signal received by the electromagnetic wave receiving device, wherein the accuracy is a normalized value;
A first threshold value is preset, and all electromagnetic wave receiving devices with the accuracy being greater than or equal to the first threshold value are used as key electromagnetic wave receiving devices.
Further, the method for locating the accurate position of the line fault according to the source direction of the electromagnetic wave signal received by the key electromagnetic wave receiving device in the last line fault comprises the following specific steps:
Acquiring a straight line where the source direction of the electromagnetic wave signal received by each key electromagnetic wave receiving device in the last line fault is located, acquiring an intersection point of the straight lines where the source directions of the electromagnetic wave signals received by all key electromagnetic wave receiving devices in the last line fault are located, and taking a region corresponding to a minimum circumscribed circle containing all intersection points as a line fault key range region;
the method is used for checking the key range area of the line fault based on the fault current measurement method, and locating the accurate position of the line fault.
The invention further provides a device for accurately positioning the line fault of the low-voltage transformer area, which comprises the following components: an electromagnetic wave receiving device, a distance measuring device and a data processor; the electromagnetic wave receiving equipment is used for respectively acquiring an electromagnetic wave signal, the intensity of the electromagnetic wave signal, the arrival time of the electromagnetic wave signal and the source direction of the electromagnetic wave signal received by each electromagnetic wave receiving equipment when the line fails in the last month and the line fails in the last time in the low-voltage station; the distance measuring equipment is used for acquiring the distance between the electromagnetic wave receiving equipment and the fault line; the data processor is used for realizing the steps.
The invention further provides a system for precisely positioning the line faults of the low-voltage transformer area, which comprises a memory and a processor, wherein the processor executes a computer program stored in the memory so as to realize the steps of the method.
The technical scheme of the invention has the beneficial effects that: after the electromagnetic wave signal, the intensity of the electromagnetic wave signal, the arrival time of the electromagnetic wave signal, the source direction of the electromagnetic wave signal and the distance between equipment and a fault line are obtained when the line faults are about, the quality of the electromagnetic wave signal received by each electromagnetic wave receiving equipment when each line fault is obtained through the intensity and the arrival time of the electromagnetic wave signal when the line faults are about, the influence of the arrival time of the electromagnetic wave signal received by different electromagnetic wave receiving equipment is reduced, and the accuracy of determining the quality of the electromagnetic wave signal received by the electromagnetic wave receiving equipment is improved; when the quality of the electromagnetic wave signal received by the electromagnetic wave receiving equipment is obtained, the interference of the surrounding topography of a low-voltage station area, buildings and other factors is reduced by analyzing the intensity and the relative arrival time of the electromagnetic wave signal when a line is in fault, so that the quality quantification is more accurate; obtaining the interference degree of each electromagnetic wave receiving device by analyzing the distance between the electromagnetic wave receiving device and the fault line and the synchronous change condition of the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line is in fault in the last month; the interference degree is analyzed based on a historical period of time, namely the distance between the equipment and the fault line in the last month and the synchronous change condition of the quality of electromagnetic wave signals received by the equipment, so that the interference degree of the equipment is quantified more accurately; and finally, screening a plurality of key electromagnetic wave receiving devices according to the quality of electromagnetic wave signals received by the electromagnetic wave receiving devices and the interference degree of the electromagnetic wave receiving devices when the line fails last time, positioning the accurate position of the line failure, and improving the accuracy and efficiency of accurate positioning of the line failure.
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 flowchart of a method for precisely positioning a line fault in a low-voltage transformer area according to an embodiment of the present invention;
Fig. 2 is a flow chart of locating an accurate location of a line fault according to an embodiment of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following is a detailed description of specific implementation, structure, characteristics and effects of a method, a device and a system for accurately positioning line faults of a low-voltage transformer area according to the invention in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" means that the embodiments are not necessarily the same. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The invention provides a method, a device and a system for accurately positioning line faults of a low-voltage transformer area.
Referring to fig. 1 and 2, a step flowchart of a method for precisely locating a line fault in a low-voltage transformer area and a flowchart for locating an accurate position of the line fault according to an embodiment of the present invention are shown, where the method includes the following steps:
Step S001, respectively acquiring the electromagnetic wave signal, the intensity of the electromagnetic wave signal, the arrival time of the electromagnetic wave signal and the source direction of the electromagnetic wave signal received by each electromagnetic wave receiving device when the line fails in the last month and the line fails in the last time in the low-voltage station, wherein the distance between the electromagnetic wave receiving device and the failed line is obtained.
It should be noted that, the main purpose of this embodiment is to obtain the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device when each line fails, and then screen a plurality of key electromagnetic wave receiving devices according to the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device and the interference of the electromagnetic wave receiving device when the line fails last time, so as to locate the accurate position of the line failure; before starting the analysis, the relevant data is first acquired.
Specifically, the low-voltage station respectively acquires the electromagnetic wave signal, the intensity of the electromagnetic wave signal, the arrival time of the electromagnetic wave signal and the source direction of the electromagnetic wave signal received by each electromagnetic wave receiving device when the line fails in the last month and the line fails in the last time, and the distance between the electromagnetic wave receiving device and the failed line.
It should be noted that, the method of acquiring the received electromagnetic wave signal, the intensity of the electromagnetic wave signal, the arrival time of the electromagnetic wave signal, and the source direction of the electromagnetic wave signal by the electromagnetic wave receiving device is the existing method, and the embodiment is not repeated; the last month line fault does not include the last line fault; in this embodiment, there are a plurality of electromagnetic wave receiving devices, the specific number of which is not limited, and the electromagnetic wave receiving devices are distributed at different positions in the low-voltage station area; in this embodiment, when the line fails, the electromagnetic wave signals received by the device are mainly analyzed, if the electromagnetic wave receiving device has electromagnetic wave signals in multiple source directions, the electromagnetic wave signals with the maximum signal strength are analyzed so as to avoid noise interference, and no special description exists in the following steps, the electromagnetic wave signals refer to the corresponding electromagnetic wave signals when the line fails.
Thus, the electromagnetic wave signal, the intensity of the electromagnetic wave signal, the arrival time of the electromagnetic wave signal and the source direction of the electromagnetic wave signal received by each electromagnetic wave receiving device at each line fault in the last month and at the last line fault are obtained.
Step S002, obtaining the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device at each line fault according to the intensity and arrival time of the electromagnetic wave signal at the line fault.
It should be noted that, in order to facilitate the subsequent analysis and reduce the influence of the arrival time of the electromagnetic wave signals received by different electromagnetic wave receiving devices, it is necessary to unify the arrival times of the electromagnetic wave signals received by all the electromagnetic wave receiving devices and obtain the relative arrival times.
Specifically, according to the intensity and arrival time of the electromagnetic wave signal at the time of line failure, the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device at each time of line failure is obtained, including the steps of:
First, the relative arrival time of the electromagnetic wave signal received by each electromagnetic wave receiving apparatus at each line fault is acquired based on the arrival time of the electromagnetic wave signal.
Secondly, the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device at each line fault is obtained according to the intensity and the relative arrival time of the electromagnetic wave signal at the line fault.
Specifically, according to the arrival time of the electromagnetic wave signal, the relative arrival time of the electromagnetic wave signal received by each electromagnetic wave receiving device at each line fault is obtained, specifically as follows:
For the first line fault of the last month, acquiring the arrival time of the electromagnetic wave signals received by all the electromagnetic wave receiving devices in the first line fault, taking the earliest arrival time as a reference arrival time, and taking the time difference between the arrival time of the electromagnetic wave signals received by each electromagnetic wave receiving device and the reference arrival time as the relative arrival time of the electromagnetic wave signals received by each electromagnetic wave receiving device in the first line fault.
It should be noted that, since the signal performance of the electromagnetic wave receiving device may be interfered by the terrain surrounding the low-voltage transformer area and the factors such as the building, the quality of the electromagnetic wave signal received by the device may be affected, and if the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device is not analyzed, it may affect the accuracy of receiving the electromagnetic wave signal by the device, so that it is necessary to analyze the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device, since the quality of the electromagnetic wave signal is mainly related to the intensity and the relative arrival time of the electromagnetic wave signal received by the device, for example, the stronger the intensity and the shorter the relative arrival time of the electromagnetic wave signal received by the device, the closer the distance between the electromagnetic wave receiving device and the fault line is, the higher the quality of the electromagnetic wave signal received by the device should be, so that the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device when the line is failed is obtained by analyzing the intensity and the relative arrival time of the electromagnetic wave signal received by the device.
Preferably, the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device at each line fault is obtained according to the intensity and the relative arrival time of the electromagnetic wave signal at the line fault, specifically as follows:
and for any electromagnetic wave receiving device in any line fault, acquiring the intensity and the relative arrival time of an electromagnetic wave signal received by the electromagnetic wave receiving device in the line fault, recording the intensity and the relative arrival time as a first intensity and a first relative arrival time, and fusing the first intensity and the first relative arrival time to obtain the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device in the line fault, wherein the quality is a normalized value.
As a specific example, the specific method for acquiring the quality of the electromagnetic wave signal is as follows:
Wherein q g,n is the intensity of the electromagnetic wave signal received by the nth electromagnetic wave receiving device when the nth line fails; t g,n is the relative arrival time of the electromagnetic wave signal received by the nth electromagnetic wave receiving device in the case of the g-th line fault, and it should be noted that if the relative arrival time is 0, the minimum value of all the relative arrival times in the case of the line fault is added to prevent the situation that the denominator is 0 and cannot be calculated; sigmoid () is a sigmoid function for normalization; q g,n is the quality of the electromagnetic wave signal received by the nth electromagnetic wave receiving device at the time of the g-th line failure.
It should be noted that, since the quality of the electromagnetic wave signal is mainly related to the intensity and the relative arrival time of the electromagnetic wave signal received by the device, when the intensity of the electromagnetic wave signal received by the device is stronger, i.e. Q g,n is larger, and the relative arrival time is shorter, i.e. t g,n is smaller, it is explained that the closer the distance between the electromagnetic wave receiving device and the fault line is, the higher the quality of the electromagnetic wave signal received by the device is, i.e. Q g,n is larger, so that the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device at the time of line fault is obtained by analyzing the intensity and the relative arrival time of the electromagnetic wave signal received by the device.
Thus, the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device at each line fault is obtained.
Step S003, obtaining the interference degree of each electromagnetic wave receiving device according to the distance between the electromagnetic wave receiving device and the fault line when the line is in fault in the last month and the synchronous change condition of the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device.
It should be noted that, the accuracy of the electromagnetic wave signal received by the electromagnetic wave receiving device is also related to the interference degree of the device, when the interference to the device is smaller, the more accurate the electromagnetic wave signal received by the device is, the less the interference to the surrounding topography of the low-voltage station area and factors such as buildings is caused, so that the interference degree of the device is also required to be analyzed, and the interference degree of the device is mainly related to the quality of the electromagnetic wave signal and the synchronous change of the distance between the device and the fault line, so that the quality sequence of the electromagnetic wave signal received by the electromagnetic wave receiving device and the distance sequence between the device and the fault line when any line is in fault need to be acquired at first for subsequent better analysis.
Specifically, according to the synchronous change condition of the distance between the electromagnetic wave receiving device and the fault line and the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device when the fault line is in the last month, the interference degree of each electromagnetic wave receiving device is obtained, and the method comprises the following steps:
Firstly, according to the quality of electromagnetic wave signals, acquiring a quality sequence of the electromagnetic wave signals received by the electromagnetic wave receiving device when the line fails every month recently, and according to the distance between the electromagnetic wave receiving device and the failed line, acquiring a distance sequence between the electromagnetic wave receiving device and the failed line when the line fails every month recently.
And secondly, obtaining the interference degree of each electromagnetic wave receiving device according to the distance between the electromagnetic wave receiving device and the fault line when the line is in fault in the last month and the synchronous change condition of the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device in the corresponding quality sequence and distance sequence.
Specifically, according to the quality of the electromagnetic wave signal, the quality sequence of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line fails each time in the last month is obtained, and according to the distance between the electromagnetic wave receiving device and the failed line, the distance sequence between the electromagnetic wave receiving device and the failed line when the line fails each time in the last month is obtained, specifically as follows:
Acquiring the quality of an electromagnetic wave signal received by each electromagnetic wave receiving device every time of line fault in the last month; and (3) for any line fault in the last month, arranging the quality of the electromagnetic wave signals received by all the electromagnetic wave receiving devices in the time of the line fault in the order from large to small to obtain a quality sequence of the electromagnetic wave signals received by the electromagnetic wave receiving devices in the time of the line fault.
Acquiring the distance between each electromagnetic wave receiving device and a fault line every time the line fails in the last month; it should be noted that, the distance here is the actual physical distance between the device and the faulty line; and for any line fault in the last month, arranging the distances between all electromagnetic wave receiving devices and the fault line in the order from small to large when the secondary line is in fault, and obtaining a distance sequence between the electromagnetic wave receiving devices and the fault line when the secondary line is in fault.
It should be noted that, the above-mentioned quality sequence of the electromagnetic wave signal received by the electromagnetic wave receiving device and the distance sequence between the device and the fault line obtained when any line fails, because the interference degree of the device is mainly related to the quality of the electromagnetic wave signal and the synchronous change of the distance between the device and the fault line, if the quality of the electromagnetic wave signal is larger when any line fails, it is ordered before in the quality sequence, and meanwhile the distance between the device and the fault line is smaller, and the distance between the device and the fault line is also ordered before, it is explained that the synchronous change of the quality of the electromagnetic wave signal and the distance when the line fails is more synchronous, that is, the greater the quality of the electromagnetic wave signal is, the closer the distance between the electromagnetic wave receiving device and the fault line is, the interference degree of the electromagnetic wave receiving device is smaller at this moment, and when the distance between the device and the fault line is closer, the surrounding topography of the low-voltage station area and the interference degree of the building are smaller, therefore the synchronous change condition is weighted and corrected by the distance between the device and the fault line, so that is more accurate interference degree is obtained.
Preferably, the interference degree of each electromagnetic wave receiving device is obtained according to the distance between the electromagnetic wave receiving device and the fault line when the line is in fault in the last month and the synchronous change condition of the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device in the corresponding quality sequence and distance sequence, and the specific steps are as follows:
For any electromagnetic wave receiving device in the case of any line fault in the last month, acquiring the sequence value of the quality of an electromagnetic wave signal received by the electromagnetic wave receiving device in the corresponding quality sequence in the case of the line fault, acquiring the sequence value of the distance between the electromagnetic wave receiving device and the fault line in the corresponding distance sequence in the case of the line fault, and taking the difference of the sequence value of the quality in the corresponding quality sequence and the sequence value of the distance in the corresponding distance sequence as the initial interference degree of the electromagnetic wave receiving device in the case of the line fault; taking the ratio of the distance between the electromagnetic wave receiving equipment and the fault line when the line is in fault and the sum of the distances between all the electromagnetic wave receiving equipment and the fault line as the attention weight of the electromagnetic wave receiving equipment when the line is in fault; fusing the initial interference degree and the attention weight to obtain a weighted initial interference degree; and fusing all weighted initial interference degrees of the electromagnetic wave receiving equipment when all lines fail in the last month to obtain the interference degrees of the electromagnetic wave receiving equipment, wherein the interference degrees are normalized values.
As a specific example, the specific method for obtaining the initial interference level is as follows:
Wherein M is the number of times of line faults in the last month; d m,n is the distance between the nth electromagnetic wave receiving device and the fault line when the mth line is in fault; d m is the sum of the distances between all electromagnetic wave receiving devices and the fault line when the mth line is in fault; p1 m,n is the order value of the quality of the electromagnetic wave signal received by the nth electromagnetic wave receiving device in the corresponding quality sequence when the mth line fails; p2 m,n is the sequence value of the distance between the nth electromagnetic wave receiving device and the fault line in the corresponding distance sequence when the mth line is faulty; the I is absolute value; sigmoid [ ] is a sigmoid function for normalization; w n is the interference degree of the nth electromagnetic wave receiving device.
It should be noted that, since the interference degree of the device is mainly related to the synchronous change of the quality of the electromagnetic wave signal and the distance between the device and the faulty line, when the line is faulty, the quality of the electromagnetic wave signal is larger, which is ranked forward in the quality sequence, and the distance between the device and the faulty line is smaller, which is ranked forward in the distance sequence, it is explained that the more synchronous the quality of the electromagnetic wave signal and the distance are changed when the line is faulty, that is, the larger the quality of the electromagnetic wave signal is, the closer the distance between the electromagnetic wave receiving device and the faulty line is,The smaller the electromagnetic wave receiving device is, the smaller the initial interference degree is, while the interference degree of the device is also related to the distance between the device and the faulty line, the closer the distance between the equipment and the fault line is, the less the surrounding topography of the low-voltage area and the interference of buildings are, the less the interference degree of the equipment is, and the fault line is formed byFor a pair ofAnd weighting is carried out, and finally the interference degree of the electromagnetic wave receiving equipment is obtained comprehensively, so that the influence of the excessive distance magnitude on the interference degree is reduced, and the influence is divided by D m to adjust the distance magnitude.
To this end, the interference degree of each electromagnetic wave receiving device is obtained.
Step S004, screening a plurality of key electromagnetic wave receiving devices according to the quality of electromagnetic wave signals received by the electromagnetic wave receiving devices and the interference degree of the electromagnetic wave receiving devices when the last line fails; and positioning the accurate position of the line fault according to the source direction of the electromagnetic wave signal received by the key electromagnetic wave receiving equipment in the last line fault.
It should be noted that, since the accuracy of receiving the electromagnetic wave signal by the device is mainly related to the quality of the electromagnetic wave signal received by the device and the interference degree of the electromagnetic wave receiving device, the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device and the interference degree of the electromagnetic wave receiving device are respectively analyzed, and the accuracy of receiving the electromagnetic wave signal by the electromagnetic wave receiving device can be obtained by combining the two.
Specifically, according to the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device and the interference degree of the electromagnetic wave receiving device when the last line fails, a plurality of key electromagnetic wave receiving devices are screened, and the method comprises the following steps:
Firstly, according to the quality of an electromagnetic wave signal received by an electromagnetic wave receiving device at the last line fault and the interference degree of the electromagnetic wave receiving device, the accuracy of each electromagnetic wave receiving device receiving the electromagnetic wave signal is obtained.
And secondly, screening a plurality of key electromagnetic wave receiving devices according to the accuracy.
Specifically, according to the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device and the interference degree of the electromagnetic wave receiving device when the last line fails, the accuracy of each electromagnetic wave receiving device receiving the electromagnetic wave signal is obtained, specifically as follows:
for any electromagnetic wave receiving device, acquiring the quality of an electromagnetic wave signal received by the electromagnetic wave receiving device when the line fails last time, acquiring the interference degree of the electromagnetic wave receiving device, and fusing the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line fails last time and the interference degree of the electromagnetic wave receiving device to obtain the accuracy of the electromagnetic wave receiving device for receiving the electromagnetic wave signal, wherein the accuracy is a normalized value.
As a specific example, the specific method for obtaining the accuracy is as follows:
Wherein W n is the interference degree of the nth electromagnetic wave receiving device; q ′ n is the quality of the electromagnetic wave signal received by the nth electromagnetic wave receiving device at the last line failure; beta is a preset super parameter, in order to prevent denominator from being 0, the present embodiment describes with beta=1; sigmoid () is a sigmoid function for normalization; r n is accuracy of receiving the electromagnetic wave signal by the nth electromagnetic wave receiving device.
It should be noted that, since the accuracy of the device receiving the electromagnetic wave signal is mainly related to the quality of the electromagnetic wave signal received by the device and the interference degree of the electromagnetic wave receiving device, the ratio of the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device and the interference degree of the electromagnetic wave receiving device at the time of the last line fault is taken as the accuracy of the electromagnetic wave receiving device receiving the electromagnetic wave signal, the higher the quality of the electromagnetic wave signal is, the higher the accuracy of the electromagnetic wave receiving device receiving the electromagnetic wave signal is, the lower the interference degree of the device is, and the higher the accuracy of the electromagnetic wave receiving device receiving the electromagnetic wave signal is.
It should be noted that, the accuracy of receiving the electromagnetic wave signal by each electromagnetic wave receiving device is obtained, and not all the electromagnetic wave receiving devices meet the requirement on accuracy of receiving the electromagnetic wave signal, so that the key electromagnetic wave receiving devices need to be screened through the accuracy, so that the line fault key range area can be located later.
Specifically, a plurality of key electromagnetic wave receiving devices are screened according to the accuracy, and the method specifically comprises the following steps:
A first threshold is preset, and in this embodiment, the first threshold is described as 0.32, and all electromagnetic wave receiving devices with accuracy greater than or equal to the first threshold are used as key electromagnetic wave receiving devices.
It should be noted that, the above-mentioned screening several key electromagnetic wave receiving devices, through the source direction of the electromagnetic wave signal received by the key electromagnetic wave receiving device when the last line fault, the key range area of the line fault can be located.
Specifically, according to the source direction of the electromagnetic wave signal received by the key electromagnetic wave receiving device in the last line fault, the accurate position of the line fault is located, and the method comprises the following steps:
Firstly, locating a line fault key range area according to the source direction of an electromagnetic wave signal received by key electromagnetic wave receiving equipment in the last line fault.
Secondly, the line fault key range area is checked based on a fault current measurement method, and the accurate position of the line fault is positioned.
Specifically, according to the source direction of the electromagnetic wave signal received by the key electromagnetic wave receiving device in the last line fault, the key range area of the line fault is positioned, specifically as follows:
Acquiring a straight line where the source direction of the electromagnetic wave signal received by each key electromagnetic wave receiving device in the last line fault is located, acquiring an intersection point of the straight lines where the source directions of the electromagnetic wave signals received by all key electromagnetic wave receiving devices in the last line fault are located, and taking a region corresponding to a minimum circumscribed circle containing all intersection points as a line fault key range region.
The method can be used for locating the line fault key range region, and the accurate position of the line fault can be located by checking the line fault key range region based on the fault current measurement method.
Specifically, the line fault key range area is checked based on a fault current measurement method, and the accurate position of the line fault is positioned; it should be noted that, by performing the troubleshooting on the line fault key range region based on the fault current measurement method, the accurate location of the line fault is the existing method, and the implementation is not repeated.
Through the steps, the accurate positioning method for the line faults of the low-voltage transformer area is completed.
The embodiment of the invention further provides a device for accurately positioning the line fault of the low-voltage transformer area, which comprises the following steps: an electromagnetic wave receiving device, a distance measuring device and a data processor; the electromagnetic wave receiving equipment is used for respectively acquiring an electromagnetic wave signal, the intensity of the electromagnetic wave signal, the arrival time of the electromagnetic wave signal and the source direction of the electromagnetic wave signal received by each electromagnetic wave receiving equipment when the line fails in the last month and the line fails in the last time in the low-voltage station; the distance measuring equipment is used for acquiring the distance between the electromagnetic wave receiving equipment and the fault line; the data processor is used for realizing the steps.
Another embodiment of the present invention provides a system for precisely locating a line fault in a low-voltage transformer area, the system including a memory and a processor, the processor executing a computer program stored in the memory, the processor performing the following operations:
The method comprises the steps that when a line fails in the last month or in the last time, electromagnetic wave signals received by each electromagnetic wave receiving device, the intensity of the electromagnetic wave signals, the arrival time of the electromagnetic wave signals and the source direction of the electromagnetic wave signals are obtained in a low-voltage station respectively, and the distance between the electromagnetic wave receiving device and the failed line is obtained; acquiring the quality of an electromagnetic wave signal received by each electromagnetic wave receiving device when each line fails according to the intensity and the arrival time of the electromagnetic wave signal when the line fails; obtaining the interference degree of each electromagnetic wave receiving device according to the distance between the electromagnetic wave receiving device and the fault line and the synchronous change condition of the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line is in fault in the last month; screening a plurality of key electromagnetic wave receiving devices according to the quality of an electromagnetic wave signal received by the electromagnetic wave receiving device and the interference degree of the electromagnetic wave receiving device when the last line fails; and positioning the accurate position of the line fault according to the source direction of the electromagnetic wave signal received by the key electromagnetic wave receiving equipment in the last line fault.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the invention, but any modifications, equivalent substitutions, improvements, etc. within the principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. The accurate positioning method for the line faults of the low-voltage transformer area is characterized by comprising the following steps of:
The method comprises the steps that when a line fails in the last month or in the last time, electromagnetic wave signals received by each electromagnetic wave receiving device, the intensity of the electromagnetic wave signals, the arrival time of the electromagnetic wave signals and the source direction of the electromagnetic wave signals are obtained in a low-voltage station respectively, and the distance between the electromagnetic wave receiving device and the failed line is obtained;
acquiring the quality of an electromagnetic wave signal received by each electromagnetic wave receiving device when each line fails according to the intensity and the arrival time of the electromagnetic wave signal when the line fails;
Obtaining the interference degree of each electromagnetic wave receiving device according to the distance between the electromagnetic wave receiving device and the fault line and the synchronous change condition of the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line is in fault in the last month;
Screening a plurality of key electromagnetic wave receiving devices according to the quality of an electromagnetic wave signal received by the electromagnetic wave receiving device and the interference degree of the electromagnetic wave receiving device when the last line fails; positioning the accurate position of the line fault according to the source direction of the electromagnetic wave signal received by the key electromagnetic wave receiving equipment in the last line fault;
the method for obtaining the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device when each line fault is based on the intensity and the arrival time of the electromagnetic wave signal when the line fault is caused, comprises the following specific steps:
For the first line fault of the last month, acquiring the arrival time of the electromagnetic wave signals received by all the electromagnetic wave receiving devices in the first line fault, taking the earliest arrival time as a reference arrival time, and taking the time difference between the arrival time of the electromagnetic wave signals received by each electromagnetic wave receiving device and the reference arrival time as the relative arrival time of the electromagnetic wave signals received by each electromagnetic wave receiving device in the first line fault;
Acquiring the quality of an electromagnetic wave signal received by each electromagnetic wave receiving device when each line fails according to the intensity and the relative arrival time of the electromagnetic wave signal when the line fails;
the method for obtaining the quality of the electromagnetic wave signal received by each electromagnetic wave receiving device when each line fault is based on the intensity and the relative arrival time of the electromagnetic wave signal when the line fault is caused, comprises the following specific steps:
For any electromagnetic wave receiving device in any line fault, acquiring the intensity and the relative arrival time of an electromagnetic wave signal received by the electromagnetic wave receiving device in the line fault, recording the intensity and the relative arrival time as first intensity and first relative arrival time, and fusing the first intensity and the first relative arrival time to obtain the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device in the line fault, wherein the quality is a normalized value;
The interference degree of each electromagnetic wave receiving device is obtained according to the synchronous change condition of the distance between the electromagnetic wave receiving device and the fault line and the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line is in fault in the last month, and the method comprises the following specific steps:
Acquiring a quality sequence of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line fails every month according to the quality of the electromagnetic wave signal, and acquiring a distance sequence between the electromagnetic wave receiving device and the failed line when the line fails every month according to the distance between the electromagnetic wave receiving device and the failed line;
For any electromagnetic wave receiving device in the case of any line fault in the last month, acquiring the sequence value of the quality of an electromagnetic wave signal received by the electromagnetic wave receiving device in the corresponding quality sequence in the case of the line fault, acquiring the sequence value of the distance between the electromagnetic wave receiving device and the fault line in the corresponding distance sequence in the case of the line fault, and taking the difference of the sequence value of the quality in the corresponding quality sequence and the sequence value of the distance in the corresponding distance sequence as the initial interference degree of the electromagnetic wave receiving device in the case of the line fault; taking the ratio of the distance between the electromagnetic wave receiving equipment and the fault line when the line is in fault and the sum of the distances between all the electromagnetic wave receiving equipment and the fault line as the attention weight of the electromagnetic wave receiving equipment when the line is in fault; fusing the initial interference degree and the attention weight to obtain a weighted initial interference degree; and fusing all weighted initial interference degrees of the electromagnetic wave receiving equipment when all lines fail in the last month to obtain the interference degrees of the electromagnetic wave receiving equipment, wherein the interference degrees are normalized values.
2. The method for precisely locating a line fault in a low-voltage transformer area according to claim 1, wherein the step of obtaining the quality sequence of the electromagnetic wave signal received by the electromagnetic wave receiving device every time the line fault occurs in the last month according to the quality of the electromagnetic wave signal comprises the following specific steps:
Acquiring the quality of an electromagnetic wave signal received by each electromagnetic wave receiving device every time of line fault in the last month; and (3) for any line fault in the last month, arranging the quality of the electromagnetic wave signals received by all the electromagnetic wave receiving devices in the time of the line fault in the order from large to small to obtain a quality sequence of the electromagnetic wave signals received by the electromagnetic wave receiving devices in the time of the line fault.
3. The method for precisely locating the line fault of the low-voltage transformer area according to claim 1, wherein the step of obtaining the sequence of the distance between the electromagnetic wave receiving device and the fault line every time the line fault occurs in the last month according to the distance between the electromagnetic wave receiving device and the fault line comprises the following specific steps:
Acquiring the distance between each electromagnetic wave receiving device and a fault line every time the line fails in the last month; and for any line fault in the last month, arranging the distances between all electromagnetic wave receiving devices and the fault line in the order from small to large when the secondary line is in fault, and obtaining a distance sequence between the electromagnetic wave receiving devices and the fault line when the secondary line is in fault.
4. The method for precisely locating the line fault of the low-voltage transformer area according to claim 1, wherein the step of screening a plurality of key electromagnetic wave receiving devices according to the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device and the interference degree of the electromagnetic wave receiving device at the last line fault comprises the following specific steps:
For any electromagnetic wave receiving device, acquiring the quality of an electromagnetic wave signal received by the electromagnetic wave receiving device when the line fails last time, acquiring the interference degree of the electromagnetic wave receiving device, and fusing the quality of the electromagnetic wave signal received by the electromagnetic wave receiving device when the line fails last time and the interference degree of the electromagnetic wave receiving device to acquire the accuracy of the electromagnetic wave signal received by the electromagnetic wave receiving device, wherein the accuracy is a normalized value;
A first threshold value is preset, and all electromagnetic wave receiving devices with the accuracy being greater than or equal to the first threshold value are used as key electromagnetic wave receiving devices.
5. The method for precisely locating a line fault in a low-voltage transformer area according to claim 1, wherein the locating the accurate position of the line fault according to the source direction of the electromagnetic wave signal received by the key electromagnetic wave receiving device in the last line fault comprises the following specific steps:
Acquiring a straight line where the source direction of the electromagnetic wave signal received by each key electromagnetic wave receiving device in the last line fault is located, acquiring an intersection point of the straight lines where the source directions of the electromagnetic wave signals received by all key electromagnetic wave receiving devices in the last line fault are located, and taking a region corresponding to a minimum circumscribed circle containing all intersection points as a line fault key range region;
the method is used for checking the key range area of the line fault based on the fault current measurement method, and locating the accurate position of the line fault.
6. A circuit fault accurate positioning device for a low-voltage transformer area comprises: the system comprises electromagnetic wave receiving equipment, distance measuring equipment and a data processor, and is characterized in that the electromagnetic wave receiving equipment is used for respectively acquiring an electromagnetic wave signal, the intensity of the electromagnetic wave signal, the arrival time of the electromagnetic wave signal and the source direction of the electromagnetic wave signal received by each electromagnetic wave receiving equipment when a line fails each time in the last month and when the line fails the last time in a low-voltage station; the distance measuring equipment is used for acquiring the distance between the electromagnetic wave receiving equipment and the fault line; the data processor is configured to implement a method for precisely locating a line fault in a low voltage transformer area according to any one of claims 1 to 5.
7. A low voltage bay line fault accurate positioning system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the computer program when executed by the processor implements the steps of a low voltage bay line fault accurate positioning method as claimed in any one of claims 1 to 5.
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