CN117388636A - Power transmission line fault positioning method, equipment and storage medium - Google Patents
Power transmission line fault positioning method, equipment and storage medium Download PDFInfo
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- CN117388636A CN117388636A CN202311435118.2A CN202311435118A CN117388636A CN 117388636 A CN117388636 A CN 117388636A CN 202311435118 A CN202311435118 A CN 202311435118A CN 117388636 A CN117388636 A CN 117388636A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 36
- 238000001228 spectrum Methods 0.000 claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 238000004422 calculation algorithm Methods 0.000 claims abstract description 12
- 230000007547 defect Effects 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000001028 reflection method Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 230000004807 localization Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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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
- G01R31/088—Aspects of digital computing
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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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- 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
Abstract
The application provides a power transmission line fault positioning method, equipment and a storage medium, which are used for solving the technical problem that the existing cable fault positioning method is poor in accuracy in long cable positioning. Injecting an incident signal into a fault cable to be tested based on a built test platform, and obtaining a reflected signal of the fault cable to be tested; obtaining a head-end reflection coefficient spectrum of the to-be-tested fault cable based on the incident signal and the reflection signal; transmitting the head-end reflection coefficient spectrum to a computer device; and analyzing the head-end reflection coefficient spectrum based on a CEEMD algorithm, and calculating the defect position of the cable to be tested. According to the method and the device, the real part of the reflection coefficient of the cable to be tested is decomposed through the CEEMD algorithm, and the first-stage impedance mismatch and the reflection coefficient of the cable fault are obtained, so that the fault positioning accuracy is improved. Meanwhile, the method and the device are further based on a nutall window and a blackbman window to optimize a positioning curve, so that fault positioning is further accurate.
Description
Technical Field
The application relates to the technical field of cable fault positioning, in particular to a power transmission line fault positioning method, equipment and a storage medium.
Background
The cable erected on the transmission line is long in age, faults frequently occur in recent years, and the manual investigation mode is time-consuming and labor-consuming and has low efficiency. How to quickly locate the faults of the power transmission line is a major concern in the current power transmission and transformation field.
Currently, fault localization for cables is mainly: the time domain reflection method and the time domain reflection method are widely applied due to the simple principle and convenient calculation. However, the Gaussian pulse signals injected by the two methods have fewer high frequencies, and the sensitivity of fault identification is lower. Therefore, larger errors are generated on the accuracy of fault positioning results, particularly in the practical application of fault positioning of long cables, good results are difficult to obtain, and fault defects of the long cables cannot be identified.
Disclosure of Invention
The application provides a power transmission line fault positioning method, equipment and a storage medium, which are used for solving the technical problem that the existing cable fault positioning method is poor in accuracy in long cable positioning.
In one aspect, the present application provides a method for locating a fault of a power transmission line, the method including the following steps:
step S1: injecting an incident signal into a fault cable to be tested based on a built test platform, and obtaining a reflected signal of the fault cable to be tested;
step S2: obtaining a head-end reflection coefficient spectrum of the to-be-tested fault cable based on the incident signal and the reflection signal;
step S3: transmitting the head-end reflection coefficient spectrum to a computer device;
step S4: and analyzing the head-end reflection coefficient spectrum based on a CEEMD algorithm, and calculating the defect position of the cable to be tested.
In one implementation manner of the present application, in the step S1, the built test platform is specifically: the system comprises a cable to be tested, a test line, a vector network analyzer and computer equipment; the test line is connected with the head end of the cable to be tested and the input end of the vector network analyzer, and the output end of the vector network analyzer is connected with the computer equipment.
In one implementation of the present application, the real part of the reflection coefficient is calculated based on the following formula:
wherein alpha is the cable attenuation constant, x is the distance between the point to be tested and the head end of the fault cable to be tested, f is the test frequency, v is the propagation speed of the incident signal in the cable, ρ x Is the reflection coefficient at the ground fault.
In one implementation of the present application, before the step S4, the method further includes:
acquiring a first amplitude curve of the cable to be tested based on the reflection coefficient spectrum;
determining that the reflection peak of the first amplitude curve exceeds a preset threshold;
extracting the reflection coefficient of the cable to be detected by using the CEEMD algorithm;
and processing the reflection coefficient based on a nutall window and a blackman window, and reconstructing the first amplitude curve to obtain a second amplitude curve.
In one implementation of the present application, the test frequency is 0.15 to 200MHz.
In one implementation of the present application, the method further includes: and determining an amplitude peak point in the second amplitude curve, and determining a distance value corresponding to the amplitude peak point, wherein the distance value is the defect position of the cable to be tested.
Secondly, the embodiment of the application also provides a transmission line fault positioning device, which comprises:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a transmission line fault location method as described above.
Finally, the embodiment of the application also provides a nonvolatile computer storage medium for positioning the fault of the power transmission line, which stores computer executable instructions, wherein the computer executable instructions are used for executing the fault positioning method of the power transmission line.
According to the power transmission line fault positioning method, equipment and storage medium, the real part of the reflection coefficient of the cable to be tested is decomposed through the CEEMD algorithm, and the first-stage impedance mismatch and the reflection coefficient of the cable fault are obtained, so that the fault positioning accuracy is improved. Meanwhile, the method and the device are further based on a nutall window and a blackbman window to optimize a positioning curve, so that fault positioning is further accurate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a flowchart of a method for positioning a fault of a power transmission line according to an embodiment of the present application;
fig. 2 is a diagram of a fault location amplitude of a power transmission line according to an embodiment of the present application;
fig. 3 is a schematic diagram of a fault location device for a power transmission line according to an embodiment of the present application.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The cable erected on the transmission line is long in age, faults frequently occur in recent years, and the manual investigation mode is time-consuming and labor-consuming and has low efficiency. How to quickly locate the faults of the power transmission line is a major concern in the current power transmission and transformation field.
Currently, fault localization for cables is mainly: the time domain reflection method and the time domain reflection method are widely applied due to the simple principle and convenient calculation. However, the Gaussian pulse signals injected by the two methods have fewer high frequencies, and the sensitivity of fault identification is lower. Therefore, larger errors are generated on the accuracy of fault positioning results, particularly in the practical application of fault positioning of long cables, good results are difficult to obtain, and fault defects of the long cables cannot be identified.
The embodiment of the application provides a method, equipment and a storage medium for positioning faults of a power transmission line, and the technical scheme provided by the embodiment of the application is described in detail through drawings.
Fig. 1 is a flowchart of a method for positioning a fault of a power transmission line according to an embodiment of the present application. As shown in fig. 1, the method mainly comprises the following steps:
step S1: injecting an incident signal into a fault cable to be tested based on a built test platform, and obtaining a reflected signal of the fault cable to be tested;
step S2: obtaining a head-end reflection coefficient spectrum of the to-be-tested fault cable based on the incident signal and the reflection signal;
step S3: transmitting the head-end reflection coefficient spectrum to a computer device;
step S4: and analyzing the head-end reflection coefficient spectrum based on a CEEMD algorithm, and calculating the defect position of the cable to be tested.
In the embodiment of the present application, in step S1, the built test platform is specifically: the system comprises a cable to be tested, a test line, a vector network analyzer and computer equipment; the test line is connected with the head end of the cable to be tested and the input end of the vector network analyzer, and the output end of the vector network analyzer is connected with the computer equipment.
In one implementation of the present application, the real part of the reflection coefficient is calculated based on the following formula:
wherein alpha is the cable attenuation constant, x is the distance between the point to be tested and the head end of the fault cable to be tested, f is the test frequency, v is the propagation speed of the incident signal in the cable, ρ x Is the reflection coefficient at the ground fault.
In an embodiment of the present application, before the step S4, the method further includes:
acquiring a first amplitude curve of the cable to be tested based on the reflection coefficient spectrum;
determining that the reflection peak of the first amplitude curve exceeds a preset threshold;
extracting the reflection coefficient of the cable to be detected by using the CEEMD algorithm;
and processing the reflection coefficient based on a nutall window and a blackman window, reconstructing the first amplitude curve to obtain a second amplitude curve as shown in fig. 2, and reading out that a peak value appears at 152 meters from the amplitude curve, so that the fault point is 152 meters away from the head end of the cable.
In the embodiment of the application, the test frequency is 0.15-200 MHz.
In an embodiment of the present application, the method further includes: and determining an amplitude peak point in the second amplitude curve, and determining a distance value corresponding to the amplitude peak point, wherein the distance value is the defect position of the cable to be tested.
The foregoing is a power transmission line fault locating method provided by the embodiment of the present application, and based on the same inventive concept, the embodiment of the present application further provides a power transmission line fault locating device, and fig. 3 is a schematic diagram of a power transmission line fault locating device provided by the embodiment of the present application, where, as shown in fig. 3, the device mainly includes: at least one processor 301; and a memory 302 communicatively coupled to the at least one processor; wherein the memory 302 stores instructions executable by the at least one processor 301, the instructions being executable by the at least one processor 301 to enable the at least one processor 301 to: injecting an incident signal into a fault cable to be tested based on a built test platform, and obtaining a reflected signal of the fault cable to be tested; obtaining a head-end reflection coefficient spectrum of the to-be-tested fault cable based on the incident signal and the reflection signal; transmitting the head-end reflection coefficient spectrum to a computer device; and analyzing the head-end reflection coefficient spectrum based on a CEEMD algorithm, and calculating the defect position of the cable to be tested.
In addition, the embodiment of the application further provides a non-volatile computer storage medium for positioning the fault of the power transmission line, which stores computer executable instructions, wherein the computer executable instructions are configured to: injecting an incident signal into a fault cable to be tested based on a built test platform, and obtaining a reflected signal of the fault cable to be tested; obtaining a head-end reflection coefficient spectrum of the to-be-tested fault cable based on the incident signal and the reflection signal; transmitting the head-end reflection coefficient spectrum to a computer device; and analyzing the head-end reflection coefficient spectrum based on a CEEMD algorithm, and calculating the defect position of the cable to be tested.
According to the power transmission line fault positioning method, equipment and storage medium, the real part of the reflection coefficient of the cable to be tested is decomposed through the CEEMD algorithm, and the first-stage impedance mismatch and the reflection coefficient of the cable fault are obtained, so that the fault positioning accuracy is improved. Meanwhile, the method and the device are further based on a nutall window and a blackbman window to optimize a positioning curve, so that fault positioning is further accurate.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
All embodiments in the application are described in a progressive manner, and identical and similar parts of all embodiments are mutually referred, so that each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments in part.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (8)
1. A method for locating a transmission line fault, the method comprising the steps of:
step S1: injecting an incident signal into a fault cable to be tested based on a built test platform, and obtaining a reflected signal of the fault cable to be tested;
step S2: obtaining a head-end reflection coefficient spectrum of the to-be-tested fault cable based on the incident signal and the reflection signal;
step S3: transmitting the head-end reflection coefficient spectrum to a computer device;
step S4: and analyzing the head-end reflection coefficient spectrum based on a CEEMD algorithm, and calculating the defect position of the cable to be tested.
2. The power transmission line fault locating method according to claim 1, wherein in the step S1, the built test platform is specifically: the system comprises a cable to be tested, a test line, a vector network analyzer and computer equipment; the test line is connected with the head end of the cable to be tested and the input end of the vector network analyzer, and the output end of the vector network analyzer is connected with the computer equipment.
3. The transmission line fault location method according to claim 1, wherein the real part of the reflection coefficient is calculated based on the following formula:
wherein alpha is the cable attenuation constant, x is the distance between the point to be tested and the head end of the fault cable to be tested, f is the test frequency, v is the propagation speed of the incident signal in the cable, ρ x Is the reflection coefficient at the ground fault.
4. The method according to claim 1, characterized in that before said step S4, said method further comprises:
acquiring a first amplitude curve of the cable to be tested based on the reflection coefficient spectrum;
determining that the reflection peak of the first amplitude curve exceeds a preset threshold;
extracting the reflection coefficient of the cable to be detected by using the CEEMD algorithm;
and processing the reflection coefficient based on a nutall window and a blackman window, and reconstructing the first amplitude curve to obtain a second amplitude curve.
5. A transmission line fault location method according to claim 3, wherein the test frequency is 0.15-200 MHz.
6. The transmission line fault location method of claim 4, further comprising: and determining an amplitude peak point in the second amplitude curve, and determining a distance value corresponding to the amplitude peak point, wherein the distance value is the defect position of the cable to be tested.
7. A transmission line fault locating device, the device comprising:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a transmission line fault location method as claimed in any one of claims 1 to 6.
8. A non-volatile computer storage medium storing computer executable instructions for transmission line fault location, characterized in that the computer executable instructions are arranged for performing a transmission line fault location method according to any of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311435118.2A CN117388636A (en) | 2023-10-31 | 2023-10-31 | Power transmission line fault positioning method, equipment and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311435118.2A CN117388636A (en) | 2023-10-31 | 2023-10-31 | Power transmission line fault positioning method, equipment and storage medium |
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| CN117388636A true CN117388636A (en) | 2024-01-12 |
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| CN202311435118.2A Pending CN117388636A (en) | 2023-10-31 | 2023-10-31 | Power transmission line fault positioning method, equipment and storage medium |
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| CN (1) | CN117388636A (en) |
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- 2023-10-31 CN CN202311435118.2A patent/CN117388636A/en active Pending
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