CN112578220B - Underground cable fault on-line positioning system and method - Google Patents
Underground cable fault on-line positioning system and method Download PDFInfo
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- CN112578220B CN112578220B CN202011349944.1A CN202011349944A CN112578220B CN 112578220 B CN112578220 B CN 112578220B CN 202011349944 A CN202011349944 A CN 202011349944A CN 112578220 B CN112578220 B CN 112578220B
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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
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
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Abstract
The invention discloses an underground cable fault online positioning system which comprises a cable unit to be detected and a detection unit, wherein the cable unit to be detected comprises an insulating pipeline, and a cable and an optical fiber are arranged in the insulating pipeline; the detection unit comprises a first detection assembly and a second detection assembly, and the first detection assembly and the second detection assembly are respectively positioned at two ends of the insulating pipeline; the invention provides an on-line fault positioning system and method laid on an underground cable, which can monitor the fault position of the underground cable in real time, can perform auxiliary judgment on the spatial position of the optical cable fault by simulating a fault event, and greatly reduce the difficulty of troubleshooting.
Description
Technical Field
The invention relates to the technical field of power line protection, in particular to an underground cable fault online positioning system and method.
Background
With the economic development and the continuous acceleration of the urbanization process of China, buried optical cables, high-voltage cables and high-voltage photoelectric composite cables are applied more and more widely in power systems; with the increase of the number of cables and the development of urban construction processes, the failure frequency of the cables caused by external force, construction, natural disasters and other reasons is obviously increased, but the underground cable line failure has the characteristics of difficult troubleshooting, difficult positioning and the like; therefore, the method can accurately and quickly judge the position of the fault, and has important practical significance for improving the power supply stability and reducing the economic loss caused by power failure.
The traditional cable fault location adopts a sound measuring method, sound signals generated by cable discharge are picked up and amplified along the position of a fault cable, and the place with the strongest signal is generally a fault point; under the actual situation, the interference of the surrounding environment to the method is large, so that the detection accuracy of the region with unstable environment is different; due to the uncertainty of the fault location, very many discharges may be required to find the cable; in addition, multiple discharges can also lead to further expansion of cable failure.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and title of the application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The invention is provided in view of the problem that the existing underground cable fault online positioning system is difficult to position and troubleshoot.
It is therefore an object of the present invention to provide an in-line location system for a fault in an underground cable.
In order to solve the technical problems, the invention provides the following technical scheme: an underground cable fault online positioning system comprises a cable unit to be detected and a detection unit, wherein the cable unit to be detected comprises an insulating pipeline, and a cable and an optical fiber are arranged in the insulating pipeline; and the detection unit comprises a first detection assembly and a second detection assembly, and the first detection assembly and the second detection assembly are respectively positioned at two ends of the insulated pipeline.
As a preferable aspect of the underground cable fault on-line positioning system of the present invention, wherein: the cable and optical fiber are in intimate contact or the optical fiber is located inside the cable.
As a preferable aspect of the underground cable fault on-line positioning system of the present invention, wherein: the first detection assembly and the second detection assembly respectively comprise a first laser light source module and a second laser light source module, and the first laser light source module and the second laser light source module are respectively located on two sides of the optical fiber.
As a preferable scheme of the underground cable fault online positioning system of the invention, wherein: the first detection assembly and the second detection assembly respectively comprise a first optical signal conditioning module and a second optical signal conditioning module, and the first optical signal conditioning module and the second optical signal conditioning module are respectively positioned on two sides of the optical fiber.
As a preferable aspect of the underground cable fault on-line positioning system of the present invention, wherein: the linearly polarized light emitted by the first laser light source module reaches the second optical signal conditioning module through the optical fiber in the opposite direction, and the linearly polarized light emitted by the second laser light source module reaches the first optical signal conditioning module through the optical fiber in the opposite direction.
As a preferable aspect of the underground cable fault on-line positioning system of the present invention, wherein: the first detection assembly and the second detection assembly respectively comprise a first optical signal detection module and a second optical signal detection module, and the first optical signal detection module and the second optical signal detection module are respectively connected with the first optical signal conditioning module and the second optical signal conditioning module through circuits.
As a preferable aspect of the underground cable fault on-line positioning system of the present invention, wherein: the first detection assembly and the second detection assembly respectively comprise a first signal acquisition module and a second signal acquisition module, and the first signal acquisition module and the second signal acquisition module are respectively connected with the first optical signal detection module and the second optical signal detection module through circuits.
As a preferable aspect of the underground cable fault on-line positioning system of the present invention, wherein: the detection unit further comprises a time synchronization unit, and the time synchronization unit is connected with the first signal acquisition module and the second signal acquisition module through circuits.
As a preferable aspect of the underground cable fault on-line positioning system of the present invention, wherein: the detection unit further comprises a signal processing unit, and the signal processing unit is connected with the first signal acquisition module and the second signal acquisition module through circuits.
The invention aims to provide an underground cable fault online positioning method.
In order to solve the technical problems, the invention provides the following technical scheme:
s1: before the cable fails, firstly, testing the length of the optical fiber by using an Optical Time Domain Reflectometer (OTDR) and the same method;
s2: after a fault occurs, analyzing whether an optical fiber break occurs or not by directly adopting an OTDR (optical time domain reflectometer) test method according to the condition that whether a fault signal is acquired or not by an underground cable fault online positioning system or after the fault occurs;
s3: for the condition that the cable fault causes the optical fiber breakage, positioning a fault point according to an OTDR fault positioning method;
s4: for the condition that the fault does not cause the breakage of the optical fiber, analyzing signals collected at two sides of the optical fiber under the same time scale, and determining the time difference between fault waveforms of two paths of cables;
s5: calculating the length of the optical fiber from the fault point to one end of the cable;
s6: estimating the approximate spatial position of a fault point, finding a measured cable, and knocking the cable to simulate the cable fault; analyzing signals collected from two sides of the optical fiber at the same time scale, determining the time difference between fault waveforms of the two paths of cables, and calculating the length of the optical fiber at a knocking point;
s7: and further estimating the approximate spatial position of the fault point according to the optical fiber length of the knocking point and the optical fiber length of the fault point, repeating the step S6 until the position of the fault point can be accurately judged, and finally finding the fault point of the optical cable.
The invention has the beneficial effects that: the invention provides an on-line fault positioning system and method laid on an underground cable, which can monitor the fault position of the underground cable in real time, can perform auxiliary judgment on the spatial position of the optical cable fault by simulating a fault event, and greatly reduce the difficulty of troubleshooting.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic overall structure diagram of the underground cable fault online positioning system.
Fig. 2 is a schematic flow chart of the underground cable fault online positioning method of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Furthermore, the present invention is described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, the cross-sectional view illustrating the structure of the device is not enlarged partially according to the general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Example 1
Referring to fig. 1, an overall structure schematic diagram of an underground cable fault online positioning system is provided, as shown in fig. 1, the underground cable fault online positioning system includes a cable unit 100 to be detected for transmitting electric energy and information, an insulating pipeline 101 for protecting the cable 102 and an optical fiber 103, a cable 102 for transmitting electric energy, an optical fiber 103 for transmitting information, a detection unit 200 for detecting a fault of the cable unit 100 to be detected, a first detection component 201 and a second detection component 202, and the cable unit 100 to be detected is detected through the detection unit 200, so that when a circuit fails, a worker can quickly find a fault point of the circuit, and thus, rush repair is quickly performed, time required by the worker to find the fault point is effectively shortened, and property loss caused by the circuit fault is greatly reduced.
Specifically, the main structure of the invention comprises a cable unit 100 to be tested for transmitting electric energy and information, and an insulating pipeline 101 for protecting a cable 102 and an optical fiber 103, wherein the cable 102 for transmitting electric energy and the optical fiber 103 for transmitting information are arranged in the insulating pipeline 101; the detection unit 200 for performing fault detection on the cable unit 100 to be detected comprises a first detection assembly 201 for performing fault detection on the cable unit 100 to be detected and a second detection assembly 202 for performing fault detection on the cable unit 100 to be detected, wherein the first detection assembly 201 and the second detection assembly 202 are respectively positioned at two ends of the insulated pipeline 101; the cable 102 and the optical fiber 103 are in intimate contact or the optical fiber 103 is located inside the cable 102.
Example 2
Referring to fig. 2, this embodiment is different from the first embodiment in that: the detection unit 200 for performing fault detection on the cable unit 100 to be detected further includes a first laser light source module 201a and a second laser light source module 202a that emit linear polarized light, a first optical signal conditioning module 201b and a second optical signal conditioning module 202b that modulate the vibration information of the optical cable 102 carried by the optical signal into optical signal strength, a first optical signal detection module 201c and a second optical signal detection module 202c that detect the optical signal modulated by the first optical signal conditioning module 201b and the second optical signal conditioning module 202b, a first signal acquisition module 201d and a second signal acquisition module 202d that acquire the signal, a time synchronization unit 203 that performs real-time synchronization on the signal acquisition, and a signal processing unit 204 that processes the acquired signal.
Further, linearly polarized light emitted by the first laser light source module 201a and the second laser light source module 202a located on both sides of the optical fiber 103 reaches the first optical signal conditioning module 201b and the second optical signal conditioning module 202b on the opposite sides through the optical fiber in opposite directions, so that optical cable vibration information carried by the optical signal is modulated to the intensity of the optical signal, and is further monitored by the first optical signal detection module 201c and the second optical signal detection module 202 c; the 2-channel signal acquisition unit carries out real-time synchronization through the time synchronization unit 203; once a cable fault and an external force impact optical cable event occur, the signal acquisition unit is triggered to acquire signals; the signal processing unit 204 processes the collected signals to complete the accurate positioning of the cable fault
Specifically, the first detection assembly 201 and the second detection assembly 202 respectively include a first laser light source module 201a and a second laser light source module 202a that emit linearly polarized light, and the first laser light source module 201a and the second laser light source module 202a are respectively located at two sides of the optical fiber 103; the first detection component 201 and the second detection component 202 respectively further include a first optical signal conditioning module 201b and a second optical signal conditioning module 202b, which enable vibration information of the optical cable 102 carried by the optical signal to be modulated into optical signal intensity, and the first optical signal conditioning module 201b and the second optical signal conditioning module 202b are respectively located on two sides of the optical fiber 103; the linearly polarized light emitted by the first laser light source module 201a reaches the second optical signal conditioning module 202b through the optical fiber in the opposite direction, and the linearly polarized light emitted by the second laser light source module 202a reaches the first optical signal conditioning module 201b through the optical fiber in the opposite direction; the first detection assembly 201 and the second detection assembly 202 respectively further include a first optical signal detection module 201c and a second optical signal detection module 202c for detecting optical signals modulated by the first optical signal conditioning module 201b and the second optical signal conditioning module 202b, and the first optical signal detection module 201c and the second optical signal detection module 202c are respectively connected with the first optical signal conditioning module 201b and the second optical signal conditioning module 202b through circuits;
further, the first detection assembly 201 and the second detection assembly 202 respectively further include a first signal acquisition module 201d and a second signal acquisition module 202d for acquiring signals, and the first signal acquisition module 201d and the second signal acquisition module 202d are respectively connected with the first optical signal detection module 201c and the second optical signal detection module 202c through circuits; the detection unit 200 further includes a time synchronization unit 203 for performing real-time synchronization on signal acquisition, and the time synchronization unit 203 is connected to the first signal acquisition module 201d and the second signal acquisition module 202d through a circuit; the detection unit 200 further includes a signal processing unit 204 for processing the acquired signal, and the signal processing unit 204 is connected to the first signal acquisition module 201d and the second signal acquisition module 202d through a circuit.
The rest of the structure is the same as in example 1.
Example 3
As shown in fig. 2, the method for online locating of a fault in an underground cable is used in the methods for online locating of faults in underground cables in embodiments 1 and 2, and specifically includes the following steps:
s1: before the cable 102 fails, the length of the optical fiber 103 is tested by OTDR;
s2: after a fault occurs, analyzing whether the optical fiber 103 is broken or not by directly adopting an OTDR (optical time domain reflectometer) test method according to the condition that whether a fault signal is acquired or not by an underground cable fault online positioning system or after the fault occurs;
s3: for the case that the fault of the cable 102 has caused the break of the optical fiber 103, positioning the fault point according to the OTDR fault positioning method;
s4: for the condition that the fault does not cause the breakage of the optical fiber 103, analyzing signals collected from two sides of the optical fiber 103 at the same time scale, and determining the time difference between fault waveforms of two paths of cables;
s5: calculating the length of the optical fiber 103 from a certain end of the cable 102 at the fault point;
s6: estimating the approximate spatial location of the fault point, finding the measured cable 102, and knocking the simulated cable 102 on the cable 102; analyzing signals collected from two sides of the optical fiber 103 at the same time scale, determining the time difference between fault waveforms of the two cables 102, and calculating the length of the optical fiber 103 at a knocking point;
s7: further estimating the approximate spatial position of the fault point according to the length of the optical fiber 103 at the knocking point and the length of the optical fiber 103 at the fault point, repeating the step S6 until the position of the fault point can be accurately determined, and finally finding the fault point of the optical cable.
Example 4
This embodiment differs from the above embodiment in that: the inventor carries out simulation experiments on the time required for troubleshooting a fault point and the economic loss caused by the time before and after the system is installed, and obtains the following data:
the data can be easily obtained, after the system is deployed, not only can fault points be quickly found, but also labor can be saved, and meanwhile, economic loss caused by circuit faults can be greatly reduced.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. An underground cable fault on-line positioning method is characterized in that: an on-line location system for underground cable faults includes,
the cable unit (100) to be tested comprises an insulating pipeline (101), wherein a cable (102) and an optical fiber (103) are arranged in the insulating pipeline (101); and (c) a second step of,
the detection unit (200) comprises a first detection assembly (201) and a second detection assembly (202), wherein the first detection assembly (201) and the second detection assembly (202) are respectively positioned at two ends of the insulating pipeline (101);
the underground cable fault on-line positioning method comprises the steps of,
s1: before the cable (102) fails, testing the length of the optical fiber (103) by OTDR;
s2: after a fault occurs, analyzing whether the optical fiber (103) is broken or not by directly adopting an OTDR test method according to the existence or nonexistence of a fault signal acquired by an underground cable fault online positioning system or after the fault occurs;
s3: for the condition that the fault of the cable (102) causes the breakage of the optical fiber (103), positioning a fault point according to an OTDR fault positioning method;
s4: for the condition that the fault does not cause the breakage of the optical fiber (103), analyzing signals collected at two sides of the optical fiber (103) at the same time scale, and determining the time difference between fault waveforms of two paths of cables;
s5: calculating the length of the optical fiber (103) from a fault point to one end of the cable (102);
s6: estimating the approximate spatial location of the fault point, finding the measured cable (102), and knocking the simulated cable (102) on the cable (102) to simulate the fault of the cable (102); analyzing signals collected from two sides of the optical fiber (103) at the same time scale, determining the time difference between fault waveforms of the two cables (102), and calculating the length of the optical fiber (103) at a knocking point;
s7: and further estimating the approximate spatial position of the fault point according to the length of the optical fiber (103) at the knocking point and the length of the optical fiber (103) at the fault point, repeating the step S6 until the position of the fault point can be accurately determined, and finally finding the fault point of the optical cable.
2. An underground cable fault on-line location method as claimed in claim 1, wherein: the cable (102) and the optical fiber (103) are in intimate contact or the optical fiber (103) is located inside the cable (102).
3. The underground cable fault on-line location method of claim 2, wherein: the first detection assembly (201) and the second detection assembly (202) respectively comprise a first laser light source module (201 a) and a second laser light source module (202 a), and the first laser light source module (201 a) and the second laser light source module (202 a) are respectively located on two sides of the optical fiber (103).
4. The underground cable fault on-line location method of claim 3, wherein: the first detection assembly (201) and the second detection assembly (202) respectively further comprise a first optical signal conditioning module (201 b) and a second optical signal conditioning module (202 b), and the first optical signal conditioning module (201 b) and the second optical signal conditioning module (202 b) are respectively located on two sides of the optical fiber (103).
5. An underground cable fault on-line location method as claimed in claim 4, wherein: the linearly polarized light emitted by the first laser light source module (201 a) reaches the second optical signal conditioning module (202 b) in the opposite direction through the optical fiber, and the linearly polarized light emitted by the second laser light source module (202 a) reaches the first optical signal conditioning module (201 b) in the opposite direction through the optical fiber.
6. An underground cable fault on-line location method as claimed in claim 5, wherein: the first detection assembly (201) and the second detection assembly (202) respectively further comprise a first optical signal detection module (201 c) and a second optical signal detection module (202 c), and the first optical signal detection module (201 c) and the second optical signal detection module (202 c) are respectively connected with the first optical signal conditioning module (201 b) and the second optical signal conditioning module (202 b) through circuits.
7. An underground cable fault on-line location method as claimed in claim 6, wherein: the first detection assembly (201) and the second detection assembly (202) respectively further comprise a first signal acquisition module (201 d) and a second signal acquisition module (202 d), and the first signal acquisition module (201 d) and the second signal acquisition module (202 d) are respectively connected with the first optical signal detection module (201 c) and the second optical signal detection module (202 c) through circuits.
8. An underground cable fault on-line location method as claimed in claim 7, wherein: the detection unit (200) further comprises a time synchronization unit (203), and the time synchronization unit (203) is connected with the first signal acquisition module (201 d) and the second signal acquisition module (202 d) through circuits.
9. An underground cable fault on-line location method as claimed in claim 8, wherein: the detection unit (200) further comprises a signal processing unit (204), and the signal processing unit (204) is connected with the first signal acquisition module (201 d) and the second signal acquisition module (202 d) through a circuit.
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