CN110703126A - Intelligent overhead transmission line capable of realizing wire breakage monitoring - Google Patents
Intelligent overhead transmission line capable of realizing wire breakage monitoring Download PDFInfo
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- CN110703126A CN110703126A CN201911011942.9A CN201911011942A CN110703126A CN 110703126 A CN110703126 A CN 110703126A CN 201911011942 A CN201911011942 A CN 201911011942A CN 110703126 A CN110703126 A CN 110703126A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/32—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks
- H01B7/328—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks comprising violation sensing means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/008—Power cables for overhead application
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Abstract
The invention discloses an intelligent overhead transmission line capable of realizing broken wire monitoring. The device comprises an aluminum-clad steel stranded wire and a broken wire monitoring sensor arranged at one position on the aluminum-clad steel stranded wire, wherein the broken wire monitoring sensor comprises an epoxy resin coating on the surface of the aluminum-clad steel stranded wire, an exciting coil, a bias magnetic field exciting coil and a coil protecting shell; the outer surface spraying epoxy coating of aluminium package steel strand wires, the outside system of having in proper order of epoxy coating has excitation coil and bias magnetic field excitation coil, is covered by the coil protective housing outside the aluminium package steel strand wires near on every side, and excitation coil and bias magnetic field excitation coil's output are worn out and are connected to same sensor cable interface behind the coil protective housing. The invention can realize the excitation and the receiving of the guided wave signals in the tested structure, has high electro-acoustic coupling efficiency, greatly improves the energy conversion efficiency and increases the detection range of the ultrasonic guided wave.
Description
Technical Field
The invention relates to an overhead transmission line, in particular to an overhead transmission line capable of realizing a broken wire monitoring function, which can be used for outdoor overhead high-voltage transmission lines and the like.
Background
The transmission line is the material foundation for the development of the power industry, the transmission grid facilities are burdened with the tasks of transmitting and distributing electric energy, and the reliability and the operating condition of the equipment directly determine the stability and the safety of the whole system and also determine the power supply quality and the reliability of power supply. The transmission of electricity is an important component link of the overall function of the power system, and the system has the characteristics of small electric energy loss, high economic benefit, convenience, flexibility, easiness in regulation and control, less environmental pollution and the like, and has the characteristics of wide coverage range, long line, harsh operating environment and the like. Transmission lines exposed to the atmosphere are easily affected by weather and environment (such as ice and snow, strong wind, lightning, dirt, and the like) to cause faults. Therefore, the power transmission line is difficult to patrol, the maintenance workload is large, and the problems existing in the power transmission line can not be found and solved in time, so that the production and the life of the country and residents can be influenced. Ensuring the safety and smoothness of the power 'lifeline' has become an unbounded social problem.
However, with the rapid development of power construction, power grid construction and equipment maintenance work under the condition of complicated terrain is more and more. The operation safety of the existing transmission line and the service life of the line are concerned by the vast electric power workers. The rapidly-increased power transmission lines bring more and more inspection and maintenance work to line operators, and are essential for monitoring line dangerous points such as crossing and intensive personnel activities. In addition, the local meteorological station cannot accurately monitor the microclimate environment of a specific power transmission line corridor, and only monitors and records the environment of a certain area at fixed time and fixed point, so that the power transmission line is difficult to judge faults in time, prevent in advance and research and analyze. The economy of China continues to grow rapidly, the power consumption increases rapidly, and the power supply and utilization situation becomes severe day by day. The problems of lags in power grid planning and construction and insufficient transmission capacity are increasingly prominent, the discordance of power grid and power supply development is aggravated, a series of problems are brought, and the problems are particularly prominent in some economically developed areas. Aiming at the limitation that some transmission lines are limited by the limit of thermal stability of transmission capacity, the transmission capacity of the transmission lines in the system is severely limited, and the power supply capacity of a power grid is greatly influenced. With the continuous expansion of the scale of the power grid, the problems are increasingly prominent and cannot be effectively solved only by manual means. In the current continuously-propelled transmission line state maintenance work, the line state evaluation is used as the premise and the basis for implementing state maintenance, and the accuracy and the timeliness of the evaluation directly influence the correct formulation and implementation of a line maintenance strategy and a maintenance period. In addition, the line state evaluation and diagnosis still stay in a discrete monitoring and analysis mode, the automation and informatization degree is not high, and the monitoring and early warning capabilities of the hidden danger are not strong. The development of a continuous or timed online monitoring technology applied to the operation and maintenance of the power transmission line, the establishment of a centralized monitoring and control center, the establishment of a 24-hour special duty system and the like is required, and the modern monitoring means and a management mechanism are effectively linked, so that a new step is formed in the safe and stable operation of the power grid. At present, the planning design of the intelligent power grid in China is provided, and based on a strong power grid with an extra-high voltage power grid as a backbone network frame and coordinated development of power grids at all levels, a unified strong intelligent power grid with the characteristics of informatization, automation, digitization and interaction is constructed by utilizing advanced communication, information and control technologies. And high tension transmission line guarantees its safe and stable operation as connecting the tie between power plant, transformer substation and the power consumption customer, will be undoubtedly to the important function that plays of strong smart power grids of construction.
At present, a plurality of technologies and devices for online detection and real-time monitoring of overhead transmission lines exist at home and abroad, but most of the devices only monitor one or two parameters, have single functions and are difficult to realize real all-weather 24-hour monitoring work; particularly, until now, no reliable nondestructive detection technical means for detecting the damage and strand breakage of the overhead transmission line conductor exists, and the safe operation of the transmission line is guaranteed. Therefore, the comprehensive online monitoring technology research of the current, the temperature, the waving, the ice coating and the strand breaking of the overhead transmission line is developed, the development direction of the intelligent power grid is met, and the comprehensive online monitoring technology research has important significance for guaranteeing the safety of the transmission line and reducing the work amount of line patrol maintenance.
At present, various disclosed technologies for monitoring the broken wires of the overhead transmission line do not have a perfect intelligent scheme capable of comprehensively monitoring the structural health condition.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to overcome the defects in the background art field and provide the intelligent overhead transmission line capable of realizing the monitoring of the structural health (broken wire) state, and the size and the position of the damage of the transmission line are monitored in real time.
The invention is realized by the following technical scheme:
the device comprises an aluminum-clad steel strand and a broken wire monitoring sensor arranged at least one position on the aluminum-clad steel strand, wherein the broken wire monitoring sensor comprises an epoxy resin coating on the surface of the aluminum-clad steel strand, an exciting coil, a bias magnetic field exciting coil and a coil protective shell; the outer surface spraying epoxy coating of aluminium package steel strand wires, the outside system excitation coil and the magnetic excitation coil of bias magnetic field of having in proper order of winding of epoxy coating, the same and both ends of the axial length of aluminium package steel strand wires are followed to excitation coil and magnetic excitation coil of bias magnetic field, epoxy coating, outside the excitation coil and the magnetic excitation coil of bias magnetic field and around the aluminium package steel strand wires around it outside by the cladding of coil protective housing, the output of excitation coil and magnetic excitation coil of bias magnetic field is worn out and is connected to same sensor cable interface behind the coil protective housing.
The excitation coil and the bias magnetic field excitation coil are realized by winding enameled wires or connecting a multi-core flat cable with a connector, and the turn ratio of the bias magnetic field excitation coil to the excitation coil is more than 1.
The epoxy resin coating is a resin material which is doped with Fe-Ga alloy powder with the particle size of about 1000 meshes and has the magnetostrictive effect.
An excitation coil and a bias magnetic field excitation coil in the broken wire monitoring sensor are in a structure of spirally winding or winding displacement welding multi-pin connectors.
The coil protection shell mainly comprises two semicircular barrel-shaped structures, the excitation coil and the bias magnetic field excitation coil are surrounded by the two semicircular barrel-shaped structures after the two semicircular barrel-shaped structures are buckled, a cable socket is installed on a sensor cable interface on the upper surface after the two semicircular barrel-shaped structures are buckled, an end cover is arranged on the sensor cable interface, and outgoing lines of the excitation coil and the bias magnetic field excitation coil are connected with corresponding pins of the socket of the cable socket.
And the excitation coil, the bias magnetic field excitation coil and the coil protection shell in the broken wire monitoring sensor are all made of high-temperature-resistant materials.
The power transmission line of the aluminum-clad steel strand is formed by twisting steel strands and aluminum strands together, wherein the number of the aluminum strands is 2-3, the twisting directions of adjacent layers are opposite, and the steel core is formed by combining 7 steel strands.
The intelligent overhead transmission line utilizes equipment installed on the line to carry out centralized monitoring on the surrounding environment parameters and the running state of the line, and after the collected running state data is analyzed and comprehensively judged, the safety early warning of the transmission line is realized, and the state maintenance can be realized.
The invention can be widely used for overhead transmission lines, high-voltage transmission lines and the like.
The invention has the beneficial effects that:
based on the magnetostrictive effect, the excitation magnetic field and the bias magnetic field act on the outer coating of the power transmission line with high magnetostrictive coefficient, so that magnetostrictive displacement is transmitted to the power transmission line, thereby forming guided wave in the power transmission line to propagate along the power transmission line, and overcoming the problems of low transduction efficiency and large attenuation of the guided wave excited by the magnetostrictive effect of the power transmission line.
If the invention can be effectively implemented, the magnetostrictive guided wave sensor is preset when the power transmission line leaves a factory, the structural health condition of the power transmission line can be monitored in real time in the whole life cycle of the power transmission line, accidents are prevented, and greater economic benefits are created.
Drawings
FIG. 1 is an overall schematic view of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1 of the present invention;
FIG. 3 is a schematic representation of a coating of the present invention;
FIG. 4 is a schematic view of the excitation coil, bias field excitation coil and coil containment vessel assembly of the present invention;
FIG. 5 is a schematic view of a magnetostrictive sensor of the invention;
FIG. 6 is a schematic diagram of an embodiment of the present invention;
FIG. 7 is a schematic illustration of the effect of magnetostrictive powder spray;
FIG. 8 is a graph of the result of a guided wave detection signal of an aluminum conductor steel reinforced according to an embodiment.
In the figure: 1. the device comprises an end face, 2 a broken wire monitoring sensor, 3 an aluminum-clad steel strand, 4 an epoxy resin coating, 5 an excitation coil, 6 a bias magnetic field excitation coil, 7 a coil protective shell, 8 a sensor cable interface, 9 a coating thickness of the epoxy resin coating, 10 a distance d between the epoxy resin coating and the end face, 11 and a width of the epoxy resin coating.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the concrete implementation comprises an aluminum-clad steel strand 3 and a broken wire monitoring sensor 2 arranged at least one position on the aluminum-clad steel strand 3, wherein the aluminum-clad steel strand 3 is used as a power transmission line,
as shown in fig. 2-4, the broken wire monitoring sensor 2 includes an epoxy resin coating 4 on the surface of the aluminum-clad steel strand 3, an excitation coil 5, a bias magnetic field excitation coil 6, and a coil protection shell 7; the outer surface spraying epoxy coating 4 of aluminium package steel strand 3, the outer surface spraying epoxy coating 4 of the aluminium package steel strand 3 of certain length range in certain distance department, the length of epoxy coating 4 is L, and thickness is w 0.2 ~ 0.25 mm. An excitation coil 5 and a bias magnetic field excitation coil 6 are sequentially wound on the epoxy resin coating 4 outwards, the epoxy resin coating 4, the excitation coil 5 and the bias magnetic field excitation coil 6 are the same in axial length along the aluminum-clad steel stranded wire 3, two ends of the epoxy resin coating 4, two ends of the excitation coil 5 and two ends of the bias magnetic field excitation coil 6 are aligned, the epoxy resin coating 4, the excitation coil 5 and the bias magnetic field excitation coil 6 are outside and outside the aluminum-clad steel stranded wire 3 around the excitation coil 5 and the bias magnetic field excitation coil 6 are coated by a coil protective shell 7, output ends of the excitation coil 5 and the bias magnetic field excitation coil 6 penetrate through the coil protective shell 7 and then are connected to the same sensor cable interface 8, as shown in fig. 5, the.
The epoxy resin coating 4 is a resin material with magnetostrictive effect, which is doped with Fe-Ga alloy powder with the particle size of about 1000 meshes, and the resin material has high magnetostrictive coefficient after being cured, and can generate larger vibration displacement after being externally added with a magnetic field and transmit the vibration displacement to the power transmission line of the aluminum-clad steel strand 3 to form guided waves and transmit the guided waves along the power transmission line.
In specific implementation, the excitation coil, the bias magnetic field excitation coil and the coil protection shell in the broken wire monitoring sensor 2 are installed at certain positions on the surface of the power transmission line, then the sensor coil protection shell 8 is installed, and a cable interface 9 on the coil protection shell is exposed. The coil protection shell 7 mainly comprises two semicircular barrel-shaped structures, the excitation coil 5 and the bias magnetic field excitation coil 6 are surrounded by the two semicircular barrel-shaped structures after the two semicircular barrel-shaped structures are buckled, a cable socket and an end cover are arranged on a sensor cable interface 8 on the upper surface after the buckling, and outgoing lines of the excitation coil 5 and the bias magnetic field excitation coil 6 are connected with corresponding pins of the socket of the cable socket.
The exciting coil 5 and the bias magnetic field exciting coil 6 are realized by enameled wire winding or multi-core flat cable connection with a connector, the turn ratio of the bias magnetic field exciting coil and the exciting coil is more than 1, and the exciting coil 5 and the bias magnetic field exciting coil 6 are in a structure of spirally winding or winding-line welding multi-pin connector. And the excitation coil 5, the bias magnetic field excitation coil 6 and the coil protection shell 7 in the broken wire monitoring sensor are all made of high-temperature-resistant materials.
The aluminum-clad steel strand 3 is formed by co-stranding steel strands and aluminum strands, wherein the aluminum strands are 2-3 layers in total, the stranding directions of adjacent layers are opposite, and the steel core is formed by synthesizing 7 steel strands.
The invention evenly sprays the epoxy resin doped with alloy powder on the surface of the aluminum-clad steel strand, a magnetic field formed by an exciting coil and a bias magnetic field exciting coil generates a magnetostriction positive effect in an epoxy resin coating, ultrasonic guided waves are generated by excitation, the reflected waves are reflected when being damaged when being transmitted in a tested line, and the reflected waves are converted into electric signals in an energy conversion winding coil through the magnetostriction reverse effect, so that the guided wave signal excitation and receiving in a tested structure are realized.
The epoxy resin coating 4 adopts magnetostrictive alloy powder, has a magnetostrictive coefficient much larger than that of common steel, and the powder coating type transducer is tightly attached to a detection object, so that the electro-acoustic coupling efficiency is high, the energy conversion efficiency is greatly improved, and the detection range of ultrasonic guided waves is enlarged.
The aluminum-clad steel strand is formed by twisting an inner core steel strand and a peripheral aluminum strand together, the magnetostriction coefficient is low, and the initial vibration displacement of the excited guided wave is limited, so that enough guided wave energy can be transmitted to a far end only by exciting the guided wave vibration displacement with larger initial amplitude when a long-length power transmission line is detected. The magnetostrictive effect is generated on the magnetostrictive material of the epoxy resin coating 4 to excite the vibration displacement and then transmit the vibration displacement to the power transmission line to form guided waves, and the energy of the guided waves can still be transmitted far after attenuation, so that the detection range of the guided waves can be greatly increased.
The coil protection shell is made of high-temperature-resistant non-metal materials, and the inner contour of the coil protection shell is the same as the outer contour of the shaped steel wire bundle and is cylindrical.
As shown in fig. 6, the specific implementation process of the present invention is as follows:
and uniformly spraying an epoxy resin coating at a distance d from the lower end face of the power transmission line, wherein the width of the coating is L, and the thickness of the coating is w. The exciting coil 5, the bias magnetic field exciting coil 6 and the coil protective shell 7 are arranged at the coating position of the power transmission line, the coil protective shell 7 is of a two-semicircular tubular structure, and the guided wave exciting coil and the bias magnetic field exciting coil can be wrapped inside the coil protective shell after buckling to play roles in positioning and protecting.
And after the coil protection shell is installed, leading-out wires of the guided wave excitation coil and the bias magnetic field excitation coil are welded with socket pins on the coil protection shell.
Connecting the power transmission line guided wave monitor and the cable socket to carry out sensor test, and after the sensor test is passed, cleaning, trimming and sealing the connection part of the coil protective shell and the power transmission line, as shown in figure 7.
The spraying is carried out according to the specific process, the SMPC coating is sprayed on the left end of the power transmission line, and the coating is not sprayed on the right end of the power transmission line, so that the power transmission line is used as a control group. The guided waves are excited at two ends of the workpiece respectively, the excitation and the reception of the guided waves adopt a pulse echo mode, namely, a magnetostrictive guided wave transducer is simultaneously used as an excitation transducer and a receiving transducer, and the central excitation frequency is 50kHz and 100 kHz. The signal generator generates 5 periods of sine waves modulated by a Hanning window, an excitation signal passes through a RAM-5000 power amplifier of Ritec company and then is connected into an excitation coil, the excitation coil adopts an axial array coil, and a bias magnet is provided by a permanent magnet bias magnetizer. The guided wave echo signal passes through a filter and a voltage amplifier and then is connected into an oscilloscope for display, and simultaneously, the voltage signal is stored in a computer after being subjected to A/D conversion.
The guided wave signals collected under the two groups of excitation frequencies are shown in fig. 8, wherein the blue line in the graph represents the left end face signal sprayed with the SMPC coating, and the red line represents the right end face signal without the SMPC coating. As can be seen from the figure, two groups of obvious wave packets can be seen in the signals received by the left end face transducer, namely the first reflected echo and the second reflected echo of the end face respectively; however, the guided wave reception signal on the right end surface is almost noise, and a reflection echo is featureless.
The above experiments show the feasibility and effectiveness of the SMPC coating transducer for transmission line guided wave transduction.
The above-described embodiments are merely illustrative of the present invention, and the specific embodiments of the present invention include but are not limited to the above-mentioned embodiments, and any modifications of the present invention within the scope of the claims of the present invention are within the scope of the present invention.
Claims (7)
1. The utility model provides a can realize intelligent overhead transmission line of disconnected silk monitoring which characterized in that: the device comprises an aluminum-clad steel strand (3) and a broken wire monitoring sensor (2) arranged at one position on the aluminum-clad steel strand (3), wherein the broken wire monitoring sensor (2) comprises an epoxy resin coating (4) on the surface of the aluminum-clad steel strand (3), an exciting coil (5), a bias magnetic field exciting coil (6) and a coil protective shell (7); the sensor comprises an aluminum-clad steel strand (3), wherein an epoxy resin coating (4) is sprayed on the outer surface of the aluminum-clad steel strand (3), the epoxy resin coating (4) is sprayed on the outer surface of the aluminum-clad steel strand (3), an excitation coil (5) and a bias magnetic field excitation coil (6) are sequentially wound outwards on the epoxy resin coating (4), the excitation coil (5) and the bias magnetic field excitation coil (6) are the same in axial length along the aluminum-clad steel strand (3) and aligned at two ends, the epoxy resin coating (4), the excitation coil (5) and the bias magnetic field excitation coil (6) and the aluminum-clad steel strand (3) near the periphery are coated by a coil protective shell (7), and the output ends of the excitation coil (5) and the bias magnetic field excitation coil (6) penetrate out of the coil protective shell (7) and then are connected to.
2. The intelligent overhead transmission line capable of realizing wire breakage monitoring according to claim 1, characterized in that: the excitation coil (5) and the bias magnetic field excitation coil (6) are realized by enameled wire winding or connection of a multi-core flat cable and a connector, and the turn ratio of the bias magnetic field excitation coil to the excitation coil is more than 1.
3. The intelligent overhead transmission line capable of realizing wire breakage monitoring according to claim 1, characterized in that: the epoxy resin coating (4) is a resin material which is doped with Fe-Ga alloy powder with the grain size of about 1000 meshes and has magnetostrictive effect.
4. The intelligent overhead transmission line capable of realizing wire breakage monitoring according to claim 1, characterized in that: an excitation coil (5) and a bias magnetic field excitation coil (6) in the broken wire monitoring sensor (2) are in a structure of spirally winding or arranging wire welding multi-pin connectors.
5. The intelligent overhead transmission line capable of realizing wire breakage monitoring according to claim 1, characterized in that: the coil protection shell (7) mainly comprises two semicircular barrel-shaped structures, the excitation coil (5) and the bias magnetic field excitation coil (6) are surrounded by the two semicircular barrel-shaped structures after being buckled, a cable socket is installed on a sensor cable interface (8) on the upper side after being buckled, an end cover is arranged on the sensor cable interface, and outgoing lines of the excitation coil (5) and the bias magnetic field excitation coil (6) are connected with corresponding pins of the socket of the cable socket.
6. The intelligent overhead transmission line capable of realizing wire breakage monitoring according to claim 1, characterized in that: and the excitation coil (5), the bias magnetic field excitation coil (6) and the coil protection shell (7) in the broken wire monitoring sensor are all made of high-temperature-resistant materials.
7. The intelligent overhead transmission line capable of realizing wire breakage monitoring according to claim 1, characterized in that: the power transmission line of the aluminum-clad steel strand (3) is formed by jointly twisting steel strands and aluminum strands, wherein the aluminum strands have 2-3 layers, the twisting directions of adjacent layers are opposite, and the steel core is formed by combining 7 steel strands.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911011942.9A CN110703126A (en) | 2019-10-23 | 2019-10-23 | Intelligent overhead transmission line capable of realizing wire breakage monitoring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911011942.9A CN110703126A (en) | 2019-10-23 | 2019-10-23 | Intelligent overhead transmission line capable of realizing wire breakage monitoring |
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| CN110703126A true CN110703126A (en) | 2020-01-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113566688A (en) * | 2021-07-14 | 2021-10-29 | 国家石油天然气管网集团有限公司华南分公司 | Magnetostrictive waveguide wire capable of improving energy conversion efficiency and preparation method thereof |
-
2019
- 2019-10-23 CN CN201911011942.9A patent/CN110703126A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113566688A (en) * | 2021-07-14 | 2021-10-29 | 国家石油天然气管网集团有限公司华南分公司 | Magnetostrictive waveguide wire capable of improving energy conversion efficiency and preparation method thereof |
| CN113566688B (en) * | 2021-07-14 | 2023-03-14 | 国家石油天然气管网集团有限公司华南分公司 | Magnetostrictive waveguide wire capable of improving energy conversion efficiency and preparation method thereof |
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