CN112461145A - Deformation monitoring system of pull rod type corrugated pipe - Google Patents
Deformation monitoring system of pull rod type corrugated pipe Download PDFInfo
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- CN112461145A CN112461145A CN202010948884.9A CN202010948884A CN112461145A CN 112461145 A CN112461145 A CN 112461145A CN 202010948884 A CN202010948884 A CN 202010948884A CN 112461145 A CN112461145 A CN 112461145A
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- sensor
- corrugated pipe
- pull rod
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention relates to a deformation monitoring system of a pull rod type corrugated pipe, and belongs to the technical field of electric power operation and maintenance. The monitoring system comprises a displacement sensor, a pressure sensor and a pressure sensor, wherein the displacement sensor is fixed on the flange plate and used for measuring the displacement of the corrugated pipe when the expansion amount of the corrugated pipe is within the moving range of the pull rod; the strain sensor is fixed on the pull rod and used for measuring the stress of the pull rod after the expansion and contraction amount of the corrugated pipe exceeds the movement range of the pull rod; the temperature sensor is fixed on the flange plate; the monitoring device comprises a signal acquisition unit and a data processing unit; the displacement sensor, the strain sensor and the temperature sensor are all connected with the signal acquisition unit so as to obtain the deformation state of the corrugated pipe through data measured by the displacement sensor, the strain sensor and the temperature sensor. The invention realizes the comprehensive monitoring of the corrugated pipe shape, only needs to install a corresponding sensor on the pull rod type corrugated pipe, does not need to change the structure of the GIS body, and is very convenient to disassemble and install.
Description
Technical Field
The invention relates to a deformation monitoring system of a pull rod type corrugated pipe, and belongs to the technical field of electric power operation and maintenance.
Background
SF6The single-phase length of the bus tube of the gas insulated metal enclosed combined electrical apparatus (GIS combined electrical apparatus for short) reaches two hundred meters, which is convenient for the installation of the long bus tube, the compensation of the relative displacement between the foundations, the compensation of the expansion and contraction caused by heat expansion and cold contraction and the likeThe displacement changes, and the high-voltage combined electrical apparatus usually selects a metal corrugated pipe as a connecting part between two adjacent equipment shells. In the field application process, the combined electrical apparatus, especially the tubular long bus, is found to have the phenomena of relative displacement and the like due to the change of environmental temperature difference or the occurrence of foundations, and the sealing part of the bus connecting part can be fatigued due to the excessive stretching or contraction of the corrugated pipe, so that the accidents of breakdown caused by insulation reduction due to poor sealing, leakage of an insulating medium and the like are caused. Therefore, bellows expansion and contraction amount monitoring becomes one of important items of daily operation and maintenance of primary equipment.
A conventional bellows expansion and contraction amount monitoring method adopts a ruler measurement method, one end of a ruler is welded on a bellows flange, and the expansion and contraction amount of a GIS bellows is directly measured at the other end of the ruler by a scale checking method. And the measuring scale determines the scale range and the length of the scale according to the annual expansion amount of the corrugated pipe of the GIS equipment. However, the measurement method has low monitoring efficiency and low precision, and cannot remotely transmit the monitored bellows displacement in real time, which is not beneficial to the development of high-efficiency operation and maintenance work.
For this purpose, it is proposed to monitor the amount of expansion and contraction of the bellows by means of a linear displacement sensor, for example: the utility model discloses a chinese utility model patent of grant publication number CN207132874U, this patent document disclose a micro displacement detector of GIS bellows expansion joint, and this detector has realized the monitoring to the bellows volume of stretching out and drawing back through installing linear displacement sensor on the flange to with the direct demonstration of result that detects, reduced the work load that the fortune dimension personnel looked round, improved work efficiency.
However, when the above patent documents are monitored, only when the bellows moves within the range, the amount of expansion and contraction can be monitored, and when the bellows exceeds the moving range, the deformation state is not monitored continuously, and for the pull rod type bellows, the pull rod is broken or pressed to be broken when the bellows is applied in engineering, so that the bellows is uncontrollable and causes equipment failure.
In sum, the existing monitoring mode is single and not comprehensive enough.
Disclosure of Invention
An object of the application is to provide a deformation monitoring system of pull rod formula bellows for it is single to solve current monitoring mode, problem comprehensive inadequately.
In order to achieve the above object, the present application provides a technical scheme of a deformation monitoring system for a pull rod type corrugated pipe, including:
the displacement sensor is fixed on the flange plate and used for measuring the displacement of the corrugated pipe when the expansion amount of the corrugated pipe is within the moving range of the pull rod;
the strain sensor is fixed on the pull rod and used for measuring the stress of the pull rod after the expansion and contraction amount of the corrugated pipe exceeds the movement range of the pull rod;
the temperature sensor is fixed on the flange plate and used for measuring the working environment temperature of the corrugated pipe;
the monitoring device comprises a signal acquisition unit for receiving the output data of each sensor and a data processing unit for processing and judging the output data of the signal acquisition unit;
the displacement sensor, the strain sensor and the temperature sensor are all connected with the signal acquisition unit so as to obtain the deformation state of the corrugated pipe through data measured by the displacement sensor, the strain sensor and the temperature sensor.
The technical scheme of the deformation monitoring system of the pull rod type corrugated pipe has the beneficial effects that: according to the invention, the strain sensor is additionally arranged on the pull rod, and when the expansion amount of the corrugated pipe is within the moving range of the pull rod, the expansion amount of the corrugated pipe is monitored through the displacement sensor; after the flexible volume of bellows surpassed the removal scope of pull rod, monitor the form of bellows through strain transducer, temperature sensor gathers the operational environment temperature of bellows simultaneously, guarantees the comprehensive monitoring of bellows. According to the invention, only the corresponding sensor is required to be arranged on the pull rod type corrugated pipe, the structure of the GIS body is not required to be changed, and the disassembly and the assembly are very convenient. And the detection device can be used as a standard before the intelligent GIS product leaves the factory, and the multidimensional sensing capability of the high-voltage GIS is improved.
Furthermore, in order to avoid the interference of strong electromagnetism to the displacement sensor under the complex working condition of on-site operation, the displacement sensor is a fiber grating displacement sensor and comprises a fixed seat, a telescopic rod is arranged on the fixed seat, the fixed seat is arranged on the inner side of one flange, the telescopic rod is pressed between the fixed seat and the other flange, and a grating is arranged in the fixed seat.
Furthermore, in order to avoid the interference of strong electromagnetism to the strain sensor under the complex working condition of field operation, the strain sensor is a fiber grating strain sensor, and a grating of the strain sensor is attached to the pull rod.
Furthermore, in order to avoid the monitoring device from being interfered by strong electromagnetism, the fiber bragg grating displacement sensor is connected with a signal acquisition unit of the monitoring device through an optical fiber, and the monitoring device is arranged at a far end.
Furthermore, in order to avoid the monitoring device from being interfered by strong electromagnetism, the fiber grating strain sensor is connected with a signal acquisition unit of the monitoring device through an optical fiber, and the monitoring device is arranged at a far end.
Furthermore, in order to avoid the interference of strong electromagnetism to the temperature sensor under the complex working condition of field operation, the temperature sensor is a fiber grating temperature sensor, and the fiber grating temperature sensor is arranged in a fixing seat of the fiber grating displacement sensor.
Furthermore, in order to detect the expansion amount of the corrugated pipe in an omnibearing manner, the flange plate is provided with 4 displacement sensors at uniform intervals in the circumferential direction.
Furthermore, in order to comprehensively detect the stress of the pull rod and obtain more accurate form change of the corrugated pipe, a plurality of pull rods are arranged in the circumferential direction of the flange plate, and the two pairs of symmetrically arranged pull rods are respectively and fixedly provided with a strain sensor.
Further, in order to realize the communication with the monitoring platform, the monitoring device further comprises a communication conversion unit for communicating with the monitoring platform.
Furthermore, the monitoring device further comprises a power module for supplying power to the monitoring device.
Drawings
FIG. 1 is a schematic structural diagram of a system for monitoring deformation of a bellows with tie rods according to the present invention;
FIG. 2 is a schematic view of the installation of various sensors of the present invention;
in the figure: 1 is M20 hexagon nut, 2 is M20 gasket, 3 is fiber grating strain transducer, 4 ripples of bellows, 5 is the pull rod, 6 is the ring flange, 7 is fiber grating displacement sensor, 71 is the fixing base, 72 is the telescopic link.
Detailed Description
Deformation monitoring system embodiment of pull rod formula bellows:
the deformation monitoring system of the pull rod type corrugated pipe is shown in fig. 1 and comprises a fiber grating strain sensor, a fiber grating displacement sensor, a fiber grating temperature sensor and a monitoring device. The monitoring device comprises a power module, a signal acquisition unit, a data processing unit and a communication conversion unit.
The concrete structure of pull rod formula bellows is shown in fig. 2, including a pair of ring flange 6 of relative setting to and the ripples 4 of the bellows of setting in a pair of ring flange 6 inboard, a plurality of pull rod 5 alternates on a pair of ring flange 6 to evenly arrange along the circumferencial direction of ring flange 6, pull rod 5 passes through M20 hex nut 1 to be fixed on ring flange 6, and set up M20 gasket 2 between ring flange 6 and the M20 hex nut 1.
The fiber grating displacement sensor 7 comprises a fixed seat 71, a telescopic rod 72 is arranged on the fixed seat 71, the fixed seat 71 is installed on the inner side of one flange plate 6, the telescopic rod 72 is pressed between the fixed seat 71 and the other flange plate 6, a grating of the fiber grating displacement sensor 7 is arranged in the fixed seat 71 and used for measuring the displacement of the telescopic rod 72, and the displacement of the telescopic rod 72 is converted into the grating change in the fixed seat 71 so as to measure the displacement of the corrugated pipe. And 4 fiber bragg grating displacement sensors 7 are uniformly arranged in the circumferential direction of the flange plate 6 at intervals, and the displacement measurement of the corrugated pipe in all directions is realized in the moving range of the pull rod 5 by taking the movable middle position of the pull rod 5 as a zero displacement position. The fiber bragg grating displacement sensor 7 is connected with a signal acquisition unit of a monitoring device through an optical fiber, the monitoring device is arranged at a far end, and the far end refers to the position in a nearby GIS control cabinet or other positions far away from strong electromagnetic interference.
The number of the fiber grating strain sensors 3 is 4, the fiber grating strain sensors are respectively fixed on two pairs of pull rods 5 which are symmetrically arranged through clamps, gratings in the fiber grating strain sensors 3 are attached to the pull rods 5 and used for collecting tensile force or extrusion force in opposite directions of two sides of two flange plates 6 after the expansion amount of the pull rod type corrugated pipe exceeds the moving range of the pull rods 5, and the deformation tendency of the corrugated pipe exceeds the moving range is reflected through the stress of the pull rods 5. The fiber grating strain sensor 3 is connected to a signal acquisition unit of the monitoring device through an optical fiber.
The fiber grating temperature sensors are embedded in the fixing seats 71 of the fiber grating displacement sensors 7, the number of the fiber grating temperature sensors is the same as that of the fiber grating displacement sensors 7, and the fiber grating temperature sensors are used for collecting the temperature of the pull rod type corrugated pipe so as to compensate the output data of the fiber grating displacement sensors 7 where the fiber grating temperature sensors are located and obtain accurate displacement wavelength output data.
For a plurality of pull rod type corrugated pipes, the fiber bragg grating sensors are networked in a serial connection mode and are connected with the monitoring device through optical fibers after being connected in series, and therefore the simultaneous online monitoring of the pull rod type corrugated pipes is achieved.
The power supply module is used for providing a stable power supply for the monitoring device, the input end of the power supply module is connected with a working power supply of the transformer substation AC220V, a stable direct current power supply is output through the internal AC/DC conversion module, and the output end of the power supply module is connected with the signal acquisition unit, the data processing unit and the communication conversion unit. The power module has strong electromagnetic interference inhibition capacity, meets the protection requirement of on-site severe electromagnetic working conditions, has high power supply ripple rejection ratio, and meets the requirement of a precise signal conditioning circuit.
The signal acquisition unit comprises a signal input interface, a signal adjusting module and a signal communication module, wherein the signal input interface is used for connecting each sensor with the monitoring device; the signal demodulation module is used for realizing signal emission of the laser source of each sensor, receiving wavelength data output by each sensor at the same time, conditioning and filtering the wavelength data and transmitting the conditioned and filtered wavelength data to the signal communication module; and the signal communication module carries out data encapsulation on the obtained wavelength data and transmits the wavelength data to the data processing unit in an RS-485 format.
The data processing unit comprises a microprocessor (ARM) and a memory module (FRAM), and the microcontroller (ARM) comprises a data preprocessing module, a data calculating module and a fault diagnosis module.
The data preprocessing module is used for preprocessing the wavelength data output by the signal acquisition unit to obtain average data of the wavelength data; storing the obtained average data into a memory module (FRAM), and simultaneously carrying out data processing on the obtained average data in a data calculation module according to the performance parameters and the physical quantity formula of each sensor (if the system is powered on for the first time, the performance parameter information and the required physical quantity calculation formula of each sensor are written into the memory module and stored through upper computer software, and the data are directly read in the next operation), so that the digital signals of the physical quantities to be measured are obtained: stress digital signals in four directions, temperature digital signals in four directions and displacement digital signals in four directions; and the physical quantity digital signal is sent to a fault diagnosis module, the fault diagnosis module carries out deformation state analysis, fault analysis and other processing according to the physical quantity digital signal, and the obtained accurate state information of the corrugated pipe is transmitted to a communication conversion unit.
The fault diagnosis module comprises a BP neural network model optimized by a genetic algorithm, the weight and the threshold of the BP neural network model are determined through training set data, and then the processed physical quantity digital signals are input into the BP neural network model, so that the deformation state of the corrugated pipe can be diagnosed.
The communication conversion unit comprises a data caching module and a communication and protocol conversion module. The data cache module is used for realizing data cache between the microprocessor (ARM) and the communication and protocol conversion module, carrying out rate matching and transmitting the calculated physical quantity data and the fault diagnosis result to the communication and protocol conversion module through the data cache module. And the communication and protocol conversion module provides a physical communication interface and performs protocol conversion with the monitoring platform, namely, the obtained final physical quantity data and the fault diagnosis result are converted into a universal IEC61850 protocol and uploaded to the transformer substation integrated monitoring platform.
In the above embodiment, in order to avoid the influence of strong electromagnetic waves on the collected data, all the sensors adopt fiber grating sensors, and as another embodiment, each sensor can adopt a common sensor to measure each data without considering strong electromagnetic interference. Of course, when a common sensor is used for measurement, a common communication cable is used for data transmission, and optical fibers are not needed.
In the above embodiment, in order to obtain displacement and form data of the bellows more accurately, 4 fiber grating displacement sensors 7 are disposed in different orientations of the flange 6, and 4 fiber grating strain sensors 3 are disposed on different pull rods 5, as another embodiment, 3 or less fiber grating displacement sensors 7 and 3 or less fiber grating strain sensors 3 may be disposed, as long as corresponding data can be measured, and the number of the sensors is not limited in the present invention.
In the above embodiment, in order to ensure the reliability of the power supply of the monitoring device, a power supply module is disposed in the monitoring device, and of course, an external power supply mode may also be adopted for the power supply of the monitoring device, which is not limited in the present invention.
In the above embodiment, the fiber grating temperature sensor is disposed in the fixing base 71 of the fiber grating displacement sensor 7 in order to simplify the mounting structure, but as another embodiment, the fiber grating temperature sensor may be mounted separately and directly mounted inside the flange plate 6 at one end.
In the above embodiments, in order to implement communication with the monitoring platform, the monitoring device includes a communication conversion unit, and as another embodiment, the communication conversion unit may not be provided in the case of not considering communication with the monitoring platform.
The invention realizes the monitoring of the deformation state of the pull rod type corrugated pipe at different periods through the fiber grating strain sensor 3, the fiber grating displacement sensor 7 and the fiber grating temperature sensor, and has important significance for the essential analysis of the corrugated pipe.
Claims (10)
1. A deformation monitoring system of pull rod formula bellows, its characterized in that includes:
the displacement sensor is fixed on the flange plate and used for measuring the displacement of the corrugated pipe when the expansion amount of the corrugated pipe is within the moving range of the pull rod;
the strain sensor is fixed on the pull rod and used for measuring the stress of the pull rod after the expansion and contraction amount of the corrugated pipe exceeds the movement range of the pull rod;
the temperature sensor is fixed on the flange plate and used for measuring the working environment temperature of the corrugated pipe;
the monitoring device comprises a signal acquisition unit for receiving the output data of each sensor and a data processing unit for processing and judging the output data of the signal acquisition unit;
the displacement sensor, the strain sensor and the temperature sensor are all connected with the signal acquisition unit so as to obtain the deformation state of the corrugated pipe through data measured by the displacement sensor, the strain sensor and the temperature sensor.
2. A system for monitoring deformation of a corrugated tension rod according to claim 1, wherein the displacement sensor is a fiber grating displacement sensor, and comprises a fixed base, the fixed base is provided with a telescopic rod, the fixed base is mounted inside one flange, the telescopic rod is pressed between the fixed base and the other flange, and a grating is disposed in the fixed base.
3. The system for monitoring the deformation of a corrugated tension rod according to claim 1, wherein the strain sensor is a fiber grating strain sensor, and a grating of the strain sensor is attached to the tension rod.
4. The system for monitoring the deformation of the pull rod type corrugated pipe according to claim 2, wherein the fiber grating displacement sensor is connected with a signal acquisition unit of a monitoring device through an optical fiber, and the monitoring device is arranged at a far end.
5. The system for monitoring the deformation of the pull rod type corrugated pipe according to claim 3, wherein the fiber grating strain sensor is connected with a signal acquisition unit of a monitoring device through an optical fiber, and the monitoring device is arranged at a far end.
6. The system for monitoring the deformation of the pull rod type corrugated pipe according to claim 2, wherein the temperature sensor is a fiber grating temperature sensor, and the fiber grating temperature sensor is arranged in a fixed seat of a fiber grating displacement sensor.
7. A system for monitoring deformation of a corrugated tension rod-type bellows as claimed in claim 1 or 2, wherein the flange is provided with 4 displacement sensors at regular intervals in the circumferential direction.
8. A system for monitoring deformation of a corrugated tension rod tube according to claim 1 or 3, wherein a plurality of tension rods are arranged around the circumference of the flange, and a strain sensor is fixed on each of the two pairs of symmetrically arranged tension rods.
9. The system of claim 1, wherein the monitoring device further comprises a communication conversion unit for communicating with a monitoring platform.
10. The system of claim 1, wherein the monitoring device further comprises a power module configured to provide power to the monitoring device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010948884.9A CN112461145B (en) | 2020-09-10 | 2020-09-10 | Deformation monitoring system of pull rod type corrugated pipe |
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| CN202010948884.9A CN112461145B (en) | 2020-09-10 | 2020-09-10 | Deformation monitoring system of pull rod type corrugated pipe |
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| CN112461145B CN112461145B (en) | 2022-07-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115014612A (en) * | 2022-06-29 | 2022-09-06 | 马鞍山钢铁股份有限公司 | Pipeline real-time stress monitoring device and stress adjusting method thereof |
| CN115200884A (en) * | 2021-04-09 | 2022-10-18 | 广州汽车集团股份有限公司 | Corrugated pipe road spectrum detection device and service life detection method |
| CN116625437A (en) * | 2023-07-21 | 2023-08-22 | 沈阳仪表科学研究院有限公司 | Multi-parameter metal corrugated pipe on-line monitoring device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116625437A (en) * | 2023-07-21 | 2023-08-22 | 沈阳仪表科学研究院有限公司 | Multi-parameter metal corrugated pipe on-line monitoring device and method |
| CN116625437B (en) * | 2023-07-21 | 2023-10-03 | 沈阳仪表科学研究院有限公司 | Multi-parameter metal corrugated pipe on-line monitoring device and method |
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|---|---|
| CN112461145B (en) | 2022-07-26 |
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