CN110596578A - Non-contact measuring device for deformation of GIS (gas insulated switchgear) - Google Patents
Non-contact measuring device for deformation of GIS (gas insulated switchgear) Download PDFInfo
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- CN110596578A CN110596578A CN201910813372.9A CN201910813372A CN110596578A CN 110596578 A CN110596578 A CN 110596578A CN 201910813372 A CN201910813372 A CN 201910813372A CN 110596578 A CN110596578 A CN 110596578A
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Classifications
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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
-
- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
-
- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
Abstract
The invention discloses a non-contact measuring device for GIS equipment deformation. The invention comprises a target, an industrial camera as a displacement sensor, a data transmission unit, a data acquisition and processing unit and a communication unit; the reflective or luminous marker of the target is imaged on the COMS image sensor through an optical lens in the industrial camera to obtain a frame image, the frame image of the reflective or luminous marker of the target is transmitted to the data acquisition and processing unit through the data transmission unit, and the data acquisition and processing unit extracts the characteristic points of the target of the frame image; and uploading the coordinate information of the target after image processing to a cloud server through a communication unit. The measuring device solves the problems of low working efficiency, high error probability, large error, inconvenient data reading and the like of the traditional mechanical measuring scale, and ensures the online monitoring and normal operation of the state of the GIS equipment and the safety of detection personnel.
Description
Technical Field
The invention belongs to the technical field of monitoring of power transformation equipment of a power system, and particularly relates to a non-contact measurement method and device for GIS equipment deformation.
Background
The gas insulated switchgear GIS is a metal enclosed switchgear using sulfur hexafluoride gas as an insulating medium. The novel gas-insulated metal-enclosed switchgear is widely applied to power systems at home and abroad, and is more and more widely applied to power grids.
The GIS combined equipment adopts long distance, multi-section segmentation splicing and overhead installation. In consideration of design, manufacturing, installation and other errors, and expansion and contraction due to heat and cold, foundation settlement, equipment vibration and other factors generated by temperature change in the operation process, corrugated pipe expansion joints are often additionally arranged at the joints of the segments of the GIS and used for compensating for the displacement of the GIS such as expansion and contraction due to heat and cold, foundation settlement and the like. Under the condition of environmental temperature change, the expansion joint of the corrugated pipe frequently bears the change of stretching and contraction, and is easy to cause fatigue failure. In addition, when the expansion joint of the corrugated pipe is clamped and fails, the expansion joint cannot completely compensate the changes of expansion with heat and contraction with cold, so that the phenomena of cabin body welding line cracking, gas leakage, ground discharge breakdown, bus connection position extraction or top death and the like are caused, and finally equipment damage or even personnel injury is caused, and bus faults directly influence power supply of a power grid, so that large-area power limiting and power failure are caused.
At present, the GIS equipment and the deformation and displacement of the expansion joint are mainly measured by mounting a mechanical measuring scale on the expansion joint or making manual marks at a support for indicating the macroscopic deformation displacement of the GIS equipment. The mechanical measurement needs manual work, the measurement result needs manual reading and recording, the working efficiency is low, the error is large, real-time measurement cannot be realized, and the accuracy and the continuity of deformation monitoring of GIS equipment and expansion joints are greatly influenced. The measurement mode also relates to the problems of field inspection of detection personnel, data recording of high-altitude operation and the like. As an important factor influencing the state of the GIS equipment, the deformation or displacement of the GIS equipment and the expansion joint needs an effective and accurate online monitoring means.
As can be seen from field investigation, the current major methods for monitoring the structural state of a GIS are to inspect these components for macroscopic damage by inspection, visual inspection or field contact measurement. And (3) checking a mechanical measuring scale on the expansion joint, and checking whether a supporting mechanism, a connecting mechanism and the like of the equipment have zero clearance and damage. The sealing element has no trace of oil leakage and air leakage, the connecting rod has no deformation, the structural member has no deformation, and the paint layer has no peeling off. The external connecting conductor, the pipeline system and the valve have no damage.
At present, no research report is available on monitoring the structural state of the GIS, particularly on measuring the deformation or displacement of high-voltage electrical equipment such as a GIS in a remote, non-contact and high-precision manner by a non-contact measuring method. There is no definite standard for the cause of GIS structure state displacement and deformation and the change and range of monitoring index, and the cause can be judged only by the fault trace after the bus compartment has a fault. Because the GIS equipment integral structure is lack of effective supervision, the tank body of the GIS equipment cracks, leaks gas, the support deforms, and failure accidents such as expansion joint instability and the like are high in recent years. Once an accident occurs, the method not only brings huge economic loss to enterprises and brings safety threat to personnel and environment, but also causes adverse social influence. Therefore, the GIS structure state non-contact real-time displacement or deformation online monitoring and early warning system is designed and developed, and has important display significance and use value.
Disclosure of Invention
Aiming at the defects of manual inspection visual inspection or field contact mechanical measurement scale of the GIS structural state in the prior art, the invention provides a non-contact measurement device for GIS equipment deformation, which solves the problems of low working efficiency, high error probability, large error, inconvenient data reading and recording and the like of the traditional contact mechanical measurement scale and ensures the online monitoring, normal operation and safety of detection personnel of the GIS equipment state.
Therefore, the technical scheme adopted by the invention is as follows: a non-contact measuring device for GIS equipment deformation comprises a target, an industrial camera serving as a displacement sensor, a data transmission unit, a data acquisition and processing unit and a communication unit; the target comprises a reflective or luminous moving target and a reference target; the industrial camera comprises a COMS image sensor and an optical lens, and the focal length of the optical lens is determined by the distance between the COMS image sensor and a target.
The reflective or luminous marker of the target is imaged on the COMS image sensor through an optical lens in the industrial camera to obtain a frame image, the frame image of the reflective or luminous marker of the target is transmitted to the data acquisition and processing unit through the data transmission unit, and the data acquisition and processing unit extracts the characteristic points of the target of the frame image; and uploading the processed image information to a cloud server through a communication unit.
The invention introduces photogrammetry technology to thoroughly change the traditional mechanical displacement measurement scale. The photogrammetry technology can instantly obtain a large amount of physical information and geometric information of the measured target, does not interfere with the natural state of the measured object, has high measurement precision, is suitable for measuring the motion state of the dynamic target, and can work under all-weather natural conditions. On the basis of improving the mechanical displacement measurement scale, the monitoring method of replacing the traditional mechanical displacement measurement scale with the photogrammetric device can solve the problems that the traditional mechanical displacement measurement scale is low in working efficiency, large in error, inconvenient in data reading and recording, incapable of monitoring in real time and the like.
Further, the data acquisition and processing unit implements digital image gray scale transformation, image preprocessing, image binarization, marker image edge extraction and image center fitting technologies on the target in the shot frame image, so as to complete processing, identification, coordinate extraction, positioning and data processing of the target image information, thereby realizing extraction of the target feature points of the frame image.
Furthermore, according to the shape and the size of the target feature point, in order to accurately determine the two-dimensional coordinates of the target image center, a least square method is selected, namely, the image center is fitted by minimizing the error square sum of the objective function.
Further, the processed image information is converted into target space coordinate information of the target at different time, and the collected target space coordinate information is uploaded to a cloud server by using a communication unit and is further processed.
Furthermore, the cloud server is provided with a GIS state monitoring and early warning system for analyzing, storing, judging and outputting the uploaded data.
Further, the flow of the GIS state monitoring and early warning system is as follows: inputting field monitoring parameters, and comparing and judging the field monitoring parameters with data containing material properties, stress states and operation standards; if the material property, the stress state and the operation standard are met, outputting and displaying a monitoring result; and if not, starting monitoring and early warning, and outputting the early warning.
Furthermore, the mobile target is fixed on a flange of a GIS expansion joint needing deformation monitoring, and the reference target is fixed on a steel structure support beside the expansion joint.
Furthermore, the mobile target is fixed at one end of the expansion joint mechanical measurement scale which needs to monitor displacement, and the reference target is fixed at the other end of the expansion joint mechanical measurement scale which needs to monitor displacement.
Further, the effective distance between the target and the industrial camera is in the range of 1-100 meters.
The invention has the beneficial effects that: the measuring device belongs to a non-contact deformation measuring device, has the advantages of two-dimensional real-time deformation or displacement measurement, high measuring precision, large range and quick response, and is suitable for non-contact, long-term, real-time and multi-point automatic measurement. The measuring device solves the problems of low working efficiency, high error probability, large error, inconvenience in data reading and recording and the like of the traditional contact mechanical measuring scale, and ensures the online monitoring and normal operation of the GIS equipment state and the safety of detection personnel.
Drawings
FIG. 1 is a schematic structural diagram of a non-contact measurement device for the deformation of an expansion joint of GIS equipment according to the present invention;
FIG. 2 is a schematic diagram of the measurement of an industrial camera (i.e., displacement sensor) of the present invention;
FIG. 3 is a schematic diagram of the self-correcting target of the present invention;
FIG. 4 is a flow chart of the GIS structural state monitoring and early warning system of the present invention;
FIG. 5 is a schematic diagram of the present invention for measuring GIS main pipe movable support horizontal displacement.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Example 1
Fig. 1 shows a non-contact measurement device for deformation of a GIS device, which comprises a target 1, an industrial camera 2 as a displacement sensor, a data transmission unit 3, a data acquisition and processing unit 4 and a communication unit 5; the target comprises a reflective or luminous moving target and a reference target; the industrial camera comprises a COMS image sensor and an optical lens, and the focal length of the optical lens is determined by the distance between the COMS image sensor and a target.
Within the monitoring field range (measuring range +/-500 mm), a reference target is arranged for setting a reference origin O.
Under the condition of a mechanical measuring scale, the mobile target is fixed at one end of the expansion joint mechanical measuring scale needing to monitor displacement, and the reference target is fixed at the other end of the expansion joint mechanical measuring scale needing to monitor displacement; the mechanical measuring scale is a pair of stainless steel rulers which slide relatively, one is relatively static, and the other moves relatively, and is just used for fixing a reference target and moving the target. Under the condition that no mechanical measuring scale exists, the mobile target is fixed on a flange of a GIS expansion joint needing deformation monitoring, and the reference target is fixed on a steel structure support beside the expansion joint.
As shown in fig. 3, the target 1 has three markers 11, 12, 13 (reflective or luminous markers) for calibration and image recognition of an industrial camera composed of a cmos image sensor and an optical lens, and is fixed at both ends of a mechanical measurement scale of an expansion joint requiring displacement monitoring, and the effective monitoring distance from the displacement sensor is 1-100 m.
The markers 11, 12, 13 (reflective or luminous markers) of the target 1 are imaged on the cmos image sensor through the optical lens in the industrial camera 2, the target image is processed and identified and positioned with high precision through the data acquisition processing unit, the precise position of the image point is determined, and finally the position coordinates of the target in the actual moving plane are determined by the object-image relationship, as shown in fig. 2.
The target has an effective distance to the industrial camera in the range of 1-100 meters, and the target has length calibration and calibration functions in addition to the marker function, since the distance and position of the reflective or luminescent markers 11, 12, 13 in the target are determined and known.
According to the non-contact measuring device that actual demand GIS equipment warp satisfies, the monitoring distance: 1-100 m; resolution ratio: 1X 10-6m; and (3) measuring precision: 0.5mm (50 m distance); measuring range: 500 mm.
The reflective or luminous marker of the target is imaged on the COMS image sensor through an optical lens in the industrial camera to obtain a frame image, the frame image of the target marker is transmitted to the data acquisition and processing unit through the data transmission unit, and the data acquisition and processing unit extracts target feature points of the frame image; the processed image information is converted into target space coordinate information of different time, and the collected target space coordinate information is uploaded to a cloud server by using a communication unit and is further processed.
The data acquisition and processing unit implements digital image gray scale transformation, image preprocessing, image binarization, marker image edge extraction and image center fitting technologies on a target in the shot frame image, namely processing, identification, coordinate extraction, positioning and data processing of target image information are completed by embedded software, so that extraction of the target feature points of the frame image is realized.
According to the shape and the size of the target feature points, in order to accurately determine the two-dimensional coordinates of the target image center, a least square method is selected, namely the image center is fitted by minimizing the sum of squares of errors of a target function. And the cloud server is provided with a GIS state monitoring and early warning system for analyzing, storing, judging and outputting the uploaded data in an early warning way. As shown in fig. 4, the flow of the GIS state monitoring and early warning system is as follows: inputting field monitoring parameters, and comparing and judging the field monitoring parameters with data containing material properties, stress states and operation standards; if the material property, the stress state and the operation standard are met, outputting and displaying a monitoring result; and if not, starting monitoring and early warning, and outputting the early warning.
Example 2
The present embodiment is basically the same as the measuring device used in embodiment 1, except that the deformation of the GIS expansion joint (the planar displacement on the target monitoring plane) is monitored, the present embodiment can also be used for monitoring the horizontal displacement of the GIS main pipe movable support, as shown in fig. 5, the GIS main pipe 6 is fixed on the movable support sliding end 7, the movable support sliding end 7 is placed on the movable support base 8, the target 9 is respectively fixed on the movable support sliding end 7 and the base 8, because the movable support only moves horizontally on the target monitoring plane, the displacement before and after the sliding end 7 moves horizontally can be measured by using a single-point target, that is, the horizontal displacement of the pipeline at the GIS main pipe movable support.
Claims (9)
1. A non-contact measurement device for GIS equipment deformation is characterized by comprising a target (1), an industrial camera (2) serving as a displacement sensor, a data transmission unit (3), a data acquisition and processing unit (4) and a communication unit (5); the target comprises a reflective or luminous moving target and a reference target; the industrial camera comprises a COMS image sensor and an optical lens, and the focal length of the optical lens is determined by the distance between the COMS image sensor and a target;
the reflective or luminous marker of the target is imaged on the COMS image sensor through an optical lens in the industrial camera to obtain a frame image, the frame image of the reflective or luminous marker of the target is transmitted to the data acquisition and processing unit through the data transmission unit, and the data acquisition and processing unit extracts the characteristic points of the target of the frame image; and uploading the coordinate information of the target after image processing to a cloud server through a communication unit.
2. The device for non-contact measurement of GIS device deformation according to claim 1, wherein the data acquisition processing unit performs digital image gray scale transformation, image preprocessing, image binarization, marker image edge extraction and image center fitting techniques on the target in the captured frame image, and completes processing, identification, coordinate extraction, positioning and data processing of the frame image information, thereby realizing extraction of the target feature points of the frame image.
3. The device of claim 2, wherein the center of the target image is fitted by minimizing the sum of squared errors of the objective function using least squares to accurately determine the two-dimensional coordinates of the center of the target image according to the shape and size of the target feature points.
4. The device of claim 2, wherein the processed image information is converted into target space coordinate information of different time periods, and the collected target space coordinate information is uploaded to a cloud server by using the communication unit and further processed.
5. The GIS device deformation non-contact measurement device according to any one of claims 1-5, wherein the cloud server is equipped with a GIS state monitoring and early warning system for analyzing, storing, judging and outputting the uploaded data.
6. The device of claim 6, wherein the GIS state monitoring and warning system comprises the following steps: inputting field monitoring parameters, and comparing and judging the parameters with data containing GIS material attributes, stress states and operation standards; if the GIS material property, the stress state and the operation standard are met, outputting and displaying a monitoring result; and if the GIS material attribute, the stress state and the operation standard are not met, starting monitoring and early warning, and outputting the early warning.
7. The device of any one of claims 1-5, wherein the mobile target is fixed to a flange of a GIS expansion joint to be monitored for deformation, and the reference target is fixed to a steel structure bracket beside the expansion joint.
8. The device for non-contact measurement of GIS device deformation according to any of claims 1-5, wherein the moving target is fixed on one end of the expansion joint mechanical measurement scale that needs to monitor displacement, and the reference target is fixed on the other end of the expansion joint mechanical measurement scale that needs to monitor displacement.
9. The device for non-contact measurement of GIS device deformation according to any of claims 1-5, characterized in that the effective distance of the target and the industrial camera is in the range of 1-100 meters.
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| CN201910813372.9A CN110596578A (en) | 2019-08-30 | 2019-08-30 | Non-contact measuring device for deformation of GIS (gas insulated switchgear) |
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| CN201910813372.9A CN110596578A (en) | 2019-08-30 | 2019-08-30 | Non-contact measuring device for deformation of GIS (gas insulated switchgear) |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947590A (en) * | 2020-02-17 | 2020-11-17 | 北京联睿科科技有限公司 | Online detection device, method and system for building deformation |
| CN112254645A (en) * | 2020-11-26 | 2021-01-22 | 江苏国和智能科技有限公司 | Device and method for detecting space attitude of rubber expansion joint |
| CN112504137A (en) * | 2020-12-07 | 2021-03-16 | 北京智博联科技股份有限公司 | Multi-target digital image detection method based on cloud computing |
| CN112583116A (en) * | 2020-11-11 | 2021-03-30 | 国网山西省电力公司营销服务中心 | Intelligent monitoring and early warning device for displacement of extra-high voltage GIS cabin |
| CN113280750A (en) * | 2021-06-09 | 2021-08-20 | 武汉大学 | Three-dimensional deformation monitoring method and device |
| CN114754715A (en) * | 2022-04-15 | 2022-07-15 | 国网山西省电力公司临汾供电公司 | GIS equipment displacement monitoring device |
| CN117333675A (en) * | 2023-10-09 | 2024-01-02 | 国网吉林省电力有限公司 | Monitoring and early warning method and system for GIS expansion joint |
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| CN112583116A (en) * | 2020-11-11 | 2021-03-30 | 国网山西省电力公司营销服务中心 | Intelligent monitoring and early warning device for displacement of extra-high voltage GIS cabin |
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| CN113280750A (en) * | 2021-06-09 | 2021-08-20 | 武汉大学 | Three-dimensional deformation monitoring method and device |
| CN113280750B (en) * | 2021-06-09 | 2022-08-30 | 武汉大学 | Three-dimensional deformation monitoring method and device |
| CN114754715A (en) * | 2022-04-15 | 2022-07-15 | 国网山西省电力公司临汾供电公司 | GIS equipment displacement monitoring device |
| CN114754715B (en) * | 2022-04-15 | 2024-02-09 | 国网山西省电力公司临汾供电公司 | GIS equipment displacement monitoring device |
| CN117333675A (en) * | 2023-10-09 | 2024-01-02 | 国网吉林省电力有限公司 | Monitoring and early warning method and system for GIS expansion joint |
| CN117333675B (en) * | 2023-10-09 | 2024-04-09 | 国网吉林省电力有限公司 | Monitoring and early warning method and system for GIS expansion joint |
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