CN113406209A - Ultrasonic phase control detection model for composite insulator interface and internal defects - Google Patents
Ultrasonic phase control detection model for composite insulator interface and internal defects Download PDFInfo
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- CN113406209A CN113406209A CN202110603070.6A CN202110603070A CN113406209A CN 113406209 A CN113406209 A CN 113406209A CN 202110603070 A CN202110603070 A CN 202110603070A CN 113406209 A CN113406209 A CN 113406209A
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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
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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Abstract
The invention discloses an ultrasonic phase control detection model of a composite insulator interface and internal defects, which comprises a probe and a composite insulator structure to be detected, wherein a water sac device is arranged between the probe and the composite insulator structure to be detected, and the probe is coupled with the water sac device to detect a point to be detected on the composite insulator structure to be detected; the composite insulator structure to be detected comprises a part to be detected and a core rod in the part to be detected. The ultrasonic phase control technology is utilized to carry out nondestructive testing on the composite insulator interface and the internal defects in the air, the operation difficulty of ultrasonic phase control detection and the requirements on the service environment are reduced, the defects are conveniently judged to be the defects inside the interface and the silicon rubber or the defects inside the core rod, and the influence of the defects at different positions inside on the running state of the composite insulator is favorably researched on the premise of not damaging the composite insulator.
Description
Technical Field
The invention relates to the field of state detection of power transmission and transformation equipment, in particular to an ultrasonic phase control detection model for composite insulator interfaces and internal defects.
Background
The composite insulator has the advantages of good antifouling performance, small volume, light weight, high mechanical strength, no detection of zero, less maintenance, convenient transportation and the like, and is widely applied to high-voltage overhead lines. The composite insulator can generate internal defects due to electrical and mechanical faults in the operation process, when the interface between the core rod of the composite insulator and the umbrella skirt sheath has the internal defects, the local field intensity at the defects is larger than that at the non-defects, so that the local discharge at the defects forms a carbonization channel, and even the internal insulation penetration breakdown is developed in severe cases (Wuguanning. theory and practice of electrical equipment state detection [ M ]. Beijing: Qinghua university Press 2005: 190-. The nondestructive testing method for researching the internal defects of the composite insulator has important significance.
The ultrasonic phase control detection method is a method which has higher efficiency and stronger depth detection capability in recent years. The method is characterized in that a composite insulator with a sheath well adhered to a core rod, an air hole in the sheath, a middle section of silicon rubber and poor adhesion of the sheath to the core rod is detected by a phased array ultrasonic method in a laboratory of the electric power academy of southern China university, and feasibility of detecting the internal defects of the composite insulator by the phased array ultrasonic method is preliminarily verified (Xiayianzhen, He Zilan, Lingyuxing and the like. the internal defects of the composite insulator are detected by the phased array ultrasonic wave [ J ]. the report of China Motor engineering, 2012,32(S1): 63-68.). In order to better detect the small-diameter composite insulator, the maintenance company of China network Hubei Power saving Limited company provides a flexible water sac coupling detection method based on an ultrasonic phased array, the minimum detectable defect size of a sheath reaches 0.8mm, and a core rod reaches 1mm (Xutianyong, Dongxiao and Lirong super, etc.. ultrasonic phased array detection research on the internal defects of the composite insulator [ J ] power engineering technology, 2018,37(06):75-79 ]. The composite insulator with abnormal temperature rise fault is horizontally immersed in water by the Hozian of the university of south China, water is used as a coupling medium, and the corrosion defect of the insulator interface is detected by a phased array ultrasonic method (the ultrasonic detection of the artificial internal defect of the composite insulator of the Hozian [ D ]. Guangzhou: university of south China, 2013.). However, the existing research still lacks detection of the internal interface and the defects of the composite insulator in the air, and simultaneously lacks a corresponding method model for comparing and evaluating the detection results.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the prior art, and provides an ultrasonic phase control detection method model for the interface defects of a composite insulator and the internal defects of silicon rubber and a core rod, which is suitable for composite insulators of various voltage grades. The ultrasonic phase control detection instrument is guided to identify the internal interface structure and defects of the composite insulator, the detection result can be predicted and evaluated, the internal defect position of the equipment can be accurately positioned, and the problem that the traditional ultrasonic phase control detection technology cannot take into account of simplicity and accuracy in operation at the same time is solved. According to the method, the ultrasonic probe in the model can complete detection operation in the air, and the detection result is matched with the identification model of the composite insulator interface and the defect, so that positioning detection is realized.
The invention is realized by at least one of the following technical schemes.
An ultrasonic phase control detection model for composite insulator interfaces and internal defects comprises a probe and a composite insulator structure to be detected, wherein a water sac device is arranged between the probe and the composite insulator structure to be detected, and the probe is coupled through the water sac device to detect a point to be detected on the composite insulator structure to be detected; the composite insulator structure to be detected comprises a part to be detected and a core rod in the part to be detected.
Preferably, the water sac device is a sleeve made of rubber, and the water sac device is sealed after water is flushed into the water sac device.
Preferably, gel coupling agents are coated between the probe and the water bag device and between the water bag device and a point to be measured on the part to be measured.
Preferably, the water bag device comprises a water bag, a water injection port positioned on the water bag and an ultrasonic wedge block positioned in the water bag.
Preferably, the downward surface of the ultrasonic wedge is arc-shaped.
Preferably, the water sac is a silicon rubber film, and the film material is silicon rubber.
Preferably, the material of the ultrasonic wedge is polystyrene.
Preferably, the part to be tested is a composite insulator material.
Preferably, the wafer array of the probe is axially aligned with the part to be tested.
Preferably, the base material of the core rod is epoxy resin, and the shape of the core rod is cylindrical.
Compared with the prior art, the invention has the beneficial effects that:
the method utilizes the ultrasonic phase control technology to detect the defects of the interface and the interior of the composite insulator in the air, and reduces the operation difficulty of the ultrasonic phase control detection and the requirements on the use environment; the ultrasonic phase control technology is used for detecting the interface structure and the defects of the composite insulator, so that the defects can be conveniently judged to be the defects of the interface, the interior of silicon rubber or the interior of the core rod. The ultrasonic detection technology is nondestructive detection, and the method model provided by the invention is beneficial to researching the influence of different internal defects on the running state of the composite insulator on the premise of not damaging the composite insulator.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.
FIG. 1 is a diagram of a composite insulator for ultrasonic phase-controlled detection according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an ultrasonic testing process according to a first embodiment of the present invention;
FIG. 3 is a sector-scan waveform of the predicted detection result according to one embodiment of the present invention;
FIG. 4 is a sector-scan waveform diagram of an actual detection result according to one embodiment of the present invention;
FIG. 5 is a diagram of a composite insulator object for ultrasonic phase-controlled detection in the second embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an ultrasonic testing process in the second embodiment of the present invention;
FIG. 7 is a sector-scan waveform of the predicted detection result according to the second embodiment of the present invention;
FIG. 8 is a sector-scanning waveform diagram of an actual detection result according to a second embodiment of the present invention;
FIG. 9 is a diagram of a water bladder arrangement according to a third embodiment of the present invention;
FIG. 10 is a schematic view of a water-bag device according to a third embodiment of the present invention;
FIG. 11 is a diagram of a photocurrent sensor according to a fourth embodiment of the invention;
FIG. 12 is a schematic diagram of a process of detecting photocurrent sensor by ultrasound in accordance with a fourth embodiment of the present invention;
the method comprises the following steps of 11-an ultrasonic probe, 12-a water bag, 13-a sheath, 14-a core rod, 15-a composite insulator to be detected, 101-a defect point, 2-a water bag device, 21-a water injection port, 22-an ultrasonic wedge block, 23-a silicon rubber film, 3-a light current transformer, 31-a core rod and 32-a flange.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1, an ultrasonic phase control detection model of composite insulator interface and internal defect comprises an ultrasonic probe 11, a water sac device 2 and a composite insulator structure to be detected. The composite insulator structure to be detected comprises a part to be detected and a core rod 14 inside the part to be detected. Gel coupling agent is coated between the ultrasonic probe 11 and the water bag device 2 and between the water bag device 2 and a point to be measured on the part to be measured, so that the wafer array of the ultrasonic probe 11 is ensured to be axially consistent with the part to be measured. In the detection process, the ultrasonic probe carries out coupling detection through the water sac device.
The method comprises the steps of forming a structural schematic diagram before detection, predicting a scanned waveform image, and evaluating a specific operation method and a detection result in the detection process and determining the defect condition. The ultrasonic phase control technology is utilized to carry out nondestructive testing on the composite insulator interface and the internal defects in the air, the operation difficulty of ultrasonic phase control detection and the requirements on the service environment are reduced, the defects are conveniently judged to be the defects inside the interface and the silicon rubber or the defects inside the core rod, and the influence of the defects at different positions inside on the running state of the composite insulator is favorably researched on the premise of not damaging the composite insulator.
The first embodiment is as follows:
in this embodiment, the component to be measured is a composite insulator 15, the composite insulator 15 includes a sheath 13 and a core rod 14, and after the composite insulator 15 is transversely cut, a defect point 101 with a diameter of 1.5mm and a depth of about 25mm is artificially manufactured on the side far away from the water sac device 2.
As shown in fig. 2, before detection, a composite insulator structure forms a corresponding detection schematic diagram, where a1 is the surface of the water sac device 2, b1 is the upper surface of the sheath, c1 is the upper interface of the sheath and the core rod, d1 is the lower interface of the sheath and the core rod, and e1 is the lower surface of the sheath.
As shown in fig. 3, a sector-scan waveform image is derived. a is a reflected echo of the surface of the water bag device 2, b is a reflected echo of the upper surface of the sheath, c is a reflected echo of an upper interface of the sheath and the core rod, d is a reflected echo of a lower interface of the sheath and the core rod, e is a reflected echo of the lower surface of the sheath, 10 is an artificial defect reflected echo, and a, b, c, d, 10 and e are deduced from the top to the bottom in sequence from a sector scanning waveform image.
As shown in fig. 4, the ultrasonic probe 11, the water sac device 2 and the composite insulator to be detected are placed in the direction shown in fig. 1, the artificial defect point 101 is located below the core rod 14, gel coupling agent is coated between the ultrasonic probe and the device 2 and between the device 2 and the point to be detected of the composite insulator, the wafer array of the ultrasonic probe 11 is ensured to be consistent with the axial direction of the composite insulator, and the thickness of the water sac is adjusted until the detection result is obtained. And if the detection result is matched with the deduced scanned waveform image, the detection result can be considered to be accurate, and the internal defect condition of the composite insulator can be determined.
Comparing fig. 3 shows that the two figures are matched, the detection result is considered to be accurate, and the defect position is determined to be between d1 and e1, which is consistent with the actual situation.
Example two:
as shown in fig. 9, the water bag device 2 comprises a water bag 12, two water injection ports 21 arranged on the water bag 2, and an ultrasonic wedge 22 arranged in the water bag 12. The water bag is a silicon rubber film 23, and the matrix material of the ultrasonic wedge 22 is polystyrene. Before use, water is injected through the water injection port 21, and the water injection quantity is selected according to the possible positions of the defects of the composite insulator. When the ultrasonic probe is used, the ultrasonic probe 11, the water bag 2 and the composite insulator 15 to be tested are placed as shown in figure 10, gel coupling agents are coated between the ultrasonic probe and the water bag and between the water bag and the point to be tested of the composite insulator, and the wafer array of the ultrasonic probe 11 is ensured to be axially consistent with the composite insulator 15.
Example three:
as shown in fig. 5, after the composite insulator 15 is transversely cut, a defect 101 having a hole diameter of 1.5mm and a depth of about 25mm is artificially produced on the side close to the water pocket.
As shown in fig. 6, before detection, a corresponding detection schematic diagram is formed by the composite insulator structure. a1 is the surface of the water sac, b1 is the upper surface of the sheath, c1 is the upper interface of the sheath and the core rod, d1 is the lower interface of the sheath and the core rod, and e1 is the lower surface of the sheath.
A sector-scan waveform image as shown in fig. 7 was derived. a is water sac surface reflection echo, b is sheath upper surface reflection echo, c is sheath and core rod upper interface reflection echo, d is sheath and core rod lower interface reflection echo, e is sheath lower surface reflection echo, 10 is artificial defect reflection echo, and deducing sector scanning waveform images as a, b, 10, c, d and e from top to bottom.
The ultrasonic probe 11, the water bag 12 and the composite insulator 15 to be detected are placed as shown in fig. 5, the artificial defect 101 is positioned below the core rod 14, gel coupling agents are coated between the ultrasonic probe and the water bag and between the water bag and the point to be detected of the composite insulator, the wafer array of the ultrasonic probe 11 is ensured to be consistent with the composite insulator in the axial direction, and the thickness of the water bag is adjusted until a detection result is obtained, namely fig. 8. As can be seen from comparison of fig. 7, except e, the other reflected echoes are matched with the detection result, and it is presumed that the reason is that most of the ultrasonic waves are reflected back to the probe or lost in the process after passing through the silicone rubber sheath with a large acoustic impedance, the air gap and the glass core rod, so that the echo energy on the lower surface of the sheath is greatly reduced, and thus cannot be obviously detected. Therefore, the detection result is considered to be more accurate, and the defect position is determined to be between b1 and c1, which is consistent with the actual situation.
Example four:
the invention is not limited to the detection of the defects of the composite insulator interface and the core rod, and the devices with the internal structures similar to the composite insulator can be called detection objects, such as a photocurrent transformer (hereinafter referred to as light CT). Fig. 11 is a schematic structural diagram of the optical CT, wherein a photocurrent transformer core rod 31 is disposed inside the photocurrent transformer 3, and the photocurrent transformer core rod 31 is made of epoxy resin and is cylindrical. The photocurrent transformer 3 is externally provided with a flange 32. An ultrasonic phase control detector is used for detecting defects of an optical CT interface and an internal defect, the operation process is as shown in figure 12, gel coupling agents are coated between an ultrasonic probe 11 and a water bag 12 and between the water bag 12 and an optical CT point to be detected 3, the wafer array of the ultrasonic probe 11 is ensured to be consistent with the axial direction of an optical CT core rod, and the thickness of the water bag is adjusted until a detection result is obtained.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (10)
1. An ultrasonic phase control detection model for composite insulator interfaces and internal defects is characterized by comprising a probe and a composite insulator structure to be detected, wherein a water sac device is arranged between the probe and the composite insulator structure to be detected, and the probe is coupled with a point to be detected on the composite insulator structure to be detected through the water sac device to detect; the composite insulator structure to be detected comprises a part to be detected and a core rod in the part to be detected.
2. The ultrasonic phase control detection model for the interface and the internal defect of the composite insulator according to claim 1, wherein the water sac device is a sleeve made of rubber, and the water sac device is sealed after water is injected into the water sac device.
3. The ultrasonic phase control detection model for the composite insulator interface and internal defects as recited in claim 2, wherein gel coupling agent is coated between the probe and the water bag device, and between the water bag device and the point to be measured on the part to be measured.
4. The model for ultrasonic phase-controlled detection of interfacial and internal defects of a composite insulator according to claim 3, wherein the water bladder means comprises a water bladder, a water injection port located on the water bladder, and an ultrasonic wedge located in the water bladder.
5. The model for ultrasonic phase-controlled detection of interfacial and internal defects of a composite insulator according to claim 4, wherein the downward surface of the ultrasonic wedge is arc-shaped.
6. The ultrasonic phase control detection model for the composite insulator interface and internal defects according to claim 5, characterized in that the water sac is a silicon rubber film, and the film material is silicon rubber.
7. The model for ultrasonic phase-controlled detection of interfacial and internal defects of a composite insulator according to claim 6, wherein the ultrasonic wedge material is polystyrene.
8. The model of claim 7, wherein the component to be tested is a composite insulator material.
9. The model for ultrasonic phased detection of composite insulator interfaces and internal defects according to claim 8, wherein the wafer array of probes is axially aligned with the part to be tested.
10. The ultrasonic phase control detection model for the composite insulator interface and internal defects according to claim 9, wherein the matrix material of the core rod is epoxy resin and is cylindrical in shape.
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Application publication date: 20210917 |