CN111257416A - Method for detecting internal defects of extra-high voltage insulating pull rod - Google Patents
Method for detecting internal defects of extra-high voltage insulating pull rod Download PDFInfo
- Publication number
- CN111257416A CN111257416A CN202010079035.4A CN202010079035A CN111257416A CN 111257416 A CN111257416 A CN 111257416A CN 202010079035 A CN202010079035 A CN 202010079035A CN 111257416 A CN111257416 A CN 111257416A
- Authority
- CN
- China
- Prior art keywords
- defect
- ultrasonic
- pull rod
- wave
- defects
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- G01N29/048—Marking the faulty objects
-
- 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
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
-
- 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
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
-
- 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
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
-
- 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
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/015—Attenuation, scattering
-
- 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
- G01N2291/023—Solids
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention relates to the field of detection of insulating materials in high-voltage equipment, and discloses a method for detecting internal defects of an extra-high voltage insulating pull rod. The oscilloscope is connected with the ultrasonic instrument so as to obtain an ultrasonic original propagation waveform carrying the most defect information; the coupling agent is water; the detection sample is an aramid fiber impregnated epoxy resin plate made of the same material as the insulating pull rod; the PC presents a complete ultrasonic waveform, so that observation and analysis are facilitated, an ultrasonic detection system is built for detecting the insulated pull rod through the reflection phenomenon when the ultrasonic wave is transmitted in the solid and meets the defects, the positions and the sizes of the defects and the defects are determined according to the defect-free reflected wave and the transmission time and the amplitude of the defect-free reflected wave, and the operation reliability of the power equipment and the safety of the power system are improved.
Description
Technical Field
The invention belongs to the field of detection of insulating materials in high-voltage equipment, and relates to a method for detecting internal defects of an extra-high voltage insulating pull rod, which is mainly applied to timely discovery of the internal defects of the extra-high voltage insulating pull rod and avoids accidents.
Background
Electric power is the most important technical foundation for social development and urban transformation, and with the rapid development of economy in China, the automatic construction and modification of electric power industries, power supply enterprises and power utilization enterprises are continuously developed and perfected. In recent years, with the development demand of high-voltage and large-capacity power transmission of power systems, the voltage level of power equipment is continuously improved, and people put more severe requirements on the safe operation of the power equipment. The extra-high voltage insulation pull rod is an important component of the high-voltage circuit breaker and is a connecting piece between a high potential of the high-voltage circuit breaker and a working mechanism. The insulating pull rod is an insulating tool for operating live equipment in a short time, such as turning on or off a high-voltage isolating switch, dropping a fuse, assembling and disassembling a portable grounding wire, and performing measurement and test. However, the insulating tie rod also has defects during the manufacturing and use processes.
Generally, it is believed that, in the production process or under the action of long-term severe environment and mechanical stress, defects such as micropores and cracks may occur inside the insulated pull rod, and surface flashover and even breakdown may occur under the action of high voltage, which seriously reduces the reliability of the power equipment.
The ultrasonic wave in the acoustic field is applied to the electric insulation field, and the internal defect of the insulation pull rod is detected by utilizing the reflection phenomenon when the ultrasonic wave is transmitted in a solid and meets the defect. The method has the advantages of simple operation, easy control and the like, and provides a new method for detecting the micropore defect of the extra-high voltage insulating pull rod.
Disclosure of Invention
The invention aims to provide a method for detecting internal defects of an extra-high voltage insulating pull rod, which is used for detecting the internal defects of the extra-high voltage insulating pull rod.
In order to achieve the purpose, the invention provides the following technical scheme: a method for detecting defects in an ultra-high voltage insulation pull rod is based on the detection device and comprises an ultrasonic instrument (1), an ultrasonic probe (2), an oscilloscope (3), a coupling agent (4), a detection sample (5) and a PC (6), wherein one end of the ultrasonic probe (2) is connected to the ultrasonic instrument (1), the other end of the ultrasonic probe is arranged on the surface of the detection sample (5) through the coupling agent (4), the oscilloscope (3) is connected to a wavefront circuit of the ultrasonic instrument (1), then the ultrasonic waveform is transmitted to the PC (6) to observe and analyze the ultrasonic waveform, and the position and the size of the defects can be judged by the PC (6) according to propagation time and amplitude of a defect reflected wave in the ultrasonic waveform.
The invention coats couplant-water on the surface of the sample, and then uses the probe to detect the defects in the sample through the couplant.
Firstly, placing a probe in a defect-free area, and calibrating an initial wave and a bottom reflected wave displayed in an oscilloscope; then the probe is slowly moved, and when a defect reflected wave appears between the initial wave and the bottom wave, the defect exists.
The invention analyzes the defect reflected wave: the position of the defect is gradually deepened along with the time of the defect ultrasonic reflection wave, the amplitude of the defect ultrasonic reflection wave is increased along with the increase of the size of the defect, and the position and the size of the defect are judged according to the time and the amplitude of the defect reflection wave.
Compared with the prior art, the invention has the beneficial effects that: the reflection phenomenon of the ultrasonic wave when the ultrasonic wave is transmitted in the solid and meets the defect can be used for obtaining the ultrasonic reflected wave with no defect in the insulating pull rod, and the position and the size of the defect can be judged according to the time and the amplitude of the defect reflected wave, so that the operation reliability of the extra-high voltage insulating pull rod and the safety of a power system are improved. The oscilloscope is connected to the wavefront circuit of the ultrasound machine in order to obtain the original propagated waveform of ultrasound carrying the most defect information.
Drawings
FIG. 1 is a schematic diagram of detecting internal defects of an extra-high voltage insulated pull rod by an ultrasonic reflection method.
Fig. 2 is a model of the propagation of ultrasonic waves in epoxy composite insulation.
FIG. 3 is an ultrasonic waveform without defects and with internal defects.
In the figure: 1-ultrasonic instrument, 2-ultrasonic probe, 3-oscilloscope, 4-couplant, 5-test sample and 6-PC.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The detection device based on the invention is shown in figure 1 and comprises an ultrasonic instrument 1, an ultrasonic probe 2, an oscilloscope 3, a couplant 4, a detection sample 5 and a PC 6, wherein one end of the ultrasonic probe 2 is connected to the ultrasonic instrument 1, the other end of the ultrasonic probe is arranged on the surface of the detection sample 5 through the couplant 4, the oscilloscope 3 is connected to a wavefront circuit of the ultrasonic instrument 1 and then transmits an ultrasonic waveform to the PC 6 for observing and analyzing the ultrasonic waveform, and the PC 6 can judge the position and the size of a defect by obtaining the propagation time and the amplitude of a defect reflected wave in the ultrasonic waveform.
Examples
1) An epoxy resin impregnated aramid fiber board which is made of the same material as the insulating pull rod is manufactured and placed on the punching machine, and holes with different diameters and different depths are punched from the bottom and the side face of the punching machine to simulate micro holes and crack defects. From the perspective of ultrasonic wave propagation, the solid epoxy-air hole air interface at the top of the artificial air hole is acoustically equivalent to the epoxy-air hole interface at the micro hole in the epoxy material, and the solid epoxy-air interface at the side of the air hole is equivalent to the epoxy-air interface at the strip crack in the epoxy material.
2) And smearing couplant-water on the surface of the sample to reduce the attenuation of ultrasonic waves, and then detecting defects in the sample by using a probe through the couplant. Firstly, placing a probe in a defect-free area, and calibrating an initial wave and a bottom reflected wave displayed in an oscilloscope; then the probe is slowly moved, and when a defect reflected wave appears between the initial wave and the bottom wave, the defect exists.
3) And analyzing the defect reflected wave. The position of the defect is gradually deepened along with the time of the appearance of the defect ultrasonic reflection wave, and the amplitude of the defect ultrasonic reflection wave is increased along with the increase of the size of the defect, so that the position and the size of the defect are judged according to the time and the amplitude of the appearance of the defect reflection wave. Fig. 2 is a model of the propagation of ultrasonic waves in epoxy composite insulation. FIG. 3 is an ultrasonic waveform without defects and with internal defects.
Claims (4)
1. The method for detecting the defects in the ultra-high voltage insulation pull rod is characterized in that a detection device based on the method comprises an ultrasonic instrument (1), an ultrasonic probe (2), an oscilloscope (3), a coupling agent (4), a detection sample (5) and a PC (6), wherein one end of the ultrasonic probe (2) is connected to the ultrasonic instrument (1), the other end of the ultrasonic probe is arranged on the surface of the detection sample (5) through the coupling agent (4), the oscilloscope (3) is connected to a wave front circuit of the ultrasonic instrument (1), then the ultrasonic waveform is transmitted to the PC (6) to observe and analyze the ultrasonic waveform, and the PC (6) obtains propagation time and amplitude of a defect reflected wave in the ultrasonic waveform to judge the position and the size of the defect.
2. The method for detecting the internal defects of the extra-high voltage insulating pull rod according to claim 1, wherein a couplant-water is coated on the surface of the sample, and then a probe is used for detecting the defects in the sample through the couplant.
3. The method for detecting the internal defects of the extra-high voltage insulating pull rod according to claim 1, wherein a probe is placed in a defect-free area, and an initial wave and a bottom surface reflected wave displayed in an oscilloscope are calibrated; then the probe is slowly moved, and when a defect reflected wave appears between the initial wave and the bottom wave, the defect exists.
4. The method for detecting the internal defect of the extra-high voltage insulating pull rod according to claim 1, wherein a defect reflected wave is analyzed: the position of the defect is gradually deepened along with the time of the defect ultrasonic reflection wave, the amplitude of the defect ultrasonic reflection wave is increased along with the increase of the size of the defect, and the position and the size of the defect are judged according to the time and the amplitude of the defect reflection wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010079035.4A CN111257416A (en) | 2020-02-03 | 2020-02-03 | Method for detecting internal defects of extra-high voltage insulating pull rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010079035.4A CN111257416A (en) | 2020-02-03 | 2020-02-03 | Method for detecting internal defects of extra-high voltage insulating pull rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111257416A true CN111257416A (en) | 2020-06-09 |
Family
ID=70954654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010079035.4A Pending CN111257416A (en) | 2020-02-03 | 2020-02-03 | Method for detecting internal defects of extra-high voltage insulating pull rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111257416A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402014A (en) * | 2002-09-13 | 2003-03-12 | 西安交通大学 | Ultrasonic reflection detecting device and mehtod for diagnosis of insulation state of stator for large electric generator |
| US20090105967A1 (en) * | 2006-03-24 | 2009-04-23 | Hiroaki Hatanaka | Defect inspection apparatus and defect inspection method |
| CN105973992A (en) * | 2016-06-06 | 2016-09-28 | 平高集团有限公司 | Tiny pore defect ultrasonic-wavelet detection method for epoxy casting insulator |
| CN106053603A (en) * | 2016-06-06 | 2016-10-26 | 平高集团有限公司 | Ultrasonic time-domain detection method for pore defect of epoxy casting insulation part |
| CN110243935A (en) * | 2019-06-13 | 2019-09-17 | 华南理工大学 | A kind of GIS epoxy insulation internal flaw ultrasonic detection method and system |
-
2020
- 2020-02-03 CN CN202010079035.4A patent/CN111257416A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402014A (en) * | 2002-09-13 | 2003-03-12 | 西安交通大学 | Ultrasonic reflection detecting device and mehtod for diagnosis of insulation state of stator for large electric generator |
| US20090105967A1 (en) * | 2006-03-24 | 2009-04-23 | Hiroaki Hatanaka | Defect inspection apparatus and defect inspection method |
| CN105973992A (en) * | 2016-06-06 | 2016-09-28 | 平高集团有限公司 | Tiny pore defect ultrasonic-wavelet detection method for epoxy casting insulator |
| CN106053603A (en) * | 2016-06-06 | 2016-10-26 | 平高集团有限公司 | Ultrasonic time-domain detection method for pore defect of epoxy casting insulation part |
| CN110243935A (en) * | 2019-06-13 | 2019-09-17 | 华南理工大学 | A kind of GIS epoxy insulation internal flaw ultrasonic detection method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103197212B (en) | GIS partial discharge on-line monitoring tester and configuration verification method thereof | |
| CN100573134C (en) | A kind of pillar porcelain insulator and porcelain bushing ultrasonic wave detection method | |
| CN101907607A (en) | Method for detecting defect of porcelain strut insulator | |
| CN110243935A (en) | A kind of GIS epoxy insulation internal flaw ultrasonic detection method and system | |
| CN104458910B (en) | Nondestructive testing method for bonding defects of shell of wind turbine blade and web plate | |
| CN111856224A (en) | Partial discharge multi-source fusion detection system and method for high-voltage switch cabinet | |
| CN107238610B (en) | Composite insulator defect nondestructive testing system based on microwave band reflection characteristic | |
| CN203455389U (en) | Simulation test stand for power transmission line insulator leakage current | |
| CN106645404B (en) | High-tension switch gear disc insulator curing degree lossless detection method and device | |
| CN106248799A (en) | A kind of method using vibratory drilling method detection column support type porcelain bottle insulators damage | |
| CN104375068A (en) | Visual ultrasonic quick inspection device used for power transmission and distribution line patrolling | |
| CN111257418A (en) | Internal defect detection device for extra-high voltage insulation pull rod | |
| CN111257416A (en) | Method for detecting internal defects of extra-high voltage insulating pull rod | |
| WO2024098825A1 (en) | Method and apparatus for analyzing oil paper insulation cavity defect under effect of harmonics | |
| CN105973992A (en) | Tiny pore defect ultrasonic-wavelet detection method for epoxy casting insulator | |
| CN205175640U (en) | Analogue test device of GIS vibration signal characteristic | |
| CN108593775A (en) | A kind of non-linear ultrasonic guided wave detecting method for contacting state evaluation between conductor casing | |
| CN207232374U (en) | A kind of shelf depreciation ultrasound detection sensor calibrating system based on shear wave technique | |
| Xue et al. | Defect Detection and Recognition of Insulation Pull Rod Based on the Ultrasonic Method | |
| Chen et al. | Application of on-line ultrasonic and UHF partial discharge detection in 1000kV GIS | |
| CN204287392U (en) | For the visual ultrasonic fast inspection device that electric line is maked an inspection tour | |
| CN111257419A (en) | Extra-high voltage insulation pull rod interface defect detection device | |
| CN112179297A (en) | Composite insulator sheath core displacement detection method based on microwave reflection technology | |
| CN111257417A (en) | Method for detecting interface defects of extra-high voltage insulating pull rod | |
| CN205301560U (en) | On --spot put quick detection device of appearance with ultrasonic wave office |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200609 |