CN111257417A - Method for detecting interface defects of extra-high voltage insulating pull rod - Google Patents
Method for detecting interface defects of extra-high voltage insulating pull rod Download PDFInfo
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- CN111257417A CN111257417A CN202010079038.8A CN202010079038A CN111257417A CN 111257417 A CN111257417 A CN 111257417A CN 202010079038 A CN202010079038 A CN 202010079038A CN 111257417 A CN111257417 A CN 111257417A
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- ultrasonic
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- pull rod
- aramid fiber
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- 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
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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
- G01N2291/023—Solids
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- Acoustics & Sound (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- 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 interface defects of an extra-high voltage insulating pull rod. The aramid fiber impregnated epoxy plate and the metal plate are respectively coated between the aramid fiber impregnated epoxy plate and the metal plate with the same material as the insulating railing main body and the matched hardware fitting, so that the aramid fiber impregnated epoxy plate and the metal plate are reliably bonded, and the aramid fiber impregnated epoxy plate and the metal plate are not coated; the PC presents a complete ultrasonic waveform, so that ultrasonic nonlinear parameters can be observed, analyzed and calculated conveniently.
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 defects of an interface of an extra-high voltage insulating pull rod based on ultrasonic nonlinear parameters, which is mainly used for detecting whether the interface of the extra-high voltage insulating pull rod and a matched hardware fitting has defects or not, and improving the use safety of the extra-high voltage insulating pull rod and the stability of an electric power system.
Background
With the rapid development of science and technology, the power technology is also continuously developed and advanced, and the voltage level of a power system is continuously improved. In recent years, with the development demand of high-voltage and high-capacity power transmission of a power system, gas insulated metal enclosed switchgear (GIS) has attracted attention and been widely used because of its advantages of large transmission capacity, small floor space, high reliability, and the like. And the insulating pull rod is a core insulating part for driving the moving contact to move by the transmission operating mechanism in the high-voltage switch. In the operation of products, the insulated pull rod generally bears more than 200 times of opening and breaking fatigue operation tests. The quality of the bonding and fastening quality of the insulating pull rod and the matched hardware fitting directly determines whether the high-voltage electric appliance product can normally operate.
Generally, it is believed that an air gap is generated at an interface when the insulating pull rod is not firmly bonded with a matched hardware tool in the production process or becomes loose in the use process, and when the insulating pull rod is subjected to high voltage, surface flashover may occur at the air gap, so that the reliability of power equipment is reduced.
The ultrasonic concept in the acoustic field is applied to the electric insulation field, and ultrasonic nonlinear parameters are obtained by establishing a contact mechanical model, so that a complete bonding interface and a defect interface can be distinguished. The method can detect whether the bonding between the insulating handrail and the matched hardware fitting is firm or not, has the advantages of simplicity in operation, high resolution and the like, and provides a new method for detecting the interface defects of the insulating pull rod.
Disclosure of Invention
The invention aims to introduce a method for detecting the interface defect of an extra-high voltage insulating pull rod so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for detecting interface defects of an extra-high voltage insulated pull rod is based on a detection device which comprises an ultrasonic instrument, an ultrasonic probe, an oscilloscope, an aramid fiber impregnated epoxy plate, a metal plate, an adhesive and a PC (personal computer), wherein one end of the ultrasonic probe is connected to the ultrasonic instrument, the other end of the ultrasonic probe is arranged on the surface of the aramid fiber impregnated epoxy plate and used for detecting whether the interface between the aramid fiber impregnated epoxy plate and the metal plate is completely bonded by the adhesive, the oscilloscope is connected to a wavefront circuit of the ultrasonic instrument and then transmits ultrasonic waveforms to the PC for observing and analyzing the ultrasonic waveforms and calculating nonlinear parameters, and whether interface defects exist is judged according to the size of the nonlinear parameters.
As a further scheme of the invention: the model of the ultrasonic instrument is cts-23.
As a further scheme of the invention: the model of the ultrasonic probe is 2.5P 20.
As a further scheme of the invention: the oscilloscope is connected to the wavefront circuit of the ultrasound machine to obtain the original propagated waveform of ultrasound carrying the most defect information.
As a further scheme of the invention: the aramid fiber impregnated epoxy plate and the insulating pull rod main body are made of the same material.
As a further scheme of the invention: the metal plate and the insulating pull rod are made of the same material.
As a further scheme of the invention: the adhesive is a silane coupling agent, is partially coated between the aramid fiber impregnated epoxy plate and the metal plate to ensure that the aramid fiber impregnated epoxy plate and the metal plate are reliably bonded, and is not coated to simulate the interface defect between the aramid fiber impregnated epoxy plate and the metal plate.
As a further scheme of the invention: and obtaining an ultrasonic waveform according to the PC, calculating ultrasonic nonlinear parameters, and judging whether interface defects exist according to the ultrasonic nonlinear parameters.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the ultrasonic nonlinear parameters are introduced as detection indexes by establishing a bilinear stiffness model, whether interface defects exist is distinguished according to the obvious difference of ultrasonic nonlinear parameter values of a perfect interface and a defective interface, and the operation reliability of the extra-high voltage insulated pull rod and the safety of a power system are improved.
Drawings
FIG. 1 is a schematic structural diagram of an ultra-high voltage insulation pull rod interface defect detection method based on ultrasonic nonlinear parameters.
FIG. 2 is a graph of values of ultrasonic nonlinearity parameters for a perfect interface and a defect interface.
In the figure: 1-ultrasonic instrument, 2-ultrasonic probe, 3-oscilloscope, 4-aramid fiber impregnated epoxy plate, 5-metal plate, 6-adhesive and 7-PC machine
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.
A method for detecting interface defects of an extra-high voltage insulated pull rod is based on a detection device, as shown in figure 1, the detection device comprises an ultrasonic instrument 1, an ultrasonic probe 2, an oscilloscope 3, an aramid fiber impregnated epoxy plate 4, a metal plate 5, an adhesive 6 and a PC (personal computer) 7, 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 aramid fiber impregnated epoxy plate 4 and used for detecting whether the interface between the aramid fiber impregnated epoxy plate 4 and the metal plate 5 is completely bonded by the adhesive 6, the oscilloscope 3 is connected to a wavefront circuit of the ultrasonic instrument 1 and then transmits ultrasonic waveforms to the PC 7 to observe and analyze ultrasonic waveforms and calculate nonlinear parameters, and whether interface defects exist is judged according to the size of the nonlinear parameter values.
Examples
1) And establishing a bilinear stiffness model of an interface between the insulating pull rod and a matched hardware fitting, and obtaining ultrasonic nonlinear parameters from the bilinear stiffness model.
2) And manufacturing an epoxy glass fiber board which is made of the same material as the insulating pull rod and a metal board which is made of the same material as the fitting matched with the insulating pull rod, coating a silane coupling agent on a part of area between the epoxy glass fiber board and the metal board, and not processing the other part of the area to simulate a complete bonding interface and a defect interface.
3) The sample was placed under a microscope to observe the size of the air gap at the interface.
4) And detecting by using an ultrasonic instrument to obtain an ultrasonic waveform. And then calculating ultrasonic nonlinear parameter values obtained by the bilinear stiffness model, and comparing and distinguishing a perfect bonding interface and a defect interface. FIG. 2 is a graph of values of ultrasonic nonlinearity parameters for a perfect interface and a defect interface.
Claims (2)
1. The method for detecting the interface defects of the extra-high voltage insulated 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), an aramid fiber impregnated epoxy plate (4), a metal plate (5), an adhesive (6) and a PC (personal computer) (7), 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 aramid fiber impregnated epoxy plate (4) and used for detecting whether the interface between the aramid fiber impregnated epoxy plate (4) and the metal plate (5) is completely bonded by the adhesive (6), the oscilloscope (3) is connected to a wavefront circuit of the ultrasonic instrument (1), then the ultrasonic waveform is transmitted to the PC (7) and used for observing and analyzing the ultrasonic waveform and calculating nonlinear parameters, and whether the interface defects exist is judged according to the size of the nonlinear parameters.
2. The method for detecting the defects of the interface of the extra-high voltage insulating pull rod according to claim 1, wherein ultrasonic nonlinear parameter values obtained by a bilinear stiffness model are calculated, and a perfect bonding interface and a defect interface are distinguished by comparison.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010079038.8A CN111257417A (en) | 2020-02-03 | 2020-02-03 | Method for detecting interface defects of extra-high voltage insulating pull rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010079038.8A CN111257417A (en) | 2020-02-03 | 2020-02-03 | Method for detecting interface defects of extra-high voltage insulating pull rod |
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| CN111257417A true CN111257417A (en) | 2020-06-09 |
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| CN202010079038.8A Pending CN111257417A (en) | 2020-02-03 | 2020-02-03 | Method for detecting interface defects of extra-high voltage insulating pull rod |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6302314B1 (en) * | 1998-01-16 | 2001-10-16 | Daido Tokushuko Kabushiki Kaisha | Method for examining bonded-metal by ultrasonic examination |
| CN102426192A (en) * | 2011-09-16 | 2012-04-25 | 北京交通大学 | Method of applying Rayleigh waves in non-linear ultrasonic evaluation of surface damage of metal material |
| CN103278567A (en) * | 2013-05-13 | 2013-09-04 | 北京交通大学 | Ultrasonic nondestructive evaluation of early-stage fatigue damage of bonding interface |
| CN103776902A (en) * | 2014-01-15 | 2014-05-07 | 北京交通大学 | Nonlinear ultrasound evaluating method for impact fatigue damage of metal bonding interface |
| CN104198583A (en) * | 2014-09-09 | 2014-12-10 | 上海交通大学 | Ultrasonic echo measurement method and ultrasonic echo measurement device for debonding defect detection of common-base sandwich member |
| CN107478728A (en) * | 2017-08-15 | 2017-12-15 | 重庆大学 | A kind of lossless detection method of composite insulator |
| 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 |
| CN110455919A (en) * | 2019-08-30 | 2019-11-15 | 河海大学常州校区 | A method of solid solid interface contact performance is evaluated using nonlinear effect |
-
2020
- 2020-02-03 CN CN202010079038.8A patent/CN111257417A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6302314B1 (en) * | 1998-01-16 | 2001-10-16 | Daido Tokushuko Kabushiki Kaisha | Method for examining bonded-metal by ultrasonic examination |
| CN102426192A (en) * | 2011-09-16 | 2012-04-25 | 北京交通大学 | Method of applying Rayleigh waves in non-linear ultrasonic evaluation of surface damage of metal material |
| CN103278567A (en) * | 2013-05-13 | 2013-09-04 | 北京交通大学 | Ultrasonic nondestructive evaluation of early-stage fatigue damage of bonding interface |
| CN103776902A (en) * | 2014-01-15 | 2014-05-07 | 北京交通大学 | Nonlinear ultrasound evaluating method for impact fatigue damage of metal bonding interface |
| CN104198583A (en) * | 2014-09-09 | 2014-12-10 | 上海交通大学 | Ultrasonic echo measurement method and ultrasonic echo measurement device for debonding defect detection of common-base sandwich member |
| CN107478728A (en) * | 2017-08-15 | 2017-12-15 | 重庆大学 | A kind of lossless detection method of composite insulator |
| 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 |
| CN110455919A (en) * | 2019-08-30 | 2019-11-15 | 河海大学常州校区 | A method of solid solid interface contact performance is evaluated using nonlinear effect |
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