CN110320272A - A kind of detection method of three support insulators center conductor and epoxy part faying face - Google Patents
A kind of detection method of three support insulators center conductor and epoxy part faying face Download PDFInfo
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- CN110320272A CN110320272A CN201910521036.7A CN201910521036A CN110320272A CN 110320272 A CN110320272 A CN 110320272A CN 201910521036 A CN201910521036 A CN 201910521036A CN 110320272 A CN110320272 A CN 110320272A
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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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2437—Piezoelectric probes
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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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4454—Signal recognition, e.g. specific values or portions, signal events, signatures
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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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- 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
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0421—Longitudinal waves
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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
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
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Abstract
The invention discloses the detection method of a kind of three support insulator center conductors and epoxy part faying face, comprising steps of S1, building ultrasonic testing system；S2, ultrasonic testing system detect standard component；S3, ultrasonic testing system detect three support insulators；In S4, detection process, reflection echo peak value on recording oscillometer judges the center conductor of inspection positions with epoxy part faying face with the presence or absence of gap.The present invention has many advantages, such as that testing cost is low, detection accuracy is high, is convenient for carrying and radiationless to human body, can be used in the erecting yard detection that also can be used in tri- support insulator of GIL while tri- support insulator factory testing of GIL.
Description
Technical field
The present invention relates to power transmission and transformation insulator arrangement fields, more particularly to a kind of three support insulator center conductors and epoxy part
The detection method of faying face.
Background technique
Three support insulators are the important electric components in gas-insulated metal closed power transmission line (GIL), are mainly used
In the internal electrical conductor of support, while high-pressure conductor part is dielectrically separated from low pressure housing portion.Three support insulator performances
Quality directly affect whether GIL can run to long time stability.Three support insulators in process of production, if casting
Process Quality Control is bad, and the epoxy part and center conductor faying face of insulator will appear gap, in conjunction with the defects of not close, this
It can make interior insulator non-uniform electric in actual application, insulator shelf depreciation, insulator is caused to be sent out extremely
Phenomena such as hot, accelerates the Ageing of Insulators, declines Insulators Used, directly threatens the normal operation of GIL.Therefore, early really
Three support insulator epoxy parts and center conductor faying face are recognized with the presence or absence of gap, and there is weight to guarantee safe operation of power system
Want meaning.
Currently, the defects detection of three support insulators of GIL occurs generally to use industrial digital in the delivery test stage
Change x-ray imaging technology, which is that detection accuracy, detection efficiency are higher, the disadvantage is that industrial X-ray Imaging machine price
Expensive, X-ray radiation endangers personal safety, can not isolator detecting to erecting yard process etc..
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of three support insulator center conductors and epoxies
The detection method of part faying face.The invention belongs to ultrasonic longitudinal wave reflection detection method, testing cost is low, detection accuracy is high, conveniently
It carries, to the radiationless harm of human body, the factory testing that can be used for three support insulators is equally applicable to the dress of three support insulators
With on-site test.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of detection method of three support insulators center conductor and epoxy part faying face, comprising steps of
S1, ultrasonic testing system is built；
S2, ultrasonic testing system detect standard component；
S3, ultrasonic testing system detect three support insulators；
In S4, detection process, reflection echo peak value on recording oscillometer, to the center conductor and epoxy part of inspection positions
Faying face is judged with the presence or absence of gap.
The specific building method of ultrasonic testing system: narrow strip longitudinal wave ultrasonic probe is sent out by probe connecting line and ultrasonic pulse
The issuing side of raw receiving instrument is connected, and the synchronization end that receiving instrument occurs for ultrasonic pulse is connected by signal transmssion line with oscillograph
It connects.
Specifically, to standard component detection method are as follows: starting ultrasonic testing system adjusts ultrasonic pulse and receiving instrument occurs, will
Narrow strip longitudinal wave ultrasonic probe is placed on the metal layer of standard component, recording oscillometer echo-signal peak amplitude.
Specifically, to three support insulator detection methods are as follows: narrow strip longitudinal wave ultrasonic probe is placed on three support insulators
Center conductor inner wall on, start ultrasonic testing system, narrow strip longitudinal wave ultrasonic probe is done into tangent circle along center conductor inner wall
Zhou Yundong, displacement complete the detection to current circumference faying face after a week, then will pop one's head in along the central axial shifting of center conductor
A probe base length is moved, new circumference detection is done, until the displacement of probe covers entire center conductor inner wall.
Specifically, in order to increase coupling effect, a little machine oil or transformer oil are smeared in probe bottom surface.
Specifically, the gap judgment method are as follows: if the reflection echo peak value in center conductor inner wall somewhere is greater than standard
When the reflection echo peak value of part detection, then it may indicate that the center conductor of the inspection positions and epoxy part faying face exist and stitch
Gap.
Specifically, the standard component is by the epoxy layer and gold of material identical as three support insulators, identical manufacture craft
Belong to layer composition, the epoxy layer and metal layer interface of standard component do not have gap, are well combined, and metal layer thickness and three pillars are exhausted
The center conductor thickness of edge is identical, and the reflection echo peak value obtained by ultrasonic testing system examination criteria part can be used as
Reflection echo peak value when three support insulator center conductors and epoxy part faying face are seamless.
Specifically, the detection method of a kind of three support insulators center conductor and epoxy part faying face utilizes ultrasound detection system
System detects three support insulator center conductors and epoxy part faying face, and the ultrasonic testing system includes ultrasonic pulse hair
Raw receiving instrument, oscillograph, narrow strip longitudinal wave ultrasonic probe, probe connecting line and signal transmssion line.
Further, it is losing side wave excitation, square wave amplitude and broad-adjustable tool that receiving instrument, which occurs, for the ultrasonic pulse
There is a pulse generation receiver of low noise acoustic response, adjustable gain, transmit circuit is by high-performance square wave impulse generator and advanced
High-tension circuit composition, receive circuit have extremely low noise and broad frequency band, ensure that ultrasound generation, receive signal high quality
Property.
Further, the oscillograph is that bandwidth is up to 200MHz, maximum sampling rate 1GS/s, high input impedance
Receiving instrument is occurred for oscillograph input channel and ultrasonic pulse by signal transmssion line by four-way good digital storage oscillograph
Signal output end is connected with current potential, the ultrasonic signal that real-time display receives on oscillograph.
The narrow strip longitudinal wave ultrasonic probe belongs to longitudinal wave piezo-electric type contact normal probe, using rectangle composite material piezoelectricity
Chip, probe bottom surface are planar rectangular；In view of insulator center conductor is cirque structure, inner wall is arc surface, in order to mention
High measurement accuracy, probe designs are narrow strip.
The probe connecting line is the signal wire for matching ultrasonic pulse and receiving instrument and narrow strip longitudinal wave ultrasonic probe occurring, tool
Have the features such as low noise, strong antijamming capability, guarantee ultrasonic pulse occur receiving instrument output electric signal can in high quality by
Narrow strip longitudinal wave ultrasonic probe receives, meanwhile, guarantee that narrow strip longitudinal wave ultrasonic probe receives the telecommunications that ultrasonic signal is converted into
The receiving end of receiving instrument occurs back to ultrasonic pulse number in high quality.
The signal wire transmission line is that stray inductance is smaller, the lesser transmission line of resistance, shortens high-frequency signal and is transmitting
Phase delay in the process guarantees the electric signal for the electric signal and ultrasonic pulse generation receiving instrument signal output end that oscillograph receives
Real-time same current potential, same-phase, greatly reduce detection error, ensure that detection accuracy.
The narrow strip longitudinal wave ultrasonic probe uses plane wave normal probe, and probe bottom width (W) is smaller, narrow strip longitudinal wave
Ultrasonic probe and center conductor inner wall contact quality are higher, and clutter is fewer in detection process；Comprehensively consider manufacture craft, cost and
Center conductor inner wall curvature, probe bottom width (W) scope of design take 5-10mm, and probe base length (L) scope of design takes 20-
35mm, probe height (H) scope of design take 15-20mm.
The frequency of the narrow strip longitudinal wave ultrasonic probe is higher, and the attenuation coefficient for being detected material is bigger, and acoustic beam propagation is special
Property effect it is poorer, in conjunction with actual measurement experience, the Frequency Design of narrow strip longitudinal wave ultrasonic probe is not more than 2.5MHz.
The applicable object of the ultrasonic testing system is three support insulators, and three support insulators are to include epoxy part in
Heart conductor；The epoxy part includes three cylinders；Center conductor is the annular structure of aluminium material, the thickness and ruler of center conductor
It is very little to change and variation with GIL voltage class.
The present invention compared to the prior art, have it is below the utility model has the advantages that
1, the present invention can judge three support insulator center conductors and epoxy part knot by comparing reflection echo peak value
Conjunction face whether there is gap.The present invention has that testing cost is low, detection accuracy is high, is convenient for carrying and radiationless etc. excellent to human body
Point also can be used in the erecting yard detection of three support insulators while can be used in three support insulator factory testings.
Detailed description of the invention
Fig. 1 is the detecting system schematic diagram of a kind of three support insulator center conductors and epoxy part faying face；
Fig. 2 is narrow strip longitudinal wave structure of ultrasonic schematic diagram in the present embodiment: where (a) is narrow strip longitudinal wave ultrasound
Probe main view (b) is narrow strip longitudinal wave ultrasonic probe side view, (c) is narrow strip longitudinal wave ultrasonic probe schematic bottom view；
Fig. 3 is narrow strip longitudinal wave ultrasonic probe movement routine schematic diagram in the present embodiment；
Fig. 4 is ultrasonic testing system examination criteria part schematic diagram in the present embodiment；
Fig. 5 is a kind of detection method operation step of three support insulator center conductors and epoxy part faying face in the present embodiment
Rapid schematic diagram.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
In the present embodiment, as shown in Figure 1, the ultrasonic testing system includes that receiving instrument (1), oscillography occur for ultrasonic pulse
Device (2), narrow strip longitudinal wave ultrasonic probe (3), probe connecting line (4) and signal transmssion line (5), the system detection object is three
Support insulator (6).
Narrow strip longitudinal wave ultrasonic probe is connected by probe connecting line with the issuing side that receiving instrument occurs for ultrasonic pulse, is shown
Wave device is connected by signal transmssion line with the synchronous end that receiving instrument occurs for ultrasonic pulse.
Three support insulators (6) include epoxy part (61) and center conductor (62)；Epoxy part includes three cylinders；It leads at center
Body is the annular structure of aluminium material, and the thickness of center conductor, size change with GIL voltage class and changed.
Narrow strip longitudinal wave structure of ultrasonic schematic diagram as shown in Figure 2, the narrow strip longitudinal wave ultrasonic probe (3) are longitudinal wave
Piezo-electric type contact normal probe.In view of insulator center conductor (62) are cirque structure, inner wall is arc surface, in order to improve
Detection accuracy, probe designs are narrow strip；Piezoelectric chip (31) uses rectangle composite material, and probe bottom surface (32) is plane square
Shape.
The narrow strip longitudinal wave ultrasonic probe uses plane wave normal probe, and probe bottom width (W) is smaller, narrow strip longitudinal wave
Ultrasonic probe and center conductor inner wall contact quality are higher, and clutter is fewer in detection process；Comprehensively consider manufacture craft, cost and
Center conductor inner wall curvature, in the present embodiment, probe bottom width (W) scope of design take 5-10mm, pop one's head in base length (L)
Scope of design takes 20-35mm, and probe height (H) scope of design takes 15-20mm.
The frequency of the narrow strip longitudinal wave ultrasonic probe is higher, and the attenuation coefficient for being detected material is bigger, and acoustic beam propagation is special
Property effect it is poorer, in conjunction with actual measurement experience, the Frequency Design of narrow strip longitudinal wave ultrasonic probe is not more than 2.5MHz.
As shown in figure 3, narrow strip longitudinal wave is surpassed when ultrasonic testing system starts the detection of three support insulators (6)
Sonic probe is placed on the center conductor inner wall of three support insulators, and in order to increase coupling effect, a little machine is smeared in probe bottom surface
Oil or transformer oil；The ultrasonic wave that narrow strip longitudinal wave ultrasonic probe issues impinges perpendicularly in center conductor, travels to later
Heart conductor and epoxy part faying face, when center conductor and epoxy part faying face are there are when gap, ultrasonic reflections are reinforced, transmission subtracts
It is weak, the reflection echo that narrow strip longitudinal wave ultrasonic probe receives than it is seamless when it is more, the echo-peak of oscilloscope display becomes larger.
In the detection process of this implementation, ignore influence of the center conductor surface roughness to ultrasonic acoustic beam propagation characteristic.
As shown in figure 3, in detection process of the ultrasonic testing system to three support insulators, the narrow strip longitudinal wave ultrasound
First to do tangential (tangential) circular motion along center conductor inner wall, displacement is completion pair after a week in the detection path of probe
The detection of current circumference faying face；Then, by narrow strip longitudinal wave ultrasonic probe along center conductor central axial (axial) mobile one
A probe base length does new circumference detection, until the displacement of narrow strip longitudinal wave ultrasonic probe covers in entire center conductor
Until wall surface.
The defect evaluation method refers to three support insulator epoxy parts, and there are the judge sides in gap with center conductor faying face
Method: obtaining the reflection echo peak value size of standard component first, i.e., is obtained and be reflected back to standard component detection using ultrasonic testing system
Then crest value carries out ultrasound detection to three support insulators and center conductor faying face according to above-mentioned detection method, if
When the reflection echo peak value of center conductor inner wall somewhere detection is greater than the reflection echo peak value of standard component, then it may indicate that the detection
There are gaps with center conductor faying face for epoxy part at position.
The standard component (7) is by the epoxy layer (72) and gold of material identical as three support insulators, identical manufacture craft
Belong to layer (71) composition, as shown in figure 4, the epoxy layer of standard component and metal layer faying face do not have gap, are well combined, and metal layer
Thickness is identical as the center conductor thickness of three support insulators, the reflection echo obtained by ultrasonic testing system examination criteria part
Peak value can be used as reflection echo peak value when three support insulator center conductors and seamless epoxy part faying face.
It is illustrated in figure 5 the detection method flow chart of a kind of three support insulator center conductors and epoxy part faying face, institute
State method comprising steps of
S1, ultrasonic testing system is built；
The specific building method of ultrasonic testing system: narrow strip longitudinal wave ultrasonic probe is sent out by probe connecting line and ultrasonic pulse
The issuing side of raw receiving instrument is connected, and the synchronization end that receiving instrument occurs for ultrasonic pulse is connected by signal transmssion line with oscillograph
It connects；
S2, ultrasonic testing system detect standard component；
Specifically, to standard component detection method are as follows: starting ultrasonic testing system adjusts ultrasonic pulse and receiving instrument occurs, will
The narrow strip longitudinal wave ultrasonic probe for smearing a little machine oil or transformer oil is placed on the metal layer of standard component, recording oscillometer echo
Signal peak amplitude；
S3, ultrasonic testing system detect tri- support insulator of GIL；
Specifically, to tri- support insulator detection method of GIL are as follows: indulge the narrow strip for smearing a little machine oil or transformer oil
Wave ultrasonic probe is placed on the center conductor inner wall of tri- support insulator of GIL, starts ultrasonic testing system, narrow strip longitudinal wave is surpassed
Sonic probe does tangential circular motion along center conductor inner wall, and the detection to current circumference faying face is completed in displacement after a week, so
Probe is moved into a probe base length along center conductor is central axial afterwards, new circumference is done and detects, until the displacement of probe
Until covering entire center conductor inner wall；
In S4, detection process, reflection echo peak value on recording oscillometer, to the center conductor and epoxy part of inspection positions
Faying face is judged with the presence or absence of gap.
Specifically, the judgment method are as follows: if the reflection echo peak value in center conductor inner wall somewhere is examined greater than standard component
When the reflection echo peak value of survey, then may indicate that the center conductors of the inspection positions, there are gaps with epoxy part faying face.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of detection method of three support insulator center conductors and epoxy part faying face, which is characterized in that comprising steps of
S1, ultrasonic testing system is built；
S2, ultrasonic testing system detect standard component；
S3, ultrasonic testing system detect three support insulators；
In S4, detection process, reflection echo peak value on recording oscillometer, to the center conductors of inspection positions in conjunction with epoxy part
Face is judged with the presence or absence of gap.
2. the detection method of a kind of three support insulators center conductor and epoxy part faying face according to claim 1,
It is characterized in that, the ultrasonic testing system includes that ultrasonic pulse occurs receiving instrument, oscillograph, narrow strip longitudinal wave ultrasonic probe, visits
Head connecting line and signal transmssion line；
Narrow strip longitudinal wave ultrasonic probe is connected by probe connecting line with the issuing side that receiving instrument occurs for ultrasonic pulse, ultrasonic arteries and veins
The synchronization end that receiving instrument occurs for punching is connected by signal transmssion line with oscillograph.
3. the detection method of a kind of three support insulators center conductor and epoxy part faying face according to claim 1,
It is characterized in that, to standard component detection method are as follows: starting ultrasonic testing system adjusts ultrasonic pulse and receiving instrument occurs, by narrow strip
Longitudinal wave ultrasonic probe is placed on the metal layer of standard component, recording oscillometer echo-signal peak amplitude.
4. the detection method of a kind of three support insulators center conductor and epoxy part faying face according to claim 1,
It is characterized in that, to three support insulator detection methods are as follows: narrow strip longitudinal wave ultrasonic probe is placed on to the center of three support insulators
On conductor inner wall, starts ultrasonic testing system, narrow strip longitudinal wave ultrasonic probe is done into tangential circular motion along center conductor inner wall,
Detection to current circumference faying face is completed in displacement after a week, and probe is then moved a spy along center conductor is central axial
Head base length does new circumference detection, until the displacement of probe covers entire center conductor inner wall.
5. according to the detection method of one kind three support insulator center conductors and epoxy part faying face described in claim 3 and 4,
It is characterized in that, in order to increase coupling effect, a little machine oil or transformer oil are smeared in probe bottom surface.
6. the detection method of a kind of three support insulators center conductor and epoxy part faying face according to claim 1,
It is characterized in that, the gap judgment method are as follows: if the reflection echo peak value in center conductor inner wall somewhere is detected greater than standard component
Reflection echo peak value when, then showing the center conductors of the inspection positions, there are gaps with epoxy part faying face.
7. the detection method of a kind of three support insulators center conductor and epoxy part faying face according to claim 2,
It is characterized in that, receiving instrument, which occurs, for the ultrasonic pulse is losing side wave excitation, square wave amplitude and broad-adjustable has the low noise sound
It answers, the pulse generation receiver of adjustable gain.
8. the detection method of a kind of three support insulators center conductor and epoxy part faying face according to claim 2,
Be characterized in that, the oscillograph be bandwidth be 200MHz, maximum sample rate is 1GS/s, the four-way high-performance of high input impedance
Digital storage oscilloscope.
9. the detection method of a kind of three support insulators center conductor and epoxy part faying face according to claim 2,
It is characterized in that, the narrow strip longitudinal wave ultrasonic probe belongs to longitudinal wave piezo-electric type contact normal probe, using rectangle composite material pressure
Electric chip, probe bottom surface are planar rectangular；Probe designs are narrow strip.
10. the detection method of a kind of three support insulators center conductor and epoxy part faying face according to claim 9,
It being characterized in that, the narrow strip longitudinal wave ultrasonic probe uses plane wave normal probe, and probe bottom width scope of design is 5-10mm,
Probe base length scope of design is 20-35mm, and probe height scope of design is 15-20mm；Narrow strip longitudinal wave ultrasonic probe
Frequency Design is not more than 2.5MHz.
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| CN201910521036.7A CN110320272B (en) | 2019-06-17 | 2019-06-17 | Method for detecting junction surface of central conductor and epoxy piece of three-post insulator |
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| CN201910521036.7A CN110320272B (en) | 2019-06-17 | 2019-06-17 | Method for detecting junction surface of central conductor and epoxy piece of three-post insulator |
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| CN111426412A (en) * | 2020-04-26 | 2020-07-17 | 华南理工大学 | Annular stress sensing device suitable for GI L three-post insulator and detection method |
| CN112034040A (en) * | 2020-08-12 | 2020-12-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Defect detection method, device and system for column base of three-column insulator |
| CN112066920A (en) * | 2020-08-31 | 2020-12-11 | 南方电网科学研究院有限责任公司 | Method and device for detecting strain of three-post insulator column foot and medium |
| CN112630611A (en) * | 2020-12-14 | 2021-04-09 | 华南理工大学 | Test method for detecting uniformity of basin-type insulator by ultrasonic longitudinal wave reflection method |
| CN113310610A (en) * | 2020-12-31 | 2021-08-27 | 华南理工大学 | Ultrasonic detection method for peripheral epoxy stress of three-post insulator insert |
| CN113639912A (en) * | 2021-07-30 | 2021-11-12 | 华南理工大学 | Method, device and system for detecting column leg stress under radial load of three-column insulator |
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| CN112034040A (en) * | 2020-08-12 | 2020-12-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Defect detection method, device and system for column base of three-column insulator |
| CN112066920A (en) * | 2020-08-31 | 2020-12-11 | 南方电网科学研究院有限责任公司 | Method and device for detecting strain of three-post insulator column foot and medium |
| CN112630611A (en) * | 2020-12-14 | 2021-04-09 | 华南理工大学 | Test method for detecting uniformity of basin-type insulator by ultrasonic longitudinal wave reflection method |
| CN112630611B (en) * | 2020-12-14 | 2022-04-22 | 华南理工大学 | Test method for detecting uniformity of basin-type insulator by ultrasonic longitudinal wave reflection method |
| CN113310610A (en) * | 2020-12-31 | 2021-08-27 | 华南理工大学 | Ultrasonic detection method for peripheral epoxy stress of three-post insulator insert |
| CN113639912A (en) * | 2021-07-30 | 2021-11-12 | 华南理工大学 | Method, device and system for detecting column leg stress under radial load of three-column insulator |
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