CN110243747A - A kind of appraisal procedure of insulation mandrel electric property - Google Patents
A kind of appraisal procedure of insulation mandrel electric property Download PDFInfo
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- CN110243747A CN110243747A CN201910615713.1A CN201910615713A CN110243747A CN 110243747 A CN110243747 A CN 110243747A CN 201910615713 A CN201910615713 A CN 201910615713A CN 110243747 A CN110243747 A CN 110243747A
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- 238000004043 dyeing Methods 0.000 claims description 31
- 230000035515 penetration Effects 0.000 claims description 25
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 23
- 229910052753 mercury Inorganic materials 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 16
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- 238000010603 microCT Methods 0.000 claims description 14
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 230000037361 pathway Effects 0.000 claims description 9
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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Abstract
The present invention provides a kind of appraisal procedure of insulation mandrel electric property, the appraisal procedure of the insulation mandrel electric property includes: to test the hole of insulation mandrel, is assessed according to electric property of the test result to insulation mandrel；The appraisal procedure can the electric property to the insulation mandrel for meeting national standard further assessed, the insulation mandrel of more preferable electric property can be filtered out, insulation mandrel can be increased in the service life of practical application, to ensure safe operation of electric network.
Description
Technical field
The invention belongs to electric fields, are related to a kind of appraisal procedure of insulation mandrel electric property.
Background technique
Composite insulator is the important composition component of transmission line of electricity, and since the 1980s, composite insulator is just obtained
Application has been arrived, has had 30 years history so far.Cut-off 2011, the quantity of the composite insulator of 110kV ratings above have been more than
5000000.Composite insulator is universal in power grid application, existing statistical result show using composite insulator transmission line of electricity
More than 4700, and with the propulsion of extra-high voltage direct-current engineering, tradition is set by the external insulation of predominating insulation of porcelain/glass
The standby requirement for having been unable to meet extra-high voltage direct-current engineering, composite insulator will be occupied in external insulation equipment one it is very important
Position.
Currently, as composite material manufacturing technology is horizontal and the significantly promotion of material property, composite insulator (including line
Road composite insulator is stood with composite post insulator etc.) it is promoted in the project of transmitting and converting electricity application of each voltage class.It is compound exhausted
Edge is generally made of insulation mandrel, housing and the connection gold utensil being fixed on insulation mandrel.Insulation mandrel is composite insulator
Interior insulation component, while being used to guarantee the mechanical performance of insulator, generally by glass fiber reinforcement (winding, pulling or vacuum
Dipping) thermosetting epoxy resin is made.Applied to the insulating materials of power equipment, guaranteeing security reliability simultaneously, in addition to tool
Have except hot property, mechanical property, chemical property, environmental resistance, it is also necessary to have good electric property.Glass fibre tree
Rouge has more excellent mechanical property on the basis of guaranteeing electric property, meets higher demand.
Therefore it provides a kind of method for testing insulation mandrel electric property is highly desirable.
Summary of the invention
Aiming at the above shortcomings existing in the prior art, the purpose of the present invention is to provide a kind of insulation mandrel electric properties
Appraisal procedure, the appraisal procedure can the electric property to the insulation mandrel for meeting national standard further assessed, on the one hand
The use and depreciation of expensive instrument can be reduced, it is cheap；On the other hand the insulating core of more preferable electric property can be filtered out
Stick can increase insulation mandrel in the service life of practical application, to ensure safe operation of electric network.
To achieve this purpose, the present invention adopts the following technical scheme:
The purpose of the present invention is to provide a kind of appraisal procedure of insulation mandrel electric property, the insulation mandrel electrical resistance
Can appraisal procedure include: to test the hole of insulation mandrel, according to test result to the electric property of insulation mandrel into
Row assessment.
In the present invention, the appraisal procedure of the insulation mandrel electric property includes the following steps:
(1) dyestuff penetration test is carried out to insulation mandrel, whether the electric property for assessing insulation mandrel is qualified；
(2) insulation mandrel of step (1) assessment after qualified is subjected to porosity test, assesses the electric property of insulation mandrel
It is whether good；
(3) insulation mandrel of step (2) assessment after good is subjected to hole test, the electric property for assessing insulation mandrel is
It is no outstanding.
Existing insulation subsample of problems is analyzed, finding insulator of problems generally has through logical
Road, and there are close ties in the appearance of connected pathways and dielectric, dielectric loss index.By carrying out going preliminary screening through experiment
The electric property of insulation mandrel is highly desirable.
Appraisal procedure provided by the invention can take out from the present situation on product of insulation mandrel in conjunction with the arrival of insulation mandrel
Situation and sampling observation situation are looked into, for new networking product and southern area difference running environment, different manufacturers, different voltages etc.
Grade insulate down the operating condition to make the country prosperous, progress insulation mandrel electricity function index research, to propose scientific and effective insulating core
The performance indicator and evaluation method of stick electric property.Using the appraisal procedure, on the one hand can be improved insulation mandrel operation can
By property, safe operation of electric network is ensured, on the other hand can reduce the excessive use and depreciation of expensive instrument, it is cheap.
In the present invention, the method for step (1) the dyestuff penetration test includes: that insulation mandrel sample to be measured is intercepted one
It cuts and is used as test sample, polish the cut surface of test sample, the both ends of the surface of test sample is made to be parallel to each other, by test specimens
Product are vertically upward placed on ball by fiber, and the ball is placed in container, and dyeing liquor is put into container, wear dyeing liquor
Plug rising is crossed, if occurring dyeing liquor within the testing time through phenomenon, record dyeing liquor perforative time and test sample
The pattern of upper surface determines the position where internal interface connected pathways.
In the present invention, it can be polished with 180 mesh crosus cloths the cut surface of test sample.
In the present invention, in the dyestuff penetration test, the length of test sample is 10mm.
In the present invention, in dyestuff penetration test, the diameter of ball is 1-2mm, for example, 1mm, 1.2mm, 1.5mm,
1.8mm or 2mm etc..
In the present invention, in the dyestuff penetration test, dyeing liquor includes pinkish red alcoholic solution.
In the present invention, the alcohol includes methanol and/or ethyl alcohol.
In the present invention, the concentration of the dyeing liquor be not less than 1%, such as 1%, 1.5%, 2%, 2.5%, 3%,
3.5%, 4% etc..
In the present invention, in the dyestuff penetration test, the testing time is 1.8-2.2h, preferably 2h.
It in the present invention, further include the position where determining internal interface connected pathways in the dyestuff penetration test
It postpones, microchannel is observed with scanning electron microscope.
In the present invention, the method that dye penetrant test can be used in the microcosmic interface channel inside plug is studied,
In view of dyeing liquor selects the sample with sheath (full skirt) to carry out along face infiltration in the influence to test result, research process
Dye penetrant test, and microexamination is carried out to the microstructure of through hole.
In the present invention, dyestuff runs through insulation mandrel, the electrical resistance of insulation mandrel in step (1) the dyestuff penetration test
It can be unqualified.
In the present invention, dyestuff cannot run through insulation mandrel, the electricity of insulation mandrel in step (1) the dyestuff penetration test
Gas performance is qualified.
In the present invention, qualified is to meet national standard GB/T 19519-2014 " overhead transmission line insulator nominal voltage is higher than
1000V AC system pendency and Anti-tension composite insulator definition, test method and acceptance criteria " use standard, Neng Gouzheng
Be often used, and it is unqualified then can not normal use.
In the present invention, step (2) described porosity test is carried out by mercury injection method.
In the present invention, the mercury injection method includes: the insulation by mercury indentation step (1) assessment after qualified under pressure
Porosity is tested in the inside of plug.
In the present invention, it is preferred to the running parameter of the mercury injection method include: evacuation time be 3-8min (such as 3min,
4min, 5min, 6min, 7min, 8min etc.), equilibration time is 8-15s (such as 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s
Deng), equilibrium pressure be 0.45-0.55Pa (such as 0.45Pa, 0.46Pa, 0.47Pa, 0.48Pa, 0.49Pa, 0.50Pa,
0.51Pa, 0.52Pa, 0.53Pa, 0.54Pa, 0.55Pa etc.).
In the present invention, the porosity is the insulation mandrel after the volume and step (1) assessment qualification by being pressed into mercury
Volume percentage.
In the present invention, the electric property of step (2) the porosity > 2%, insulation mandrel are qualified.
In the present invention, step (2) porosity≤2%, the electric property of insulation mandrel are good.
The present invention carries out porosity test by mercury injection method, when porosity can generate certain to the electric property of insulation mandrel
The influence of degree when porosity is excessive, then will affect electric property by testing the porosity of insulation mandrel.
In the present invention, step (3) described hole is tested by Micro-CT scanning.
In the present invention, the test method of the Micro-CT scanning includes: to emit X-ray with x-ray source, and penetration step (2) is commented
Insulation mandrel after estimating well, the different angle for carrying out 180 ° or more to the insulation mandrel after step (2) assessment well is imaged, right
Insulation mandrel after step (2) assessment is good is sampled, sample diameter 1.5mm, by computer software by different angle
Image be reconstructed, reduction forms 3D rendering, the hole in the section of the insulation mandrel after testing procedure (2) assessment is good.
In the present invention, for Micro-CT scanning in test, the diameter for needing to meet sample is 1.5mm, by assessing step (2)
Insulation mandrel after good is sampled, and insulation mandrel surface of each assessment after good can be cut into several diameters and is
The small sample of 1.5mm randomly selects 5 and is tested.
In the present invention, the scanning accuracy of the Micro-CT scanning be no more than 1 μm, such as 0.9 μm, 0.8 μm, 0.7 μm, 0.6 μm,
0.5 μm, 0.4 μm, 0.3 μm, 0.2 μm, 0.1 μm etc..
In the present invention, single hole maximum is no more than 20 μm of (such as 0 μm, 2 μm, 5 μ in the test of step (3) hole
M, 7 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm etc.), and the hole number more than 10 μm is no more than the electricity of 100 insulation mandrels
The electric property of gas excellent performance, insulation mandrel is outstanding.
In the present invention, single hole maximum be more than 20 μm (such as 20 μm, 22 μm, 25 in the test of step (3) hole
μm, 27 μm, 30 μm, 32 μm, 35 μm, 37 μm, 40 μm etc.), or hole number more than 10 μm is more than 100, insulation mandrel
Electric property is good.
Micro-CT scanning sensitivity with higher and resolution ratio in the present invention can preferably observe the hole point of insulation mandrel
Cloth and size, if but Micro-CT scanning is used only and is observed, the depreciation of higher degree, and Micro-CT scanning ratio can be generated to Micro-CT scanning
Costly, then it needs to spend a large amount of cost, is unfavorable for industrial application.
In the present invention, the material of the insulation mandrel is glass fiber reinforced epoxy resin.
In the present invention, the mode of the enhancing includes around, pulling or vacuum impregnation.
Compared with the existing technology, the invention has the following advantages:
The appraisal procedure of insulation mandrel electric property provided by the invention, the appraisal procedure being capable of insulation to national standard is met
The electric property of plug is further assessed；On the other hand the insulation mandrel of more preferable electric property, Neng Gouzeng can be filtered out
Add insulation mandrel in the service life of practical application, to ensure safe operation of electric network.
Detailed description of the invention
Fig. 1 is the curve graph of A sample and B sample water absorption and time；
Fig. 2 is the curve graph of A sample and B sample dielectric loss angle tangent and humidity exposure time.
Specific embodiment
The technical scheme of the invention is further explained by means of specific implementation.Those skilled in the art should be bright
, the described embodiments are merely helpful in understanding the present invention, should not be regarded as a specific limitation of the invention.
Embodiment 1
The present embodiment provides a kind of appraisal procedures of insulation mandrel electric property, include the following steps:
(1) dye penetrant test: the microcosmic interface channel inside plug can be used the method for dye penetrant test into
Row research, it is contemplated that dyeing liquor is selected in the influence to test result, research process with sheath (full skirt) along face infiltration
Sample carries out dye penetrant test, and carries out microexamination to the microstructure of through hole.
Sample length used in testing is 10mm.Sample cut surface is polished smooth using 180 mesh crosus cloths, it is ensured that both ends
Face should be cleaned and be parallel to each other.The identical steel ball of one layer of diameter or glass marble, sphere diameter 1mm are placed in a container or pallet.
Sample is vertically upward placed on ball by fiber, and by the dyeing liquor container of falling people, dyeing liquor is containing 1% pinkish red first
Alcohol, at the connected pathways inside plug, dyeing liquor can pass through under capillary action core and rise.If in 2h measurement process
There is dyeing liquor and run through phenomenon, then record the pattern of dyeing liquor perforative time and sample upper surface, determines that internal interface passes through
Position where break-through road, and then microchannel is observed using electronic scanner microscope (SEM).
(2) mercury injection method is tested: insulation mandrel of step (1) assessment after qualified is carried out mercury injection method test, the work of mercury injection method
As parameter include: evacuation time be 5min, equilibration time 10s, equilibrium pressure 0.5Pa, then test indentation mercury volume
Porosity is calculated with the percentage of the volume of insulation mandrel.
(3) Micro-CT scanning: X-ray is emitted with x-ray source, the insulation mandrel after penetration step (2) assessment is good, to insulating core
Stick carries out 180 ° or more of different angle imaging, and precision is not less than 1 μm, is carried out the image of different angle by computer software
Reconstruct, reduction form 3D rendering, test the hole in the section of insulation mandrel.
2000 samples are taken to repeat step (1) test, if dyestuff runs through insulation mandrel, insulating core in dyestuff penetration test
The electric property of stick is unqualified, if not through the electric property of insulation mandrel is qualified；By test, 203 samples do not conform to
Lattice, 1797 sample passes.2000 samples are tested by national standard GB/T 19519-2014, find 207 samples
Unqualified, 1793 sample passes, error 2% illustrates that the test result for the dye penetrant test that step (1) provides is accurate,
Error is within 5%.
It will repeat the qualified sample that step (1) test obtains and repeat step (2) test, porosity, which is greater than 2%, 1456
A, porosity has 337 no more than 2%；Porosity is denoted as qualification greater than 2%, porosity being denoted as no more than 2% is good
It is good.
It will repeat the good sample that step (2) test obtains and repeat step (3) test, single hole maximum is no more than 20
μm, and the hole number more than 15 μm accounts for the ratio of total pore space number lower than 20%, by the test, meets the sample of the requirement
Number have 244, be denoted as it is outstanding, it is ungratified be denoted as it is good.
By obtained electric property, respectively outstanding, good insulation mandrel carries out sucting wet experiment to it.
Sucting wet experiment test includes: that moisture absorption environment temperature is 25 DEG C, and relative humidity 99%, sample is placed on horizontal plane
At the above 2cm, after the drying and moisture absorption 6h, 12h, for 24 hours, weighing measurement is carried out after 48h, 96h, 168h.In detection process always
Keep sample surfaces without visual liquid water, therefore dielectric loss performance and hygroscopicity analysis are not influenced by condensation.It is not same to avoid
The influence of dispersibility and measurement error to experimental result, samples weighing carry out in two times between product, take the average value of two times result
As test data.
Fig. 1 is the water absorption and the curve graph of time of A sample and B sample, and wherein A sample is the sample of high porosity, B sample
Product are low porosity sample, and A sample water absorption is more as shown in Figure 1, and the water absorption of B sample is less, illustrate porosity and inhale
It is aqueous that there are positive correlations.Fig. 2 is the curve graph of A sample and B sample dielectric loss angle tangent and humidity exposure time, wherein A sample
Product are the sample of high porosity, and B sample is low porosity sample, and A sample dielectric loss angle is larger as shown in Figure 2, B sample
Dielectric loss angle is smaller, illustrates that the entrance of moisture impacts electric property.
Embodiment 2
The present embodiment provides a kind of appraisal procedures of insulation mandrel electric property, include the following steps:
(1) dye penetrant test: the microcosmic interface channel inside plug can be used the method for dye penetrant test into
Row research, it is contemplated that dyeing liquor is selected in the influence to test result, research process with sheath (full skirt) along face infiltration
Sample carries out dye penetrant test, and carries out microexamination to the microstructure of through hole.
Sample length used in testing is 10mm.Sample cut surface is polished smooth using 180 mesh crosus cloths, it is ensured that both ends
Face should be cleaned and be parallel to each other.The identical steel ball of one layer of diameter or glass marble, sphere diameter 2mm are placed in a container or pallet.
Sample is vertically upward placed on ball by fiber, and by the dyeing liquor container of falling people, dyeing liquor is containing 0.8% pinkish red second
Alcoholic solution, at the connected pathways inside plug, dyeing liquor can pass through under capillary action core and rise.If measured in 1.8h
Occur dyeing liquor in the process through phenomenon, then record the pattern of dyeing liquor perforative time and sample upper surface, determines internal hand over
Position where the connected pathways of interface, and then microchannel is observed using electron scanning fibrescope (SEM).
(2) mercury injection method is tested: insulation mandrel of step (1) assessment after qualified is carried out mercury injection method test, the work of mercury injection method
As parameter include: evacuation time be 8min, equilibration time 15s, equilibrium pressure 0.55Pa, then test indentation mercury volume
Porosity is calculated with the percentage of the volume of insulation mandrel.
(3) Micro-CT scanning: X-ray is emitted with x-ray source, the insulation mandrel after penetration step (2) assessment is good, to insulating core
Stick carries out 180 ° or more of different angle imaging, and precision is not less than 1 μm, is carried out the image of different angle by computer software
Reconstruct, reduction form 3D rendering, test the hole in the section of insulation mandrel.
2000 samples are taken to repeat step (1) test, if dyestuff runs through insulation mandrel, insulating core in dyestuff penetration test
The electric property of stick is unqualified, if not through the electric property of insulation mandrel is qualified；By test, 723 samples do not conform to
Lattice, 1277 sample passes.2000 samples are tested by national standard GB/T 19519-2014, find 728 samples
Unqualified, 1272 sample passes, error 5% illustrates that the test result for the dye penetrant test that step (1) provides is accurate,
Error is within 5%.
It will repeat the qualified sample that step (1) test obtains and repeat step (2) test, porosity, which is greater than 2%, 855
A, porosity has 517 no more than 2%；Porosity is denoted as qualification greater than 2%, porosity being denoted as no more than 2% is good
It is good.
It will repeat the good sample that step (2) test obtains and repeat step (3) test, single hole maximum is no more than 20
μm, and the hole number more than 15 μm accounts for the ratio of total pore space number lower than 20%, by the test, meets the sample of the requirement
Number have 102, be denoted as it is outstanding, it is ungratified be denoted as it is good.
Be respectively that outstanding and good insulation mandrel carries out sucting wet experiment to it by obtained electric property, test method with
Embodiment 1 is identical, it is again seen that the water absorption of high porosity sample is more, the water absorption of low porosity sample is lower, illustrates hole
There are positive correlations with water imbibition for gap rate, and water absorption is more, and the dielectric loss angle of sample is bigger, and water absorption is lower, sample
Dielectric loss angle it is lower, illustrate moisture entrance large effect is caused to electric property.
Embodiment 3
The present embodiment provides a kind of appraisal procedures of insulation mandrel electric property, include the following steps:
(1) dye penetrant test: the microcosmic interface channel inside plug can be used the method for dye penetrant test into
Row research, it is contemplated that dyeing liquor is selected in the influence to test result, research process with sheath (full skirt) along face infiltration
Sample carries out dye penetrant test, and carries out microexamination to the microstructure of through hole.
Sample length used in testing is 10mm.Sample cut surface is polished smooth using 180 mesh crosus cloths, it is ensured that both ends
Face should be cleaned and be parallel to each other.The identical steel ball of one layer of diameter or glass marble, sphere diameter are placed in a container or pallet
1.5mm.Sample is vertically upward placed on ball by fiber, and by the dyeing liquor container of falling people, dyeing liquor is containing 1.2% product
Red methanol solution, at the connected pathways inside plug, dyeing liquor can pass through under capillary action core and rise.If
Occur dyeing liquor in 2.2h measurement process through phenomenon, then records the pattern of dyeing liquor perforative time and sample upper surface, really
Position where fixed internal interface connected pathways, and then microchannel is observed using electron scanning fibrescope (SEM).
(2) mercury injection method is tested: insulation mandrel of step (1) assessment after qualified is carried out mercury injection method test, the work of mercury injection method
As parameter include: evacuation time be 3min, equilibration time 8s, equilibrium pressure 0.45Pa, then test indentation mercury volume
Porosity is calculated with the percentage of the volume of insulation mandrel.
(3) Micro-CT scanning: X-ray is emitted with x-ray source, the insulation mandrel after penetration step (2) assessment is good, to insulating core
Stick carries out 180 ° or more of different angle imaging, and precision is not less than 1 μm, is carried out the image of different angle by computer software
Reconstruct, reduction form 3D rendering, test the hole in the section of insulation mandrel.
2000 samples are taken to repeat step (1) test, if dyestuff runs through insulation mandrel, insulating core in dyestuff penetration test
The electric property of stick is unqualified, if not through the electric property of insulation mandrel is qualified；By test, 232 samples do not conform to
Lattice, 1768 sample passes.2000 samples are tested by national standard GB/T 19519-2014, find 230 samples
Unqualified, 1770 sample passes, error 2% illustrates that the test result for the dye penetrant test that step (1) provides is accurate,
Error is within 5%.
It will repeat the qualified sample that step (1) test obtains and repeat step (2) test, porosity, which is greater than 2%, 468
A, porosity has 1300 no more than 2%；Porosity is denoted as qualification, porosity being denoted as no more than 2% greater than 2%
Well.
It will repeat the good sample that step (2) test obtains and repeat step (3) test, single hole maximum is no more than 20
μm, and the hole number more than 15 μm accounts for the ratio of total pore space number lower than 20%, by the test, meets the sample of the requirement
Number have 180, be denoted as it is outstanding, it is ungratified be denoted as it is good.
Be respectively that outstanding and good insulation mandrel carries out sucting wet experiment to it by obtained electric property, test method with
Embodiment 1 is identical, it is again seen that the water absorption of high porosity sample is more, the water absorption of low porosity sample is lower, illustrates hole
There are positive correlations with water imbibition for gap rate, and water absorption is more, and the dielectric loss angle of sample is bigger, and water absorption is lower, sample
Dielectric loss angle it is lower, illustrate moisture entrance large effect is caused to electric property.
The Applicant declares that the foregoing is merely a specific embodiment of the invention, but protection scope of the present invention not office
It is limited to this, it should be clear to those skilled in the art, any to belong to those skilled in the art and take off in the present invention
In the technical scope of dew, any changes or substitutions that can be easily thought of, and all of which fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. a kind of appraisal procedure of insulation mandrel electric property, which is characterized in that the assessment side of the insulation mandrel electric property
Method includes: to test the hole of insulation mandrel, is assessed according to electric property of the test result to insulation mandrel.
2. the appraisal procedure of insulation mandrel electric property according to claim 1, which is characterized in that the insulation mandrel electricity
The appraisal procedure of gas performance includes the following steps:
(1) dyestuff penetration test is carried out to insulation mandrel, whether the electric property for assessing insulation mandrel is qualified；
(2) insulation mandrel of step (1) assessment after qualified is subjected to porosity test, assess insulation mandrel electric property whether
Well；
(3) insulation mandrel of step (2) assessment after good is subjected to hole test, whether the electric property for assessing insulation mandrel is excellent
It is elegant.
3. the appraisal procedure of insulation mandrel electric property according to claim 2, which is characterized in that step (1) described dye
The method of material penetration testing includes: that insulation mandrel sample to be measured is intercepted one section of cutting as test sample, to test sample
Face is polished, and the both ends of the surface of test sample is made to be parallel to each other, and test sample is vertically upward placed on ball by fiber,
The ball is placed in container, and dyeing liquor is put into container, increase across plug dyeing liquor, if occurred within the testing time
Dyeing liquor runs through phenomenon, records the pattern of dyeing liquor perforative time and test sample upper surface, determines that internal interface runs through
Position where channel.
4. the appraisal procedure of insulation mandrel electric property according to claim 2 or 3, which is characterized in that the dyestuff seeps
Thoroughly in test, the length of test sample is 5-15mm, preferably 10mm；
Preferably, in the dyestuff penetration test, the diameter of ball is 1-2mm；
Preferably, in the dyestuff penetration test, dyeing liquor includes pinkish red alcoholic solution；
Preferably, the alcohol includes methanol and/or ethyl alcohol；
Preferably, the concentration of the dyeing liquor is not less than 1%；
Preferably, in the dyestuff penetration test, the testing time is 1.8-2.2h, preferably 2h；
It preferably, further include after determining the position where internal interface connected pathways, with sweeping in dyestuff penetration test
Electron microscope is retouched to observe microchannel.
5. according to the appraisal procedure of the described in any item insulation mandrel electric properties of claim 2-4, which is characterized in that step
(1) dyestuff runs through insulation mandrel in the dyestuff penetration test, and the electric property of insulation mandrel is unqualified；
Preferably, dyestuff cannot run through insulation mandrel in step (1) the dyestuff penetration test, and the electric property of insulation mandrel is closed
Lattice.
6. according to the appraisal procedure of the described in any item insulation mandrel electric properties of claim 2-5, which is characterized in that step
(2) porosity test is carried out by mercury injection method；
Preferably, the mercury injection method includes: the interior of the insulation mandrel by mercury indentation step (1) assessment after qualified under pressure
Portion tests porosity；
Preferably, it is 3-8min, equilibration time 8-15s, equilibrium pressure that the running parameter of the mercury injection method, which includes: evacuation time,
For 0.45-0.55Pa；
Preferably, the porosity is the volume of the insulation mandrel after the volume and step (1) assessment qualification by being pressed into mercury
Percentage.
7. according to the appraisal procedure of the described in any item insulation mandrel electric properties of claim 2-6, which is characterized in that step
(2) electric property of the porosity > 2%, insulation mandrel are qualified；
Preferably, step (2) porosity≤2%, the electric property of insulation mandrel are good.
8. according to the appraisal procedure of the described in any item insulation mandrel electric properties of claim 2-7, which is characterized in that step
(3) hole is tested by Micro-CT scanning；
Preferably, the test method of the Micro-CT scanning includes: to emit X-ray with x-ray source, after penetration step (2) assessment is good
Insulation mandrel, carry out 180 ° or more of different angle imaging, the image of different angle be reconstructed by computer software,
Reduction forms 3D rendering, the hole in the section of the insulation mandrel after testing procedure (2) assessment is good；
Preferably, the scanning accuracy of the Micro-CT scanning is no more than 1 μm.
9. the appraisal procedure of insulation mandrel electric property according to claim 8, which is characterized in that step (3) described hole
Single hole maximum is no more than 20 μm in gap test, and the hole number more than 10 μm is no more than the electrical of 100 insulation mandrels
Excellent performance；
Preferably, single hole maximum is more than 20 μm in step (3) the hole test, or the hole number more than 10 μm is more than
100, the electric property of insulation mandrel is good.
10. the appraisal procedure of -9 described in any item insulation mandrel electric properties according to claim 1, which is characterized in that described
The material of insulation mandrel is glass fiber reinforced epoxy resin；
Preferably, the mode of the enhancing includes around, pulling or vacuum impregnation.
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| CN112485177A (en) * | 2020-11-19 | 2021-03-12 | 贵州电网有限责任公司 | Detection method and application of composite insulator core rod through hole |
| CN113237809A (en) * | 2021-04-16 | 2021-08-10 | 贵州电网有限责任公司 | Composite insulator core rod porosity evaluation method |
| CN113376052A (en) * | 2021-05-20 | 2021-09-10 | 贵州电网有限责任公司 | Composite insulator core rod performance evaluation method |
| CN113639642A (en) * | 2021-09-09 | 2021-11-12 | 郑州聚成电气技术有限公司 | Method for detecting hole length and heating hidden danger of composite insulator core rod |
| CN113686748A (en) * | 2021-07-27 | 2021-11-23 | 南方电网科学研究院有限责任公司 | Method for classifying pore structures of composite insulator core rods |
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