CN112485177A - Detection method and application of composite insulator core rod through hole - Google Patents
Detection method and application of composite insulator core rod through hole Download PDFInfo
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- CN112485177A CN112485177A CN202011305523.9A CN202011305523A CN112485177A CN 112485177 A CN112485177 A CN 112485177A CN 202011305523 A CN202011305523 A CN 202011305523A CN 112485177 A CN112485177 A CN 112485177A
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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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The application belongs to the technical field of insulator quality detection. The application provides a detection method and application of composite insulator plug through hole, after reaching certain concentration through volatility solution volatilizees in sealed environment, volatility gas in the environment can diffuse rapidly to the hole of composite insulator plug in and reach certain concentration, condenses in the hole at first segmentation, and then forms the liquid passage of intercommunication, can contact and spread to the up end along the runner with these liquid passage after the dyestuff gets into, forms the infiltration passageway that runs through. The condensation effect of volatile gas is utilized to drive the dye to diffuse into the whole through hole of the composite insulator core rod, so that the dye is not limited by capillary action and is not influenced by a pore structure, the detection capability of the through hole in the core rod is improved, and particularly, the detection effect on the communicated through hole in the core rod is better, so that the problems of aging and string breaking faults of the composite insulator in the operation process are effectively avoided.
Description
Technical Field
The application belongs to the technical field of insulator quality detection, and particularly relates to a detection method and application of a composite insulator core rod through hole.
Background
The dye penetration test is an important detection method for the through hole in the composite insulator. In recent years, although the composite insulator which is connected to the network can meet the national standard requirements, the abnormal heating defect and the rotten abnormal fracture accident still exist generally. The fault is found to be related to the through hole gap in the core rod through tests, however, after the core rod is checked according to the dye penetration test method given by the existing detection method, the through penetration of the dyeing liquid in the insulator core rod is found not to occur. Thus, the effectiveness of the existing dye penetration test is severely inadequate.
Disclosure of Invention
In view of this, the present application provides a method and an application for detecting a through hole of a composite insulator core rod, which can effectively detect the through hole of the composite insulator core rod.
The specific technical scheme of the application is as follows:
the application provides a detection method of a composite insulator core rod through hole, which comprises the following steps:
s1: laying a layer of substrate in a container, pouring a volatile solution containing dye into the container, sealing and standing;
s2: cutting and polishing the composite insulator core rod, enabling the cutting surface of the composite insulator core rod to face upwards, and placing the composite insulator core rod on the substrate at intervals for sealing and permeating;
if the cutting surface is dyed, a through hole exists in the composite insulator core rod.
In this application, volatile solution volatilizees in sealed environment and reaches certain concentration after, volatile gas in the environment can diffuse rapidly to the hole of composite insulator plug and reach certain concentration, and the segmentation condenses in the hole earlier, and then forms the liquid passage of intercommunication, can contact and spread to the up end along the runner with these liquid passage after the dyestuff gets into, forms the infiltration passageway that runs through. The condensation effect of volatile gas is utilized to drive the dye to diffuse into the whole through hole of the composite insulator core rod, so that the dye is not limited by capillary action and is not influenced by a pore structure, the detection capability of the through hole in the core rod is improved, and particularly, the detection effect on the communicated through hole in the core rod is better, so that the problems of aging and string breaking faults of the composite insulator in the operation process are effectively avoided.
Preferably, the sealing and standing time is (24-36) h;
the time of sealing and permeating is (10-15) min.
Preferably, the volatile solution is an ethanol solution.
Preferably, the dye is fuchsin reagent, methyl red or methyl blue, and the volume concentration of the dye in the volatile solution is (0.5-1)%.
Preferably, the liquid level of the volatile solution in S1 is higher than the steel balls (2-3) mm.
Preferably, the substrate is a steel ball, and the diameter of the steel ball is (1-2) mm.
Preferably, the sealed permeable environment is filled with a saturated volatile gas.
Preferably, the cutting direction is perpendicular to the axis of the composite insulator core rod, and the cutting length is (10-30) mm.
Preferably, the polishing specifically comprises: and polishing the cutting surface by using fine sand paper, wherein the mesh number of the fine sand paper is (36-180).
The application also provides application of the detection method in detection of the composite insulator core rod communicated through hole.
To sum up, this application provides a detection method and application of composite insulator plug through hole, volatilize in sealed environment through volatile solution and reach certain concentration after, volatile gas in the environment can diffuse rapidly to the hole of composite insulator plug and reach certain concentration, condenses at the earlier stage in the hole, and then forms the liquid passage of intercommunication, can contact and spread to the up end along the runner with these liquid passage after the dyestuff gets into, forms the infiltration passageway that runs through. The condensation effect of volatile gas is utilized to drive the dye to diffuse into the whole through hole of the composite insulator core rod, so that the dye is not limited by capillary action and is not influenced by a pore structure, the detection capability of the through hole in the core rod is improved, and particularly, the detection effect on the communicated through hole in the core rod is better, so that the problems of aging and string breaking faults of the composite insulator in the operation process are effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a graph showing the test results of a composite insulator mandrel sample in example 1 of the present application;
FIG. 2 is a diagram showing the test results of the composite insulator mandrel sample with abnormal heat generation in example 1 of the present application (left: CT micrograph of through hole in the composite insulator mandrel sample; right: photograph of cut surface of the composite insulator mandrel sample);
FIG. 3 is a schematic structural diagram of a communication type through hole in a composite insulator core rod (left: the overall structure diagram of the through hole; middle: the side structure diagram of the through hole; right: the end face structure diagram of the through hole);
FIG. 4 is a schematic diagram of a standard dye penetration test in example 1 of the present application;
FIG. 5 is a schematic structural diagram of a through-hole inspection apparatus in embodiment 2 of the present application;
FIG. 6 is a graph showing the test results of the composite insulator mandrel sample of example 2 of the present application (left: 10mm sample; middle: 20mm sample; right: 30mm sample);
FIG. 7 is a schematic diagram of a dye permeation test in example 2 of the present application;
FIG. 8 is a graph showing a comparison of permeation positions of two dye permeation tests in example 3 of the present application (left: after the first dye permeation; right: after the second dye permeation).
Illustration of the drawings: 1. a non-effective penetration area; 2. a pore passage; 3. ethanol gas; 4. a coagulation zone; 5. a permeate channel.
Detailed Description
In order to make the objects, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application are clearly and completely described, and it is obvious that the embodiments described below are only a part of the embodiments of the present application, 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 application.
Example 1
Carrying out dye penetration test on a composite insulator core rod sample (10mm) with abnormal heating phenomenon after use: the composite insulator taken from the production line is processed into a 10mm core rod short sample, and a layer of steel balls with the same diameter is placed in a container or a tray, wherein the diameter of the steel balls is 1 mm. The short core rod sample is placed on the steel ball in the direction that the fiber is vertically upward, and the dyeing liquid is poured into a container, wherein the liquid level is 2mm higher than the top of the ball. The staining solution is methanol solution containing 1% red dye, and the staining solution will rise through the core body under the action of capillary. After 15min of penetration, the results of the dye penetration test are shown in fig. 1, and it can be seen that no dye penetration occurred at the cut surface.
Then, the through hole in the composite insulator core rod sample with abnormal heat generation was scanned by using a micro CT, and the result is shown in fig. 2. Experimental results show that a through hole structure contained in the core rod is formed by communicating a plurality of adjacent pores, although the pores cannot independently penetrate through a core rod sample, the more the pores are communicated with each other, the longer the length of the formed integral structure is, and if enough pores are communicated with each other, a through hole penetrating through the sample can be formed, as shown in fig. 3, such a pore is a communicated through hole.
As shown in fig. 4, for the communicating type through-hole, the through-penetration of the staining solution must pass through the communication point between the pores, and the diffusion process of the staining solution must include the ineffective penetration area 1 in the closed pores. In the standard dye penetration test of example 1, the dyeing solution is diffused by capillary action, and the path thereof can only be diffused along the pore passage 2, and the dyeing solution cannot form penetration permeation on the upper end surface of the communicating through-hole through a zigzag path within a limited time, so that effective detection of such through-hole cannot be realized, and only the cracking condition existing in the core rod can be detected.
Example 2
The detection method provided by the application is adopted to carry out the penetration test of the through-hole dye on the composite insulator core rod sample in the embodiment 1, and the specific operation is as follows:
(1) detecting sample processing
Step 1: removing the high-voltage end hardware of the tested composite insulator product, and dividing the composite insulator into 10 regions with equal length from the high-voltage end to the low-voltage end;
step 2: cutting a sample in each area by using a diamond circular saw blade under flowing cold water, wherein the cutting direction is vertical to the axis of the mandrel, the lengths of the samples are respectively 10mm +/-1 mm, 20mm +/-1 mm and 30mm +/-1 mm, and the processing quantity of each sample is 10;
and step 3: and removing the sheath layer of the sample, and polishing the cut end face to be smooth by using 180-mesh fine abrasive paper, wherein the side face of the sample should not have the sheath layer residue.
(2) Through-hole inspection device preparation
As shown in figure 5, a transparent box is used as a container, a layer of steel ball with the diameter of 1mm is placed in the box, 1% pinkish red ethanol solution is poured into the box before the test is started, the liquid level is higher than the ball top by 2mm, and after a transparent box cover is covered, a plastic sealing bag is used for sealing outside the transparent box well to ensure that air in the box is not exchanged with outside air in the test process. After 24 hours, the core rod sample was placed on the steel ball in the box with the fibers facing vertically upward, and the transparent box was sealed again to begin the test.
(3) Penetration test in a through-hole detection device
Step 1: grouping the composite insulator core rod samples according to the length of the core rod, vertically and upwards placing the core rod samples on steel balls in a transparent box according to fibers, avoiding mutual contact among the samples in the placing process, and not allowing dyeing liquor to pollute the upper end faces of the samples in any form;
step 2: after 15min, 20min and 25min, respectively taking out 10mm, 20mm and 30mm core rod samples which are placed in a transparent box, and observing whether the upper end surface of the sample has penetration of the dyeing solution or not;
and step 3: sequentially checking dye penetration points on the upper end surfaces of 10mm, 20mm and 30mm core rod samples, and if penetration of a penetration dyeing solution is not found in the 10mm core rod sample, determining that the length of the communication type through hole in the core rod is not more than 10 mm; if the penetration of the throughout dyeing liquid is found in a 10mm core rod sample, but the penetration of the throughout dyeing liquid is not found in a 20mm core rod sample, the length of the communication type through hole in the core rod is considered to be 10-20 mm; if the penetration of the throughout dyeing solution is found in 10mm and 20mm core rod samples, but not found in 30mm core rod samples, the length of the communication type through hole in the core rod is considered to be 20-30 mm; if the penetration of the through-dyeing liquid is observed in the 10mm, 20mm and 30mm core rod samples, the length of the communication-type through-hole in the core rod is considered to exceed 30 mm.
As shown in fig. 6, it can be seen that the penetration of the through-hole was detected in the 10mm sample by the detection method of the present application, and no penetration of the through-hole was detected in the 20mm and 30mm samples, indicating that the length of the communication-type through-hole in the core rod sample did not exceed 10 mm. As shown in fig. 7, the principle of the testing method provided by the present application is as follows: the ethanol gas 3 is firstly diffused and filled in the through hole, and is condensed in the through hole to form a sectional condensation zone 4, so that a through permeation channel 5 is formed, and the dyeing liquid is driven to be diffused into the whole through hole. By comparing the number and scale of dye penetration points, not only can the quality of the core rod be judged, but also the specific position of the through hole can be determined. The effective detection length of the communication type through hole in the mandrel reaches 30mm, and the length interval of the communication type through hole can be judged by manufacturing mandrel samples with different lengths.
Example 3
A core rod sample in which a colored region appears on the upper end surface in example 2 was selected, a letter "B" was written on the upper end surface as a reference, all colored regions around the letter "B" were removed by grinding, and the dye permeation test of example 2 was performed again under the same environment. The results of the two dye permeation tests before and after are shown in fig. 8, it can be found that the positions of the upper end surface staining solutions before and after appear are the same, that is, the appearance of the staining area is irrelevant to the upper end surface state of the sample, and the possibility that the staining agent carried by the ethanol gas condenses on the upper end surface is eliminated. The test results show that the coagulation effect only occurs in the through hole, and the validity and the reasonability of the detection method are verified.
After 10 mandrel samples which do not penetrate through the dyeing solution after the detection method of example 2 is adopted, the through holes are rechecked in the area penetrated by the dyeing solution by using the micro CT, and only the communicated through holes are found in 2 samples, namely, the method has high detection rate for the communicated through holes in the mandrel.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A detection method for a through hole of a composite insulator core rod is characterized by comprising the following steps:
s1: laying a layer of substrate in a container, pouring a volatile solution containing dye into the container, sealing and standing;
s2: cutting and polishing the composite insulator core rod, enabling the cutting surface of the composite insulator core rod to face upwards, and placing the composite insulator core rod on the substrate at intervals for sealing and permeating;
if the cutting surface is dyed, a through hole exists in the composite insulator core rod.
2. The detection method according to claim 1, wherein the sealing and standing time is (24-36) h;
the time of sealing and permeating is (10-15) min.
3. The detection method according to claim 1, wherein the volatile solution is an ethanol solution.
4. The detection method according to claim 1, wherein the dye is a magenta reagent, methyl red or methyl blue, and the volume concentration of the dye in the volatile solution is (0.5-1)%.
5. The detection method according to claim 1, wherein the liquid level of the volatile solution in S2 is 2-3 mm higher than the substrate.
6. The detection method according to claim 1, wherein the substrate is a steel ball, and the diameter of the steel ball is (1-2) mm.
7. The detection method according to claim 1, wherein the hermetically sealed and permeable environment is filled with a saturated volatile gas.
8. The detection method according to claim 1, wherein the cutting direction is perpendicular to the axis of the composite insulator core rod, and the cutting length is (10-30) mm.
9. The detection method according to claim 1, wherein the polishing is specifically: and polishing the cutting surface by using fine sand paper, wherein the mesh number of the fine sand paper is (36-180).
10. The application of the detection method of any one of claims 1 to 9 in detecting the composite insulator core rod communication type through hole.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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