CN112485177B - Method for detecting through hole of composite insulator core rod - Google Patents
Method for detecting through hole of composite insulator core rod Download PDFInfo
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- CN112485177B CN112485177B CN202011305523.9A CN202011305523A CN112485177B CN 112485177 B CN112485177 B CN 112485177B CN 202011305523 A CN202011305523 A CN 202011305523A CN 112485177 B CN112485177 B CN 112485177B
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- core rod
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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 insulator quality detection technical field. The application provides a detection method of a through hole of a composite insulator core rod, after volatile solution volatilizes in a sealed environment to reach a certain concentration, volatile gas in the environment can rapidly diffuse into pores of the composite insulator core rod and reach a certain concentration, and is firstly condensed in the pores in a segmented manner, so that communicated liquid channels are formed, and after dye enters, the dye can contact with the liquid channels and diffuse to an upper end face along a flow channel to form a penetrating channel. The dye is driven to diffuse into the whole through hole of the composite insulator core rod by utilizing the condensation effect of volatile gas, 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 the dye has a better detection effect especially for the detection of the communicated through hole in the core rod, thereby effectively avoiding the problems of ageing and broken string faults of the composite insulator in the operation process.
Description
Technical Field
The application belongs to the technical field of insulator quality detection, and particularly relates to a detection method of a composite insulator core rod through hole.
Background
Dye penetration test is an important detection method for through holes in composite insulators. In recent years, although the net-inserted composite insulator can meet the national standard requirements, abnormal heating defects and abnormal breakage accidents of the decay shape still exist universally. It was found through experiments that the failure was related to the penetrating pores in the core rod, however, after examining the core rod according to the dye penetration test method given by the existing detection method, it was found that no penetrating penetration of the dye solution in the insulator core rod occurred. Thus, the effectiveness of existing dye penetration tests is severely deficient.
Disclosure of Invention
In view of the above, the present application provides a method for detecting a composite insulator mandrel penetration hole, which can effectively detect the composite insulator mandrel penetration hole.
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: paving a layer of substrate in the container, pouring volatile solution containing dye into the container, sealing and standing;
s2: cutting and polishing the composite insulator core rod, wherein the cutting surface of the composite insulator core rod faces upwards, and the composite insulator core rod is placed on the substrate at intervals to be sealed and permeated;
if the cut surface is dyed, a through hole exists in the composite insulator core rod.
In the application, after the volatile solution volatilizes in a sealed environment to reach a certain concentration, the volatile gas in the environment can be rapidly diffused into the pores of the composite insulator core rod and reach a certain concentration, and is firstly condensed in the pores in a sectional manner, so that a communicated liquid channel is formed, and after the dye enters, the volatile solution can be contacted with the liquid channels and is diffused to the upper end face along the flow channel to form a penetrating channel. The dye is driven to diffuse into the whole through hole of the composite insulator core rod by utilizing the condensation effect of volatile gas, 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 the dye has a better detection effect especially for the detection of the communicated through hole in the core rod, thereby effectively avoiding the problems of ageing and broken string faults of the composite insulator in the operation process.
Preferably, the sealing and standing time is (24-36) h;
the sealing permeation time is (10-15) min.
Preferably, the volatile solution is an ethanol solution.
Preferably, 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)%.
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 hermetically-permeated environment is filled with saturated volatile gases.
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 cut surface by using fine sand paper, wherein the mesh number of the fine sand paper is 36-180 meshes.
The application also provides application of the detection method in detecting the communicated type through holes of the composite insulator core rod.
In summary, the application provides a method for detecting a through hole of a composite insulator core rod, after a volatile solution volatilizes in a sealed environment to reach a certain concentration, the volatile gas in the environment can rapidly diffuse into the pores of the composite insulator core rod and reach a certain concentration, and is firstly condensed in the pores in a sectional manner, so that a communicated liquid channel is formed, and after dye enters, the dye contacts with the liquid channels and diffuses to an upper end face along a flow channel to form a penetrating channel. The dye is driven to diffuse into the whole through hole of the composite insulator core rod by utilizing the condensation effect of volatile gas, 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 the dye has a better detection effect especially for the detection of the communicated through hole in the core rod, thereby effectively avoiding the problems of ageing and broken string faults of the composite insulator in the operation process.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a graph showing test results of a composite insulator mandrel sample in example 1 of the present application;
FIG. 2 is a graph of the test results of a composite insulator core rod sample with abnormal heat generation in example 1 of the present application (left: CT micrograph of through-holes in the composite insulator core rod sample; right: photograph of cut surface of the composite insulator core rod sample);
FIG. 3 is a schematic diagram of the communicating through-hole in the composite insulator core rod (left: overall structure of the through-hole; middle: side structure of the through-hole; right: end structure 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 detection device in embodiment 2 of the present application;
FIG. 6 is a graph showing test results of a composite insulator core rod sample in example 2 of the present application (left: 10mm sample; middle: 20mm sample; right: 30mm sample);
FIG. 7 is a schematic diagram of dye penetration test in example 2 of the present application;
FIG. 8 is a graph showing the 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: 1. an ineffective penetration area; 2. a pore path; 3. ethanol gas; 4. a coagulation belt; 5. and (3) a permeation channel.
Detailed Description
For the purposes of making the objects, features, and advantages of the present application more apparent and understandable, the technical solutions in the embodiments of the present application are clearly and completely described, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Example 1
Dye penetration test was performed on a composite insulator core rod sample (10 mm) having a heat abnormality after use: the composite insulator 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 1mm. The core rod short sample is placed on the steel ball in a direction of vertically upwards of the fiber, and the dyeing liquid is poured into the container, wherein the liquid level is 2mm higher than the top of the ball. The dye solution is a methanol solution containing 1% of red dye, and rises through the core body under capillary action. After 15min of permeation, the results of the dye permeation test are shown in FIG. 1, and it can be seen that no dye penetration occurs at the cut surface.
Then, the through-holes in the composite insulator core rod sample having the abnormal heat generation were scanned by using the micro-CT, and the results are shown in fig. 2. Experimental results show that the penetrating hole structure contained in the core rod is formed by mutually communicating a plurality of adjacent holes, and although the holes cannot independently penetrate through the core rod sample, the more the mutually communicated holes are, the longer the length of the integral structure is formed, if enough holes are mutually communicated, through holes penetrating through the sample can be formed, and as shown in fig. 3, the holes are communicated type penetrating holes.
As shown in fig. 4, for the communicating type through-holes, the through-penetration of the dyeing liquid must pass through the communicating points between the pores, and the diffusion process of the dyeing liquid must include the ineffective penetration area 1 within the closed pores. In the standard dye penetration test of example 1, however, the dye solution was diffused by capillary action, and the path thereof was only along the pore path 2, and the dye solution could not form penetration through the tortuous path at the upper end surface of the communicating type penetration hole in a limited time, so that the effective detection of the penetration hole could not be realized, and only the cracking condition in the core rod could be detected.
Example 2
The detection method provided by the application is adopted to carry out a through hole dye penetration test on the composite insulator core rod sample in the embodiment 1, and the specific operation is as follows:
(1) Detection sample processing
Step 1: removing a high-voltage end fitting of a tested composite insulator product, and dividing the composite insulator into 10 equal-length areas from a high-voltage end to a low-voltage end;
step 2: cutting samples in each area by using a diamond circular saw blade under flowing cold water, wherein the cutting direction is perpendicular to the axis of the core rod, the lengths of the samples are respectively 10 mm+/-1 mm,20 mm+/-1 mm and 30 mm+/-1 mm, and the processing number of each sample is 10;
step 3: the sheath layer of the sample is removed, and the cut end face is polished to be smooth by using 180-mesh fine sand paper, so that the side face of the sample is not required to be provided with the sheath layer.
(2) Preparation of a penetration hole detection device
As shown in FIG. 5, a transparent box is used as a container, a layer of steel balls with the diameter of 1mm are placed in the box, 1% fuchsin ethanol solution is poured into the box before the test is started, the liquid level is 2mm higher than the top of the balls, after the transparent box cover is covered, a plastic sealing bag is used for sealing the transparent box, and the air in the box is ensured not to exchange with the outside air in the test process. After 24 hours, the mandrel test specimen was placed vertically up on the steel ball in the box with the fiber, the transparent box was sealed again, and the test was started.
(3) Penetration test in a through-hole inspection device
Step 1: the method comprises the steps that composite insulator core rod samples are grouped according to the length of the core rod, and are vertically upwards placed on steel balls in a transparent box according to fibers, so that the samples are prevented from being contacted with each other in the placing process, and dyeing liquid is not allowed to pollute the upper end face of the sample in any form;
step 2: taking out 10mm, 20mm and 30mm core rod samples placed in a transparent box respectively after 15min, 20min and 25min, and observing whether penetrating penetration of the dyeing liquid exists on the upper end face of the sample;
step 3: sequentially checking dye penetration points of the upper end surfaces of 10mm, 20mm and 30mm core rod samples, and if penetration of penetrating dye is not found in the 10mm core rod samples, considering that the length of a communicated penetrating hole in the core rod is not more than 10mm; if penetration of the penetration dye is found in the 10mm core rod sample but not in the 20mm core rod sample, the length of the communicating type penetration hole in the core rod is considered to be 10-20 mm; if penetration of the penetrating dye is found in the 10mm and 20mm core rod samples, but not in the 30mm core rod samples, the length of the communicating penetrating holes in the core rod is considered to be 20-30 mm; if penetration of the penetration dye is found in 10mm, 20mm, 30mm core rod samples, the length of the communicating penetration holes in the core rod is considered to be in excess of 30mm.
As shown in fig. 6, it can be seen that penetration of the through-holes can be detected in the 10mm sample by the detection method of the present application, while penetration of the through-holes is not detected in the 20mm and 30mm samples, which means that the length of the communicating through-holes in the core rod sample does not exceed 10mm. As shown in fig. 7, the principle of the test method provided in the present application is as follows: the ethanol gas 3 firstly diffuses and fills the through holes, and the condensation takes place in the through holes to form segmented condensation zones 4, so as to form penetrating permeation channels 5, thereby driving the dyeing liquid to diffuse into the whole through holes. By comparing the number and the scale of the dye penetration points, the quality of the core rod can be judged, and the specific position of the through hole can be determined. In the embodiment of the application, the effective detection length of the communicating type through holes in the core rod reaches 30mm, and the length interval of the communicating type through holes can be judged by manufacturing core rod samples with different lengths.
Example 3
The core rod sample of example 2 in which the dyeing region appears on the upper end face was selected, the letter "B" was written on the upper end face as a reference, all the dyeing regions around the letter "B" were removed by polishing, and the dye penetration test of example 2 was performed again under the same environment. As shown in FIG. 8, the results of the dye permeation tests of the front and back two times show that the positions of the dye liquid on the upper end surfaces of the front and back two times are the same, namely the dyeing area is irrelevant to the state of the upper end surface of the sample, and the possibility that ethanol gas carries the dye to condense on the upper end surface is eliminated. The test results show that coagulation only occurs in the through holes, and the effectiveness and the rationality of the detection method of the application are verified.
After 10 core rod samples which are penetrated by the dyeing liquid and have not appeared by the detection method of the embodiment 2 are extracted, the penetrating holes are reexamined by using the micro CT on the region penetrated by the dyeing liquid, and the communicated penetrating holes are found in only 2 samples, namely, the method has higher detection rate on the communicated penetrating holes in the core rod.
The above embodiments are merely for illustrating the technical solution 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (7)
1. The method for detecting the through holes of the composite insulator core rod is applied to detecting the through holes of the composite insulator core rod in a communicated mode and is characterized by comprising the following steps:
s1: paving a layer of substrate in the container, pouring volatile solution containing dye into the container, sealing and standing;
s2: cutting and polishing the composite insulator core rod, wherein the cutting surface of the composite insulator core rod faces upwards, and the composite insulator core rod is placed on the substrate at intervals to be sealed and permeated;
the cutting direction is perpendicular to the axis of the composite insulator core rod, and the cutting lengths are respectively 10 mm+/-1 mm,20 mm+/-1 mm and 30 mm+/-1 mm;
the environment of the sealed permeation is filled with saturated volatile gas, the time of the sealed permeation is (15-25) min, the volatile gas is used for diffusing to the pores of the composite insulator core rod to be condensed in a segmented mode, a communicated liquid channel is formed, and dye is enabled to contact with the liquid channel after entering and diffuse to the upper end face along the flow channel to form a penetrating permeation channel;
observing whether the penetration of the dyeing liquid exists on the cutting surface of the composite insulator core rod with the cutting lengths of 10 mm+/-1 mm,20 mm+/-1 mm and 30 mm+/-1 mm respectively, and judging the length interval of the through holes if the cutting surface is dyed.
2. The method according to claim 1, wherein the sealing is allowed to stand for a period of time of (24 to 36) hours.
3. The method of claim 1, wherein the volatile solution is an ethanol solution.
4. The method according to claim 1, wherein the dye is magenta reagent, methyl red or methyl blue, and the dye is present in the volatile solution at a volume concentration of (0.5 to 1)%.
5. The detection method according to claim 1, wherein the liquid level of the volatile solution in S2 is higher than the substrate (2 to 3) mm.
6. The method of claim 1, wherein the substrate is a steel ball having a diameter of (1-2) mm.
7. The method according to claim 1, wherein the polishing is specifically: and polishing the cut surface by using fine sand paper, wherein the mesh number of the fine sand paper is 36-180 meshes.
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| CN113237809B (en) * | 2021-04-16 | 2023-03-17 | 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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