CN115508025A - Method for detecting gas trace leakage of transformer substation gas-filled power equipment - Google Patents
Method for detecting gas trace leakage of transformer substation gas-filled power equipment Download PDFInfo
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- CN115508025A CN115508025A CN202211180782.2A CN202211180782A CN115508025A CN 115508025 A CN115508025 A CN 115508025A CN 202211180782 A CN202211180782 A CN 202211180782A CN 115508025 A CN115508025 A CN 115508025A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/36—Investigating fluid-tightness of structures by using fluid or vacuum by detecting change in dimensions of the structure being tested
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0616—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating
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Abstract
The invention discloses a method for detecting trace gas leakage of a transformer substation inflatable power device, which comprises the following steps: screening a coating having an adhesion force to a surface of the pneumatic power device equal to or about equal to a pressure rating of the pneumatic power device; forming a layer of the coating on the surface of the inflatable electric power equipment; and judging the gas trace leakage point of the inflatable power equipment according to the deformation of the coating. The invention can not only detect the trace gas leakage, but also has low cost, simple operation in the detection process and obvious leakage characterization phenomenon, and improves the gas leakage defect discovery rate of the inflation equipment.
Description
Technical Field
The invention relates to the technical field of insulating gas leakage detection of transformer substation inflating power equipment, in particular to a method for detecting trace gas leakage of transformer substation inflating power equipment.
Background
Common gas-filled electric power equipment for substations, e.g. GIS, SF 6 Circuit breaker, inflatable voltage transformer, inflatable current transformer and SF 6 In many cases, sulfur hexafluoride or other gases are used as an insulating gas in lightning arresters and the like, and leakage of the insulating gas causes strong insulation in electrical equipmentThe degree is reduced, the power equipment is tripped if the degree is low, and the equipment explosion is caused if the degree is high, and serious safety accidents are caused.
The current gas leakage detection method mainly comprises three methods, which are respectively as follows: air-filled bundling, infrared leak detection, and liquid bubbling. The inflation bundling method has the disadvantages of troublesome operation, difficult detection of trace gas leakage, high requirement on operators and difficult accurate positioning of leakage points; the infrared leak detection method has the advantages that the method can be operated in a live-line mode, but has high requirements on technical personnel, the leak detection equipment has high price and is greatly influenced by natural environment, and trace gas leakage cannot be detected; the liquid bubbling method mainly comprises the steps of coating liquid on the surface, adding substances such as soap and the like which are easy to generate bubbles after encountering gas into the liquid, and judging whether the gas leakage defect exists or not by observing the change of the bubbles in the liquid.
The three detection methods cannot detect the leakage point with a small leakage amount, so how to search the trace gas leakage point becomes a problem to be solved urgently by the power grid operation and maintenance personnel.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the method for detecting the trace gas leakage of the transformer substation inflating power equipment.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for detecting trace gas leakage of a transformer substation gas-filled power device comprises the following steps:
screening a coating having an adhesion force to a surface of the pneumatic power device equal to or about equal to a pressure rating of the pneumatic power device;
forming a layer of the coating on the surface of the inflatable electric power equipment;
and judging the gas trace leakage point of the gas-filled power equipment according to the deformation of the coating.
The embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the coating is formed on the surface of the inflatable electric power equipment, so that trace leakage gas can be continuously accumulated between the coating and the surface of the inflatable electric power equipment, the coating is obviously deformed such as uplift and damage, the trace gas leakage can be detected, and the position of a leakage point can be accurately determined. In addition, the detection method has low cost, simple operation in the detection process and obvious leakage characterization phenomenon, and improves the air leakage defect discovery rate of the inflating equipment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The invention discloses a method for detecting trace gas leakage of a transformer substation inflatable power device, which comprises the following steps:
s1: and screening the coating, wherein the adhesion force of the coating and the surface of the inflatable electric power equipment is approximately equal to the rated pressure of the inflatable electric power equipment.
In the above embodiments, the coating layer may be any material as long as it satisfies that the adhesion force of the coating layer to the surface of the pneumatic power device is approximately equal to the rated pressure of the pneumatic power device.
Generally, the rated pressure of the inflatable power equipment is 0.5MPa to 1.2MPa, and the adhesion of the coating is 0.5MPa to 1.2MPa.
In one embodiment, the process of screening the coating comprises: forming different coatings on the surface of the material of the inflatable electric power equipment, testing the adhesive force of each coating, and screening out the coatings with the adhesive force equal to or approximately equal to the rated pressure of the inflatable electric power equipment.
In the above embodiment, different coatings may be formed on the surface of the pneumatic power device, or different coatings may be formed on the surface of the same material as the material of the pneumatic power device to screen the coatings.
In one embodiment, the method of testing the adhesion of each coating is: and (3) drawing, namely, using an adhesion force drawing tester to refer to the adhesion force test of a colored paint and varnish drawing method of the standard GB/T5210-2006, reducing the application speed of force, slowly applying pressure at the speed of 0.05MPa/s, and measuring the peak value of the tensile force, namely the adhesion force of the coating.
S2: after the appropriate coating is screened out, the coating is formed on the surface of the pneumatic power equipment.
Specifically, coating slurry is prepared firstly, then the coating slurry is formed on the surface of the pneumatic power equipment, and the coating slurry is cured to form a coating. In the curing process, the coating slurry cannot be damaged, wiped and damaged, and the influence of external factors on the result is avoided.
Before the coating is formed, the method preferably further comprises a process of cleaning the surface of the pneumatic power equipment to remove substances such as oil stains, dust and the like on the surface.
S3: and judging the gas trace leakage point of the gas-filled power equipment according to the deformation of the coating.
After the coating is coated for a period of time, leaked gas is continuously accumulated between the coating and the surface of the inflatable power equipment, the pressure rises along with the gradual enrichment of the gas, the coating is finally caused to generate obvious deformation such as swelling, damage and the like, and the position where the deformation is generated can be judged as a leakage point.
According to the invention, the coating is formed on the surface of the inflatable power equipment, trace leakage gas can be continuously accumulated between the coating and the surface of the inflatable power equipment, so that the coating generates obvious deformation such as swelling, breakage and the like, the trace gas leakage can be detected, and the position of a leakage point can be accurately determined. In addition, the detection method has low cost, simple operation in the detection process and obvious leakage characterization phenomenon, and improves the air leakage defect discovery rate of the inflating equipment.
The coatings of the present invention can be applied over an extended period of time and are particularly useful for minor leaks in inflatable devices due to manufacturing or manufacturing imperfections in the device material itself, which are difficult to detect during testing of inflatable device models.
For getting rid of because of interference that artificial damage and environmental damage brought, according to the deformation of coating, after judging the gas micro leakage point of aerifing power equipment, still include:
s4: and rechecking the trace leakage point of the gas.
Specifically, a coating is formed again on the original coating on the surface of the gas micro-leakage point determined in the step S3, and after the coating is cured, the coating is subjected to isolation protection and marking, so that the coating is not affected by environmental damage, object striking and the like, and if the coating still deforms, the gas micro-leakage point is determined to be real if the coating deforms again.
In the above embodiment, before the coating layer is formed again, the coating layer is formed again directly on the original coating layer without performing a cleaning process.
In a specific embodiment, the coating is composed of acrylic resin and isocyanate, and the adhesion force of the coating and the surface of the pneumatic power equipment is changed by adjusting the ratio of the acrylic resin to the isocyanate.
Referring to table 1, which shows the adhesion of different acrylic resin and isocyanate formulations on the surface of the material, it can be seen from table 1 that: the adhesive force of the coating can be changed by adjusting the proportion of the acrylic resin and the isocyanate.
Specifically, the mass ratio of the acrylic resin to the isocyanate is 20. Preferably, the mass ratio of the acrylic resin to the isocyanate is 20. From table 1 it can be seen that: coatings comprising acrylics and isocyanates can be used to fully detect gas microleakage in pneumatic power equipment.
Table 1: adhesion of different acrylic resin and isocyanate ratios on material surface
After a certain 220kV transformer substation uses a coating comprising acrylic resin and isocyanate, after a period of time, dense cracking characteristics of the coating are found at the air leakage position, and the positions with the phenomenon are detected to have trace air leakage due to the occurrence of equipment casting sand holes through inspection. Therefore, the method for detecting the leakage point not only can detect the trace leakage point, but also has obvious characteristics of the leakage point and accurate positioning of the leakage point.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (9)
1. A method for detecting trace leakage of gas of a transformer substation gas-filled power device is characterized by comprising the following steps:
screening a coating having an adhesion force to a surface of the pneumatic power device equal to or about equal to a pressure rating of the pneumatic power device;
forming a layer of the coating on the surface of the inflatable electric power equipment;
and judging the gas trace leakage point of the inflatable power equipment according to the deformation of the coating.
2. The method for detecting the gas micro leakage of the transformer substation inflating power equipment as claimed in claim 1, wherein the coating is composed of acrylic resin and isocyanate, and the adhesion force between the coating and the surface of the inflating power equipment is changed by adjusting the proportion of the acrylic resin to the isocyanate.
3. The method for detecting the gas micro leakage of the substation gas charging power equipment as claimed in claim 2, wherein the mass ratio of the acrylic resin to the isocyanate is 20.
4. The method for detecting the gas micro leakage of the substation gas charging power equipment according to claim 2, wherein the mass ratio of the acrylic resin to the isocyanate is 20.
5. The method for detecting the trace gas leakage of the transformer substation inflating power equipment as claimed in claim 1, wherein the credit pressure is 0.5 MPa-1.2 MPa.
6. The method for detecting the micro gas leakage of the substation inflating power equipment as claimed in any one of claims 1 to 5, wherein the process of screening the coating comprises the following steps:
forming different coatings on the surface of the same material of the inflatable electric power equipment, testing the adhesive force of each coating, and screening out the coatings with the adhesive force equal to or approximately equal to the rated pressure of the inflatable electric power equipment.
7. The method for detecting the gas micro-leakage of the substation gas-filled power equipment according to claim 6, wherein the method for testing the adhesion force of each coating comprises the following steps: and (4) a drawing method.
8. The method for detecting the trace leakage of the gas in the substation inflating power equipment according to any one of claims 1 to 5, wherein after the step of judging the trace leakage point of the gas in the inflating power equipment according to the deformation of the coating, the method further comprises the following steps: and rechecking the gas micro-leakage point.
9. The method for detecting the gas micro-leakage of the substation gas charging power equipment according to claim 8, wherein the rechecking of the gas micro-leakage point comprises: and forming the coating again above the original coating on the surface of the gas micro-leakage point, after the coating is cured, carrying out isolation protection and marking on the coating, and if the coating deforms again, determining that the gas micro-leakage point is real.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211180782.2A CN115508025A (en) | 2022-09-27 | 2022-09-27 | Method for detecting gas trace leakage of transformer substation gas-filled power equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211180782.2A CN115508025A (en) | 2022-09-27 | 2022-09-27 | Method for detecting gas trace leakage of transformer substation gas-filled power equipment |
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| Publication Number | Publication Date |
|---|---|
| CN115508025A true CN115508025A (en) | 2022-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211180782.2A Pending CN115508025A (en) | 2022-09-27 | 2022-09-27 | Method for detecting gas trace leakage of transformer substation gas-filled power equipment |
Country Status (1)
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|---|---|
| CN (1) | CN115508025A (en) |
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2022
- 2022-09-27 CN CN202211180782.2A patent/CN115508025A/en active Pending
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