CN107831423B - composite insulator interface defect identification method based on infrared thermal image axis temperature identification - Google Patents
composite insulator interface defect identification method based on infrared thermal image axis temperature identification Download PDFInfo
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- CN107831423B CN107831423B CN201711079351.6A CN201711079351A CN107831423B CN 107831423 B CN107831423 B CN 107831423B CN 201711079351 A CN201711079351 A CN 201711079351A CN 107831423 B CN107831423 B CN 107831423B
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- 239000012212 insulator Substances 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 43
- 230000007547 defect Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 21
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- 238000009835 boiling Methods 0.000 claims description 5
- 239000011780 sodium chloride Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 230000004323 axial length Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000001931 thermography Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
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- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Insulators (AREA)
Abstract
the invention relates to a composite insulator interface defect identification method based on infrared thermal image axis temperature identification. The method defines a heating section and three characteristic parameters thereof, provides an interface defect identification criterion and a method, comprises the steps of pressurizing a boiled insulator sample, acquiring an infrared thermal image, analyzing and processing the infrared thermal image, extracting the characteristic parameters of the starting heating section, and finally identifying the interface defect by using the identification criterion, can effectively identify the interface defect of the composite insulator, provides useful information for regularly replacing the composite insulator of the line, and ensures the safe operation of the power line.
Description
Technical Field
The invention relates to a method for identifying the interface defects of a composite insulator, in particular to a method for identifying the temperature of an operating composite insulator based on the axis of a digital thermal image.
background
the composite insulator is inevitably influenced by various factors in the environment in the operation process, wherein the factors comprise electric field action, mechanical load action, dirt, acid rain, moisture, ultraviolet radiation and the like. The interface defect can cause partial discharge at the defect position, further deterioration of the defect position is caused, the deterioration is inwards developed to cause the mechanical property of the core rod to be reduced, and the deterioration is outwards developed to cause the perforation of the umbrella cover. After the umbrella sleeve is perforated, external dirt, acid rain and the like can enter the composite insulator to further erode the core rod, so that the core rod is brittle or broken under the combined action of acid liquor and surface micro-current. It is noteworthy that in the case of a break in the running composite insulator, abnormal heating is often detected before it breaks.
The infrared thermal imager is widely applied to various industrial fields at present due to the advantages of no need of contact, no destructiveness and the like, is a common means for measuring the temperature of the line insulator, and can effectively detect abnormal heating of the composite insulator in an operating line. In addition, the infrared thermography method is also used for researching the heating mechanism of the high-voltage composite insulator in a laboratory. In the existing research on the heating phenomenon of the composite insulator by using an infrared thermography method, an analysis method for a whole test sample is lacked.
Disclosure of Invention
the invention aims to solve the technical problem of providing a composite insulator interface defect identification method based on infrared thermal image axis temperature identification, which can be used for identifying the interface defect of a running composite insulator, identifying the product quality and providing useful information for replacing the composite insulator of a line at regular intervals.
the technical scheme adopted by the invention is as follows:
a composite insulator interface defect identification method based on infrared thermal image axis temperature identification is characterized in that an axis temperature-length distribution curve is established, and the curve is defined as follows:
defining one heating segment: respectively taking 10K and 40K as temperature rise reference values, adding the temperature rise reference value to the surface temperature of the sample before pressurization to obtain corresponding temperature reference values, taking each temperature reference value as a vertical coordinate, making a horizontal line on an axis temperature-length distribution curve, and defining the part of the curve above the horizontal line as a heating section;
defining the position of a second heating section: the abscissa x of the center of the heating segment;
defining three, heating segment length: difference of abscissa between head and tail points of heating segment
defining four, maximum temperature of the heating section: a longitudinal coordinate y of a peak point appearing in the heating section;
the method comprises the following steps:
step 1, taking down a detected composite insulator from an operation line, cleaning the surface of the composite insulator, putting the composite insulator into a boiling sodium chloride aqueous solution for a water boiling test, taking out a detected product after the composite insulator is boiled for a set time, and measuring and recording the surface temperature of the detected product after the detected product is naturally cooled;
Step 2, proportionally applying power frequency voltage to the tested sample, and continuously setting time in the pressurizing process;
Step 3, measuring the surface temperature of the test sample by using a thermal infrared imager, obtaining an infrared thermograph after the composite insulator is pressurized, analyzing and processing data in the infrared thermograph to obtain an axial temperature-length distribution curve of the test sample, and identifying interface defects according to the axial temperature-length distribution curve, wherein the specific method for obtaining the axial temperature-length distribution curve comprises the following steps of:
Step 301, finding a region where a test article is located in an infrared thermograph, extracting a temperature value of each pixel point in the region, and selecting a maximum temperature value in the radial direction of each axial position along the axial direction of the test article as the temperature of the axial position;
Step 302, taking one end of a test sample pressurizing section as a starting point, taking the axial length as a horizontal coordinate, and taking the temperature at the axial position as a vertical coordinate to obtain an axial temperature-length distribution curve of the test sample;
step 4, evaluating the interface performance of the tested product according to an interface defect identification criterion, wherein the interface defect identification criterion comprises the following steps:
according to the first identification criterion, the heating section with the temperature rising above 20K exceeds a set length;
according to the second identification criterion, a heating section with set temperature rise is generated;
in the method for identifying the composite insulator interface defects based on infrared thermography axis temperature identification, in the step 1, the conductivity of a sodium chloride solution is 1670 muS/cm-1830 muS/cm at 20 ℃;
in the method for identifying the composite insulator interface defects based on infrared thermography axis temperature identification, in the step 2, the selected length is 0.5-1.2 m, and the effective value of the applied proportional power frequency voltage is 200 kV/m-300 kV/m;
in the method for identifying the composite insulator interface defect based on the infrared thermography axis temperature identification, if the detected product meets any one of the two criteria in the step 4, the detected product can be regarded as having a serious interface defect.
therefore, the method can quickly and effectively identify the interface defect of the running composite insulator, identify the product quality and provide useful information for regularly replacing the line composite insulator.
drawings
FIG. 1 is a flow chart of an authentication method implementation;
FIG. 2 is an infrared thermography of multiple samples being simultaneously detected;
FIG. 3 is an infrared thermal image of a sample and its corresponding axial temperature-length distribution curve;
FIG. 4 shows the sample of FIG. 3 with an interface defect that is destroyed in a steep-wave impulse voltage test.
Detailed Description
as shown in fig. 1, the method for identifying the composite insulator interface defects based on infrared thermography axis temperature identification comprises the following steps:
step 1, taking down a detected composite insulator from an operation line, cleaning the surface of the composite insulator, putting the composite insulator into a boiling aqueous solution with certain concentration of sodium chloride for a poaching test, taking out a detected product after poaching for 42 hours, and measuring and recording the surface temperature of the detected product after the detected product is naturally cooled;
Step 2, proportionally applying power frequency voltage to the tested sample for 30 minutes;
Step 3, measuring the surface temperature of the test sample by using a thermal infrared imager, obtaining an infrared thermograph (shown in figure 2) after the composite insulator is pressurized, analyzing and processing data in the infrared thermograph to obtain a test sample axis temperature-length distribution curve, and analyzing the temperature distribution characteristics and identifying interface defects according to the temperature distribution curve;
Step 4, evaluating the interface performance of the tested product according to an interface defect identification criterion, wherein the interface defect identification criterion comprises the following steps:
identification criterion one, the heating segment with the temperature rising above 20K exceeds a certain length (such as but not limited to 10 cm);
according to the second identification criterion, a heating section with the temperature rise reaching 40K appears;
In this example, a certain sample in fig. 2 is selected for interface defect identification, a region where the sample is located is found in an infrared thermograph, a temperature value of each pixel point in the region is extracted, a maximum radial temperature value at each axial position is selected along the axial direction of the sample and is used as the temperature at the axial position, and then an axial temperature-length distribution curve (as shown in fig. 3) corresponding to the infrared thermograph of the sample is obtained by taking one end of a pressurizing section of the sample as a starting point, the axial length as a horizontal coordinate, and the temperature at the axial position as a vertical coordinate;
the characteristic parameters of the axial temperature-length distribution curve are defined as follows:
1) a heating section: respectively taking 20K and 40K as temperature rise reference values, adding the temperature rise reference value to the surface temperature of the sample before pressurization to obtain corresponding temperature reference values, taking each temperature reference value as a vertical coordinate, making a horizontal line on an axis temperature-length distribution curve, and defining the part of the curve above the horizontal line as a heating section;
2) heating section position: the abscissa x of the center of the heating segment;
3) length of heat generating segment: the difference of the horizontal coordinates between the head and the tail of the heating section;
4) maximum temperature of the heating section: a longitudinal coordinate y of a peak point appearing in the heating section;
obtaining characteristic parameters on an axis temperature-length distribution curve:
1) a heating section: before pressurizing, the surface temperature of the sample is 3 ℃, so that 23 ℃ and 83 ℃ are respectively used as vertical coordinates, two horizontal lines are made on an axis temperature-length distribution curve, and 5 heating sections with the temperature rise over 20K and 4 heating sections with the temperature rise over 80K are obtained;
2) heating section position: the positions of the 5 heating sections with the temperature rise exceeding 20K are respectively 10.3cm, 36.8cm, 43.5cm,47.4cm,53.9cm and 64.5cm, and the positions of the heating sections with the temperature rise exceeding 40K are respectively 13.2cm, 51.2cm, 53.8cm and 58.6 cm;
3) Length of heat generating segment: the lengths of 5 heating sections with the temperature rise exceeding 20K are respectively 9.0cm, 7.7cm, 4.5cm, 3.2cm, 8.4cm and 11.6cm, and the lengths of 4 heating sections with the temperature rise exceeding 40K are respectively 7.1cm, 2.6cm, 2.6cm and 1.9 cm;
4) maximum temperature of the heating section: the maximum temperatures of 5 heating sections with the temperature rise exceeding 20K are respectively 87.5 ℃, 44.9 ℃, 29.1 ℃, 33.4 ℃, 59.2 ℃ and 52.5 ℃, and the maximum temperatures of 4 heating sections with the temperature rise exceeding 80K are respectively 87.5 ℃, 44.9 ℃, 59.2 ℃ and 52.5 ℃;
and evaluating the interface performance of the tested product according to an interface defect identification criterion, wherein the heating section with the position of 64.5cm and the temperature rise of more than 20K and the heating section with the position of 13.2cm, 51.2cm, 53.8cm and 58.6cm and the temperature rise of more than 40K have serious interface defects, the test product is damaged in a steep wave front impact voltage test, and fig. 4 shows that the heating section with the position of 13.2cm and the temperature rise of more than 40K is damaged, and the result shows that the sampling inspection strength is increased for the batch of products where the composite insulator is located, and the batch of in-transit composite insulators are considered to be replaced.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (4)
1. a composite insulator interface defect identification method based on infrared thermal image axis temperature identification is characterized in that based on an axis temperature-length distribution curve, the curve is defined as follows:
Defining one heating segment: respectively taking 10K and 40K as temperature rise reference values, adding the temperature rise reference value to the surface temperature of the sample before pressurization to obtain corresponding temperature reference values, taking each temperature reference value as a vertical coordinate, making a horizontal line on an axis temperature-length distribution curve, and defining the part of the curve above the horizontal line as a heating section;
defining the position of a second heating section: the abscissa x of the center of the heating segment;
defining three, heating segment length: the difference of the horizontal coordinates between the head and the tail of the heating section;
defining four, maximum temperature of the heating section: a longitudinal coordinate y of a peak point appearing in the heating section;
the method comprises the following steps:
step 1, taking down a detected composite insulator from an operation line, cleaning the surface of the composite insulator, putting the composite insulator into a boiling sodium chloride aqueous solution for a water boiling test, taking out a detected product after the composite insulator is boiled for a set time, and measuring and recording the surface temperature of the detected product after the detected product is naturally cooled;
Step 2, proportionally applying power frequency voltage to the tested sample, and continuously setting time in the pressurizing process;
step 3, measuring the surface temperature of the test sample by using a thermal infrared imager, obtaining an infrared thermograph after the composite insulator is pressurized, analyzing and processing data in the infrared thermograph to obtain an axial temperature-length distribution curve of the test sample, and identifying interface defects according to the axial temperature-length distribution curve, wherein the specific method for obtaining the axial temperature-length distribution curve comprises the following steps of:
Step 301, finding a region where a test article is located in an infrared thermograph, extracting a temperature value of each pixel point in the region, and selecting a maximum temperature value in the radial direction of each axial position along the axial direction of the test article as the temperature of the axial position;
Step 302, taking one end of a test sample pressurizing section as a starting point, taking the axial length as a horizontal coordinate, and taking the temperature at the axial position as a vertical coordinate to obtain an axial temperature-length distribution curve of the test sample;
Step 4, evaluating the interface performance of the tested product according to an interface defect identification criterion, wherein the interface defect identification criterion comprises the following steps:
according to the first identification criterion, the heating section with the temperature rising above 20K exceeds a set length;
and according to a second identification criterion, a heating section with set temperature rise is formed.
2. the method for identifying the interface defects of the composite insulator based on the infrared thermographic axis temperature identification according to claim 1, wherein in the step 1, the conductivity of the sodium chloride solution is 1670 μ S/cm to 1830 μ S/cm at 20 ℃.
3. The method for identifying the interface defects of the composite insulator based on the infrared thermographic axis temperature identification according to claim 1, wherein the length selected in the third definition is 0.5-1.2 m, and the effective value of the power frequency voltage added in the step 2 is 200-300 kV/m.
4. the method for identifying the interface defects of the composite insulator based on the infrared thermographic axis temperature identification according to claim 1, wherein if the detected product meets any one of the two criteria of the step 4, the detected product can be regarded as having serious interface defects.
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| CN111024753A (en) * | 2019-12-27 | 2020-04-17 | 广东电网有限责任公司电力科学研究院 | Method, device and equipment for detecting internal defects of composite insulator and storage medium |
| CN111398339B (en) * | 2020-03-26 | 2022-08-30 | 国网浙江省电力有限公司电力科学研究院 | Method and system for analyzing and judging heating defects of composite insulator of on-site overhead line |
| CN111965214B (en) * | 2020-07-09 | 2023-05-16 | 国网浙江省电力有限公司电力科学研究院 | Method and system for judging heating defect of composite insulator of overhead line |
| CN113484635A (en) * | 2021-06-17 | 2021-10-08 | 海南电网有限责任公司电力科学研究院 | Insulator abnormal heating heat source and material degradation characteristic analysis method thereof |
| CN116106705B (en) * | 2023-04-12 | 2023-07-11 | 中国空气动力研究与发展中心低速空气动力研究所 | Plasma exciter real-time monitoring device and method for unmanned aerial vehicle flight verification |
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Effective date of registration: 20231204 Address after: No. 23 Hairuihou Road, Longhua District, Haikou City, Hainan Province, 571100 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF HAINAN POWER GRID Co.,Ltd. Patentee after: Hainan Electric Power Industry Development Co.,Ltd. Address before: 570311 Hai Rui Road, Longhua District, Haikou, Hainan Province, No. 23 Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF HAINAN POWER GRID Co.,Ltd. |