Insulation Defect Detection Method of Composite Insulator Based on Infrared Accurate Temperature Measurement
A composite insulator, accurate temperature measurement technology, applied in the direction of material thermal development, to achieve the effect of improving detection efficiency, reducing false positive rate, and improving accuracy rate
Active Publication Date: 2017-08-25
STATE GRID CORP OF CHINA +1
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There is a certain proportion of misjudgments in the current on-site inspection, and the requirements and judgment methods of on-site inspection need to be further improved
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[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0033] Composite insulator insulation defect detection method based on infrared precise temperature measurement,
[0034] When detecting three-phase or double-string composite insulators in the same tower, the method steps for judging whether there is an insulation defect in the composite insulator by using the infrared temperature measurement image taken by the infrared thermal imager are as follows:
[0035] (1) According to the different temperatures represented by different colors in the thermal image, judge whether there is an abnormal heating part on the composite insulator. If there is no abnormal heating part, it is considered that the equipment is normal. If there is an abnormal heating part, go to step (2);
[0036] (2) Compare the temperature difference between the highest temperature of the abnormal heating part and the ambient temperature, ...
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Abstract
The invention discloses a composite insulator insulation defect detection method based on infrared precise temperature measurement. According to the different temperatures represented by different colors in the thermal image, it is judged whether there is an abnormal heating part on the composite insulator. If there is no abnormal heating, the equipment is considered normal. , if there is an abnormal heating part, compare the temperature difference between the maximum temperature of the abnormal heating part and the ambient temperature, if it is greater than the set temperature threshold C, C>1, then the composite insulator has an insulation defect, if it is less than the set temperature threshold C, C >1, and then compare the same type, and compare and analyze the temperature difference of the corresponding part of the same tower three-phase or same-phase double-string composite insulator. The temperature difference at this time refers to the highest temperature point of the corresponding part of the three-phase or double-string composite insulator thermal image If the temperature difference is less than 1K, the equipment is considered to be normal. When the temperature difference is greater than 1K, go to the tower for retesting. The method improves the detection efficiency of the composite insulator, and improves the accuracy of judging the insulation defect of the composite insulator.
Description
technical field [0001] The invention relates to the field of live detection of composite insulators, in particular to a composite insulator insulation defect detection method for 500kV line composite insulator fault detection based on infrared precise temperature measurement. Background technique [0002] Since 2008, five 500kV transmission line composite insulator fracture accidents have occurred in Shandong Power Grid, including one in 2008, three in 2011, and one in 2012. There are different degrees of cracks and puncture holes, and the fracture surface of the mandrel is irregular and broom-shaped. It is in a common fracture state of the mandrel, not brittle. The analysis shows that there are defects in the internal insulation of the conductor side of the composite insulator. In order to ensure the safe operation of transmission lines, it has become one of the urgent problems to be solved by adopting simple and effective detection methods to find the internal insulation d...
Claims
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IPC IPC(8): G01N25/20
Inventor 刘嵘沈庆河胡晓黎雍军郑建段玉兵
Owner STATE GRID CORP OF CHINA