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Infrared accurate temperature measurement-based composite insulator insulation defect detection method

A technology for composite insulators and accurate temperature measurement, which is applied in the direction of material thermal development, etc., to achieve the effect of improving accuracy, reducing misjudgment rate, and improving detection efficiency

Active Publication Date: 2015-06-17
STATE GRID CORP OF CHINA +1
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  • Application Information

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Problems solved by technology

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

Method used

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  • Infrared accurate temperature measurement-based composite insulator insulation defect detection method
  • Infrared accurate temperature measurement-based composite insulator insulation defect detection method
  • Infrared accurate temperature measurement-based composite insulator insulation defect detection method

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Embodiment Construction

[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 an infrared accurate temperature measurement-based composite insulator insulation defect detection method. The method comprises the following steps: whether a heating abnormity position exists on a composite insulator or not is determined according to different temperatures represented by different colors in a thermogram, an apparatus is normal if the heating abnormity position does not exist, a difference between the highest temperature of the heating abnormity position and ambient temperature is compared if the heating abnormity position exists, the composite insulation has an insulation defect if the difference is greater than a preset temperature threshold C (C is greater than 1), same kind comparison is carried out if the difference is smaller than the preset temperature threshold C (C is greater than 1), a temperature difference between positions corresponding to a three-phase or same-phase double-string composite insulator in a same tower is compared and analyzed and is a difference between the highest temperature points of corresponding positions in the thermogram of the three-phase or same-phase double-string composite insulator, the apparatus is normal if the temperature difference is smaller than 1K, and on-tower repeated measurement is carried out if the temperature difference is greater than 1K. The method improves the detection efficiency of the composite insulator, and improves the composite insulator insulation defect determination accuracy.

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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Application Information

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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
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