An Optimized Infrared Detection Strategy for Defective Composite Insulators According to the Law of Heat Flux Propagation Considering the Environmental Factors

Cheng, Li; Liao, Ruijin; Yang, Lijun; Zhang, Fuzeng

doi:10.1109/access.2018.2854221

Cited by 25 publications

(17 citation statements)

References 16 publications

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“…The failure was repeated with the AC withstand voltage test under 318 kV, which equals to the 1.1 times of the operation voltage. The performance of these 3 insulators in the withstand voltage test is quite different from other heating insulators found in recent years [7,11,13]:…”

Section: Background and Withstand Voltage Testscontrasting

confidence: 60%

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Failure Analysis of “Lantern-Like” Composite Insulator Heating Defects and the Improved Dye Penetration Test Method

Huang

Wang

et al. 2021

IEEE Access

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In 2019, 27 new 500 kV AC composite insulators showed a severe heating, different from the traditional heating failure reported in recent years, the heating area isn't limited in the high voltage side and 3-5 discontinuous heating area appears in the middle part. It was named "Lantern-like" heating failure according to the shape of the heating area. With the withstand voltage test, absorption test, X ray micro-CT test and SEM analysis, The 3D structural imaging of the through channels in the rod has been achieved, which would change the electric field distribution significantly. Short internal through channels will change the electrical field distribution and provide the energy to the abnormally heating. To detect these potential channels which should be responsible for the abnormally heating in the rod, the test time of dye penetration test has been extended from 15 minutes to 2 hours, and the improved test methods can find the through channels easily but won't alert for the normal ones.

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Section: Background and Withstand Voltage Testscontrasting

confidence: 60%

“…In recent years, the composite insulators in China have repeatedly experienced abnormal heating, which has attracted the attention of many scholars [7][8][9]. It was generally believed that, the polarization effect of moisture or pollution should take responsibility for the abnormal heating in area with a high humidity [10].…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of “Lantern-Like” Composite Insulator Heating Defects and the Improved Dye Penetration Test Method

Huang

Wang

et al. 2021

IEEE Access

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“…As is generally known, silicone rubber (SiR) composite insulators have been widely used for their excellent insulation performance, hydrophobicity and bear pollution flashover properties in coastal power grid in China [1]. Many researches have been published on the spreading behaviors of droplet under different conditions [2], [3]. These investigations can be mainly divided into two categories: one concerns the dynamic mechanism of single water droplet distortion and breakup under different conditions, such as droplet static parameter and external environment; the other is the binary droplets coalescence under the effect of electric field and other factors.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of Droplets and Flashover Characteristics for CFD and Experimental Analysis on SiR Composites

Liu

Kong

et al. 2019

IEEE Access

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The dynamic mechanism of water droplet formation has recently drawn considerable attention in research and application toward silicon rubber composite insulators. This paper is aimed at numerical simulations and experiments on the dynamic mechanism of water droplet formation with different applied voltages and droplet distribution and induced surface discharges on the insulator surface under the impact of AC electric field. The computational fluid dynamics model and experimental setup of multiple droplets were established to analyze the dynamic behavior of droplets and flashover characteristics. The obtained results reveal that the fusion first occurs between larger size droplets and the fusion is hard to happen along with the rise of the fractal dimension (FD) of droplet distribution. The elongation of droplets merges with more droplets and finally affects the electric field distribution on the insulator surface. With the increase of FD, the maximum electric field intensity shows an increasing tendency. Meanwhile, the experimental results show that with the increase of electric field intensity, the droplet fusion phenomenon becomes more obvious, which is consistent with the simulation results. The flashover voltage on the surface of silicon rubber decreases with the decrease of the FD of droplets, indicating that the complexity of droplet distribution has a significant effect on the flashover voltage. INDEX TERMS Droplet elongation, flashover voltage, discrete droplet, sir composite, fractal dimension.

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“…Using hand-held infrared thermal imager to detect the thermal radiation of energized composite insulators at long distance or near distance is a common detection method. However, it is a type of passive detection method only for energized insulators with low detection accuracy.It is hard to find defective insulators according to existing infrared detection standards [14].…”

Section: Introductionmentioning

confidence: 99%

A Far-Field Evaluation Method for Interfacial Defects Existed in Composite Insulators Based on Transient Thermal Wave

et al. 2019

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The interfacial defect of composite insulators is common, which is majorly responsible for the fracture of insulators after the acid resistant core rod is used. Based on the active infrared detection method, the far-field evaluation method can effectively keep the operation safety of transmission lines by detecting subtle internal defects which are difficult to find by the traditional non-destructive detection methods. Above all, the propagation law of heat has been studied. The difference of the surface temperature between defective and reference area has been calculated when the thermal excitation meet the Dirac function. Second, the plate and short insulator samples with interfacial defects have been produced. The defects in plate samples could be easily distinguished by radiation quantity but not in insulators. In order to increase the resolution of experimental result, the derivate of the data has been further processed in the Logarithmic coordinate system. The difference between defective area and reference area has approximately enlarged 7 times and 1 mm defect in insulators, which is the smallest, could be distinguished. The detecting distance has been expanded from several millimeters to 50 centimeters which offers a possibility to the online application. Finally, according to the test results, a preliminary standard for thermal wave evaluation focused on the interfacial defects has been proposed.INDEX TERMS Composite insulators, interfacial defect, non-destructive evaluation, thermal wave, transmission lines.

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An Optimized Infrared Detection Strategy for Defective Composite Insulators According to the Law of Heat Flux Propagation Considering the Environmental Factors

Cited by 25 publications

References 16 publications

Failure Analysis of “Lantern-Like” Composite Insulator Heating Defects and the Improved Dye Penetration Test Method

Failure Analysis of “Lantern-Like” Composite Insulator Heating Defects and the Improved Dye Penetration Test Method

Dynamic Behavior of Droplets and Flashover Characteristics for CFD and Experimental Analysis on SiR Composites

A Far-Field Evaluation Method for Interfacial Defects Existed in Composite Insulators Based on Transient Thermal Wave

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