Experimental investigation of internal defect detection of a 69-kV composite insulator

Koné, Gbah; Volat, Christophe; Ezzaidi, Hassan; Duvillaret, Lionel

doi:10.1109/eic.2016.7548708

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…Simultaneously, the environmental pollution issue is still outstanding, and the pollution induced flashover of transmission lines is still threatening the safety operation of power grid [1][2][3][4]. Composite insulators have been widely applied in transmission lines for their favourable resistance to pollution flashover [5,6]. Plenty of researches about flashover performance of composite insulators have been conducted at home and abroad, and the results have been applied in transmission lines for the purpose of promoting power system's stability [7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

AC flashover performance of different shed configurations of composite insulators under fan‐shaped non‐uniform pollution

et al. 2018

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Currently, it is founded that under unidirectional wind and certain landform, composite insulators are always fanshaped non-uniformly polluted. In this paper, artificial pollution tests on three types of composite insulators with different shed configurations and under various fan-shaped non-uniform pollution conditions were carried out. Then the flashover performances of composite insulators, porcelain insulators and glass insulators were compared. Results indicate that there is a big difference between ac flashover performance of composite insulators under non-uninform pollution and uninform pollution. The flashover voltage of composite insulator is largely influenced by salt deposit density (SDD), the ratio of SDD of windward side to leeward side (W/L), the occupation ratio of leeward side k and the shed configurations. The relationship between SDD and U 50 still meets negative power function when composite insulator is fan-shaped non-uninform polluted. There is a reduction of 17.8-27.6% in the flashover strength when the ratio W/L of SDD decreases from 1/1 to 1/15. The shed configurations of composite insulators have great effects on the flashover performance. Composite insulators always have better withstand property compared to glass and porcelain insulators under either uniform pollution or fan-shaped non-uniform pollution.

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Section: Introductionmentioning

confidence: 99%

AC flashover performance of different shed configurations of composite insulators under fan‐shaped non‐uniform pollution

et al. 2018

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“…Meanwhile a channel composed of many short air gap has been found in the middle of sample 2# (see Fig 6a),the diameter of the through hole is 350 μm. When there was a through channel existed in the rods, even if a slightly water intrusion at the end fitting (it can be proved by the dissection results of end fitting) will change the electric filed distribution and cause a serious heating [ [19][20][21]]. To explain the impacts of the through channel on the electrical field distribution, a 3D insulator-tower-line model has been built (Fig.…”

Section: Micro-structure Analysis For Rodsmentioning

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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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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“…Considerable research efforts have been devoted to the detection of composite insulation internal defects, such as electromagnetic wave detection [7], electric field distribution method [8], traditional ultrasonic technique [9, 10], and infrared imaging [11]. The same essence of these methods is to detect the macroscopic air gaps (millimetre scale) inside the defective interface.…”

Section: Introductionmentioning

confidence: 99%

Non‐destructive testing method of micro‐debonding defects in composite insulation based on high power ultrasonic

et al. 2019

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It is crucial to ensure the adhesive quality of the interface in composite insulation equipment for power grid security. Due to viscoelasticity of silicone rubber and roughness of interface, the thickness of the local air layer in the defective interface is <100 μm. This kind of defect is called micro-debonding defect in this paper, and it is significantly smaller than the millimetrescale air gaps which could be defected by the x-ray, THz, and traditional ultrasonic method. It remains challenging to detect the micro-debonding in composite insulation by non-destructive testing methods. In this paper, the acoustic model and bi-linear stiffness model for micro-debonding in different stages are established. Accordingly, a conjecture is proposed that the bonding property of composite insulation is related to the acoustic impedance of interface and non-linear distortion of its constitutive relation. The result obtained from numerical simulation with and without defect is compared with the high-power ultrasonic experimental data to validate the correctness of the theoretical model. In addition, it can be concluded that the non-linear distortion of high-power ultrasonic wave can be effectively used to diagnose micro-debonding defect at the interface of composite insulation in its early stage (1-20 μm).

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Experimental investigation of internal defect detection of a 69-kV composite insulator

Cited by 6 publications

References 7 publications

AC flashover performance of different shed configurations of composite insulators under fan‐shaped non‐uniform pollution

AC flashover performance of different shed configurations of composite insulators under fan‐shaped non‐uniform pollution

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

Non‐destructive testing method of micro‐debonding defects in composite insulation based on high power ultrasonic

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