Identification of XLPE cable insulation defects based on deep learning

Zhou, Tao; Zhu, Xiaoyan; Yang, Haifei; Yan, Xuyang; Jin, Xuejun; Wan, Qing

doi:10.1016/j.gloei.2023.02.004

Cited by 9 publications

(4 citation statements)

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“…Defects may have a technological or operational nature of origin. Structural micro-heterogeneity of solid insulating materials is confirmed by effective methods [1][2][3][4]. All insulating materials at the micro level change shape under the influence of an electric field.…”

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confidence: 91%

Determination of the maximum mechanical stresses in the insulating material around a defect with a high dielectric permittivity in an electrostatic field

Palchykov

2024

Electrical Engineering & Electromechanics

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Introduction. All insulating macrohomogeneous solid materials change shape under the influence of an electric field. Problem. The presence of minor defects changes the distribution of an electric field and causes a significant concentration of mechanical stresses in a given section of the material, which, under certain circumstances, can cause partial or complete destruction of this material. Goal. The purpose of the work is to determine maximum mechanical stresses according to the von Mises criterion in insulating materials around defects with ionized air and water in an electrostatic field. Also, to analyze the influence of the following parameters on the indicated stresses: the location of the defect, the orientation angle of the semi-major axis of the defect cross-section, the ratio of semi-major and semi-minor axes, elastic and dielectric properties of the insulating material and the defect. Methodology. The study is based on the interrelated equations of electrostatics and structural mechanics for an isotropic piecewise homogeneous medium. The solution of these equations is obtained by the finite element method. Results. Graphs of dependences of maximum mechanical stresses on the ratio of semi-major and semi-minor axes of the ellipsoidal cross-section of the defect have been obtained. The minimum ratio of the greatest stresses in the insulating materials around the surface cracks and pores for ionized air has been 9.3 times for the maximum ratio of major and minor semi-axes of the cross-section of the defect considered in the work, which is 10. For a water defect, the similar ratio has been 2...5.6 times, increasing when the relative dielectric permittivity of the insulating material changes from 7 to 2. When Young’s modulus of the insulating material increases from 1 MPa to 100 GPa, the angles of the inclination of the linearized dependences of maximum mechanical stresses around bounded pores with ionized air (water) to the axis of the ratio of major and minor semi-axes of the defect cross-section have been increased by 35.9° (58.0°) and 18.6° (20.1°) at orientations of major semi-axes at angles of 0° and 45°, respectively. Originality. The numerical-field mathematical two-dimensional model has been developed for the first time, which consists of sequentially solved equations of electrostatics and structural mechanics, for the determination of the distribution of mechanical stresses in an insulating material with a liquid or gaseous defect. It has been established for the first time that the ratio of the elastic properties of the insulating material and the defect determines the angle of the inclination of the linearized dependence of the maximum mechanical stress to the axis of the ratio of major and minor semi-axes of the defect cross-section. Practical value. The types of defects that contribute to the aging of insulation materials under the combined action of an electric field and a stress field to the greatest extent have been established.

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confidence: 91%

Determination of the maximum mechanical stresses in the insulating material around a defect with a high dielectric permittivity in an electrostatic field

Palchykov

2024

Electrical Engineering & Electromechanics

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“…In order to further improve detection accuracy and enhance universality, it is necessary to develop an effective and practical method to ensure the reliability of the power cable system. The harmonic detection method is a newly emerging research perspective [22][23][24]. Most scholars conduct time-frequency analysis on the current signal of power equipment to obtain harmonic information reflecting equipment condition.…”

Section: Introductionmentioning

confidence: 99%

Defect Identification of XLPE Power Cable Using Harmonic Visualized Characteristics of Grounding Current

Wang,

Liu,

Huang

et al. 2024

Electronics

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This paper proposes an online monitoring and defect identification method for XLPE power cables using harmonic visualization of grounding currents. Four typical defects, including thermal aging, water ingress and dampness, insulation scratch, and excessive bending, were experimentally conducted. The AC grounding currents of the cable specimens with different defects were measured during operation. By using the chaotic synchronization system, the harmonic distortion was transformed into a 2D scatter diagram with distinctive characteristics. The relationship between the defect type and the diagram features was obtained. A YOLOv5 (you only look once v5) target recognition model was then established based on the dynamic harmonics scatter diagrams for cable defect classification and identification. The results indicated that the overall shape, distribution range, density degree, and typical lines formed by scatter aggregation can reflect the defect type effectively. The proposed method greatly reduces the difficulty of data analysis and enables rapid defect identification of XLPE power cables, which is useful for improving the reliability of the power system.

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“…Meanwhile, the thermoplastic insulating materials does not require cross‐linking and degassing in the process of cable production, which can significantly shorten the production cycle of the power cable and reduce the energy consumption of production [9]. The removing of cross‐linking process can also increase the purity of insulation, and enhance the insulating performance [10, 11], which is expected to further increase the power transmission capacity or reduce the designed thickness of power cable insulation.…”

Section: Introductionmentioning

confidence: 99%

Eco‐friendly polypropylene power cable insulation: Present status and perspective

Yang

et al. 2023

IET Nanodielectrics

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Environmental protection is the future trend of power equipment development, and is also a research hotspot in the field of power cable insulation in recent years. Due to the excellent electrical properties and recyclability, polypropylene (PP) based composites are regarded as promising insulating materials for eco‐friendly next‐generation power cables. However, the high modulus and hardness of pure PP make it difficult to be directly employed as cable insulations, which needs to be further optimised. General methods of mechanical performance regulation often result in the deterioration of electrical performance, such as breakdown strength, space charge and so on. Therefore, it is recognised that the major challenge impeding practical applications of PP power cable insulation arises from the synergetic regulation of multi‐performances. The multi‐level structures influencing the multi‐performances of PP are introduced by the authors and the researches on the performance enhancement of PP through nanoscale structure regulation in recent years are reviewed in detail. Seven kinds of modification methods including nano‐doping, chemical grafting, in‐suit copolymerisation, heat treatment, nucleating agent, voltage stabiliser and elastomer blending are paid special attention. Based on the full understanding of the research status, the challenges and issues of future research are put forward for eco‐friendly PP power cable insulation.

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Identification of XLPE cable insulation defects based on deep learning

Cited by 9 publications

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Determination of the maximum mechanical stresses in the insulating material around a defect with a high dielectric permittivity in an electrostatic field

Determination of the maximum mechanical stresses in the insulating material around a defect with a high dielectric permittivity in an electrostatic field

Defect Identification of XLPE Power Cable Using Harmonic Visualized Characteristics of Grounding Current

Eco‐friendly polypropylene power cable insulation: Present status and perspective

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