Non-destructive analysis of power insulators by frequency response function and three dimensional-computed tomography

Kim, Tae-Yong; Sanyal, Simpy; Rabelo, Matheus; Choi, In Sil; Yoon, Young-Geun; Oh, Tae Keun; Yi, Junsin

doi:10.1016/j.ymssp.2022.109310

Cited by 3 publications

(2 citation statements)

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“…For instance, under specified operating voltages, lightning overvoltages, and internal overvoltages, an insulator should not experience a breakdown or surface flashover. Similarly, under specified long-and short-term mechanical loads, they should not suffer damage or destruction [5][6][7][8][9]. Damaged insulators in operation can cause failures in the entire transmission line, affecting the normal functioning of the power system and posing serious threats to the safety of residents and property around the transmission lines.…”

Section: Introductionmentioning

confidence: 99%

“…Coupled with 3D computed tomography (3D-CT) for fault analysis, the method detected the insulator's voids and cracks. In published reports, various non-destructive techniques (NDT) were employed for diagnosing defects in insulator components [9]. Liu et al proposed an improved model based on YOLO for detecting insulator faults in aerial images against complex backgrounds [23].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

Ji,

Li,

Cao

et al. 2024

Materials

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This study aims to enhance the productivity of high-voltage transmission line insulators and their operational safety by investigating their failure mechanisms under ultimate load conditions. Destructive tests were conducted on a specific type of insulator under ultimate load conditions. A high-speed camera was used to document the insulator’s failure process and collect strain data from designated points. A simulation model of the insulator was established to predict the effects of ultimate loads. The simulation results identified a maximum first principal stress of 94.549 MPa in the porcelain shell, with stress distribution characteristics resembling a cantilever beam subjected to bending. This implied that the insulator failure occurred when the stress reached the bending strength of the porcelain shell. To validate the simulation’s accuracy, bending and tensile strength tests were conducted on the ceramic materials constituting the insulator. The bending strength of the porcelain shell was 100.52 MPa, showing a 5.6% variation from the simulation results, which indicated the reliability of the simulation model. Finally, optimization designs on the design parameters P1 and P2 of the insulator were conducted. The results indicated that setting P1 to 8° and P2 to 90.062 mm decreased the first principal stress of the porcelain shell by 47.6% and Von Mises stress by 31.6% under ultimate load conditions, significantly enhancing the load-bearing capacity. This research contributed to improving the production yield and safety performance of insulators.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

Ji,

Li,

Cao

et al. 2024

Materials

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A Review: Application of Terahertz Nondestructive Testing Technology in Electrical Insulation Materials

Guo¹,

Xu²,

Cai³

et al. 2022

IEEE Access

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As the voltage level of the grid continuously rises, more and more new insulating materials with better performance are put into use. Nevertheless, air gaps often appear in insulating materials due to poor material quality, structural design flaws, etc. High-field-strength air gaps will produce partial discharge or even breakdown, resulting in electrical equipment failure. In addition, during operation, organic insulating materials are simultaneously exposed to high temperatures, mechanical stress, electrical stress, and moisture. Consequently, aging is inevitable. The aging of insulation materials is the root cause of the reduced insulation properties of the degradation of the insulation properties of electrical equipment in long-term operation. In order to improve the safety performance of power equipment and assure the safety of power grids, the detection and identification of internal structural defects and aging states of insulating materials have always been hot issues in related fields. However, structural defects inside the insulation materials used in power equipment, which are tiny (microns to millimeters), are exceedingly challenging to detect. While there are various destructive methods for detecting the aging status, non-destructive in-line inspection methods are still less commonly reported. In recent years, some scholars have begun to try to use terahertz spectroscopy to detect insulating materials. Numerous scholars have discovered that terahertz spectroscopy can not only detect structural defects inside insulating materials but can also detect nondestructive testing on the degree of material aging and even the type of material, which has excellent engineering value and promotion prospects. In order to help relevant researchers understand the application of this emerging technology in the field of insulating materials, this paper reviews the basic principles of terahertz detection and its applications in air gap detection, moisture detection, and aging analysis of insulating materials. Existing problems and future development directions are discussed.

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A Sensitivity Map Deformation Method for Image Quality Improvement of Ultrasonic Tomography

Hu,

Qin,

et al. 2024

IEEE Sensors J.

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Non-destructive analysis of power insulators by frequency response function and three dimensional-computed tomography

Cited by 3 publications

References 30 publications

Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

Study on the Ultimate Load Failure Mechanism and Structural Optimization Design of Insulators

A Review: Application of Terahertz Nondestructive Testing Technology in Electrical Insulation Materials

A Sensitivity Map Deformation Method for Image Quality Improvement of Ultrasonic Tomography

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