Optimal design of high voltage composite insulators with grading rings in different configurations

Hussain, Mohammed Khalil; Alshadeedi, Bajel Mohammed

doi:10.1016/j.epsr.2023.109493

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…Previous studies have extensively examined the properties of insulators from various perspectives, including electrical and dynamic characteristics [27][28][29][30][31][32][33]. However, a notable research gap exists regarding the investigation of stress distribution within insulator components under ultimate loading conditions.…”

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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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%

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

Ji,

Li,

Cao

et al. 2024

Materials

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“…In HVTLs, the nonuniform E-fields are unavoidable; this phenomenon has drawn a lot of interest [4,5]. The calculations of the E-field and potential distribution along nonceramic insulators considering the influences of conductors, transmission towers, and grading ring impacts have been performed by a lot of investigators [6][7][8][9][10][11][12][13][14][15][16][17][18]. Since there is no constant design norm for grading rings, some authors have tried to design acceptable grading-ring configuration parameters for a specified device voltage.…”

Section: Introductionmentioning

confidence: 99%

“…Paper [10] used a grading ring at the HV end accessories to improve the E-field vs. potential distributions and then to minimize the corona discharges of a 230 kV composite insulator of HV OHTLs. The modeling and optimization of the grading ring dimensions' impact on high-voltage composite insulators using FEM were investigated also in [13].…”

Section: Introductionmentioning

confidence: 99%

“…In that case, the physical modeling problem was solved with exceedingly small meshes, which could be used to improve the efficiency of the field computations [20]. The finite element solution is especially useful for fields with multiple dielectrics; it is also one of the most effective numerical methods for addressing electrostatic domain issues since it covers the domain discretization based on the estimated number of field distributions [13]. It is a simpler method that is also well suited to situations with a complex geometry.…”

Section: Introductionmentioning

confidence: 99%

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Case Study: Optimizing Grading Ring Design for High Voltage Polymeric Insulators in Power Transmission Systems for Enhanced Electric Field and Voltage Distribution by Using a Finite Element Method

Aziz,

Aouabed,

Abdellah

et al. 2023

Energies

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This research paper aims to investigate the optimal design of grading rings for high-voltage polymeric insulators in an actual power transmission system, with a focus on improving the electrical representation of the insulator strings. One such subsidiary accessory commonly used with porcelain and polymer insulator strings is the grading ring, which is employed to improve the electric field and voltage distribution surrounding the insulator string. The efficiency of insulator strings can be enhanced by grading rings, as they facilitate a more linear potential division along the strings. The design parameters of grading rings significantly influence their performance on insulator strings. In this study, we examine the optimal design of the grading rings of high-voltage polymer insulators, since no uniform design methodology has been developed for high-voltage polymer insulators, and their optimization is currently the subject of many research studies. The electric field on an outdoor polymeric insulator is examined using finite element method (FEM) software and COMSOL Multi-Physics program. A 2D model is utilized to simulate a 220 kV polymeric insulator. The effectiveness of high-voltage polymeric insulators greatly depends on the dimensions and locations of the grading rings. Therefore, the impacts of the radius of the grading ring and that of its tube and the tube’s vertical position are thoroughly investigated, under dry and humid conditions. To achieve this objective, a search algorithm is employed to adjust the dimensions and locations of the grading ring. The optimization approach in this study is based on determining the maximum electric field across the insulator surface, while ensuring that it remains below the corona initiation level.

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Breakdown mechanism of RTV silicone rubber coated insulators under steep-front impulse voltage

Deng,

Wang,

Liu

et al. 2023

Electric Power Systems Research

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Optimal design of high voltage composite insulators with grading rings in different configurations

Cited by 7 publications

References 11 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

Case Study: Optimizing Grading Ring Design for High Voltage Polymeric Insulators in Power Transmission Systems for Enhanced Electric Field and Voltage Distribution by Using a Finite Element Method

Breakdown mechanism of RTV silicone rubber coated insulators under steep-front impulse voltage

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