Electric stress computations for designing a novel unibody composite cross-arm using finite element method

Jahangiri, Tohid; Wang, Qian; Bak, Claus Leth; Silva, Filipe Miguel Faria da; Skouboe, Henrik

doi:10.1109/tdei.2017.006802

Cited by 23 publications

(12 citation statements)

References 15 publications

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“…1, and they are potential locations to install line surge arresters. An alternative of two conductors downwards inside the cross-arms and pylon body to ground is being considered and studied in [2], but it is not be addressed in present paper. Out of economic and aesthetic considerations, a scheme where not all pylons are grounded is desirable and investigated in this paper, which is called 'partially grounded transmission lines' (PGTLs).…”

Section: Introductionmentioning

confidence: 99%

Backflashover Performance Evaluation of the Partially Grounded Scheme of Overhead Lines With Fully Composite Pylons

Zhang

Wang

Silva

et al. 2022

IEEE Trans. Power Delivery

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A design of a fully composite pylon has been proposed for new-generation 400 kV transmission towers to save line corridors and to reduce visual impact. Correspondingly, a method of external down-leads is proposed to bring grounding potential to the shield wires, together with a plan that not all pylons are grounded called 'partially grounded transmission lines' (PGTLs). This paper investigates backflashover performance of a partial grounding scheme of overhead lines (OHLs) supported by composite pylons. The transient analysis was carried out in PSCAD based on Monte Carlo method. For OHLs with every pylon grounded, reducing footing resistance and soil resistivity can improve backflashover performance effectively, but for PGTLs, these two methods do not have obvious effect and increasing insulation distance has limited effect. When lightning strikes at PGTLs, overvoltage is mainly dependent on the distance to the nearest grounded pylon and a longer distance will cause overvoltage with larger amplitude and longer wave front duration. Therefore, backflashover rate also increases along with the distance to the nearest grounded pylon until reaching a value limited by the inceptive condition of flashover. A coefficient recommended by CIGRE TB 63 to estimate backflashover rate is discussed and modified when using in PGTLs.

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Section: Introductionmentioning

confidence: 99%

Backflashover Performance Evaluation of the Partially Grounded Scheme of Overhead Lines With Fully Composite Pylons

Zhang

Wang

Silva

et al. 2022

IEEE Trans. Power Delivery

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“…For the big load-bearing closed fixtures which require a weight of less than 20 kg and a strength of more than 200 kN, this type of application is scarce, so a new layer structure needs to be exploited for the carbon fiber closed fixture. To assess the strength of carbon fiber members quickly and accurately, the progressive damage strength analysis method is employed [16][17][18] as the finite element strength analysis method of carbon fiber members, and Tsai-Wu strength theory is preferred as the strength judgment. At present, the most commonly used strength theories are Hoffman strength theory, Tsai-Hill strength theory, and Tsai-Wu strength theory [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Structural Design and Mechanical Performance Analysis of Carbon Fiber Closed Fixtures for UHV Transmission Lines

Zhang

Yan

Huang

et al. 2021

Mathematical Problems in Engineering

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The closed clamp is a standard tool for the insulator replacement in ultrahigh voltage (UHV) transmission lines, which is mainly made of titanium alloy material and weighs more than 27 kg that greatly reduces the working efficiency for operators. Due to the lightweight demand, carbon fiber composite materials are applied to design a new type of clamp, in which mechanical properties of new fixtures need to be fulfilled while considering poor impact resistance and low interlaminar shear strength of carbon fiber composite materials. To excavate a high-strength ply structure, finite element progressive damage strength analysis is employed to evaluate the mechanical properties of three different ply angles of the carbon fiber closed fixture, in which Tsai–Wu strength theory is thought as the strength judgment basis for carbon fiber composite materials. After comparison with the displacement-load curves, the three different ply angles fail to meet the strength requirements. So, a carbon fiber laminate structure with an outer cladding for carbon fiber closed fixtures is raised and verified. The analysis results show that the laminate structure meets the strength requirements. Destructive test of the new closed clamp is conducted to verify the correctness of the proposed method, and the weight is reduced by 36.46%.

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“…The authors have highlighted the challenge posed by different pore sizes that caused variation in permittivity and volume resistivity of the material, thus influencing the electrical stress distribution. The finite element method (FEM) has been widely used to evaluate the stress distribution on composite crossarms and insulators in the event of lightning [ 16 , 17 , 18 , 19 ]. These studies have satisfactorily predicted and located the electrical stress by its potential and E-field distributions.…”

Section: Introductionmentioning

confidence: 99%

The Behavior of Polyurethane Foam-Filled Glass-Fiber-Reinforced Polymer Crossarm Subjected to Lightning Transient Voltage

et al. 2021

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The demand for composite materials in high-voltage electrical insulation is escalating over the last decades. In the power system, the composite glass-fiber-reinforced polymer has been used as an alternative to wood and steel crossarm structures due to its superior properties. As a composite, the material is susceptible to multi-aging factors, one of which is the electrical stress caused by continuous and temporary overvoltage. In order to achieve a better insulation performance and higher life expectancy, the distribution of the stresses should firstly be studied and understood. This paper focuses on the simulation work to better understand the stress distribution of the polyurethane foam-filled glass-fiber-reinforced polymer crossarm due to the lightning transient injection. A finite-element-based simulation was carried out to investigate the behavior of the electric field and voltage distribution across the sample using an Ansys Maxwell 3D. Electrical stresses at both outer and inner surfaces of the crossarm during the peak of lightning were analyzed. Analyses on the electric field and potential distribution were performed at different parts of the crossarm and correlated to the physical characteristics and common discharge location observed during the experiment. The results of the electric field on the crossarm indicate that both the outer and internal parts of the crossarm were prone to high field stress.

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Electric stress computations for designing a novel unibody composite cross-arm using finite element method

Cited by 23 publications

References 15 publications

Backflashover Performance Evaluation of the Partially Grounded Scheme of Overhead Lines With Fully Composite Pylons

Backflashover Performance Evaluation of the Partially Grounded Scheme of Overhead Lines With Fully Composite Pylons

Structural Design and Mechanical Performance Analysis of Carbon Fiber Closed Fixtures for UHV Transmission Lines

The Behavior of Polyurethane Foam-Filled Glass-Fiber-Reinforced Polymer Crossarm Subjected to Lightning Transient Voltage

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