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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“…In recent years, the booming of renewable energy such as wind and solar power [1] stimulated the demand for new transmission lines [2][3][4]. Meanwhile, such transmission lines will realize the transmission and distribution of electric energy by cross-border transmission in Europe to decrease the generation costs and curtail CO 2 emission [3,5].…”

Section: Introductionmentioning

confidence: 99%

“…It also benefits the component transportation and assembly in the process of construction. In addition to the economic advantages, this design embodies less visual impact with respect to the environmental impact [1,6].…”

Section: Introductionmentioning

confidence: 99%

The effect of frequency-dependent soil electrical parameters on the lightning response of a ‘Y’ shaped composite pylon for 400 kV transmission lines

et al. 2022

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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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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

The effect of frequency-dependent soil electrical parameters on the lightning response of a ‘Y’ shaped composite pylon for 400 kV transmission lines

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

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