Electromagnetic and Thermal Analysis of a <scp>ZnO</scp> Element of Transmission‐Line Arrester for a Lightning Surge Current

Saito, Hiroki; Tanaka, Tokuya; Tosa, Ryohei; Baba, Yoshihiro; Shinjo, Kazuo

doi:10.1002/tee.23362

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…In this article, the voltage across a 77-kV TLSA and the heat in the TLSA are computed using the finite-difference time-domain (FDTD) method [3], which takes into account the heat conduction equation [4] in addition to the electromagnetic field as done in Refs. [5,6], for a high and long-duration lightning current. From the spatial and temporal distributions of FDTD-computed heat in the TLSA, the spatial and temporal distributions of thermal stress in the TLSA are computed using a software (Murata Software Femtet) based on the finite-element method (FEM) [7].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Electromagnetic Field, Heat and Thermal Stress of a Transmission Line Surge Arrester for Lightning Currents

Nishimura

Baba

Shinjo

2023

IEEJ Transactions Elec Engng

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The voltage across a 77‐kV‐class transmission line surge arrester (TLSA) and the heat in the TLSA have been computed using the finite‐difference time‐domain (FDTD) method for a lightning current having a magnitude of 50 kA, a risetime of 1 μs, and a half‐peak width of about 100 μs. The TLSA is represented with series‐connected‐nine ZnO elements, each of which has a length of 36 mm and a diameter of 32 mm. The ZnO element is represented with many 2 × 2 × 2 mm cubic cells, each of which has a nonlinear resistivity in each of the x‐, y‐, and z‐directions dependent on the electric field in each direction and the temperature in each cell. From the spatial and temporal distributions of FDTD‐computed heat in the TLSA, the spatial and temporal distributions of thermal stress in the TLSA have been computed using the finite‐element method. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Electromagnetic Field, Heat and Thermal Stress of a Transmission Line Surge Arrester for Lightning Currents

Nishimura

Baba

Shinjo

2023

IEEJ Transactions Elec Engng

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Simplified Thermal Computation of a Metal Oxide Varistor Element under a Lightning Impulse Current Injection

Tanaka

Baba

Tsujimoto³

et al. 2021

IEEJ Transactions Elec Engng

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A simple thermal computation procedure of a metal oxide varistor (MOV) element, in which an impulse current is injected, is presented. The heat in the MOV, composed of many small cells, is computed with the discretized heat transport equation. At each time step, the injected impulse current is assumed to be distributed uniformly in the MOV. The power per cell is computed from the instantaneous values of injected conduction current density and resultant electric field, the latter of which is obtained with an approximate expression of the nonlinear relation between conduction current density and electric field. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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Linear modeling analysis of the heat balance of the transmission line in high frequency critical ice melting state

Tan,

Liu,

Yuan

et al. 2024

International Journal of Low-Carbon Technologies

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The icing of transmission lines can cause many problems such as increased line load, unbalanced tension, and galloping, posing a serious threat to the reliable operation of the power system. Therefore, linear modeling analysis of the heat balance under a high-frequency critical ice melting state of transmission lines is studied. The thermal conduction states of melting, heating, twisting, rotating melting, and ice layer detachment of ice melting conductors are analyzed. Based on the heat conduction process of thermal melting of ice on transmission lines, a simplified calculation formula for thermal melting ice time is derived to calculate times for heating, ice layer torsion, and air gap increase. At the same time, based on the law of conservation of energy, thermodynamic boundary conditions for iced conductors were established and corresponding physical models were constructed. Based on this model, we conduct a linear modeling of the heat balance in the melting state in order to provide a more accurate prediction of temperature distribution. The experimental results show that there is a negative correlation between environmental temperature and critical melting current, and the melting time decreases with the increase of environmental temperature.

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Electromagnetic and Thermal Analysis of a ZnO Element of Transmission‐Line Arrester for a Lightning Surge Current

Cited by 3 publications

References 8 publications

Numerical Analysis of Electromagnetic Field, Heat and Thermal Stress of a Transmission Line Surge Arrester for Lightning Currents

Numerical Analysis of Electromagnetic Field, Heat and Thermal Stress of a Transmission Line Surge Arrester for Lightning Currents

Simplified Thermal Computation of a Metal Oxide Varistor Element under a Lightning Impulse Current Injection

Linear modeling analysis of the heat balance of the transmission line in high frequency critical ice melting state

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