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Current distribution in MOV element stressed by 4/10 μs impulse current

机译:MOV元件的电流分布应强调4/10μs脉冲电流

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This study focuses on current distribution in a metal oxide varistor (MOV) element stressed by 4/10 μs impulse current studied using the finite-difference time-domain (FDTD) method. After 100 kA shots, V1mA/mm values, which indicate deterioration of nonlinear characteristics of MOV, in edge parts of MOV elements decreased more than those in center parts. FDTD analysis was conducted in two ways, namely 1-D and 3-D models. The varistor is represented with many nonlinear cubic cells of 3 mm × 3 mm 0× 3 mm It turns out from the 3-D FDTD analyses that the skin effect is insignificant for a lightning current having a rise time of 4 μs. However, if there is small difference in the nonlinear characteristic of a ZnO element between its periphery and other parts, the distributions of current density are considerably affected, which may result in enhanced degradation of a varistor element in its periphery.
机译:该研究专注于使用有限差差时域(FDTD)方法研究的4/10μs脉冲电流的金属氧化物变阻器(MOV)元件中的电流分布。在100 kA射击之后,V1mA / mm值表示导致非线性特性的劣化,在MOV元件的边缘部分中的边缘部分比中心部件的边缘部分降低。 FDTD分析以两种方式进行,即1-D和3-D型号进行。压敏电阻由3mm×3mm 0×3mm的许多非线性立方单元表示,它从3-d FDTD分析中掉,即皮肤效果对于具有4μs的上升时间的雷电电流是微不足道的。然而,如果在其周边和其他部分之间的ZnO元件的非线性特性差异,则电流密度的分布显着影响,这可能导致压阻器元件在其周边的劣化。

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