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特快速瞬态过电压作用下金属氧化物电阻片响应特性试验

DOI: 10.13334/j.0258-8013.pcsee.2015.13.029, PP. 3436-3442

Keywords: 金属氧化物电阻片(MOV),特快速瞬态过电压(VFTO),伏安特性,阻抗特性

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Abstract:

依据特高压气体绝缘的金属封闭式组合电器(gas-insulatedmetal-enclosedswitchgear,GIS)中特快速瞬态过电压(veryfasttransientovervoltage,VFTO)试验平台实测VFTO波形特征,确定金属氧化物电阻片(metaloxidevaristors,MOV)试验平台波形参数,设计搭建了电压波头时间为20ns的特快波前冲击电压试验回路,选取5种用于超/特高压的典型MOV作为样本,试验研究了MOV在电压波头时间为20ns、电流峰值范围在0.5~2.5kA特快波下的伏安特性。试验结果表明:与标准雷电冲击波下MOV残压相比,VFTO下MOV的残压上升约14.7%到18.2%;特快波前冲击电压作用下MOV存在一个阻抗转折电压U0,在U0电压下,MOV呈现阻性,当电压峰值小于U0时MOV呈现出容性阻抗特征,当电压峰值大于U0时MOV呈现出感性阻抗特征;U0/U1mA与MOV形状尺寸关系不大;MOV电压、电流同时响应,零点位置相同,电压与电流响应时间不存在延时效应,MOV即时响应。

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