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雷电诱发500kV变电站5台电流互感器故障分析

DOI: 10.13336/j.1003-6520.hve.2015.05.019, PP. 1558-1565

Keywords: 架空输电线路,变电站,雷电,过电压,避雷器计数器,电流互感器故障,可能性分析

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Abstract:

为分析某500kV变电站5台电流互感器故障是否可能因雷电过电压激发而产生,针对故障时站内避雷器放电计数器均未动作的情况,分析了避雷器的动作特性,搭建了线路及变电站雷电过电压计算模型,研究了雷击导线及杆塔时可触发避雷器放电计数器动作的最小雷电流幅值与传导距离的关系,计算了雷击杆塔时传导至变电站各故障点的过电压幅值。研究结果表明雷击导线及杆塔时,可触发变电站避雷器放电计数器动作的最小雷电流幅值与传导距离基本都呈线性关系;雷击杆塔时,导线上感应到的过电压难以触发变电站避雷器放电计数器动作,而相比之下,绕击导线时则容易的多;当雷击杆塔时,雷击处三相导线均感应出过电压,传导至变电站时,即使线路间隔装设有避雷器,故障电流互感器承受的过电压最高仍可高达666kV。如果5台故障设备此前均已存在绝缘缺陷时,有可能在此过电压的激发下加速故障过程。

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