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长空气间隙负极性操作冲击放电特性研究(I)—试验研究

DOI: 10.13334/j.0258-8013.pcsee.2014.21.018, PP. 3534-3540

Keywords: 负极性操作冲击电压波,长空气间隙,棒-棒间隙,棒-板间隙,棒-线间隙,50%放电电压

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Abstract:

长空气间隙在负极性操作冲击电压下具有非线性放电特性。为了研究典型长空气间隙的负极性放电特性,利用7500kV冲击电压发生器产生20/2500μs和80/2500μs两种负极性操作冲击电压波,开展了间隙距离为1~10m的棒-棒间隙、棒-板间隙和棒-线间隙的负极性放电特性试验研究,并与其他学者的试验结果进行对比分析。试验结果表明:随着间隙长度的增加,棒-棒间隙、棒-板间隙、棒-线间隙的50%放电电压都趋于饱和,但棒-板间隙的饱和趋势最为明显;当间隙长度为4m时,棒-板间隙与棒-棒间隙的50%放电电压大小关系发生翻转;间隙的平均击穿场强随着间隙距离的增大而减小。该研究揭示了1~10m长空气间隙的负极性操作冲击放电特性,加深了对长空气间隙放电特性的认识。

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