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交联聚乙烯电力电缆电树枝生长的混沌特性分析

, PP. 63-69

Keywords: 交联聚乙烯电缆,电树枝,局部放电,混沌,分形维

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Abstract:

采用实际的XLPE电缆作为试验样品,以针尖模拟电场应力的集中,开展了工频12~21kV电压和常温到70℃下的电树枝化试验;引入了混沌理论分析电树枝生长的过程,并以电树枝局部放电单位时间内的最大放电量和总放电量作为分析对象,结合电树枝的生长的物理机理,分析了电树枝生长的混沌特征。结果显示XLPE电缆电树枝的生长过程具有确定性混沌特性,电树枝混沌特征的最大Lyapunov指数和关联分形维数值表现出随树枝分形维数的增大而减小的趋势。

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