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针对配电网绝缘永久性故障前发生的瞬时性故障产生的零模电流信号进行研究,提取了2个特征量用来表征瞬时性故障的严重程度.首先,将信号通过HHT技术处理分解成高低频分量,把7个周波时间窗口内的高低频能量比作为第一个故障特征量;通过对暂态信号位置的确定,提取出一个周波时间窗口的暂态信号的多尺度样本熵,并将其作为为第2个故障特征量.其次,对2个特征量进行历史统计分析,划定出二维特征分布图的轻微、中等和严重故障区域,以此来判别瞬时故障严重程度.最后,可以通过对当前多次瞬时故障信号的欧式距离的中心点求取来评估配网的绝缘劣化水平.“,”In respect to the research on the zero-model current signal generated by the instantaneous fault be fore the occurrence of the permanent fault of the power distribution network insulation,2 characteristic quant ities are extracted to characterize the severity of the instantaneous default.At first,decompose the signal into high and low frequency components dealt by the HHT technology and regard the high and low frequency ene rgy within 7 wave period windows as the first default characteristic quantity;extract a multi-scale sample entr opy of the transient signal within a wave period window by deciding the location of the transient signal and r egard it as the second fault characteristic quantity.Secondly,implement the historical statistical analysis on th ese 2 characteristic quantities to designate low degree,medium degree and severe fault areas of the distributio n map of two-dimension characteristics to identify the severity of the instantaneous fault.Finally,the insulati on deterioration level the power distribution network could be assessed by getting the central point of the Euc lidean distance of current instantaneous fault signals.