不同工频电压下110kV级XLPE电缆绝缘中电树枝生长情况与局放特征

摘要

In the aging process of the 110kv XLPE cable, it is found that the growth characteristics of the electrical tree are different at different voltages. By analyzing the growth characteristics and partial discharge at each stage, it is found that the maximum quantity of a partial discharge and frequency of partial discharges within one power frequency cycle are related to the characteristics of the tree growth. Results have proved that certain features of the partial discharge can better reflect severity of the electrical tree.%通过实时观测110 kV电缆切片中电树枝老化过程,发现在不同电压等级下电树枝生长特性各异.将其生长特性与各阶段采集到的局部放电数据进行统计分析,发现一个工频周期内的最大放电量和放电次数与树枝生长有一定关系,9 kV时电树枝生长过程中有一段时间有局部放电熄灭现象,整个过程的最大放电量在电树枝生长的前期阶段；12 kV时电树枝生长过程中局部放电特征量存在一个衰减期,但最大的放电量在生长末期；18 kV时局放特征量都有平稳缓慢增长趋势.结果表明,通过局部放电某些特征量能较好地反映电树生长严重程度.