中文摘要：

为了研究潮气侵入对油浸纸（OIP）套管电气特性的影响，研制了油浸纸套管试验模型，并利用超声波加湿器产生的水雾来模拟套管受潮环境，研究了受潮后套管模型不同静置时间对油中水分质量浓度、局部放电起始特性、介质损耗角正切值、电容量等特征参量的影响。结果表明：受潮后油中水分质量浓度随静置时间的变化而呈现先升高后降低的趋势；根据油中水分质量浓度20mg／L的警示值，可将潮气侵入套管后电气特性变化划分为。3个阶段即低水分阶段、高水分阶段、水分向纸迁移阶段，且3个阶段中，介质损耗角正切值均随试验电压的升高而呈现增长的趋势；现行试验规程中对低水分阶段受潮套管的检测存在误判的可能；高电压下介质损耗角正切值增量对检测受潮缺陷套管较灵敏，可将阶梯升压至2Um／1.732（Um为设备最高运行电压）时介质损耗角正切值最大增量Atang为0．2％作为判断指标。因此，可根据高电压介质损耗角正切值增长趋势以及局部放电情况来判断套管主绝缘的性能状况，以便及早发现受潮套管。

英文摘要：

In order to study the electrical characteristics of ingress of moisture on oil-immigrated paper （OIP） bushing, OIP bushing models were made and the moisture conditions were simulated by ultrasonic humidifier. The parameters of moisture in oil, partial discharge, and tang were measured after the bushing model damped at different time. It is indicated that the moisture in oil firstly increases and then decreases by the standing time of damped bushing, which is classified by the moisture in oil 20 mg/L as three stages： ＂low-moisture stage, high-moisture stage and moisture migration to paper stage＂. All of three stages, the curve of tang- U trends to increase. Therefore, the possibility of misjudgment for moisture bushing in the low-moisture stage may be obtained by traditional measurement. For the suspicious moisture bushing, the maximum value of Atang under the voltage of 2 Um/1.732 （Um is the maximum opreation voltage of the equipment） should be lower than 0.2% for the high sensitivity of moisture bushing. Therefore, the insulation condition of OIP bushing can be judged by measuring tile curve of tang-U and partial discharge so as to find out the moisture bushing earily.