潮气侵入对油浸纸套管电气特性的影响

发布时间：2018-04-09 21:34

本文选题：潮气侵入　切入点：油浸纸套管　出处：《高电压技术》2017年08期

【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20 mg/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Δtanδ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。
[Abstract]:In order to study the influence of moisture invasion on the electrical characteristics of oil-impregnated paper (OIP) casing, a test model of oil-impregnated paper casing was developed, and the water mist produced by ultrasonic humidifier was used to simulate the damp environment of the casing.The effects of different static time of casing model on water concentration, initial characteristics of partial discharge, dielectric loss angle tangent and capacitance were studied.The results show that the moisture concentration in the oil increases first and then decreases with the change of the rest time, according to the warning value of 20 mg/L of moisture concentration in the oil,The changes of electrical characteristics after moisture intrusion into casing can be divided into three stages: low moisture stage, high moisture stage, moisture migration stage, and the tangent value of dielectric loss angle increases with the increase of test voltage.It is possible to misjudge the detection of damp casing in low moisture stage in current test rules, and the increment of tangent value of dielectric loss angle at high voltage is more sensitive to the detection of dampened defective casing.The maximum increment of dielectric loss angle tangent 螖 tan 未 is 0.2% when the step voltage is raised to 2Um/1.732(Um as the maximum operating voltage of the equipment.Therefore, the performance of the main insulation of the casing can be judged according to the increasing trend of the tangent value of high voltage dielectric loss angle and partial discharge, so as to detect the damped casing as early as possible.
【作者单位】：华北电力大学新能源电力系统国家重点实验室;华北电力大学高电压与电磁兼容北京市重点实验室;中国南方电网科学研究院有限责任公司;
【基金】：国家自然科学基金(51477052) 国家高技术研究发展计划(863计划)(2015AA050204) 中国南方电网有限责任公司科技项目(K-KY2014-002)~~
【分类号】：TM216.5

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