纳米粒子对植物绝缘油的改性研究
发布时间：2018-08-13 16:03
【摘要】：植物绝缘油是一种新型环保绝缘介质,已在日常生产中得到使用。然而植物绝缘油耐受雷电冲击电压的能力较弱,一定程度上限制了其在高电压等级下的应用。所以有必要进一步提高植物绝缘油的绝缘强度,这不仅可以保证电力变压器的安全运行,还能够减小特高压变压器尺寸,节约投资成本。 本文利用Ti02纳米粒子对植物油进行改性,制备出具有稳定分散性的纳米改性植物绝缘油,测试了改性前后植物油的工频击穿特性、雷电冲击击穿特性和局部放电特性,使用高速相机进一步拍摄观察了纳米粒子对植物绝缘油中流注发展的影响,借助电声脉冲法和热刺激电流法测试分析了改性前后植物绝缘油中电荷输运能力和陷阱特性。 研究结果表明,Ti02纳米粒子能够显著改善植物绝缘油的绝缘性能,其中工频击穿电压提高到1.24倍,雷电击穿电压提高到1.19倍,局部放电起始电压提高到1.05倍。纳米粒子能够较有效的抑制植物绝缘油中快流注的发展,而且纳米改性植物油中的流注发展通道更粗,发展时间更长。纳米改性后的植物绝缘油中电荷消散速率明显提高,局部场强减弱,浅陷阱密度显著提高。 机理的研究结果说明,Ti02纳米粒子的添加,增大了植物绝缘油中浅陷阱的密度,这些浅陷阱反复捕获—释放电荷的过程能够提高电荷输运的能力,减少空间电荷的数量,从而降低流注前端的局部场强,改善本已畸变的电场,抑制流注进一步的发展,从而提高植物油绝缘性能。
[Abstract]:Vegetable insulating oil is a new type of environmental protection insulating medium, which has been used in daily production. However, the ability of vegetable insulating oil to withstand lightning impulse voltage is weak, which limits its application in high voltage level to a certain extent. Therefore, it is necessary to further improve the insulation strength of vegetable insulating oil, which can not only ensure the power transformer. The safe operation can also reduce the size of UHV Transformer and save investment cost.
In this paper, vegetable oil was modified with Ti02 nanoparticles to prepare stable dispersible nano-modified vegetable insulation oil. The breakdown characteristics of power frequency, lightning impulse breakdown and partial discharge characteristics of vegetable oil before and after modification were tested. The development of streaming of vegetable insulation oil by nanoparticles was further observed by high-speed camera. The charge transport capacity and trapping characteristics of modified vegetable insulating oils were analyzed by means of electroacoustic pulse method and thermal stimulation current method.
The results show that Ti02 nanoparticles can significantly improve the insulation performance of vegetable insulating oil, including power frequency breakdown voltage increased to 1.24 times, lightning breakdown voltage increased to 1.19 times, partial discharge initiation voltage increased to 1.05 times. Nanoparticles can effectively inhibit the development of fast flow in vegetable insulating oil, and nano-modified plants. The flow channel in the oil is thicker and the development time is longer. The charge dissipation rate of the nano-modified vegetable insulation oil is obviously increased, the local field strength is weakened, and the shallow trap density is significantly increased.
The results of mechanism study show that the addition of Ti02 nanoparticles increases the density of shallow traps in vegetable insulating oils. The repeated capture-release process of these shallow traps can improve the ability of charge transport, reduce the number of space charges, thereby reducing the local field strength at the front end of the streamer, improving the distorted electric field and suppressing the streaming into the first one. Step by step, thereby enhancing the insulation performance of vegetable oils.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM215.4
本文编号：2181485
[Abstract]:Vegetable insulating oil is a new type of environmental protection insulating medium, which has been used in daily production. However, the ability of vegetable insulating oil to withstand lightning impulse voltage is weak, which limits its application in high voltage level to a certain extent. Therefore, it is necessary to further improve the insulation strength of vegetable insulating oil, which can not only ensure the power transformer. The safe operation can also reduce the size of UHV Transformer and save investment cost.
In this paper, vegetable oil was modified with Ti02 nanoparticles to prepare stable dispersible nano-modified vegetable insulation oil. The breakdown characteristics of power frequency, lightning impulse breakdown and partial discharge characteristics of vegetable oil before and after modification were tested. The development of streaming of vegetable insulation oil by nanoparticles was further observed by high-speed camera. The charge transport capacity and trapping characteristics of modified vegetable insulating oils were analyzed by means of electroacoustic pulse method and thermal stimulation current method.
The results show that Ti02 nanoparticles can significantly improve the insulation performance of vegetable insulating oil, including power frequency breakdown voltage increased to 1.24 times, lightning breakdown voltage increased to 1.19 times, partial discharge initiation voltage increased to 1.05 times. Nanoparticles can effectively inhibit the development of fast flow in vegetable insulating oil, and nano-modified plants. The flow channel in the oil is thicker and the development time is longer. The charge dissipation rate of the nano-modified vegetable insulation oil is obviously increased, the local field strength is weakened, and the shallow trap density is significantly increased.
The results of mechanism study show that the addition of Ti02 nanoparticles increases the density of shallow traps in vegetable insulating oils. The repeated capture-release process of these shallow traps can improve the ability of charge transport, reduce the number of space charges, thereby reducing the local field strength at the front end of the streamer, improving the distorted electric field and suppressing the streaming into the first one. Step by step, thereby enhancing the insulation performance of vegetable oils.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM215.4
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