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DEVELOPMENT OF POLTRATION-FREE INSULATING OILS AND UTILIZATION TO ENVIRONMENT FRIENDLY POWER APPARATUS

无污染绝缘油的研制及其在环保电力设备中的应用

基本信息

批准号：
18560288
负责人：
HANAOKA Ryoichi
金额：
$ 1.88万
依托单位：
Kanazawa Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560288/
关键词：
Rapeseed ester oil HFC134a gas Electrical insulation characteristics EHD pumping Liquid jet Conical cone to rod electrode Pure conduction pumping mechanism HFC43-10 HFCガス同軸円錐型電極系変性菜種エステル油変性シリコーン油沿面放電特性標準雷インパルス電圧交流絶縁破壊電圧

项目摘要

The properties of electrohydrodynamic (EHD) pumping and dielectric strength were examined for two insulating oils, rapeseed ester oil and silicone oil, which were denatured by a bonding of hydrofluorocarbon (HFC134a) gas components decomposed using a barrier discharge reactor. The results obtained from this study are as follows.1. By taking the difference between spectrums of standard oil and denatured oil using a FT-IR ATR method, it was found that C-F and C-O radicals and C-H and C-O radicals were formed respectively in the denatured rapeseed ester oil and silicone oil.2. The electrical pumping ability in denatured oils was reinforced significantly compared with standard oils by a slight addition of ionic components. In the electrode geometry (quasi-doughnut to plane type) used in the experiment, the current level was less than 1 μA for the applied voltage up to 20 kV. The potential distribution measured at parallel plane electrodes in denatured oils also showed that there existed a … More heterocharge layer near the electrodes, which suggested that the powerful pumping was attributable to the pure conduction pumping mechanism.3. Impulse creeping discharges were affected sensitively by the ionic component in denatured oils. In denatured oils, the streamer propagated longer compared to standard oils, but the lengths of positive streamer did not exceed±15% of those in standard transformer oil. The ac breakdown voltage in denatured oils also reduced compared to those of standard oils. The dielectric strength of denatured rapeseed ester oil, however, was comparable to that of standard transformer oil.On the other hand, the coaxial cone to rod electrode assembly was devised newly and the properties of the liquid jet were experimentally examined. When a positive dc voltage was applied to the rod electrode, the liquid spouted forcibly from the glass tube outlet installed in the top of grounded conical electrode. This EHD pumping comes from the accumulation of ionic charges in the vicinity of rod electrode. It is also shown that a partial insulator coating of rod electrode surface leads to a rising of the pumping pressure and a reduction of the conduction current. An EHD pumping is expected largely as a new cooling technique in the oil-filled power apparatus, but there is need to take into consideration a reciprocal relation between the EHD mechanism and the electrical insulation. Less

研究了两种绝缘油（菜籽油和硅油）的电流体动力学（EHD）抽运和介电强度的特性，这两种绝缘油通过使用阻挡放电反应器分解的氢氟碳（HFC 134 a）气体组分的键合而变性。研究结果如下：1.采用FT-IR ATR方法对标准油和变性油的光谱进行对比，发现变性菜籽油中分别生成了C-F和C-O自由基，硅油中分别生成了C-H和C-O自由基.与标准油相比，通过少量添加离子组分，变性油中的电泵送能力显著增强。在实验中使用的电极几何形状（准甜甜圈到平面型）中，对于高达20 kV的施加电压，电流水平小于1 μA。在平行平面电极上测得的变性油中的电位分布也表明， ...更多信息在电极附近的异质电荷层，这表明强大的泵浦归因于纯传导泵浦机制.变性油中的离子成分对冲击爬电放电有敏感的影响。在变性油中，与标准油相比，流注传播更长，但正流注的长度不超过标准Transformer油中流注长度的±15%。与标准油相比，变性油的交流击穿电压也有所降低。改性菜籽油的介电强度与标准Transformer油相当。另一方面，设计了同轴锥棒电极组件，并对液体射流的特性进行了实验研究。当在棒电极上施加正直流电压时，液体从安装在接地圆锥电极顶部的玻璃管出口强制喷出。这种EHD泵浦来自于杆电极附近离子电荷的积累。研究还表明，棒电极表面的部分绝缘涂层导致泵送压力的升高和传导电流的减小。EHD泵送在很大程度上被期望作为充油动力设备中的新冷却技术，但是需要考虑EHD机制和电绝缘之间的相互关系。少