Detection and control of space charges in ion flow field and biological reaction problem in UHV and CG insulation power transmission

在不久的将来，为了高密度电力的传输，日本正在进行超高压输电线路的研究。这就产生了对不危害周围环境和人类的传输设施的需求。基于生物技术对其生物效应进行研究也具有重要意义。本课题针对DCUHV设备中备受期待的离子流场空间电荷的检测与控制方法进行了研究。利用人工双层脂质膜，从分子层面研究了电场与生物细胞膜的相互作用。主要研究结果总结如下：在气体绝缘系统中，最大的薄弱点出现在三结处或污染颗粒附近形成的高电场区。详细研究了高场触发击穿机理。在电场控制的基础上，提出了一种通过改变电极和间隔片的形状来改善间隔片绝缘性能的方法。采用偏压证明诊断方法，研究了高密度SF_6气体中的离子流场特性和间隔层表面的空间电荷分布。研究发现，在高密度或高压条件下，间隔片表面的电荷积累会增强。用低温气体氦测量了高密度气体中电晕放电产生的载流子的迁移率。评述了电子局域化现象及其对电晕模式的影响。研究了氧化胆固醇制备的双层脂膜在脉冲电场作用下的可逆击穿现象。并对击穿机理进行了研究。

Researches on DCUHV transmission line are carried on in Japan for highly dense electrical power transmission in near future. This arises needs for transmission facilities which do no harm to the surrounding environment and human beings. It is also important to make some investigations on the biological effect based on the biotechnology.In this research project, detection and control method of space charge in ion flow field, which is highly expected around DCUHV equipments, was investigated. Furthermore, interactions between electric fields and biological cell membrane were studied by using artificial bilayer lipid membrane on the molecular basis. Main results are summarized as follows.1. Improvement of spacer insulation performance in CG device In gas insulation system, the most weak point appears in a high electric field region which is formed at a triple junction or near a contamination particle. The high field-triggered breakdown mechanism is studied in detail. An improvement method of spacer insulation performance is proposed base on electric field control methods by changing shapes of the electrode and the spacer.2. Ion flow field characteristics in gas insulation system Characteristics of ion flow field in high density SF_6 gas and space charge distribution on spacer surface are investigated by using a bias prove diagnosis method. It is found that charge accumulation on the spacer surface is enhanced under high density or pressure condition.3. Conduction mechanism in high density gas Mobilities of charge carriers generated by corona discharge are measured with cryogenic gaseous helium. Electron localization phenomena and the effect on corona mode are remarked.4. Breakdown mechanism of bilayer lipid membrane in pulsed electric field Reversible breakdown phenomena of bilayer lipid membrane made from oxidized cholesterol are studied. The breakdown mechanism is also investigated.