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

为了在不久的将来实现高密度电力传输，日本正在进行直流超高压输电线路的研究。这就需要对周围环境和人类无害的传输设施。本研究课题主要研究离子流场中空间电荷的检测与控制方法，这也是DCUHV装置的研究热点。在此基础上，利用人工双层类脂膜从分子水平研究了电场与生物细胞膜的相互作用。主要研究结果如下：1.在气体绝缘系统中，最薄弱的环节出现在高电场区域，该区域形成于三重结处或污染颗粒附近。详细研究了高场触发击穿机理。提出了一种基于电场控制方法的通过改变电极和间隔棒的形状来改善间隔棒绝缘性能的方法.气体绝缘系统离子流场特性研究采用偏置诊断法，研究了高密度SF_6气体中离子流场特性和绝缘子表面空间电荷分布。研究发现，在高密度或高气压条件下，间隙壁表面的电荷积累增强.高密度气体中的导电机制用低温氦气测量了电晕放电产生的载流子的迁移率。讨论了电子局域化现象及其对电晕模的影响.脉冲电场作用下双层类脂膜的击穿机理研究了氧化胆固醇双层类脂膜的可逆击穿现象。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.