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Mechanism of Increase of Dielectric Strength of Gaseous Dielectics by Vapor Mist

蒸气雾提高气态介电材料介电强度的机理

基本信息

批准号：
01460127
负责人：
TAGASHIRA Hiroaki
金额：
$ 4.03万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

Method of insulation by vapor mist dielectrics is to immerse the vapor and mist of a dielectric liquid in an insulating buffer gas to attain excellent dielectric strength, excellent cooling performance and excellent discharge and corona suppression.The results of research in the previous fiscal year include the use of C_6F_<14>, (C_4F_9)_3N, FC77, FC40, FC70 and FC84 as vapor mist dielectrics to prove the improvement of dielectrics strength of the buffer gases of the atmospheric air, SF_6 and c-C_3F_8, demonstrating the effectiveness of vapor mist dielectrics. The research of this year is connected on the mechanism by which the improvement by mist, and not vapor, is attained. Fine powder of dielectric solid SiO_2 is used for mist since of dielectric liquid makes it difficult to separate mist and vapor. The results are as follows ;1) Dielectric strength increases strongly under uniform electric field if SiO_2 fine powder bridges the electrodes.2) Dielectric strength increases unser uniform electric field if SiO_2 fine powder is suspended between the electrodes.3) Even under non-uniform electric field, dielectric strength increases by suspension of SiO_2 fine powder between electrodes.4) The increase in dielectric strength by suspending the fine powder might be explained by the viscous resistance which help suspend the fine powder in the buffer gas.5) By use of SiO_2 fine powder, the effect of mist alone may be simulated.These results together with the the results of the previous year are described in the report of the present research work and published as basic data for gaseous dielectrics insulation.

汽雾绝缘法是将电介质液体的蒸汽和雾浸入绝缘缓冲气体中，以获得优良的绝缘强度、优良的冷却性能和优良的放电和电晕抑制性能<14>。以FC 70和FC 84为气雾剂，对大气、SF_6和c-C_3F_8缓冲气体的雾化强度进行了试验，证明了气雾剂的有效性。今年的研究是关于通过雾而不是蒸汽来实现改善的机制。由于电介质液体的存在使得雾和蒸汽难以分离，因此使用电介质固体SiO_2的细粉末作为雾。结果如下：1）SiO_2细粉桥接电极时，在均匀电场下，介电强度显著增加; 2）SiO_2细粉悬浮在电极之间时，在均匀电场下，介电强度增加; 3）即使在非均匀电场下，电极间悬浮SiO_2微粉可提高介电强度悬浮细粉提高介电强度可能是由于粘性阻力有助于细粉悬浮在缓冲气体中。5）通过使用SiO_2细粉，这些结果与前一年的结果一起，已作为气体绝热的基础数据发表在本研究工作报告中。