Research Advances in the Kinetic Behavior and Induced Discharge Characteristics of Micron Metal Dust Within GIS/GIL
梁瑞雪1, 刘衡2, 胡琦2, 王健2, 李庆民1*,*
1.新能源电力系统国家重点实验室(华北电力大学),北京市 昌平区 102206
2. 北京市高电压与电磁兼容重点实验室(华北电力大学),北京市 昌平区 102206
LIANG Ruixue1, LIU Heng2, HU Qi2, WANG Jian2, LI Qingmin1,*
1. State Key Lab of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Changping District, Beijing 102206, China
2. Beijing Key Lab of HV and EMC(North China Electric Power University), Changping District, Beijing 102206, China
基金项目:
国家自然科学基金项目(51737005);
国家自然科学基金(青年科学基金项目)(51807060);
Project Supported by National Natural Science Foundation of China (51737005);
National Natural Science Foundation of China (Young Scientistic Program) (51807060);
GIS/GIL will inevitably generate micron metal dust in the production and operation process, which is considered to be the main cause of serious failures such as flashover along the insulator, but there are few direct researches at present. In this paper, the related research progress at home and abroad was scientifically reviewed, and the kinetic behavior and induced discharge characteristics of metal dust were systematically summarized. Firstly, the movement mode of dust in the cavity mainly includes accumulative adsorption and diffusive adsorption. The electric field distortion force is the driving factor of adsorption, but the surface charge of insulator and repulsion force between dust particles further respectively determine the accumulation and diffusion behavior. Due to the small size of dust, the micron effects such as van der Waals force are more prominent. So, the force analysis model of dust under multi-physical field is still one of the key problems to be solved. Secondly, there are three kinds of discharge behaviors induced by dust in the electric field, namely surface flashover, air gap breakdown and diffusive explosion. However, the conditions of the induced discharge and the development process of the discharge were unclear, and there were no relevant observation and characterization means. It is worth noting that the interactive adsorption of dust and insulating fiber in electric field can reduce the air gap breakdown strength by 20%~40%. What’s more, due to the small volume and weak discharge of dust, it is still a key problem to develop detection methods and technologies for mesoscale effect of dust. At the end of this paper, the related experimental measures of suppressing metal dust were summarized. Among them, nano coating has a good effect on restraining accumulative adsorption, while if the accumulative and diffusive dust is to be inhibited at the same time, a new induction and capture technology of dust should be developed.
KEY WORDS :micron level metal dust;adsorption characteristics;flashover;explosion;dust suppression;
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