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【期刊论文】The influence of experimental method on the flashover performance of alumina in vacuum
丁立健, Liiian Ding, C.R. Li, Youoing Tu. Jinzhuang Lu, Rui Li
,-0001,():
-1年11月30日
This paper presented some new experimental results observed in our investigation. Based on the experiments, it was found that the different voltage application sequence on the test samples could influence the flashover voltage of the tested samples. Three kinds of voltage application sequences were compared and three kinds of Alumina samples were involved in this paper. In general, the flashover voltage is the lowest if the applied voltage started from a lower voltage (-2kV) at a -2kV step; the flashover voltage could be the highest if the applied voltage started from -22kV. The surface charge distributions were observed after the voltage was applied. According to the experimental results, the change of the flashover voltage of the test samples could be attributed to the state of surface charge distribution with different voltage application sequence.
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丁立健, Lijian Ding, C.R. Li, Wei Wang, Jingchun Wang
,-0001,():
-1年11月30日
This paper has investigated flashover performance of alumina insulators prepared with different additives in vacuum under an impulse voltage. Four kinds of alumina insulator were studied, which were prepared under the same sintering conditions with different additives. The surface flashover performance of these samples has been tested in vacuum. The microstructure of alumina samples has also been observed using the technique of scanning electron microscope (SEM). Based on the experimental results, the characteristics of flashover are different from the test samples. The analysis shows that the influence of additives may be attributed to the change of microstructure.
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【期刊论文】Surface Charge and Surface Preflashover Phenomena of Alumina Insulators in Vacuum
丁立健, Lijian Ding, C.R. Li, Jingchun Wang, Wei Wang, Yangchun Cheng
,-0001,():
-1年11月30日
Investigations have been carried out on Alumina insulators in vacuum under an impulse voltage (0.7/4μS) in order to study the relationship between surface charging and surface preflashover phenomena of insulators in this paper. The Alumina insulators studied were 99.9% alumina cylindrical specimens and the employed electrode system is a non-uniform field electrode system. The surface preflashover phenomena were observed and the surface charge distribution of insulators was measured under varied impulse voltage levels and different shot number at a same fixed voltage level. Based on the experiments, it was found that the charge density and distribution is not only dependent upon the magnitude of the impulse voltage, but also the preflashover phenomena. The number of voltage shot has little influence on the charge density and distribution at the same voltage level if the surface preflashover phenomena can be observed during voltage shot.
Surface charge,, Surface preflashover,, Alumina insulator,, Vacuum
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【期刊论文】Study on the trap distribution characteristic of alumina ceramics
丁立健, Jinzhuang, Lu, Lijian Ding, C.R. Li, Wei Wang, Jingchun Wang
,-0001,():
-1年11月30日
It was considered that the trap distribution of alumina ceramics could affect the flashover performance of insulators. This paper investigated the trap distribution of alumina ceramic samples with different additives and different sintering temperature respectively. Experimental results show that the additives and sintering temperature play an important role on the trap distribution of alumina ceramics respectively, especially on the trap energy distribution, and they affect the trap distribution of alumina ceramics significantly.
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【期刊论文】Study of the Influence of Injected Charge on Streaming Electrification
丁立健, Jiaxiang Yang, Lijian Ding, Xiaochun Chi, Ji Liu and Yuanji He
IEEE Transactions on Dielectrics and Electrical Insulation Vol.5 No.4, August 1998 513~517,-0001,():
-1年11月30日
In this paper, the influence of injected charge on streaming electrification of transformer oil has been investigated using a combined model. The experimental results reveal that there are relations between the injected charge, the charge density and the leakage current, and the polarity effect of injected charge exist in the influence on streaming electrification. The influence of injected charge is attributed to the interaction between the electric double layer and the injected charge. The effect of oil velocity on injected charge has been analyzed also.
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