Nan Y.,Beijing Peoples Electrical Plant Co. |
Wang X.-N.,Beijing Peoples Electrical Plant Co. |
Fan S.-G.,Baoji Power Supply Company |
Zhao Z.-Q.,Beijing Peoples Electrical Plant Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2014
Through the mechanism analysis of protective relay misoperation because of one point earthing in power DC system, this paper proposes safety assessment measures based on system capacitance analysis. Combined with conditions of protective relay misoperation caused by one point earthing and State Grid eighteen anti accident measures, it proposes safety design measures that control negative voltage to earth in DC insulation monitoring system, mainly includes the single arm detection bridge and temporary fixed bridge, and describes the specific implementation plan and corresponding algorithm. According to these measures, a higher safety DC insulation monitoring system is designed which can prevent protective relay misoperation because of one point earthing.
Zhang M.-D.,CAS Institute of Process Engineering |
Zhang M.-D.,University of Chinese Academy of Sciences |
Wang Z.,CAS Institute of Process Engineering |
Zhang X.-W.,China National Electrical Equipment Corporation |
And 3 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2010
The pyrolysis of Gaocheng and Fugu coals in the temperature range from 460 to 520°C, heated by solid heat carrier of quartz sand, was investigated in a continuous pyrolytic apparatus. The yields, composition and characteristics of gas and liquid products were analyzed. The results show that within the temperature range, the yields of gas and liquid increase with increasing pyrolytic temperature, and the maximum liquid yield is about 12%. The gas composition obviously varies with pyrolytic temperature, and the heating value of coal gas is above 25 MJ/m3. The tar is in abundance of phenol derivatives, polycyclic aromatic hydrocarbons, benzene derivatives, and chain hydrocarbons are also found at higher content. The content of benzene derivatives increases with increasing temperature, but the content of phenols decreases with it. Based on the results, a simplified reaction route from phenol derivatives to aromatics has been proposed.
BEIJING PEOPLES Electrical PLANT CO. | Date: 2012-05-15
Circuit breakers; electrical connections, namely, sockets, plugs and contacts; relays, electric; electric fuses; electrical controllers in the nature of push buttons; switches, electric; electricity transformers; electricity inducers.