【正文】
at first. With the parison with technological and economy, the conclusion is drawn that the improved arc suppressing coil grounding mode shows a very big development potential. Then, this paper researches and introduces some operation characteristics of the arc suppressing coil grounding mode of the l0kV distribution work. And then the paper put emphasis on how to extinguish the earth electric arc effectively by utilizing the resonance principle. This paper bines the development of domestic and international technology and innovative achievement, and introduces the puter earth protection and autotracking pensate device. It proves that the improved arc suppressing coil grounding mode have better operation characteristics in power supply reliability, personal security, security of equipment and interference of munication. The application of the arc suppressing coil grounding mode is also researched in this paper. Finally, the paper summarizes this topic research. As a result of the domination of the arc suppressing coil grounding mode, it should be more popularized and applied in the distribution 4 work in the way of thinking, project and conclusions in this thesis have effect on the research to choose the neutral grounding mode not only in I0kV distribution work but also in other power system.. The basic function of the electric power system is to transport the electric power towards customers. The l0kV electric distribution is a key point that connects the power supply with the electricity using on the industry, business and dailylife. For the electric power, all costumers expect to pay the lowest price for the highest reliability, but don39。s selfcontradictory in the coexistence of economy and reliable. To improve the reliability of the power supply work, we must increase the investment cost of the work con struction But, if the cost that improve the reliability of the work construction, but the investment on this kind of construction would be worthless if the reducing loss is on the poweroff is less than the increasing investment on improving the reliability .Thus we find out a balance point to make the most economic, between the investment and the loss by calculating the investment on power and the loss brought from poweroff. The thesis analyses on the economic and the reliable of the various line modes, according to the characteristics various line modes existed in the electric distribution in foshan.. First, the thesis introduces as the different line modes in the l0kV electric distribution and in some foreign countries. Making it clear tow to conduct analyzing on the line mode of the electric distribution , and telling us how important and necessary that analyses are. Second, it turns to the necessity of calculating the number of optimization subsection, elaborating how it influences on the economy and reliability. Then by building up the calculation mode of the number of optimization subsection it introduces different power supply projects on the different line modes in brief. Third, it carries on the c