【正文】 al none grounding to raise power supply reliability. So it is an important subject to make use of new type earth device to apply to the distribution network under considering the situation in such factors of various fields as power supply reliability, safety factor, overvoltage factor, the choice of relay protection, investment cost, etc.The main work of this paper is to research and choice the neutral grounding mode of the l0kV distribution network. The neutral grounding mode of the l0kV network mainly adopts none grounding, grounding by arc suppressing coil, grounding by reactance grounding and directly grounding. The best grounding mode is confirmed through the technology parison. It can help the network run in safety and limit the earth electric arc by using autotracking pensate device and using the line protection with the detection of the sensitive small ground current. The paper introduces and analyzes the characteristic of all kind of grounding modes about l0kV network 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 network. 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 network 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 network 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 net 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。t consider that it39。s selfcontradictory in the coexistence of economy and reliable. To improve the reliability of the power supply network, we must increase the investment cost of the network con struction But, if the cost that improve the reliability of the network 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 net 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 net in foshan..First, the thesis introduces as the different line modes in the l0kV electric distribution net and in some foreign countries. Making it clear tow to conduct analyzing on the line mode of the electric distribution net, 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 calculation and analyses towards the reliability and economy of the different line modes of electric distribution net, describing drafts according by the calculation. Then it makes analysis and discussion on the number of optimization subsection.At last, the article make conclusion on the economy and reliability of different line modes, as well as, its application situation. Accordion to the actual circumstance, the thesis puts forward the beneficial suggestion on the programming and construction of the l0kV electric distribution net in all areas in foshan. Providing the basic theories and beneficial guideline for the programming design of the lOkV electric distribution net and building up a solid net, reasonable layout, qualified safe and efficientlyworked electric distribution net.References [1] Wencheng Su. Factories power supply [M]. Machinery Industry Publishing House. [2] Jiecai Liu. Factories power supply design guidance [M]. Machinery Industry Publishing [3] Power supply and distribution system design specifications[S].China plans Press. 1996[4] Lowvoltage distribution design specifications [S].China plans Press. 摘要：電力系統(tǒng)的基本功能是向用戶輸送電能。10kv配電網(wǎng)是連接供電電源與工業(yè)、商業(yè)及生活用電的樞紐，其網(wǎng)絡龐大及復雜。對于所有用戶都期望以最低的價格買到具有高度可靠性的電能。然而，經(jīng)濟性與可靠性這兩個因素是互相矛盾的。要提高供電網(wǎng)絡的可靠性就必須增加網(wǎng)絡建設投資成本。但是，如果提高可靠性使用戶停電損失的降低小于用于提高可靠性所增加的投資，那么這種建設投資就沒有價值了。通過計算電網(wǎng)的投資和用戶停電的損失，最終可找到一個平衡點，使投資和損失的綜合經(jīng)濟性最優(yōu)。關鍵詞：供配電，供電可靠性，無功補償，負荷分配1 引言電力體制的改革引發(fā)了新一輪大規(guī)模的電力建設熱潮從而極大地推動了電力技術革命新技術新設備的開發(fā)與應用日新月異特別是信息技術與電力技術的結(jié)合在很大程度上提高了電能質(zhì)量和電力供應的可靠性由于技術的發(fā)展又降低了電力建設的成本進而推動了電網(wǎng)設備的更新?lián)Q代本文就是以此為契機以國內(nèi)外配電自動化中一些前沿問題為內(nèi)容以配電自動化建設為背景對當前電力系統(tǒng)的熱點技術進行一些較深入的探討和研究主要完成了如下工作.(1)提出了配電自動化建設的兩個典型模式即―體化模式和分立化模式側(cè)重分析了分立模式下的配電自動化系統(tǒng)體系結(jié)構(gòu)給出了軟硬件配置主站選擇管理模式最佳通訊方式等是本文研究的前提和實現(xiàn)平臺.(2)針對配電自動化中故障測量定位與隔離以及供電恢復這一關鍵問題分析了線路故障中電壓電流等電量的變化導出了相間短路工況下故障定位的數(shù)學描述方程并給出了方程的解以及故障情況下幾個重要參數(shù)s Uamp。 s Iamp。 e Iamp。 選擇表通過對故障的自動診斷與分析得出了優(yōu)化的隔離和恢復供電方案自動實現(xiàn)故障快速隔離與網(wǎng)絡重構(gòu)減少了用戶