【正文】 ability of the power supply work, we must increase the investment cost of the work construction 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. KEYWORDS: power supply and distribution, power distribution reliability ， reactive pensation, load distribution The revolution of electric power system has brought a new big round construction,which is pushing the greater revolution of electric power technique along with the application of new technique and advanced equipment. Especially, the bination of the information technique and electric power technique, to great ex tent, has improved reliability on electric quality and electric supply. The technical development decreases the cost on electric construction and drives innovation of electric work. On the basis of national and internatio nal advanced electric knowledge, the dissertation introduces the research hotspot for present electric power sy etem as following. Firstly, This dissertation introduces the building condition of distribution automation(DA), and brings forward two typical construction modes on DA construction, integrative mode and fission mode .It emphasize the DA structure under the condition of the fission mode and presents the system configuration, the main station scheme, the feeder scheme, the optimized munication scheme etc., which is for DA research reference. Secondly, as for the (DA) trouble measurement, position, isolation and resume, This dissertation analyzes the changes of pressure and current for line problem, gets math equation by educing phase short circuit and problem position under the condition of singlephase and works out equation and several parameter s Uamp。然而，經濟性與可靠性這兩個因素是互相矛盾的。而接地方式的選擇，是與本國國情、自然環(huán)境、設備制造和運行水平等有關的，例如，雷電的活動情況、絕緣結構的設計、對周邊的干擾等因素，都會影響中性點接地方式的選 擇 。全面介紹國內外幾種常用的中性點接地 方式的運行特性，通過技術經濟比較對不同的接地方式進行綜合評價，再結合不同的接地方式的發(fā)展前景得出結論，優(yōu)化了的諧振接地方式表現(xiàn)出很大的發(fā)展?jié)摿Α? 本論文提出的思路、方案和結論不僅對于 lOkV配電網中性點接地方式選擇研究、實際工程應用具有實際的參考作用，對于其他電壓等級中性點接地方式選擇同樣具有借鑒的作用。論文針對配電網各種接線模式的特點，就各種接線模式的經濟性和可靠性進行了分析。 參考文獻 ［ 1］ 蘇文成 .工廠供電 [M].機械工業(yè)出版社 . ［ 2］ 劉介才 .工廠供電設計指導 [M].機械工業(yè)出版社 . ［ 3］ 供配電系統(tǒng)設計規(guī)范 [S].中國計劃出版社 .1996 ［ 4］ 低壓配電設計規(guī)范 [S].中國計劃出版社 . 。再提出最優(yōu)分段 8 數(shù)計算的必要性，闡述最優(yōu)分段數(shù)對經 濟性和可靠性的影響，然后建立最優(yōu)分段數(shù)計算模型，并簡單介紹各種接線模式的供電方案。 lOkV配電網是連接供電電源與工業(yè)、商業(yè)及生活用電的樞紐，其網絡龐大及復雜。從限制故障接地電弧的危害出發(fā)，重點論述如何利用電流諧振原理，有效熄滅故障接地電弧等。一般在電壓等級較高的系統(tǒng)中，絕緣費用在設備總價格中占相當大的比重，降低絕緣水平帶來的經濟效益很顯著，通常就采用中性點直接接地的方式，而采用自動重合閘來保證供電可靠性 :相反，在電壓等級較低的系統(tǒng)中，通常都采用中性點不接地的方式來提高供電可靠性。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。 and e Iamp。 , s Iamp。要提高供電網絡的可靠性就必須增加網絡建設投資成本。反過來，中性點接地方式對電力系統(tǒng)的設計、運行、調試以及發(fā)展都有很大影響。 然后，本文對 lOkV配電網中性點諧振接地方式的運行特性進行了研究和介紹。 電力系統(tǒng)的基本功能是向用戶輸送電能。 3 小結 論文首先介紹 lOkV配電網各種典型的接線模式和國外幾個國家的典型接線模式，然后確定配電網接線模式分析的思路，明確進行分析的必要性和重要性