【正文】 12 。2)中壓配電網(wǎng)具有一定的備用容量，一般應(yīng)有50％裕度，當(dāng)任一元件檢修和故障停運(yùn)時(shí)，應(yīng)通過倒閘操作能保持向用戶或非事故段用戶繼續(xù)供電，轉(zhuǎn)移負(fù)荷時(shí)配電網(wǎng)的各元件不過負(fù)荷、不限電。城市配電網(wǎng)的供電安全通常要求是采用N一1準(zhǔn)則。這通常稱為N．1準(zhǔn)則。(3)供電能力和安全性1)城網(wǎng)中各電壓層網(wǎng)容量之間，按一定的變電容載比配置，各級(jí)電壓網(wǎng)變電容載比滿足現(xiàn)行《城市電力網(wǎng)規(guī)劃設(shè)計(jì)導(dǎo)則》規(guī)定的上限要求。③一回路或多回路供電的用戶電源全停時(shí)，恢復(fù)供電的目標(biāo)時(shí)間為一回路故障處理恢復(fù)的時(shí)問。3)配電網(wǎng)故障造成用戶停電時(shí)，允許停電的容量和恢復(fù)供電的目標(biāo)時(shí)問滿足以下原則：①兩回路供電的用戶，失去一條回路后，應(yīng)不限電。③10kV配電線路任何一段檢修或故障時(shí)，配電網(wǎng)應(yīng)具備轉(zhuǎn)移非檢修、非故障段負(fù)荷的能力。2)城市中壓配電網(wǎng)負(fù)荷轉(zhuǎn)移能力滿足以下要求：①變電站失去任何一回進(jìn)線或一臺(tái)主變壓器而降低供電能力時(shí)，中壓配電網(wǎng)具有轉(zhuǎn)移負(fù)荷確保供電的能力。不允許變壓器過載。供電網(wǎng)絡(luò)滿足供電可靠性的要求。闡述了在電網(wǎng)安全中關(guān)于電壓等級(jí)、供電可靠性、供電能力以及電網(wǎng)安全供電的準(zhǔn)則要求等方面應(yīng)注意的一些問題；以及有針對(duì)性的闡述了對(duì)35kV變電站和10kV變電站的具體設(shè)計(jì)原則相對(duì)電網(wǎng)安全供電的要求。城市電網(wǎng)安全穩(wěn)定的核心問題是要建立一個(gè)與該城市相適應(yīng)的、合理的電網(wǎng)結(jié)構(gòu)。It is the power supply that passes to go together with net automation restriction to resume an intact block in the lmin to go together with net automation circuit.(3)Power supply ability and safety1)Of each electric voltage layer net capacity in the city net, press definitely change the electric capacity carry to pare an allocation, the all levels electric voltage net changes the electric capacity carry pare satisfy the upper limit request that current 《electric power net in the city programming design lead 》 stipulates.According to 2001 national economy trade mittee promulgation of electric power profession standard 《electric power system safety stability lead 》 middle finger: standard is under the normal movement method of the any ponent(is like circuit, generator, and transformer...etc.) in the electric power system have no break down or because of break down break to open, electric power system shouldCan keep stable to circulate with normal power supply, other ponents however carry, electric voltage and frequency all are allowing inside the is usually called N. one standard.The charged barbed wire net power supply safe standard has:Nl standard and quasi N one 2 standards and Ns is one 2 standards.City39。s elaborating request to the concrete design principle opposite charged barbed wire net safe power supply of the 35kV transformer substation and 10kV transformer substation.How to promise power supply credibility1)Satisfy charged barbed wire net power supply safe power supply network satisfies the request of power supply standard that all satisfies Nl, city area center high burden density important customer in the district satisfy the standard of transformer over a southern city net power supply credibility rate index sign programming target is %.2)Press to go together with charged barbed wire net burden to transfer ability in the city satisfy following request:①The transformer substation loses any once enter line or one set lord transformer but lower power supply ability, win press to go together with charged barbed wire net to have to transfer burden to ensure the ability of power supply.②When a female line of transformer substation stops a luck because of putting, winning to press to go together with charged barbed wire net should have the ability that transfer all burden.③When the 10 kv goes together with electric wire road any check to fix or breaks down, going together with the charged barbed wire net should have non check of transfer to fix, non breakdown segment ability for non check fixs,The non breakdown segment carries to the power is off time only for go together with to give or get an electric shock an equipments to pour a Zha operation for time.3)Ask to satisfy a following principle while allowing the capacity of the power outage and the target of the instauration power supply while going together with charged b