【正文】 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 barbed wire net breakdown to make the customer the power is off:①The customer of two back track power supplies , after losing a back track, should be unlimited to give or get an electric shock.②The customer of three back track power supplies , after losing a back track, should be unlimited to give or get an electric shock, again after losing a back track, should satisfy power supply capacity 5070% is used an electricity.③When all of a back track or much customer39。s the power of back track power supplies stopped, resume target time of power supply broke down to handle for a back track restored of ask.④At wreath net power supply method in for open the customer in the wreath network, the lowest instauration power supply request for breaking down wreath net is to need to pass charged barbed wire net operation instaurationPower supply of time, its target time need for operating of ask。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 going together with the power supply safety of charged barbed wire net to usually request is to adopt N one one is one 2 standards to have already adopted quasi N as well at the power supply safety specially important place one 2 standards or Ns.2)Medium press and go together with charged barbed wire net and have certain back up capacity, generally should have 50% Yu degrees, while being any ponent check and fixing and breaking down and stopping and carrying should pass and pour a Zha operation can keep a segment the customer continue toward the customer or non trouble power supply, go together with each ponent of charged barbed wire net while transfering burden however carry, unlimited two set lords hanpen that the power is off at the same time,that is used circuit should adjust above 60% burden.譯文：城市電網(wǎng)運行的最基本要求是安全與穩(wěn)定。城市電網(wǎng)安全穩(wěn)定的核心問題是要建立一個與該城市相適應(yīng)的、合理的電網(wǎng)結(jié)構(gòu)。本文通過對電網(wǎng)規(guī)劃和電力設(shè)計方面的技術(shù)原則分析。闡述了在電網(wǎng)安全中關(guān)于電壓等級、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；以及有針對性的闡述了對220kV變電站和110kV變電站的具體設(shè)計原則相對電網(wǎng)安全供電的要求。如何保證供電可靠性1)滿足電網(wǎng)供電安全準(zhǔn)則。供電網(wǎng)絡(luò)滿足供電可靠性的要求。全部滿足N—l的準(zhǔn)則，城區(qū)中心高負荷密度區(qū)域重要用戶滿足N2的準(zhǔn)則。不允許變壓器過載。濟南城網(wǎng)供電可靠率指標(biāo)規(guī)劃目標(biāo)為99．99％。2)城市中壓配電網(wǎng)負荷轉(zhuǎn)移能力滿足以下要求：①變電站失去任何一回進線或一臺主變壓器而降低供電能力時，中壓配電網(wǎng)具有轉(zhuǎn)移負荷確保供電的能力。②變電站的一段母線因放停運時，中壓配電網(wǎng)應(yīng)具有轉(zhuǎn)移全部負荷的能力。③10kV配電線路任何一段檢修或故障時，配電網(wǎng)應(yīng)具備轉(zhuǎn)移非檢修、非故障段負荷的能力。非檢修、非故障段負荷停電時間僅為配電設(shè)備倒閘操作時間。3)配電網(wǎng)故障造成用戶停電時，允許停電的容量和恢復(fù)供電的目標(biāo)時問滿足以下原則：①兩回路供電的用戶，失去一條回路后，應(yīng)不限電。②三回路供電的用戶，失去一條回路后，應(yīng)不限電，再失去一條回路后，應(yīng)滿足供電容量5070％用電。③一回路或多回路供電的用戶電源全停時，恢復(fù)供電的目標(biāo)時間為一回路故障處理恢復(fù)的時問。④在環(huán)網(wǎng)供電方式中對于開環(huán)網(wǎng)絡(luò)中的用戶，環(huán)網(wǎng)故障時的最低恢復(fù)供電要求是需通過電網(wǎng)操作恢復(fù)供電的時間，其目標(biāo)時間為操作所需的時問；配網(wǎng)自動化線路是通過配網(wǎng)自動化限制在lmin內(nèi)恢復(fù)完好區(qū)段的供電。(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)計導(dǎo)則》規(guī)定的上限要求。根據(jù)2001年國家經(jīng)濟貿(mào)易委員會頒布的電力行業(yè)標(biāo)準(zhǔn)《電力系統(tǒng)安全穩(wěn)定導(dǎo)則》中指出：N．1準(zhǔn)則為正常運行方式下的電力系統(tǒng)中任一元件(如線路、發(fā)電機、變壓器等)無故障或因故障斷開，電力系統(tǒng)應(yīng)能保持穩(wěn)定運行和正常供電，其他元件不過負荷，電壓和頻率均在允許范圍內(nèi)。這通常稱為N．1準(zhǔn)則。電網(wǎng)供電安全準(zhǔn)則有：N—l準(zhǔn)則、準(zhǔn)N一2準(zhǔn)則和N一2準(zhǔn)則。城市配電網(wǎng)的供電安全通常要求是采用N一1準(zhǔn)則。在供電安全特別重要的地方也有采用準(zhǔn)N一2準(zhǔn)則或N一2準(zhǔn)則。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時，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)移負荷時配電網(wǎng)的各元件不過負荷、不限電。變電站兩臺主變同時停電時，公用線路應(yīng)調(diào)出60％以上負荷。