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電廠110kv降壓變電站電氣部分設(shè)計(jì)-資料下載頁(yè)

2025-07-29 08:58本頁(yè)面
  

【正文】 =[(KA)2*S]內(nèi)部動(dòng)穩(wěn)定校驗(yàn): Kd**IN1=150**=(2) 結(jié)論: LCW—110滿足要求 10KV側(cè)CT選擇校驗(yàn)(1)選擇CT根據(jù)電流互感器安裝處電網(wǎng)電壓,最大工作電流和安裝地點(diǎn)的要求,查表,初選LAJ—10型戶外獨(dú)立的電流互感器,電流互感器變比為(2000/6000)/5,準(zhǔn)確度級(jí)為1級(jí),動(dòng)穩(wěn)定倍數(shù)Kd=90,熱穩(wěn)定倍數(shù)Kr=50(2) 檢驗(yàn)所選CT的熱穩(wěn)定和動(dòng)穩(wěn)定熱穩(wěn)定檢驗(yàn): (Kr*IN1)2*1=(50*6)2*1=90000[(KA)2*S] QK=[(KA)2*S]內(nèi)部動(dòng)穩(wěn)定校驗(yàn): Kd**IN1=90**6=(3)結(jié)論: LAJ—10滿足要求 支柱絕緣子的選擇校驗(yàn)(1)型式:用于屋外式,一般用棒式支柱絕緣子。(2)電壓:絕緣子的額定電壓應(yīng)大于其安裝處的工作電壓,為10KV。(3)動(dòng)穩(wěn)定校驗(yàn): FMAX= , FMAX=*I2sh*L*107/a 式中 L支柱絕緣子的計(jì)算跨距(m) a相間間隔(m) 10KV擬選用ZD—10型支柱絕緣子FMAX=*I2sh*L*107/a= ***107/1==*2000=1200kg 可見(jiàn) FMAX= 滿足要求 10KV穿墻套管的選擇(1)按電壓選擇: 穿墻套管的額定電壓應(yīng)大于其安裝處的工作電壓10KV(2)按額定電流選擇: 穿墻套管額定電流IN大于安裝處的最大持續(xù)工作電流 IN=IMAX= SN/(* UN)=40/(*10)=(3)選型: 根據(jù)工作電流和額定電流,選用CMWF2—20母線套管,套管長(zhǎng)度Ica=625mm,Fg=4000N(4)動(dòng)穩(wěn)定校驗(yàn): 計(jì)算跨度lc=(1+lca) /2=套管受力:F=*I2sh*L*107/a= ***107/1= =*4000=2400kg 可見(jiàn) FMAX= 滿足要求(5)熱穩(wěn)定校驗(yàn): 穿墻套管熱穩(wěn)定校驗(yàn)與斷路器熱穩(wěn)定校驗(yàn)一樣,CMWF2—20母線套管相關(guān)參數(shù)計(jì)算如下: I2t*t= 602*4=14400[(KA)2*S]QK=,滿足要求 母線導(dǎo)體的選擇校驗(yàn)(1)型式: 初步選擇矩形鋁母線:(2)截面積選擇:IMAX= SN/(* UN)=40/(*10)= Iy=擬初步選用63*10(mm2)三條平放矩形導(dǎo)體,集膚效應(yīng)系數(shù)KS=(3)熱穩(wěn)定校驗(yàn): 查閱不同工作溫度下裸導(dǎo)體的熱穩(wěn)定系數(shù)C,因?yàn)榫匦螌?dǎo)體選擇時(shí)在最高允許溫度+700C計(jì)算得:C=87, QK=274[(KA)2*S], Smin= Q1/2K/C= (274*103)1/2/87=190mm2 式中 C母線的熱穩(wěn)定系數(shù) QK短路電流熱效應(yīng) (KA)2*s Smin 滿足熱穩(wěn)定最小截面,mm2故選擇截面:S=63*10=630Smin,滿足條件。(4)動(dòng)穩(wěn)定校驗(yàn): 設(shè)相間距a=,跨距l(xiāng)=,δMAX= *L*107/a= ***107/=δMAX=δy=(500700kg)式中 δy 母線材料的允許應(yīng)力,鋁為500700kg/cm δMAX 母線材料的最大應(yīng)力 δMAX= *L*107/a(5)結(jié)論: 選擇63*10 (mm2)三條平放矩形導(dǎo)體 電抗器的選擇校驗(yàn)(1)回路最大持續(xù)工作電流: 只對(duì)城一線IMAX= SN/(* UN)=(*10*)=481KA 初步選型號(hào)查表,按正常工作電壓和最大工作電流選擇型電抗器, UN=10KV, IN=200A(2)選擇電抗值:IB= 100/(*)= XL% =( IB/ I″ X*)* INL* UB*100%/(UNL*IB) =()*200*10500*100%/*(5500*10000)=% 故選擇XKGK102006型。電抗百分值是6%。(3)電壓損失檢驗(yàn):ΔU%=ΔU*100%/ UNL= XL%* IMAXsinΦ/ INL =*481*5%(4)殘余電壓校驗(yàn):Urem% =XL%I″/INL=*=60%,滿足要求。(5)動(dòng)穩(wěn)定、熱穩(wěn)定校驗(yàn): Ish = QK=274[(KA)2*S] I2t*t= 182*1=324[(KA)2*S],滿足要求。故選擇XKGK102006型水泥電抗器。設(shè)計(jì)總結(jié)在這兩個(gè)多月的時(shí)間里,我查閱了110KV系列變電站的相關(guān)資料,了解了變電站的發(fā)展過(guò)程、設(shè)計(jì)原則及特點(diǎn),主要做了以下工作,一次系統(tǒng)設(shè)計(jì)包括:變電站主變選擇、電氣主接線的選擇、所用電設(shè)計(jì)及功率因數(shù)的補(bǔ)償、短路電流計(jì)算,從而進(jìn)行電氣設(shè)備的選擇和校驗(yàn)。在此過(guò)程中,我從對(duì)變電站的生疏,到了解,再到深入研究,第一次完成了一件實(shí)際應(yīng)用的設(shè)計(jì),感覺(jué)有不少的收獲:,并在以前的基礎(chǔ)上理解的更加透徹,掌握的更加熟練;,將課本上學(xué)到的理論知識(shí)和實(shí)際生產(chǎn)聯(lián)系了起來(lái);。雖然,在這個(gè)過(guò)程中我也曾遇到了不少困難,但是,在老師和同學(xué)們的熱情幫助和我自己的不懈努力下,所有的難題都被我逐個(gè)解決,我也從中獲得了勝利的喜悅。這也讓我明白了一個(gè)道理:前途是光明的,道路是曲折的,只有靠自己頑強(qiáng)拼搏的精神和堅(jiān)持不懈的努力才能夠到達(dá)成功的彼岸。正所謂:天下無(wú)難事,只要肯攀登。只要有契而不舍的精神,就沒(méi)有辦不到的事!最后畫(huà)了電氣主接線圖、全站平面布置圖??傊矣X(jué)得我的畢業(yè)設(shè)計(jì)做的還是比較成功的,因?yàn)槲矣胁恍〉氖斋@。就快要畢業(yè)了,也為我的大學(xué)畫(huà)上一個(gè)完美的句號(hào)。在此,我還要感謝在我做畢業(yè)設(shè)計(jì)的過(guò)程中,給與我?guī)椭睦蠋熀屯瑢W(xué)。致 謝經(jīng)過(guò)兩個(gè)多月的時(shí)間,我順利的完成了這次畢業(yè)設(shè)計(jì)。從總體上來(lái)說(shuō),我對(duì)自己的成果還是比較滿意的,也基本上達(dá)到了老師的要求。這段時(shí)間我翻閱了許多的書(shū)籍,從對(duì)變電站的生疏,到了解,再到深入研究,第一次完成了一件實(shí)際應(yīng)用的設(shè)計(jì)。不過(guò)由于本人經(jīng)歷、閱歷、實(shí)際操作能力有限。難免存在一些不近人意的地方,請(qǐng)各位老師指點(diǎn)。 通過(guò)本次設(shè)計(jì),不僅豐富了我的專業(yè)知識(shí),還讓我深深體會(huì)到了認(rèn)識(shí)事物的過(guò)程。從拿到題目,再查閱資料,對(duì)題目進(jìn)行設(shè)計(jì)、論證、修改到設(shè)計(jì)的完成。體現(xiàn)了理論聯(lián)系實(shí)際的重要性。更重要的是這次設(shè)計(jì)讓我學(xué)會(huì)了讓自己獨(dú)立完成一件事情,為將來(lái)參加工作做好基礎(chǔ)。本設(shè)計(jì)的順利完成,自己付出了許多勞動(dòng),但與老師的細(xì)心指教是分不開(kāi)的。在過(guò)程中體現(xiàn)出老師的淵博專業(yè)知識(shí),更體現(xiàn)出了老師的寬厚待人的品質(zhì)。我在設(shè)計(jì)過(guò)程中不但學(xué)會(huì)了勤奮求實(shí)的工作精神,更懂得了待人的品質(zhì)。這一切將在我以后的工作生涯中起著重要的作用。借此機(jī)會(huì),向幫助過(guò)我的老師,表示衷心的謝意!在此過(guò)程中,我還要特別感謝給予我?guī)椭耐瑢W(xué)、朋友們,是在他們的鼓勵(lì)、支持下我才會(huì)有今天的成績(jī)。參考文獻(xiàn)[1],2000年.[2],1995年.[3]:. [4].[5].[6]江日洪..[8]張忠祿. 城市配電網(wǎng)設(shè)備選擇的有關(guān)問(wèn)題. 電氣時(shí)代1999(9).[9]徐臘元. (1).[10]衛(wèi)斌. 變電所電氣部分畢業(yè)設(shè)計(jì)指導(dǎo).(第2版). 北京:中國(guó)水利水電出版社,1993.[11] 焦留成. :中國(guó)計(jì)劃出版社,1999.[12]丁毓山,雷振山. :中國(guó)水利水電出版社,2000.[13]應(yīng)震華主編.發(fā)電廠變電所電氣接線和布置(上、下冊(cè)).北京:水利電力出版社,1984.[14][M].,2004,56—59.[15][M].上海科學(xué)技術(shù)出版,2002.[16][M].,2004,102—104.[17]王家紅主編.國(guó)家電網(wǎng)公司輸變電工程典型設(shè)計(jì) 220kV變電站分冊(cè).北京:中國(guó)電力出版社,2006.[18]:水利電力出版社,1999.[19](第一版).北京:中國(guó)電力出版社,2002.附錄IFaults on power systemEach year new designs of equipment bring about increased reliability of operation. Nevertheless, equipment failures and interference by outside sources occasionally result in faults on electric power system. On the occurrence of power from the generating stations to the loads may be unsatisfactory over a considerable area, and if the faulted equipment is not promptly disconnected from the remainder of the system, damage may result to other pieces of operating equipment.A fault is the unintentional or intentional connecting together of two or more conductors which ordinarily operate with a difference of potential between them. The connection between the conductions may be by physical metallic contact or it may be through an arc. At the fault, the voltage between the two parts is reduced to zero in the case of metaltometal contacts, or to a very low value in case the connection is through an arc. Currents of abnormally high magnitude flow the network to the point of fault. These shortcircuit currents will usually be much greater than the designed thermal ability of the conductors in the lines or machines feeding the fault. The resultant rise in temperature may cause damage by the annealing of conductors and by the charring of insulation. In the period during which the fault is permitted to exist, the voltage on the system in the near vicinity of the fault will be so low that utilization equipment will be inoperative. It is apparent that the power system designer must anticipate points at which fault may occur, be able to calculate conditions that exist during a fault, and provide equipment properly adjusted to open the switches necessary to disconnect faulted equipment from the remainder of the system. Ordinarily it is desirable that no other switches on the system are opened, as such behavior would result in unnecessary modification of the system circuits.A distinction must be made between a fault and an overload. An overload implies only that loads greater than the designed value have been imposed on system. Under such a circumstance the voltage at the overload point may be low, but not zero. This undervoltage condition may extend for some distance beyond the overload point into the remainder of the system. The currents in the overloaded equipment are high and may exceed the thermal design limits. Nevertheless, such currents are substantially lower than in the case of a fault. Servic
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