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10kv變電所電氣部分設(shè)計(jì)畢業(yè)論文(參考版)

2025-07-01 06:58本頁面
  

【正文】 s munications network②scalability and open higher, to the design and application.③stations secondary equipment necessary cables significantly reduced, saving the investment will simplify the maintenance of debugging.Substation automation application refers to automatic control technology, information processing and transmission technology, puter hardware and software systems or automatic devices to replace manual operation of the various operations and improve substation operations, A level of management automation system. Substation automation areas include integrated automation technology。 to the level of an intelligent unit should not lead to damage to the station39。dangerous39。distribution39。distribution39。 China launched integrated substation automation research and development pared with developed countries of the world later, But with the number of protective equipment in a mature and widely used, scheduling automation systems mature application, Substation automation system has been the power system user acceptance of the use, However, the use of the electricity sector in the process, there are roughly two principles : First, the low voltage substation automation system in order to better implement the Unattended achieve reduced efficiency purposes。[7] [8] [9] (北京).1994[10] .附錄1:外文資料翻譯 integrated automation systemIn recent years, as the level of power grid operations increased levels dispatch center to ask for more information, to grasp power grid and the operation of the substation and improve substation controllability, then ask for more focused use of remote control, operation, antiaccident measures, namely Unattended mode of management. to improve labor productivity, reduce the possibility of human error in their operation and improve the reliability. The other hand, the contemporary puter technology, munication technology and other advanced technological means of application, has changed the traditional model of secondary equipment to simplify the system, information sharing, reducing cable, reducing size, lowering the cost has changed the face of the substation operation. For the above reasons, substation automation from hot topic has been shifted to the practical stage, Power industry departments put substation automation as a means of the new technological innovations in power system operation, professional major manufacturers have put substation automation system development as a key development projects, continue to refine and improve their own corresponding to the introduction of integrated substation automation system power system to meet the requirements. Abroad from the early 1980s, began to carry out research and development so far, major power equipment panies are gradually introduced to the mass production products. If ABB, SIEMENS, HARRIS panies, since the 1990s, new substation countries in the world use most of the digital secondary equipment。在設(shè)計(jì)過程中,我付出了很大努力,也取得了不少收獲:我學(xué)習(xí)和掌握了很多技能和知識(shí),鞏固和應(yīng)用了以前學(xué)過的知識(shí),鍛煉了自己多方面的能力,克服了自身原有的缺點(diǎn),培養(yǎng)了努力工作的良好品質(zhì)……盡管我為此做出了極大的努力,但是限于自己的知識(shí)和能力,我的設(shè)計(jì)中肯定還有很多的漏洞和不足,請(qǐng)各位老師和專家批評(píng)指正。三相短路時(shí)短路電流最大所以設(shè)備校驗(yàn)時(shí)參考三相短路電流。電氣主接線確定,在考慮主接線方案的時(shí)候,要做到安全、可靠、靈活、經(jīng)濟(jì)的對(duì)比,同時(shí)了解終端配電所的一般接線方式,根據(jù)國家規(guī)定和相關(guān)的技術(shù)經(jīng)濟(jì)對(duì)比,選出最優(yōu)的主接線方案。 5總結(jié)本次設(shè)計(jì)時(shí)圍繞10kV變電所電氣部分設(shè)計(jì)來的,設(shè)計(jì)圍繞著了解10kV變電所的建設(shè)規(guī)模,各級(jí)額定電壓,各級(jí)電壓聯(lián)絡(luò)線回路數(shù),從原始資料開始分析,進(jìn)行負(fù)荷計(jì)算和無功補(bǔ)償計(jì)算。注:電纜選擇方法同母線選擇,不再贅述。6)T7變壓器:LMY2(10010)型鋁母排Amin=1000mm2I∞(3)103timaC=因Amin≥I∞(3)103timaC 所以滿足要求。 4)T5變壓器:LMY2(8010)型鋁母排Amin=800mm2I∞(3)103timaC=因Amin≥I∞(3)103timaC 所以滿足要求。 2)T2變壓器:LMY2(8010)型鋁母排Amin=800mm2I∞(3)103timaC=因Amin≥I∞(3)103timaC 所以滿足要求。 校驗(yàn):載流量=1245A 由負(fù)荷計(jì)算中得一次側(cè)計(jì)算電流I30(1)表411變壓器一次側(cè)計(jì)算電流I30(1)T1T2TT4T5T6T7T8I301(A)由上表的I30(1)均小于Ial,所以滿足要求。(注:值由《工廠供電》附錄表得,=4s;C值由《工廠供電》附錄表11得,C =87)選擇LMY608 型鋁排母線。 —最小允許截面。(4)母線選擇:①高壓側(cè)母線的選擇:以熱穩(wěn)定條件選擇母線截面 Amin=I∞(3)103timaC=式中, C—導(dǎo)體的熱穩(wěn)定校驗(yàn)系數(shù),可查表得。因此,一般用熱穩(wěn)定條件確定母線截面,在以其他條件進(jìn)行校驗(yàn)。在本次設(shè)計(jì) 10kV側(cè)采用屋內(nèi)配電裝置,因此采用硬鋁排母線。戶外——軟母線優(yōu)先采用鋼芯鋁絞線。 母線的選擇應(yīng)符合如下條件: 1)母線應(yīng)滿足正常負(fù)荷下的長期運(yùn)行條件;2)應(yīng)能承受故障時(shí)故障電流,尤其是短路電流的短時(shí)作用;3)為保證電源質(zhì)量,必須限制線路上的電壓損失,以滿足線路末端的電壓偏差要求,即應(yīng)滿足線路電壓損失的要求;4)應(yīng)滿足機(jī)械強(qiáng)度要求;5)應(yīng)考慮線路的經(jīng)濟(jì)運(yùn)行。表47 低壓隔離開關(guān)技術(shù)參數(shù)QP630QP1000QP2500額定絕緣電壓(V~)100010002500額工作電流(A)63010002500額定電壓(V~)380額定分?jǐn)嚯娏鳎ˋ)94515003750額定接通電流(A)94515003750額定短時(shí)耐受電流325080適配的變壓器編號(hào)TTT6TT8TTT7 (4)互感器的選擇:電流互感器的選擇:10kV 電流互感器按使用用途可分為兩種,一為繼電保護(hù)用,二為測(cè)量用;它們分別設(shè)在配電所的進(jìn)線、計(jì)量、出線、聯(lián)絡(luò)等柜內(nèi)選用互感器 LMG— 系列低壓電流互感器:T1: = 1140 A 選擇 1500A/5A的電流互感器; T2: = A 選擇 1000A/5A的電流互感器; T3: = A 選擇4000A/5A的電流互感器; T4: = 選擇4000A/5A的電流互感器; T5: = 630A 選擇 1000A/5A 的電流互感器; T6: = A 選擇 1000A/5A的電流互感器; T7: = 選擇3000A/5A的電流互感器; T8: = A 選擇1500A/5A的電流互感器式中 ——互感器一次額定電流 ;=(~) ——互感器裝設(shè)處的計(jì)算電流 一次側(cè)額定電流二次側(cè)額定電流為5A電壓互感器的選擇:選擇JDG6— 系列電壓互感器,JDG6— 系列電壓互感器為單相雙線圈干式戶內(nèi)型產(chǎn)品,適合于交流 50HZ,380V電路中,供測(cè)量電壓、電能和功率以及繼電保護(hù)和自動(dòng)裝置用。主要用于有大短電流的配電線路和電動(dòng)機(jī)電路中,作為手動(dòng)不頻繁操作的電源開關(guān)、應(yīng)急開關(guān)和隔離開關(guān),并作電路保護(hù)之用。一般殼架額定電流I宜比實(shí)際線路額定電流選大一級(jí)。其觸頭極數(shù)有單極、2 極、3極和 4 極。低壓斷路器通常是按其結(jié)構(gòu)型式分類的,可分為框架式、塑殼式和小型模塊式。(2)低壓斷路器選擇: 低壓斷路器,又叫低壓自動(dòng)空氣開關(guān)、自動(dòng)開關(guān),是低壓系統(tǒng)中既能分合負(fù)荷電流也是分?jǐn)喽搪冯娏鞯拈_關(guān)電器。 選擇變電所高壓側(cè)的設(shè)備和導(dǎo)體時(shí),其計(jì)算電流應(yīng)取主變壓器高壓側(cè)額電流。其特點(diǎn):結(jié)構(gòu)緊湊,體積小,重量輕,放電性能好,使用壽命長。儲(chǔ)能電動(dòng)機(jī)所需要的電源,選擇直流,有 BAGN1A 型鎘鎳電池直流操作成套柜作為直流操作屏,其有蓄電池屏、控制屏組成。 技術(shù)參數(shù):額定電壓Ur=10kV,最高電壓Umax=,額定電流: ,額定斷流容量Sbr=1000MVA校驗(yàn): 因?yàn)橄到y(tǒng)短路容量S為 ,熔斷器的額定斷流容量為 1000MVA,大于S,所以滿足條件。所以,T1變壓器一次側(cè)選擇上述型號(hào)電流互感器能滿足要求。因?yàn)?40 kA>=,所以滿足動(dòng)穩(wěn)定性條件。所以,T1變壓器一次側(cè)選擇上述接地開關(guān)型號(hào)能滿足要求。 因?yàn)?50 kA>=,所以滿足動(dòng)穩(wěn)定性條件。 所以,T1變壓器一次側(cè)選擇上述高壓隔離開型號(hào)能滿足要求。(2)GN1910 型戶內(nèi)高壓隔離開關(guān) 技術(shù)參數(shù):額定電壓Ur=10kV,最高工作電壓Umax=12kV,額定電流Ir=630A動(dòng)穩(wěn)定電流(峰值)imax=50kA,4s 熱穩(wěn)定電(有效值)It=20kA , 校驗(yàn):①滿足短路故障時(shí)的動(dòng)穩(wěn)定條件,只須滿足,就可滿足動(dòng)穩(wěn)定性。 因=20kA>=,所以滿足分?jǐn)嗄芰l件。②滿足短路故障時(shí)的熱穩(wěn)定條件:只須滿足(式中tim為假想時(shí)間,經(jīng)過計(jì)算tim=)因?yàn)?6164=1024>=,所以滿足熱穩(wěn)定性條件。已知數(shù)據(jù):= kV ,= kA , == kA,= ,= kVA以T1變壓器一次側(cè)為例對(duì)設(shè)備進(jìn)行選擇和校驗(yàn):(1)VD4 型真空斷路器技術(shù)參數(shù):額定電壓Ur=10kV額定電流Ir=630A,4s額定熱穩(wěn)定電流(有效值)It=16kA ,額定動(dòng)穩(wěn)定電流(峰值)imax=40kA,額定短路開斷電流Ibr=40kA校驗(yàn):①滿足短路故障時(shí)的動(dòng)穩(wěn)定
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