【正文】
華北電力大學(xué)科技學(xué)院本科畢業(yè)設(shè)計(jì)(論文) I 220kV 變電站電氣一次系統(tǒng)設(shè)計(jì) 摘要 變電站是電力系統(tǒng)的一個(gè)重要組成部分,由電器設(shè)備及配電網(wǎng)絡(luò)按一定的接線方式所構(gòu)成,他從電力系統(tǒng)取得電能,通過(guò)其變換、分配、輸送與保護(hù)等功能,然后將電能安全、可靠、經(jīng)濟(jì)的輸送到每一個(gè)用電設(shè)備的 專 設(shè)場(chǎng)所。作為電能傳輸與控制的樞紐,變電站必須改變傳統(tǒng)的設(shè)計(jì)和控制模式,才能適應(yīng)現(xiàn)代電力系統(tǒng)、現(xiàn)代化工業(yè)生產(chǎn)和社會(huì)生活的發(fā)展趨勢(shì)。隨著計(jì)算機(jī)技術(shù)、現(xiàn)代通訊和網(wǎng)絡(luò)技術(shù)的發(fā)展,為目前變電站的監(jiān)視、控制、保護(hù)和計(jì)量裝置及系統(tǒng)分隔的狀態(tài)提供了優(yōu)化組合和系統(tǒng)集成的技術(shù)基礎(chǔ)。 220kV 變電站 屬于高壓網(wǎng)絡(luò),該地區(qū)變電所所涉及方面多,考慮問(wèn)題多,分析變電所擔(dān)負(fù)的任務(wù)及用戶負(fù)荷等情況,選擇所址,利用用戶數(shù)據(jù)進(jìn)行負(fù)荷計(jì)算,確定用戶無(wú)功功率補(bǔ)償裝置。同時(shí)進(jìn)行各種變壓器的選擇,從而確定變電站的接線方式,再進(jìn)行短路電流計(jì)算,選擇送配電網(wǎng)絡(luò)及導(dǎo)線,進(jìn)行短路電流計(jì)算。選擇變電站高低壓電氣設(shè)備,為變電站平面及剖面圖提供依據(jù)。本變電所的初步設(shè)計(jì)包括了: (1)總體方案的確定 ; (2)短路電流的計(jì)算 ; (3)高低壓配電系統(tǒng)設(shè)計(jì)與系統(tǒng)接線方案選擇 ; (4)防雷保護(hù)等內(nèi)容。 關(guān)鍵詞: 變電站;輸電系統(tǒng);配電系統(tǒng);高壓網(wǎng) 華北電力大學(xué)科技學(xué)院本科畢業(yè)設(shè)計(jì)(論文) 1 A DESIGN OF ELETRIC SYSTEM FOR 220KV STEPDOWN TRANSFORMER SUBSTATION ABSTRACT The substation is an importance part of the electric power system, it is consisted of the electric appliances equipments and the Transmission and the Distribution. It obtains the electric power from the electric power system, through its function of transformation and assign, transport and safety. Then transport the power to every place with safe, dependable, and economical. As an important part of power’s transport and control, the transformer substation must change the mode of the traditional design and control, then can adapt to the modern electric power system, the development of modern industry and the of trend of the society life. The region of 220voltage effect many fields and should consider many problems. Analyse change to give or get an electric shock a mission for carrying and customers carries etc. circumstance, choose the address, make good use of customer data proceed then carry calculation, ascertain the correct equipment of the customer. At the same time following the choice of every kind of transformer, then make sure the line method of the transformer substation, then calculate the shortcircuit electric current, choosing to send together with the electric wire method and the style of the wire, then proceeding the calculation of shortcircuit electric current. This first step of design included:(1) ascertain the total project (2) the calculation of the shortcircuit electric current . (3) the design of an electric shock the system design to connect with system and the choice of line project .(4) the contents to defend the thunder and so on. Key words: substation。 transmission system。 distribution。 high voltage work. 華北電力大學(xué)科技學(xué)院本科畢業(yè)設(shè)計(jì)(論文) 2 前言 目前,我國(guó)城市電力網(wǎng)和農(nóng)村電力網(wǎng)進(jìn)行大規(guī)模的改造,與此相應(yīng),城鄉(xiāng)變電所也正不斷的更新?lián)Q代。我國(guó)電力網(wǎng)的現(xiàn)實(shí)情況是常規(guī)變電所依然存在,小型變電所,微機(jī)監(jiān)測(cè)變電所,綜合自動(dòng)化變電所相繼出現(xiàn),并得到迅速的發(fā)展。然而,所有的變化發(fā)展都是根據(jù)變電設(shè)計(jì)的基本原理而來(lái),因此對(duì)于變電設(shè)計(jì)基本原理的掌握是創(chuàng)新的根本。 本畢業(yè)設(shè)計(jì)的內(nèi)容是 220kV終端變電所電器一次系統(tǒng)設(shè) 計(jì)。正是最為常見(jiàn)的常規(guī)變電所,并根據(jù)變電所設(shè)計(jì)的基本原理設(shè)計(jì),務(wù)求掌握常規(guī)變電所的電氣一次系統(tǒng)的原理及設(shè)計(jì)過(guò)程。通過(guò)對(duì)原始資料的分析、主接線的選擇及比較、短路電流的計(jì)算、主要電氣設(shè)備的選擇及校驗(yàn)、線路圖的繪制及避雷器、避雷針的選擇等步驟、最終確定該變電所的主要電氣設(shè)備、主接線圖以及變電所防雷保護(hù)方案。 華北電力大學(xué)科技學(xué)院本科畢業(yè)設(shè)計(jì)(論文) 3 目 錄 摘要 ........................................................................ 1 ABSTRACT .................................................................... 1 前言 ........................................................................ 2 原始數(shù)據(jù) .................................................................... 1 1電氣主接線選擇 ............................................................ 2 概述 .................................................................... 2 主接線設(shè)計(jì)的基本要求 .................................................... 2 主接線可靠性的要求 .................................................... 2 主接線靈活性的要求 .................................................... 2 主接線經(jīng)濟(jì)性的要求 .................................................... 3 主接線的設(shè)計(jì)原則 ...................................................... 3 主接線的接線方式選擇 .................................................... 3 單母線接線 ............................................................ 3 單母分段 .............................................................. 3 單母分段帶旁路母線 .................................................... 4 橋形接線 .............................................................. 4 一臺(tái)半斷路器( 3/2)接線 ............................................... 4 雙母 接線 .............................................................. 4 雙母分段接線 .......................................................... 4 電氣主接線的設(shè)計(jì)步驟 .................................................... 4 2主變壓器的選擇 ............................................................ 6 概述 .................................................................... 6 主變壓器選擇的一般原則與步驟 ............................................ 6 主變壓器臺(tái)數(shù)的確定 .................................................... 6 主變壓器型號(hào)的選擇 .................................................... 6 主變壓器容量的確定原則 ................................................ 7 主變壓器型式的選擇 ...................................................... 7 繞組數(shù)的選擇 .......................................................... 7 主變調(diào)壓方式的選擇 .................................................... 8 容量比的選擇 .......................................................... 8 3短路電流 計(jì)算 .............................................................. 9 概述 .................................................................... 9 華北電力大學(xué)科技學(xué)院本科畢業(yè)設(shè)計(jì)(論文) 4 短路電流計(jì)算的目的 ...................................................... 9 短路電流計(jì)算的