【正文】 畢 業(yè) 設 計 (論文 ) 題 目： 110kV 降壓變電站電氣一次系統(tǒng)設計 系 別 專業(yè)班級 學生姓名 指導教師 2021 年 6 月 華北電力大學科技學院本科畢業(yè)設計（論文） I 110kV 降壓變電站電氣一次系統(tǒng)設計 摘要 隨著電力技術高新化、復雜化的迅速發(fā)展，電力系統(tǒng)在從發(fā)電到供電的所有領域中，通過新技術的使用，都在不斷的發(fā)生變化。變電所作為電力系統(tǒng)中一個關鍵的環(huán)節(jié)也同樣在新技術領域得到了充分的發(fā)展。 變電站是電力系統(tǒng)的一個重要組成部分，由電器設備及配電網(wǎng)絡按一定的接線方式所構成，他從電力系統(tǒng)取得 電能，通過其變換、分配、輸送與保護等功能，然后將電能安全、可靠、經濟的輸送到每一個用電設備的轉設場所。作為電能傳輸與控制的樞紐，變電站必須改變傳統(tǒng)的設計和控制模式，才能適應現(xiàn)代電力系統(tǒng)、現(xiàn)代化工業(yè)生產和社會生活的發(fā)展趨勢。隨著計算機技術、現(xiàn)代通訊和網(wǎng)絡技術的發(fā)展，為目前變電站的監(jiān)視、控制、保護和計量裝置及系統(tǒng)分隔的狀態(tài)提供了優(yōu)化組合和系統(tǒng)集成的技術基礎。 110kV 變電站屬于高壓網(wǎng)絡，該地區(qū)變電所所涉及方面多，考慮問題多，分析變電所擔負的任務及用戶負荷等情況，選擇所址，利用用戶數(shù)據(jù)進行負荷計算，確定用戶無功 功率補償裝置。同時進行各種變壓器的選擇，從而確定變電站的接線方式，再進行短路電流計算，選擇送配電網(wǎng)絡及導線，進行短路電流計算。選擇變電站高低壓電氣設備，為變電站平面及剖面圖提供依據(jù)。本變電所的初步設計包括了：（ 1）總體方案的確定（ 2）短路電流的計算（ 3）高低壓配電系統(tǒng)設計與系統(tǒng)接線方案選擇（ 4）防雷保護等內容。 關鍵詞 ： 變電站；輸電系統(tǒng)；配電系統(tǒng)；高壓網(wǎng) 華北電力大學科技學院本科畢業(yè)設計（論文） II A DESIGN OF ELETRIC SYSTEM FOR 110kV STEPDOWN TRANSFORMER SUBSTATION ABSTRACT Along with the high and quick development of electric power technique, electric power system then can change from the generate of the electricity to the supply the power. 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 110voltage 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華北電力大學科技學院本科畢業(yè)設計（論文） 1 目 錄 摘要 ........................................................................ I ABSTRACT ................................................................... II 原始數(shù)據(jù) .................................................................... 4 1電氣主接線選擇 ............................................................ 5 概述 ....................................................................................................................................... 5 可靠性 ............................................................. 5 靈活性 ............................................................. 5 經濟性 ............................................................. 5 主接線的接線方式選擇 ....................................................................................................... 6 單母線接線 ......................................................... 6 單母分段 ........................................................... 6 單母分段帶旁路母線 ................................................. 6 橋形接 線 ........................................................... 6 一個半斷路器（ 3/2）接線 ............................................ 7 雙母接線 ........................................................... 7 雙母線分段接線 ..................................................... 7 2主變壓器容量、臺數(shù)及形式的選擇 ............................................ 8 概述 ..................................................................................................................................... 8 主變壓器臺數(shù)的選擇 ........................................................................................................... 8 主變壓器容量的選擇 ........................................................................................................... 8 主變壓器型式的選擇 ........................................................................................................... 9 主變壓器相數(shù)的選擇 ................................................. 9 繞組數(shù)的選擇 ....................................................... 9 主變調壓方式的選擇 ................................................ 10 連接組別的選擇 .................................................... 10 容量比的選擇 ...................................................... 10 主變壓器冷卻方式的選擇 ............................................ 10 3短路電流計算 ............................................................. 11 概述 ..................................................................................................................................... 11 短路計算的目的及假設 ..................................................................................................... 11 短路電流計算的目的 ................................................ 11 短路電流計算的一般規(guī)定 ............................................ 11 短路計算基本假設 .................................................. 12 華北電力大學科技學院本科畢業(yè)設計（論文） 2 基準值 ............................................................ 12 短路電流計算的步驟 ................................................ 12 4電氣設備的選擇 ........................................................... 13 概述 ............................................................................