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畢業(yè)設計---采用半屋內(nèi)gis配電裝置110kv降壓變電所設計(已修改)

2024-08-24 14:42 本頁面
 

【正文】 采用半屋內(nèi) GIS 配電裝置的 TQ 化肥廠 110kV 降壓變電所設計I摘要變電站是電力系統(tǒng)的重要組成部分,它直接影響整個電力系統(tǒng)的安全與經(jīng)濟運行,是聯(lián)系發(fā)電廠和用戶的中間環(huán)節(jié),起著變換和分配電能的作用。電氣主接線是發(fā)電廠變電所的主要環(huán)節(jié),電氣主接線的擬定直接關系著全所電氣設備的選擇、配電裝置的布置、繼電保護和自動裝置的確定,是變電站電氣部分投資大小的決定性因素。本次設計建設一座采用屋內(nèi) GIS 配電裝置的 TQ 化肥廠 110kV 降壓變電所。首先,根據(jù)主接線的經(jīng)濟可靠、運行靈活的要求選擇各個電壓等級的接線方式,在技術方面和經(jīng)濟方面進行比較,選取靈活的最優(yōu)接線方式。其次進行短路電流計算,根據(jù)各短路點計算出各點短路穩(wěn)態(tài)電流和短路沖擊電流,從三相短路計算中得到當短路發(fā)生在各電壓等級的工作母線時,其短路穩(wěn)態(tài)電流和沖擊電流的值。最后,根據(jù)各電壓等級的額定電壓和最大持續(xù)工作電流進行設備選擇,然后進行校驗。同時在設計過程中還要進行主變繼電保護的整定計算和防雷保護的設計,以保證本變電所能可靠安全的運行。關鍵詞:降壓變電所 變壓器 電氣主接線 短路電流 設備選擇 防雷 繼電保護鄭州大學電氣工程學院畢業(yè)設計(論文)IIAbstractSubstation is an important part of the power system, which directly affects the entire power system39。s security and economic operation. It’s the middle part to contact power plants and the user, which plays the role of transformation and distribution of electric energy. Electrical power main connection is the major ponent of plant substation. The development of main power line is directly related to the choice of all the electrical equipment, power distribution equipment layout, relay protection and automatic device identification, which is part of the size of investment of the electrical substation decisive factor.This design is a power distribution with the house39。s TQ GIS 110kV stepdown substation for fertilizer plant. First, according to the economic and reliable operation and flexible requirements of the main power line it will select various voltage levels of wiring, and after technical and economic aspects in the parison, the optimal flexible wiring should be selected.Second, the shortcircuit current calculates. According to the points it calculates short circuit current and steadystate impact of shortcircuit current , and its steadystate current and the impact of shortcircuit current value is obtained from the threephase shortcircuit calculation when shortcircuit occurs in the working bus of every voltage level.Finally, according to the voltage level of the rated voltage and maximum continuous operating current, equipment will be selected, and then checked.At the same time in the design process the main transformer’s relay protection setting calculation and design of lightning protection will be done to ensure the safety of the reliable operation of substation.Keywords: Stepdown substation Transformer Electrical power main connection Shortcircuit current Equipment selection Lightning protection Relay protection采用半屋內(nèi) GIS 配電裝置的 TQ 化肥廠 110kV 降壓變電所設計III前言經(jīng)過三年的系理論知識的學習及各種實習操作,并在老師精心培育下,對電力系統(tǒng)各部分有了初步的認識與了解。在認真閱讀原始材料,分析材料,參考閱讀《電力系統(tǒng)分析》 、 《發(fā)電廠電氣主系統(tǒng)》和《電力系統(tǒng)繼電保護》以及《高電壓技術》等書籍,在指導老師的指導下,經(jīng)過周密的計算和系統(tǒng)的分析,完成了此次畢業(yè)設計。畢業(yè)設計是一個重要環(huán)節(jié),通過設計可以鞏固各課程理論知識,了解變電所設計的基本方法,了解變電所電能分配等各種實際問題,培養(yǎng)獨立分析和解決實際工程技術問題的能力,同時對電力工業(yè)的有關政策、方針、技術規(guī)程有一定的了解,在計算繪圖、編號、設計說明書等方面得到訓練,為今后從事供電技術工作奠定基礎。鄭州大學電氣工程學院畢業(yè)設計(論文)IV目錄摘要 ...................................................................................................................................IAbstract.........................................................................................................................Ⅱ前言 .................................................................................................................................III1 緒論...............................................................................................................................12 負荷分析計算及主變選擇...........................................................................................23 電氣主接線設計...........................................................................................................7 對電氣主接線的基本要求 ........................................................................................7 對電氣主接線方案的初步設計 ................................................................................7 幾種方案的比較及最終接線 ..................................................................................94 短路電流計算.............................................................................................................11 畫等值電路 ..............................................................................................................11 計算短路電流 ..........................................................................................................12 短路電流計算結(jié)果匯總 ........................................................................................145 配電裝置的配置及主要電氣設備的選擇.................................................................15 配電裝置的配置 ....................................................................................................15 選擇導體和電氣設備的一般原則 ........................................................................16 110KV 半屋內(nèi) GIS 配電裝置的選擇 ...................................................................19 6KV 高壓開關柜的選擇 ........................................................................................216 電氣總平面布置設計.................................................................................................317 防雷保護設計.............................................................................................................348 繼電保護整定及配置.................................................................................................38結(jié)論.................................................................................................................................45謝辭.................................................................................................................................46參考文獻.........................................................................................................................47采用半屋內(nèi) GIS 配電裝置的 TQ 化肥廠 110kV 降壓變電所設計 1 1 緒論電力負荷按其重要性可分為三類。一級負荷:中斷供電將造成人身傷亡或重大設備損壞,且難以挽回,帶來極大的政治、經(jīng)濟損失者屬于一級負荷。一級負荷要求有兩個獨立電源供電。二級負荷:中斷供電將造成設備局部破壞或生產(chǎn)流程紊亂,且較長時間才能修復或大量產(chǎn)品報廢,重要產(chǎn)品大量減產(chǎn),屬于二級負荷。二級負荷應由兩回線供電。但當兩回線路有困難時(如邊遠地區(qū)) ,允許有一回專用架空線路供電。三級負荷:不屬于一級和二級的一般電力負荷。三級負荷對供電無特殊要求,允許較長時間停電,可用單回線路供電。在設計主接線時,對于一類負荷必須要兩個獨立的電源供電,并且當任何一個電源失去后,能保證對全部一類
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