某35KV變電所一次系統的設計

電氣工程論文編號:DQ042    論文字數:19037,頁數:39

 目 錄
摘要……………………………………………………………………………. . .…………….....I
Abstract………………………………………………………………………. ..……………....II
1 緒論…………………………………………………………………………………….……....1
 1.1  35KV變電站一次側設計現狀………………………………………......................…....1
 1.2  畢業設計意義及要完成的工作.................…................2
 1.2.1  主要任務與目標…………………………. . …………………………..….…..2
 1.2.2  主要內容與基本要求…………………………..….…………………………..2
 1.2.3  設計指導思想…………………………..….……………………….…………..2
2 設計任務……………………………………………………………………………. . ….……4
 2.1  設計總任務………………………………………………………………………....……4
 2.2  工廠基本信息……………………………………………………………...... . ………...4
 2.3  氣象及地質資料…………………………………………………. . .…….……………..5
 2.4  當地電業部門提供的技術資料和供用電協議…………………. . .…….……………..6
3  總降壓變電所設計……………………………..................................7
 3.1  負荷分級及供電要求……………………………………….…………………….…….7
 3.2  負荷計算………………………………………………………………….…………...7
 3.3  電壓選擇……………………………….………………………………………………..9
 3.4  35kV變配電所主接線方案確定………………………………………………………..10
 3.5  主變壓器選擇…………………………………………………………………………..13
 3.6  無功補償………………………………………………………………………………..14
 3.7  短路電流的計算………………………………………………………………………..15
 3.8  高壓電器的選擇………………………………………………………………………..17
 4  高壓線路選擇……… ……………………………………………………………….….22
 4.1  線路選擇與校驗的項目及條件……………………………………………………..…22
 4.2  35kV高壓進線線路選擇與校驗………………………………………….……………22
 4.2.1  選擇校驗的方法……………….………………….………………………..…22
 4.2.2  按經濟電流密度和發熱條件選擇35kV高壓進線…….………………….…22
 4.3  10kV高壓出線線路的選擇與校驗…….………………….…………………………...23
 4.3.1  選擇校驗的方法…….………………….………………………...…………...23
 4.3.2  按發熱條件選擇6.3kV高壓出線…….………………………...…………...23
5  微機保護及綜合自動化系統設計. .……………………………………….…………..25
 5.1  變電所操作電源的選擇………………………………………………………………25
 5.2  變電所綜合自動化系統設計…………………………………………………………26
 5.3  變電所微機保護設計…………………………………………………………………26
6  防雷與接地設計…………………………………….………………………..……………29
 6.1  變電所的防雷保護…………………………….………………………..……….……29
 6.1.1  電力線路的防雷措施……………………………………………………..…29
      6.1.2  變配電所的防雷措施………………………………………………….…….29
 6.1.3  雷電侵入波的防護…………………………………………………….…….31
 6.2  變電所公共接地裝置的設計…………………………………………………...…….31
7  總結………………………………………………………………….……………………….32
致謝……………………………………………………………………………………………....33
參考文獻……………………………………………….……………………………………......34
附錄1……………………………………………….……………………………….......……......35

摘  要
 35kV變電所綜合自動化系統主要為無人值班形式，其設計應服從電網調度自動化的總體設計，其配置、功能包括設備的布置應滿足電網安全、優質、經濟運行以及信息分層傳輸、資源共享的原則。因此,本次設計我們將以此作為設計指導原則展開設計工作。整個設計過程包括總降壓變電所電氣設計、微機保護及綜合自動化系統設計、高壓線路選擇、防雷與接地設計。我們將從各種相關方案中比較確定出最佳設計方案。其中總降壓變電所采用內橋式的接線方式，所用電采用接地變壓器兼所用變壓器的形式。本次設計主要針對35KV變電所，通過對原始資料的分析進行相應的計算，確定變壓器臺數和容量，得出主接線，并完成選擇及校驗電氣設備、繼電保護及自動裝置配置，及防雷與接地，所址選擇等設計，整個設計基本包括了電氣部分的重要內容。
 
關鍵詞：電氣設計，綜合自動化，微機保護，防雷，高壓線
 
 Abstract
 35kV substation integrated automation system for unattended form, the design shall be subject to the power grid dispatching automation design, its configuration, features include the arrangement of equipment shall meet the power grid security, high-quality, layered economic operation and information transfer, the total resources the principle of entitlement. Therefore, this design we will use this as the guiding principles of design to start design work. The entire design process including the step-down substation electrical design, microprocessor-based protection and the integrated automation system design, high voltage transmission line option, the design of lightning protection and grounding. We will compare a variety of related programs to determine the best design.35kV substation integrated automation system for unattended form, the design shall be subject to the power grid dispatching automation design, its configuration, features include the arrangement of equipment shall meet the power grid security, high-quality, layered economic operation and information transfer, the total resources the principle of entitlement. Therefore, this design we will use this as the guiding principles of design to start design work. The entire design process including the step-down substation electrical design, microprocessor-based protection and the integrated automation system design, high voltage transmission line option, the design of lightning protection and grounding. We will compare a variety of related programs to determine the best design. The design aimed at 35KV substation, through the analysis of raw data for the corresponding calculation, to determine the number and capacity of transformers, to draw the main cables, and complete the selection and calibration of electrical equipment, relay protection and automatic device configuration, and lightning protection and grounding, the site selection of the design, including the entire design of the electrical part of the important content.

Keyword: Electrical design, integrated automation, microprocessor-based protection, lightning protection, high-tension line