110kV變電站電氣一次部分初步設(shè)計

摘  要

隨著電力技術(shù)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(lǐng)域中，通過新技術(shù)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(guān)鍵的環(huán)節(jié)也同樣在新技術(shù)領(lǐng)域得到了充分的發(fā)展。

根據(jù)設(shè)計任務書的要求，本次設(shè)計為110kV變電站電氣一次部分初步設(shè)計，并繪制電氣主接線圖及其他圖紙。首先，進行了電氣主接線的選擇，把電氣主接線分為110kV、35kV和10kV三個電壓等級，經(jīng)過各個方案的優(yōu)缺點比較，確定了各個電壓等級分別采用單母線分段帶旁母接線、單母線分段帶旁母接線和單母線分段接線。其次，根據(jù)要求進行了主變壓器的選擇、短路電流計算、主要電氣設(shè)備選擇及校驗，包括斷路器、隔離開關(guān)、電流互感器、電壓互感器、母線等。最后，對防雷保護和接地方案的設(shè)計進行了選擇。

關(guān)鍵詞：變電站；主變壓器； 防雷保護  

ABSTRACT

Along with the economic development and the modern industry developments of quick rising, the design of the power supply system become more and more completely and system. Because the quickly increase electricity of factories, it also increases seriously to the dependable index of the economic condition, power supply in quantity. Therefore they need the higher and more perfect request to the power supply. Whether Design reasonable, not only affect directly the base investment and circulate the expenses with have the metal depletion in colour metal, but also will reflect the dependable in power supply and the safe in many facts. In a word, it is close with the economic performance and the safety of the people. 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.

From the guide of engineering design assignment, we have to design primary power-system of 110kV substation and draw main electrical one-line diagram and others. First, the main electrical connection can be divided into three voltage grades: 110kV, 35kV with 10kV.It deposits sectionalized single bus bar scheme, sectionalized single and sectionalized single bus bar scheme per grade. Second, there is a design for main electrical connection in this engineering, the calculation for short-circuit electric current,  the selection of electrical device and calibration including circuit breaker,  isolator, current，transformer, potential transformer ,bus bar etc. At last, the design for distribution installation per voltage grade and lightning protection is also included.  

Keywords：substation; the main transformer; lightning protection

目錄

1引言 1

1.1設(shè)計的目的與意義 1

1.2負荷情況及分析 1

1.3設(shè)計的任務 2

2電氣主接線及設(shè)計 3

2.1 電氣主接線設(shè)計的基本要求 3

2.2 主接線接線方式概述 4

2.2.1 110kV電氣主接線 6

2.2.2 35kV電氣主接線 8

2.2.3 10kV電氣主接線 9

3主變壓器的選擇 11

3.1 主變壓器臺數(shù)的確定 11

3.2主變壓器容量的選擇 11

3.3 繞組數(shù)量和連接形式的選擇 12

3.4 主變型式的選擇 13

3.5 冷卻方式的選擇 13

3.6主變型號的選擇 13

4短路電流的計算 15

4.1計算短路電流的目的 15

4.2短路電流的計算步驟及結(jié)果 16

5電氣設(shè)備的選擇與校驗 23

5.1 電氣設(shè)備選擇的一般條件 23

5.2 斷路器的選擇 25

5.2.1斷路器種類選擇 25

5.2.2斷路器型號的選擇和校驗 26

5.3隔離開關(guān)的選擇 28

5.4電流互感器的選擇 31

5.5 電壓互感器的選擇 34

5.6母線的選擇 35

6防雷與接地方案的設(shè)計 38

6.1 防雷設(shè)計 38

6.1.1防雷設(shè)計原則 38

6.1.2 避雷器的選擇 38

6.1.3 避雷針的配置 41

6.2 接地設(shè)計 42

6.2.1 接地設(shè)計的原則 42

6.2.2 接地網(wǎng)型式選擇及優(yōu)劣分析 43

7結(jié)論與展望 44

致   謝 45

參考文獻 46