110kV變電站電氣一次部分初步設(shè)計(jì)

摘  要

隨著電力技術(shù)高新化、復(fù)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(guò)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(gè)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(jì)任務(wù)書(shū)的要求，本次設(shè)計(jì)為110kV變電站電氣一次部分初步設(shè)計(jì)，并繪制電氣主接線(xiàn)圖及其他圖紙。首先，進(jìn)行了電氣主接線(xiàn)的選擇，把電氣主接線(xiàn)分為110kV、35kV和10kV三個(gè)電壓等級(jí)，經(jīng)過(guò)各個(gè)方案的優(yōu)缺點(diǎn)比較，確定了各個(gè)電壓等級(jí)分別采用單母線(xiàn)分段帶旁母接線(xiàn)、單母線(xiàn)分段帶旁母接線(xiàn)和單母線(xiàn)分段接線(xiàn)。其次，根據(jù)要求進(jìn)行了主變壓器的選擇、短路電流計(jì)算、主要電氣設(shè)備選擇及校驗(yàn)，包括斷路器、隔離開(kāi)關(guān)、電流互感器、電壓互感器、母線(xiàn)等。最后，對(duì)防雷保護(hù)和接地方案的設(shè)計(jì)進(jìn)行了選擇。

關(guān)鍵詞：變電站；主變壓器； 防雷保護(hù)  

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(jì)的目的與意義 1

1.2負(fù)荷情況及分析 1

1.3設(shè)計(jì)的任務(wù) 2

2電氣主接線(xiàn)及設(shè)計(jì) 3

2.1 電氣主接線(xiàn)設(shè)計(jì)的基本要求 3

2.2 主接線(xiàn)接線(xiàn)方式概述 4

2.2.1 110kV電氣主接線(xiàn) 6

2.2.2 35kV電氣主接線(xiàn) 8

2.2.3 10kV電氣主接線(xiàn) 9

3主變壓器的選擇 11

3.1 主變壓器臺(tái)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(hào)的選擇 13

4短路電流的計(jì)算 15

4.1計(jì)算短路電流的目的 15

4.2短路電流的計(jì)算步驟及結(jié)果 16

5電氣設(shè)備的選擇與校驗(yàn) 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(lèi)選擇 25

5.2.2斷路器型號(hào)的選擇和校驗(yàn) 26

5.3隔離開(kāi)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(xiàn)的選擇 35

6防雷與接地方案的設(shè)計(jì) 38

6.1 防雷設(shè)計(jì) 38

6.1.1防雷設(shè)計(jì)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(jì) 42

6.2.1 接地設(shè)計(jì)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(xiàn) 46