【正文】 耐油性能好，老化時(shí)間較慢，適宜作室外架空線及進(jìn)戶線。熔斷器的動(dòng)作 系數(shù)大而自動(dòng)開關(guān)的動(dòng)作系數(shù)較小。短路大多因線路的絕緣破壞而引起，過載則主要因用電負(fù)荷的盲目增加而引起。 (3) 三 級(jí)負(fù)荷 不屬于一級(jí)和二級(jí)的電力負(fù)荷。 ② 中斷供電將在政治、經(jīng)濟(jì)上造成重大損失時(shí)。 ① 備用照明的轉(zhuǎn)換時(shí)間不應(yīng)大于 15s。 已知 ????A ， 20 W/?P ， W80L ?P 求得 1480 ???? P APn ③ 教師辦公室：安裝雙管的熒光燈。 設(shè)計(jì)中 熒光燈 均 采用吊桿安裝，桿長為 。 為限制直射產(chǎn)生的眩光 ， 對(duì)于一般高 為 ~ 的房間 ，考慮燈具的檢修和照明的效率，不希望燈具掛得太高， 通常在 ~ 之間 [5]。 本設(shè)計(jì)聯(lián)系實(shí)際，考慮到 上述 要求 及 學(xué)生的學(xué)習(xí)照度要求 ， 普通教室采用帶反射罩的 配 罩 型熒光燈具， 型號(hào)為 YZ40RL。仰角以上。因此，應(yīng)保證教室有足夠的采光。 第二章為 燈具選擇及 照明計(jì)算。 最后，利用 AUTOCAD 及天正電氣軟件，根據(jù)提供的土建施工平面圖，畫出電氣工程圖、配電系統(tǒng)圖和弱電圖。 關(guān)鍵詞： 建筑電氣 ； 照度計(jì)算 ； 負(fù)荷計(jì)算 ； 系統(tǒng)圖 全套圖紙，加 153893706蘭州交通大學(xué)畢業(yè)設(shè)計(jì)（論文） II Abstract The design is based on Building Electricity,in the principle of low energy consumption, environmental protection and utility, according to the information which is about engineering design, referring to relevant norms and standards which are related to Building Electricity, and then ing up with a reasonable design of power supply and distribution system, lighting system, lightcurrent system, lightning protection system respectively. Setting up lighting and calculating illumination are important parts of lighting design, which affect the quality of lighting design directly. The methods of calculating illumination are unit power law, utilizing factor method and Bypoint method. In this design, the author use unit power law to determine how many lightings should be set up. In addition, the design describs in detail how to select lightings and fix them. Besides, the paper also prehensively describes the load calculation, lowvoltage protection device selection and wire selection. The methods of calculating load are required coefficient method and binomial coefficient method, in the paper, we calculated through required coefficient method. In the selection of lowvoltage protection device, the paper describes how to select breaker and automatic switch. When choose a wire, its material, insulating sheath and carrying capacity should be taken into consideration. At last, according to Civil Construction Plans, AUTOCAD and Tianzheng Electrical Software are used to draw Electrical Engineering Drawings, distribution system maps and lightcurrent system figures. Key words： Building electricity， Illumination calculation， Load calculation， System diagram 蘭州交通大學(xué)畢業(yè)設(shè)計(jì)（論文） III 目 錄 摘 要 ..................................................................................................................................... I Abstract ...................................................................................................................................... II 1 緒論 ........................................................................................................................................ 1 建筑電氣概況 ............................................................................................................. 1 設(shè)計(jì)原則及依據(jù) ......................................................................................................... 1 設(shè)計(jì)內(nèi)容 ..................................................................................................................... 2 2 燈具選擇及照明計(jì)算 ............................................................................................................ 3 學(xué)校照明要求及燈具選擇 ......................................................................................... 3 學(xué)校照明 .......................................................................................................... 3 光源、燈具選擇及燈具布置 .......................................................................... 4 照明計(jì)算方法 ............................................................................................................. 5 本設(shè)計(jì)照度計(jì)算 ......................................................................................................... 8 應(yīng)急照明的設(shè)計(jì) ....................................................................................................... 10 3 負(fù)荷計(jì)算及低壓電器選擇 .................................................................................................. 12 負(fù)荷分級(jí)及供電要求 ............................................................................................... 12 負(fù)荷計(jì)算 ................................................................................................................... 13 需要系數(shù)法 .................................................................................................... 13 本設(shè)計(jì)負(fù)荷計(jì)算 ............................................................................................ 14 低壓保護(hù)裝置的選擇 ............................................................................................... 16 熔斷器的選擇方法 ........................................................................................ 16 自動(dòng)開關(guān)的選擇方法 .................................................................................... 17 電纜及導(dǎo)線選擇 ....................................................................................................... 18 導(dǎo)線概述 ........................................................................................................ 18 電纜及導(dǎo)線截面的選擇方法 ........................................................................ 19 室內(nèi)配 電線路的敷設(shè) .................................................................................... 20 本設(shè)計(jì)選用的導(dǎo)線線型及敷設(shè)方式 ............................................................ 21 插座選擇原則 ........................................................................................................... 21 插座選擇原則 ................................................................................................ 21 插座安裝 ........................................................................................................ 22 4 照明供配電系統(tǒng)設(shè)計(jì) .......................................................................................................... 23 照明供電和設(shè)計(jì)的一般要求 ...................................................................................