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    負荷分級及供電有哪些要求?負荷等級又是怎么劃分的?
    RSS 打印 復制鏈接 發布時間:2019-06-03 16:59:16

    什么是負荷等級

    用電設備所消耗的功率稱為電力負荷。用電設備對供電的可靠性是分等級的,所以就對負荷進行了等級劃分。

    同樣根據建筑物的重要程度,中斷供電造成的損失或影響,也對負荷進行了等級劃分。

    負荷等級的劃分

    民用建筑用電負荷根據建筑物重要性或用電設備對供電可靠性的要求分為三級:即為一級負荷(含特別重要負荷)、二級負荷及三級負荷。

    T1sRbgBsxv1RCvBVdK.jpg

    01符合下列情況之一時,應為一級負荷

    1)中斷供電將造成人身傷亡;

    2)中斷供電將造成重大影響或重大損失;

    3)中斷供電將破壞有重大影響的用電單位的正常工作,或造成公共場所秩序嚴重混亂。

    例如:重要通信樞紐、重要交通樞紐、重要的經濟信息中心、

    特級或甲級體育建筑、國賓館、承擔重大國事活動的會堂、經常用于重要國際活動的大量人員集中的公共場所等的重要用電負荷。

    在一級負荷中,當中斷供電將發生中毒、爆炸和火災等情況的負荷,以及特別重要場所的不允許中斷供電的負荷,應為特別重要的負荷。

    02符合下列情況之一時,應為二級負荷

    1)中斷供電將造成較大影響或損失;

    2)中斷供電將影響重要用電單位的正常工作或造成公共場所秩序混亂。

    例如:高層普通建筑、甲等電影院、中型百貨商店、大型冷庫等為二級負荷用戶。其中對于這些二級負荷用戶中的客梯電力、主要通道照明等 用電設備為二級負荷設備。

    03不屬于一級和二級的用電負荷應為三級負荷。

    民用建筑中各類建筑物的主要用電負荷等級表,參見《民用建筑電氣設計規范附錄A表》

    2.jpg

    3.jpg

    注:

    1、負荷等級表中“一級*”為一級負荷中特別重要負荷;

    2、各類建筑的分級見現行的有關設計規范;

    3、本表未包含消防

    負荷分級,消防負荷分級見第3.2.3條及相關的國家標準、規范;

    4、當序號1~23各類建筑物與一類或二類高層建筑的用電負荷級別不相同時,負荷級別應按其中高者確定。

    總結:       

    ★用戶負荷等級,就是對引入外電源供電可靠性的要求。對外電源供電可靠性的分析,一般需考慮:上級配網的電壓等級、網絡的構成、變配電站的形式及數量;供電線路敷設方式、方向、路由以及可能受到電網一次故障停電的影響程度等。用戶負荷等級的確定,取決于該用戶用電設備最高負荷的等級。   

    ★ 用電設備負荷等級,就是指用電設備對供電的系統電源可靠性的要求。

    民用建筑中消防用電負荷等級的確定

    1、一類高層民用建筑的消防控制室、火災自動報警及聯動控制裝置、火災應急照明及疏散指示標志、防煙及排煙設施、自動滅火系統、消防水泵、消防電梯及其排水泵、電動的防火卷簾及門窗以及閥門等消防用電應為一級負荷;二類高層民用建筑內的上述消防用電應為二級負荷。    

    2、特、甲等劇場,本條1款所列的消防用電應為一級負荷,乙、丙等劇場應為二級負荷;    

    3、特級體育場館的應急照明為一級負荷中的特別重要負荷;甲級體育場館的應急照明為一級負荷。

    各級負荷的電源要求

    一級負荷應由兩個電源供電,當一個電源發生故障時,另一個電源不應同時受到損壞。對于一級負荷中的特別重要負荷,應增設應急電源,并嚴禁將其他負荷接入應急供電系統。

    二級負荷的供電系統,宜由兩回線路供電。在負荷較小或地區供電條件困難時,二級負荷可由一回路6kV及以上專用的架空線路或電纜供電。當采用架空線時,可為一回路架空線供電;當采用電纜線路時,應采用兩根電纜組成的線路供電,其每根電纜應能承受100%的二級負荷。

    三級負荷可按約定供電。

    1.png

    變配電室兩臺變壓器

    2.png

    柴油發電機組

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