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  • 電壓暫降的起因及危害

    1、電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)暫(zan)(zan)降(jiang)(jiang)概念與定義電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)暫(zan)(zan)降(jiang)(jiang)或下(xia)跌是指供電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)有(you)效(xiao)值(zhi)(zhi)(zhi)(zhi)在(zai)短時間內突(tu)然下(xia)降(jiang)(jiang)又回升恢復的(de)(de)現象(xiang)。在(zai)電(dian)(dian)(dian)(dian)(dian)網中(zhong)(zhong)這種現象(xiang)的(de)(de)持(chi)續時間大多為0.1~1.5s。電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)暫(zan)(zan)降(jiang)(jiang)屬于(yu)兩(liang)維的(de)(de)電(dian)(dian)(dian)(dian)(dian)磁擾動,即電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)跌落的(de)(de)大小(殘壓(ya)(ya)或暫(zan)(zan)降(jiang)(jiang)深(shen)度)和(he)時間。殘壓(ya)(ya)是電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)暫(zan)(zan)降(jiang)(jiang)或短時間停電(dian)(dian)(dian)(dian)(dian)過程中(zhong)(zhong)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)方均根值(zhi)(zhi)(zhi)(zhi)的(de)(de)最小值(zhi)(zhi)(zhi)(zhi),殘壓(ya)(ya)可用伏(fu)特值(zhi)(zhi)(zhi)(zhi)或相對參(can)考電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)百分比值(zhi)(zhi)(zhi)(zhi)或標(biao)幺值(zhi)(zhi)(zhi)(zhi)表示。(有(you)專家這樣認為)在(zai)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)暫(zan)(zan)降(jiang)(jiang)的(de)(de)分析中(zhong)(zhong),通常將暫(zan)(zan)降(jiang)(jiang)時的(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)有(you)效(xiao)值(zhi)(zhi)(zhi)(zhi)與額定電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)有(you)效(xiao)值(zhi)(zhi)(zhi)(zhi)的(de)(de)比值(zhi)(zhi)(zhi)(zhi)

    2021-08-20

  • 中凱KB0系列控制與保護開關電器應用技術100問答5(7-8)6(1-4)

    5. KB0系列控(kong)(kong)(kong)制與保護開(kai)關電(dian)(dian)器(qi)產品分類(lei)及用途5-7 KB0派生產品有哪些類(lei)型(xing)?1. 隔離型(xing)、消防型(xing)、可(ke)逆型(xing)、雙電(dian)(dian)源自(zi)動(dong)轉換(huan)開(kai)關、雙速控(kong)(kong)(kong)制器(qi)、星三角減(jian)壓(ya)起(qi)動(dong)器(qi)、自(zi)耦減(jian)壓(ya)起(qi)動(dong)器(qi)、電(dian)(dian)阻減(jian)壓(ya)起(qi)動(dong)器(qi)、插入式板后接(jie)線(xian)型(xing)等(deng)產品。2. 級數:3、4級。3. 操作方式:通(tong)過(guo)電(dian)(dian)磁(ci)鐵帶動(dong)主(zhu)觸(chu)頭接(jie)通(tong)或斷開(kai)、同時接(jie)通(tong)或斷開(kai)無(wu)源輔助(zhu)觸(chu)頭,也可(ke)通(tong)過(guo)遠距(ju)離再扣器(qi)操作。4. 控(kong)(kong)(kong)制方式:自(zi)動(dong)—由主(zhu)令輔助(zhu)開(kai)關或程序控(kong)(kong)(kong)制器(qi)

    2021-02-22

  • 6月起電網企業新采購變壓器應為高效節能變壓器

    ?近日,工業和(he)信(xin)息化部、市場監(jian)管總局、國(guo)家能(neng)源局制(zhi)定《變(bian)(bian)壓器(qi)能(neng)效提升計劃(2021-2023年(nian))》(以下(xia)簡稱《計劃》),要求自2021年(nian)6月起,電(dian)(dian)網企(qi)業新采(cai)購變(bian)(bian)壓器(qi)應為高(gao)效節能(neng)變(bian)(bian)壓器(qi)。到(dao)(dao)2023年(nian),高(gao)效節能(neng)變(bian)(bian)壓器(qi)在網運(yun)行比例提高(gao)10%,當(dang)年(nian)新增(zeng)高(gao)效節能(neng)變(bian)(bian)壓器(qi)占比達到(dao)(dao)75%以上(shang)。  《計劃》指出(chu),我(wo)國(guo)在網運(yun)行的變(bian)(bian)壓器(qi)約(yue)1700萬臺,總容量約(yue)110億(yi)千伏安。變(bian)(bian)壓器(qi)損耗(hao)約(yue)占輸(shu)配電(dian)(dian)電(dian)(dian)力損耗(hao)的40

    2021-02-04

  • GB 51348-2019 問答 | 規范組官方獨家答疑

    國家(jia)(jia)標準(zhun)(zhun)(zhun)GB 51348 - 2019《民用(yong)建(jian)筑電氣設計標準(zhun)(zhun)(zhun)》(本專欄簡(jian)稱《民標》)自(zi)2020年8月(yue)1日起實施(shi),由(you)住房和城鄉建(jian)設部負責管理和對強制性(xing)條文的(de)解釋,由(you)中(zhong)國建(jian)筑東北設計研究院(yuan)有(you)限公司(si)負責具(ju)體技(ji)術內(nei)容的(de)解釋。GB 51348 - 2019國家(jia)(jia)標準(zhun)(zhun)(zhun)編制組獨家(jia)(jia)委托建(jian)筑電氣雜志社(she)在全國范圍(wei)內(nei)統一組織開展國家(jia)(jia)標準(zhun)(zhun)(zhun)的(de)宣(xuan)貫培訓工作(zuo),并收集整理宣(xuan)貫過(guo)程中(zhong)大家(jia)(jia)反映比較(jiao)集中(zhong)的(de)問題,由(you)GB 51348 - 2

    2021-02-04

  • 6月起電網企業新采購變壓器應為高效節能變壓器

     近日,工業和信息化部、市(shi)場監管總局、國(guo)家能(neng)源(yuan)局制(zhi)定《變(bian)(bian)(bian)壓(ya)(ya)器能(neng)效提升(sheng)計(ji)(ji)劃(2021-2023年)》(以下簡(jian)稱(cheng)《計(ji)(ji)劃》),要(yao)求(qiu)自2021年6月(yue)起,電網企業新采購變(bian)(bian)(bian)壓(ya)(ya)器應為高(gao)效節能(neng)變(bian)(bian)(bian)壓(ya)(ya)器。到(dao)2023年,高(gao)效節能(neng)變(bian)(bian)(bian)壓(ya)(ya)器在(zai)網運行(xing)比例提高(gao)10%,當年新增高(gao)效節能(neng)變(bian)(bian)(bian)壓(ya)(ya)器占比達到(dao)75%以上。  《計(ji)(ji)劃》指出,我(wo)國(guo)在(zai)網運行(xing)的變(bian)(bian)(bian)壓(ya)(ya)器約1700萬(wan)臺,總容量(liang)約110億千伏安。變(bian)(bian)(bian)壓(ya)(ya)器損耗(hao)約占輸配電電力損耗(hao)的40

    2021-02-04

  • 變壓器的十問十答,值得儲備的知識點

    變(bian)配電(dian)運行中,變(bian)壓器(qi)(qi)必不(bu)可(ke)少,熟悉和(he)掌握變(bian)壓器(qi)(qi)的(de)(de)(de)基(ji)本常識是(shi)(shi)非常有必要的(de)(de)(de),變(bian)壓器(qi)(qi)的(de)(de)(de)基(ji)本知識儲備是(shi)(shi)每一個電(dian)力人(ren)必備的(de)(de)(de)技(ji)能(neng)!以下(xia)關(guan)于變(bian)壓器(qi)(qi)的(de)(de)(de)十大疑問(wen)及解答將便于大家補充了解。1、什么叫變(bian)壓器(qi)(qi)?在交流電(dian)路中,將電(dian)壓升高或降低(di)的(de)(de)(de)設(she)備叫變(bian)壓器(qi)(qi),變(bian)壓器(qi)(qi)能(neng)把(ba)任(ren)一數(shu)值的(de)(de)(de)電(dian)壓轉變(bian)成(cheng)頻率(lv)相同的(de)(de)(de)我們(men)所需的(de)(de)(de)電(dian)壓值,以滿足電(dian)能(neng)的(de)(de)(de)輸送,分配和(he)使用(yong)(yong)要求。例如發(fa)電(dian)廠發(fa)出來的(de)(de)(de)電(dian),電(dian)壓等級較(jiao)(jiao)低(di),必須把(ba)電(dian)壓升高才能(neng)輸送到(dao)較(jiao)(jiao)遠的(de)(de)(de)用(yong)(yong)電(dian)區,用(yong)(yong)

    2021-01-14

  • 新標準,新高度,建筑電氣節能新要求

    《民用建筑電(dian)(dian)氣(qi)設計標準(zhun)》(以(yi)下(xia)簡稱(cheng)民標)GB 51348-2019第(di)24.1.3條(tiao)規定, 民用建筑電(dian)(dian)氣(qi)節(jie)能(neng)設計應選擇(ze)符合國家能(neng)效標準(zhun)規定的電(dian)(dian)氣(qi)產(chan)品(pin)和節(jie)能(neng)型(xing)電(dian)(dian)氣(qi)產(chan)品(pin)。而《電(dian)(dian)力變壓器(qi)能(neng)效限定值(zhi)及能(neng)效等(deng)級(ji)》(以(yi)下(xia)簡稱(cheng)能(neng)標)GB 20052-2020與(yu)新(xin)(xin)民標對比(bi),共同推動(dong)電(dian)(dian)氣(qi)節(jie)能(neng)設計。新(xin)(xin)能(neng)標于2021年6月1日實(shi)施。能(neng)標代替GB 24790-2009《電(dian)(dian)力變壓器(qi)能(neng)效限定值(zhi)及能(neng)效等(deng)級(ji)》和GB 20

    2021-01-14

  • 關于消防供配電線路中電線電纜的選型,這些注意事項一定要了解!

    一(yi)、電線(xian)電纜(lan)選型(xing)錯誤① 一(yi)類高層建筑(zhu)未選用低(di)煙(yan)無鹵電線(xian)電纜(lan)聚氯乙(yi)烯在高溫下的(de)燃燒過程中(zhong),會釋放出氯化氫(qing)、二惡英(ying)等大(da)量有毒(du)氣(qi)體,同時(shi)產生大(da)量的(de)黑色(se)(se)煙(yan)霧(wu)。發生火(huo)災時(shi),黑色(se)(se)煙(yan)霧(wu)阻擋視(shi)線(xian),增加了被困人員疏散(san)以(yi)及消防(fang)人員滅火(huo)和(he)(he)施救的(de)難度,被困人員吸(xi)入上述有毒(du)氣(qi)體后,會嚴重損(sun)害(hai)身體健康,甚至導(dao)致窒息死亡。為減少火(huo)災情況下人員傷亡和(he)(he)財(cai)產損(sun)失(shi),《民用建筑(zhu)電氣(qi)設計規范》JGJ16-2008第7.4.1條第

    2020-01-17

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