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電力直流屏電池和充電系統的選擇

2019/6/10 14:32:13??????點擊:
電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)屏(ping)(ping)是(shi)(shi)高(gao)壓配電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)設(she)(she)備,是(shi)(shi)整(zheng)個配電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)室的(de)(de)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)系(xi)(xi)統(tong),有(you)時候也可(ke)以根據情況(kuang)配合(he)交(jiao)流(liu)(liu)(liu)(liu)屏(ping)(ping)使(shi)用(yong)(yong),組成交(jiao)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)(xi)統(tong)。直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)屏(ping)(ping)主要應(ying)用(yong)(yong)于大型水力(li)、火力(li)發電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)廠,各類變電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)站和其它使(shi)用(yong)(yong)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)設(she)(she)備的(de)(de)用(yong)(yong)戶,給(gei)信號設(she)(she)備、保(bao)護、自動裝置、事故照明、應(ying)急電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)及(ji)斷(duan)(duan)路器分(fen)、合(he)閘操作提供直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)設(she)(she)備。直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)系(xi)(xi)統(tong)是(shi)(shi)一個獨立(li)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan),不受發電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)、廠用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)及(ji)系(xi)(xi)統(tong)運(yun)行方式的(de)(de)影響(xiang)。在(zai)外部交(jiao)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)中斷(duan)(duan)情況(kuang)下,蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池提供直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan),把儲蓄在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池內的(de)(de)多余電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)量用(yong)(yong)來給(gei)高(gao)壓柜合(he)閘分(fen)閘、保(bao)護設(she)(she)備、應(ying)急照明系(xi)(xi)統(tong)等供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)。直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)屏(ping)(ping)的(de)(de)可(ke)靠性(xing)和安全(quan)性(xing)直(zhi)(zhi)(zhi)接影響(xiang)到電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)系(xi)(xi)統(tong)供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)可(ke)靠性(xing)和安全(quan)性(xing)。因(yin)(yin)此,在(zai)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)屏(ping)(ping)的(de)(de)選擇上因(yin)(yin)從以下幾個方面著手:
(1)蓄(xu)電池的選擇(ze)
不間斷供電(dian)設備,直(zhi)流(liu)蓄電(dian)池是核心部件。初(chu)期(qi)的直(zhi)流(liu)電(dian)源(yuan)系統大多使用(yong)普通鉛酸(suan)電(dian)池,其過載(zai)能(neng)力低,容易產生酸(suan)腐蝕等問題。逐漸隨著人們(men)對堿性鎘(ge)鎳(nie)電(dian)池的認識,以及和原鉛酸(suan)電(dian)池做比(bi)較,總(zong)結(jie)得出堿性鎘(ge)鎳(nie)電(dian)池有以下優(you)點:
1、良好的機械強(qiang)度(du),體積較小,能承受強(qiang)大的沖擊和振(zhen)動,不易損壞。
2、壓降小(xiao),自放電引起的能量損失小(xiao)。
3、過放電能力強,不會因(yin)為過充(chong)引(yin)起內部短路
4、放電(dian)電(dian)壓(ya)平穩(wen),壽命長,若(ruo)合理使用,可高達3000多(duo)個(ge)使用周(zhou)期。
5、根據以上堿(jian)性鎘鎳電(dian)池的優勢,直流系統負載較(jiao)重(zhong)、過載可能大(如作(zuo)(zuo)為電(dian)磁操作(zuo)(zuo)機構的操作(zuo)(zuo)電(dian)源)、安裝地(di)點環境良好、環境溫(wen)度不高且具備較(jiao)強維護力量的情況下,就可選(xuan)用堿(jian)性鎘鑷電(dian)池。反之(zhi),可選(xuan)用免(mian)維護的鉛酸(suan)電(dian)池。
(2)充(chong)電(dian)系統的(de)選擇(ze)
充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)設(she)備(bei)方面,目前(qian)使用較(jiao)多(duo)的(de)(de)是可(ke)(ke)(ke)控(kong)硅(gui)相控(kong)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)系統(tong),對(dui)電(dian)(dian)(dian)(dian)池的(de)(de)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)分為主充(chong)(chong)(chong)與浮充(chong)(chong)(chong)兩個(ge)階段,充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)(liu)分大(da)電(dian)(dian)(dian)(dian)流(liu)(liu)強充(chong)(chong)(chong)和涓流(liu)(liu)兩種方式。而控(kong)制(zhi)方式常見的(de)(de)有熱傳感(gan)器(qi)(qi)法、定時(shi)法、負(fu)序電(dian)(dian)(dian)(dian)壓斜率(lv)法、伏(fu)安法等。近年來(lai)眾多(duo)生(sheng)產廠(chang)家(jia)對(dui)此(ci)(ci)類(lei)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)系統(tong),主要(yao)在(zai)其(qi)(qi)控(kong)制(zhi)技術上不(bu)斷(duan)改進,如集成(cheng)電(dian)(dian)(dian)(dian)路技術、PLC技術、微機(ji)監控(kong)、"三遙"通訊(xun)等技術不(bu)斷(duan)融(rong)合其(qi)(qi)中,使相控(kong)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)設(she)備(bei)系統(tong)的(de)(de)可(ke)(ke)(ke)靠(kao)性不(bu)斷(duan)完善,因(yin)而目前(qian)此(ci)(ci)類(lei)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)屏(ping)系統(tong),其(qi)(qi)產品的(de)(de)可(ke)(ke)(ke)靠(kao)性與實(shi)用性基本(ben)能(neng)令人滿意。但相控(kong)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)機(ji)仍存在(zai)輸(shu)出電(dian)(dian)(dian)(dian)壓諧波(bo)(bo)大(da)、電(dian)(dian)(dian)(dian)流(liu)(liu)紋波(bo)(bo)大(da),穩流(liu)(liu)精(jing)度較(jiao)難提高(gao)的(de)(de)不(bu)足。同時(shi)由于其(qi)(qi)一(yi)(yi)般最(zui)多(duo)采用主從備(bei)份的(de)(de)方式,在(zai)某些場合,系統(tong)可(ke)(ke)(ke)靠(kao)性仍令人感(gan)到(dao)美中不(bu)足。所以(yi),國(guo)外在(zai)一(yi)(yi)些對(dui)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)源要(yao)求(qiu)較(jiao)高(gao)的(de)(de)場合逐(zhu)步采用一(yi)(yi)種較(jiao)為新型(xing)的(de)(de)高(gao)頻開關電(dian)(dian)(dian)(dian)源,整體(ti)結構采用模塊(kuai)組合方式,其(qi)(qi)模塊(kuai)原理圖如下,即先將三相交(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)整流(liu)(liu)為相控(kong)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu),再變換為高(gao)頻交(jiao)(jiao)流(liu)(liu),高(gao)頻交(jiao)(jiao)流(liu)(liu)再經變壓器(qi)(qi)隔離、全橋整流(liu)(liu)、濾波(bo)(bo)轉(zhuan)換為穩定的(de)(de)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)輸(shu)出。此(ci)(ci)種直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)源的(de)(de)最(zui)大(da)特點(dian)是穩流(liu)(liu)精(jing)度高(gao),紋波(bo)(bo)較(jiao)小(xiao),諧波(bo)(bo)失真(zhen)小(xiao),是一(yi)(yi)種高(gao)質量的(de)(de)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)源。在(zai)組成(cheng)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)系統(tong)時(shi),可(ke)(ke)(ke)采用N個(ge)單(dan)元模塊(kuai)組合的(de)(de)方式提供直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)輸(shu)出,因(yin)而備(bei)份程度高(gao),直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)系統(tong)整體(ti)可(ke)(ke)(ke)靠(kao)性較(jiao)高(gao)。此(ci)(ci)類(lei)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)源目前(qian)國(guo)內已有廠(chang)家(jia)生(sheng)產,但在(zai)整體(ti)外觀(guan)等方面略遜(xun)于傳統(tong)相控(kong)直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)屏(ping),企業(ye)在(zai)選擇直(zhi)(zhi)(zhi)(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)源時(shi)可(ke)(ke)(ke)進行比(bi)較(jiao)取舍(she)。
(3)直流屏系統(tong)維(wei)護
鎘鎳電池在(zai)使用中應(ying)主(zhu)要(yao)注(zhu)意以下問題:
1)定期對電(dian)池組進行大功(gong)率的(de)充(chong)、放(fang)電(dian),以激活電(dian)池內部的(de)化(hua)學物(wu)質,降低電(dian)池惰性,恢復(fu)電(dian)池容量。
2)經(jing)常檢查電(dian)(dian)池液位,在電(dian)(dian)池滿容量(liang)時(shi)(shi)對過高(gao)、過低的電(dian)(dian)池液位及(ji)時(shi)(shi)進(jin)行調整。
3)定期檢查(cha)電(dian)池(chi)溶(rong)液濃度,發現比重(zhong)變化時予以(yi)補堿液或加水(shui),必要(yao)時重(zhong)新配制電(dian)解液。
4)定(ding)期逐個檢查(cha)電(dian)池端電(dian)壓(ya),對個別電(dian)壓(ya)下(xia)降較大(da)的電(dian)池,單獨進(jin)行"活化"處理。
5)注(zhu)意電(dian)池(chi)環境溫度,最好(hao)使(shi)電(dian)池(chi)在(zai)40℃以(yi)下溫度運行,以(yi)免加劇(ju)電(dian)池(chi)的自放電(dian),引(yin)起電(dian)池(chi)容量下降。
6)保持電(dian)池清潔及環境(jing)干爽,以免發生電(dian)池爬堿(jian),導致(zhi)電(dian)池容量下降(jiang)和引起直流系(xi)統絕緣降(jiang)低(di)。平時及檢修時對電(dian)池外溢的堿(jian)液應及時用干布擦凈,切不(bu)
可用(yong)水沖洗電池(chi)外部。
與鎘鎳電(dian)池(chi)相比,免(mian)維(wei)護鉛(qian)酸電(dian)池(chi)的維(wei)護運行中維(wei)護工作量較小,平時(shi)只需注意檢查電(dian)池(chi)各連接完(wan)好,保持連接無銹(xiu)蝕(shi)、腐蝕(shi);觀察電(dian)池(chi)是(shi)否出現(xian)漲肚(du)、變形;密封閥是(shi)否完(wan)好;電(dian)極柱有(you)無熔(rong)融(rong)跡(ji)象;以及(ji)保持電(dian)池(chi)清(qing)潔干燥(zao)等等。同時(shi)定(ding)期檢查電(dian)池(chi)單(dan)體端(duan)電(dian)壓,及(ji)時(shi)發現(xian)處(chu)理失(shi)效電(dian)池(chi)。
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