電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)系(xi)(xi)統(tong)中(zhong)用途廣泛,是(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)系(xi)(xi)統(tong)中(zhong)重要(yao)的(de)工作元件。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器主(zhu)要(yao)的(de)兩種(zhong)形(xing)式為(wei)(wei)并聯(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器和(he)耦(ou)合電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器。并聯(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器裝置(zhi)作為(wei)(wei)一(yi)種(zhong)極為(wei)(wei)重要(yao)的(de)無功電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan),對(dui)于改善(shan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)系(xi)(xi)統(tong)結(jie)構,提(ti)高電(dian)(dian)(dian)(dian)(dian)(dian)(dian)能(neng)質量(liang)起著決定性的(de)作用。耦(ou)合電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器主(zhu)要(yao)承(cheng)擔電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)系(xi)(xi)統(tong)濾(lv)波、載波和(he)高頻(pin)保護任務(wu)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器在(zai)(zai)運行(xing)(xing)中(zhong)除長時間承(cheng)受工作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)外,還受到各(ge)種(zhong)內外過電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)作用而逐漸老(lao)化。運行(xing)(xing)條件下(xia)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器與輸(shu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)線路(lu)直(zhi)接聯(lian)接,采用常規檢測方法對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器進行(xing)(xing)檢測時,須使整個輸(shu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)線路(lu)停止運行(xing)(xing)才能(neng)進行(xing)(xing),影響(xiang)了生產。而且每年都曾因停電(dian)(dian)(dian)(dian)(dian)(dian)(dian)困難造成電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器預防性漏試,這對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器的(de)運行(xing)(xing)也(ye)留下(xia)隱(yin)患。
電力(li)電容(rong)器在(zai)線(xian)事(shi)故(gu)統計表明,局部放電現(xian)(xian)象(xiang)是(shi)(shi)電力(li)電容(rong)器普(pu)遍事(shi)故(gu)的初征兆,繼而(er)發展成部分元件的擊穿(chuan)短路故(gu)障。目前在(zai)線(xian)對電力(li)電容(rong)器的檢測(ce),通常是(shi)(shi)在(zai)線(xian)檢測(ce)在(zai)運行高壓下流(liu)過這些(xie)電容(rong)試品的電流(liu)I、C和(he)tgσ,來(lai)判斷電力(li)電容(rong)器是(shi)(shi)否故(gu)障。而(er)電容(rong)量(liang)的變化(hua)(hua)和(he)介(jie)質損(sun)耗角的變化(hua)(hua)是(shi)(shi)放電積累到一定程度以(yi)后(hou),產生(sheng)的一個(ge)滯后(hou)的結果。采用直接(jie)對放電現(xian)(xian)象(xiang)的監測(ce),能(neng)夠更早,更及時地(di)發現(xian)(xian)和(he)防(fang)范事(shi)故(gu)的發生(sheng)。因(yin)此對電力(li)電容(rong)器局部放電現(xian)(xian)象(xiang)進行監測(ce)是(shi)(shi)防(fang) 止電力(li)電容(rong)器事(shi)故(gu)的有效途徑。
電(dian)(dian)力電(dian)(dian)容器是一種靜止(zhi)的(de)(de)無功補償(chang)設(she)備。它的(de)(de)主(zhu)要作(zuo)用(yong)是向電(dian)(dian)力系(xi)統提供無功功率,提高功率因(yin)數。采用(yong)就(jiu)地無功補償(chang),可以減少輸電(dian)(dian)線(xian)路(lu)輸送電(dian)(dian)流,起到減少線(xian)路(lu)能量損耗和壓降,改善電(dian)(dian)能質量和提高設(she)備利用(yong)率的(de)(de)重要作(zuo)用(yong)。
在(zai)接觸自電(dian)網斷開的(de)電(dian)容(rong)(rong)器(qi)的(de)導電(dian)部分前,即使電(dian)容(rong)(rong)器(qi)已經自動放電(dian),還須用絕緣的(de)接地金(jin)屬桿(gan),短接電(dian)容(rong)(rong)器(qi)的(de)出線端,進行單獨放電(dian)。
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