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油浸式變壓器的驅動保護

2024 - 4 - 26

被閱讀:123次

簡(jian)單的(de)(de)(de)(de)油浸式(shi)變壓(ya)器就是起到改變控制線路(lu)的(de)(de)(de)(de)作用。它相當于一個(ge)(ge)開關,而另一個(ge)(ge)就是增(zeng)加電流的(de)(de)(de)(de)作用。其實(shi),油浸式(shi)變壓(ya)器的(de)(de)(de)(de)作用和(he)一般油浸式(shi)變壓(ya)器的(de)(de)(de)(de)功(gong)能是一致的(de)(de)(de)(de)

簡(jian)單的(de)油浸式變壓(ya)器(qi)就是起到改變控制(zhi)線路的(de)作(zuo)用(yong)。它相當于一(yi)(yi)(yi)個開關,而另一(yi)(yi)(yi)個就是增加(jia)電(dian)流的(de)作(zuo)用(yong)。其實,油浸式變壓(ya)器(qi)的(de)作(zuo)用(yong)和一(yi)(yi)(yi)般油浸式變壓(ya)器(qi)的(de)功能是一(yi)(yi)(yi)致的(de),主(zhu)要起到“開關”的(de)作(zuo)用(yong)干(gan)式變壓(ya)器(qi)。

①保(bao)護控(kong)(kong)制(zhi)(zhi)開關(guan):控(kong)(kong)制(zhi)(zhi)開關(guan)只控(kong)(kong)制(zhi)(zhi) 油浸(jin)式變(bian)壓(ya)器(qi)(qi)線圈的(de)通(tong)斷,由 油浸(jin)式變(bian)壓(ya)器(qi)(qi)線圈產生(sheng)的(de)力來(lai)通(tong)斷控(kong)(kong)制(zhi)(zhi)開關(guan)要控(kong)(kong)制(zhi)(zhi)的(de)電路。加(jia) 油浸(jin)式變(bian)壓(ya)器(qi)(qi)后,控(kong)(kong)制(zhi)(zhi)開關(guan)只流(liu)(liu)過較小的(de) 油浸(jin)式變(bian)壓(ya)器(qi)(qi)線圈電流(liu)(liu),因而開關(guan)就(jiu)不容易(yi)損(sun)壞,使用壽命(ming)得以延長。

②實現(xian)自動(dong)(dong)(dong)控(kong)制(zhi):一些 油(you)浸(jin)(jin)(jin)式(shi)變(bian)(bian)(bian)壓器線圈電(dian)(dian)(dian)(dian)(dian)流由(you)電(dian)(dian)(dian)(dian)(dian)路中的某個工作電(dian)(dian)(dian)(dian)(dian)壓控(kong)制(zhi),當(dang)電(dian)(dian)(dian)(dian)(dian)路中的受控(kong)電(dian)(dian)(dian)(dian)(dian)壓達到設定(ding)的 油(you)浸(jin)(jin)(jin)式(shi)變(bian)(bian)(bian)壓器動(dong)(dong)(dong)作電(dian)(dian)(dian)(dian)(dian)壓時, 油(you)浸(jin)(jin)(jin)式(shi)變(bian)(bian)(bian)壓器觸點(dian)改(gai)變(bian)(bian)(bian)工作狀態,從而實現(xian)自動(dong)(dong)(dong)控(kong)制(zhi)。比如,起動(dong)(dong)(dong)機驅動(dong)(dong)(dong)保護 油(you)浸(jin)(jin)(jin)式(shi)變(bian)(bian)(bian)壓器就可在發(fa)動(dong)(dong)(dong)機起動(dong)(dong)(dong)后,發(fa)電(dian)(dian)(dian)(dian)(dian)機發(fa)電(dian)(dian)(dian)(dian)(dian),由(you)發(fa)電(dian)(dian)(dian)(dian)(dian)機的中點(dian)電(dian)(dian)(dian)(dian)(dian)壓使 油(you)浸(jin)(jin)(jin)式(shi)變(bian)(bian)(bian)壓器觸點(dian)打(da)開,自動(dong)(dong)(dong)斷(duan)開起動(dong)(dong)(dong)機開關的電(dian)(dian)(dian)(dian)(dian)路。

  (1) 變(bian)(bian)壓(ya)器(qi)防止誤(wu)入(ru)帶電間隔這(zhe)一功能使得 變(bian)(bian)壓(ya)器(qi)的(de)柜門的(de)開閉與接地開關有閉鎖(suo)關系,即只有合上接地開關后(hou)才能打開 變(bian)(bian)壓(ya)器(qi)門,此次事故暴露出舊型號 變(bian)(bian)壓(ya)器(qi)的(de)“五防 ”機械(xie)閉鎖(suo)裝置存在不完(wan)善的(de)問題。

  (2) 變壓器驗(yan)電(dian)(dian)問題是一個多(duo)年來困擾(rao)電(dian)(dian)力(li)安全生產的(de)問題,如(ru)今(jin)推廣的(de)全封(feng)閉型“五(wu)防” 變壓器的(de)機械“五(wu)防” 閉鎖裝置,無(wu)法(fa)滿足安全規程(cheng)“變壓器廠家先(xian)驗(yan)電(dian)(dian)、后(hou)掛(gua)接地(di)線”的(de)要求(qiu)。因為(wei)在執行停(ting)電(dian)(dian)工作(zuo)時,在合接地(di)開關前(qian)必須驗(yan)明設備已無(wu)電(dian)(dian)壓。然而封(feng)閉式(shi) 變壓器處于全封(feng)閉狀態,按照正常的(de)操作(zuo)方 法(fa),無(wu)法(fa)用攜帶式(shi)驗(yan)電(dian)(dian)器對設備進行驗(yan)電(dian)(dian),因此,就出現了(le)強行解(jie)鎖打(da)開 變壓器柜(ju)門(men)的(de)方式(shi)驗(yan)電(dian)(dian)。

  (3) 變壓器上大量使用(yong)(yong)以氖(nai)燈作為(wei)顯(xian)(xian)(xian)示(shi)(shi)(shi)元件的(de)帶(dai)電(dian)顯(xian)(xian)(xian)示(shi)(shi)(shi)裝(zhuang)置(zhi),經過(guo)長時間(jian)的(de)運(yun)(yun)行(xing)(xing)使用(yong)(yong),發現失明率高(gao),氖(nai)泡(pao)出(chu)現大量損壞。為(wei)了彌補(bu)缺陷,在帶(dai)電(dian)顯(xian)(xian)(xian)示(shi)(shi)(shi)裝(zhuang)置(zhi)上裝(zhuang)設了氖(nai)燈運(yun)(yun)行(xing)(xing)/關(guan)(guan) 閉(bi)開(kai)關(guan)(guan),平時該開(kai)關(guan)(guan)處(chu)于關(guan)(guan)閉(bi)狀(zhuang)態,從而使得整(zheng)個帶(dai)電(dian)顯(xian)(xian)(xian)示(shi)(shi)(shi)裝(zhuang)置(zhi)暫時退出(chu)運(yun)(yun)行(xing)(xing)。這種處(chu)理方式,失去了帶(dai)電(dian)顯(xian)(xian)(xian)示(shi)(shi)(shi)裝(zhuang)置(zhi)作為(wei)監視線路側帶(dai)電(dian)與否的(de)作用(yong)(yong)。

  (4)氖(nai)燈亮度低,特別(bie)是(shi)在(zai)明(ming)亮的環境里亮度受到沖(chong)刷,顯示(shi)性(xing)較差。

  (5)老式帶有強制性 變壓(ya)器(qi)閉(bi)鎖(suo)的帶電(dian)顯示裝置(zhi),閉(bi)鎖(suo)原理過于(yu)簡單(dan),只是將A.B.C三相(xiang)傳感器(qi)輸(shu)出的信號(hao)分別進(jin)行半波整流后直(zhi)接復(fu)合(he)在一起(qi),去控制閉(bi)鎖(suo)回路。這(zhe)種方式在系統出現單(dan)相(xiang)接地(di)(di)或缺相(xiang)的異常情(qing)況時,因(yin)閉(bi)鎖(suo)控制電(dian)壓(ya)的飄移(yi)可(ke)以導致裝置(zhi)不能可(ke)靠閉(bi)鎖(suo)而(er)發(fa)生(sheng)帶電(dian)合(he)接地(di)(di)開關的事故(gu)。

  (6)目安裝(zhuang)的氖燈式帶(dai)電顯示裝(zhuang)置大多采用塑料外殼并安裝(zhuang)于設備間隔內(nei)(nei),一旦在操作(zuo)過程中(zhong)變壓器(qi)內(nei)(nei)部(bu)短路放弧,高溫電弧可能將裝(zhuang)置的塑料外殼熔化,傷及運行或檢(jian)修人(ren)員。


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