來源：力建數控母線機、母線加工機、銅排加工機、母排加工機生產廠家    責(ze)任編輯(ji)：01顧問

    數控母線沖剪機母排沖剪機對(dui)于(yu)電(dian)(dian)流(liu)的(de)(de)要求(qiu)是很高的(de)(de),對(dui)于(yu)由電(dian)(dian)流(liu)互感器計算變(bian)比(bi)與實際變(bian)比(bi)不(bu)同而產生的(de)(de)不(bu)平衡(heng)電(dian)(dian)流(liu)可采用2種方法(fa)來克服:

　　一(yi)是采用自(zi)耦(ou)變(bian)流(liu)(liu)器進行(xing)補償(chang).通常在(zai)變(bian)壓(ya)器一(yi)側電(dian)流(liu)(liu)互感器裝設(she)自(zi)耦(ou)變(bian)流(liu)(liu)器,將(jiang)LH輸(shu)(shu)出端接到變(bian)流(liu)(liu)器的(de)輸(shu)(shu)入端,當改變(bian)自(zi)耦(ou)變(bian)流(liu)(liu)器的(de)變(bian)比時,可以使(shi)變(bian)流(liu)(liu)器的(de)輸(shu)(shu)出電(dian)流(liu)(liu)等于未裝設(she)變(bian)流(liu)(liu)器的(de)LH的(de)二(er)次電(dian)流(liu)(liu),從而使(shi)流(liu)(liu)入差動繼電(dian)器的(de)電(dian)流(liu)(liu)為(wei)零或接近為(wei)零.

　　二(er)是利用中(zhong)(zhong)間變(bian)(bian)流(liu)(liu)器(qi)的(de)(de)(de)(de)平(ping)衡(heng)(heng)線(xian)圈(quan)(quan)進(jin)行磁(ci)補償.通常在中(zhong)(zhong)間變(bian)(bian)流(liu)(liu)器(qi)的(de)(de)(de)(de)鐵心上(shang)繞(rao)有(you)主線(xian)圈(quan)(quan)即差(cha)(cha)動(dong)(dong)線(xian)圈(quan)(quan),接(jie)入(ru)(ru)差(cha)(cha)動(dong)(dong)電(dian)(dian)流(liu)(liu),另外(wai)(wai)還繞(rao)一個(ge)平(ping)衡(heng)(heng)線(xian)圈(quan)(quan)和(he)一個(ge)二(er)次(ci)線(xian)圈(quan)(quan),接(jie)入(ru)(ru)二(er)次(ci)電(dian)(dian)流(liu)(liu)較小的(de)(de)(de)(de)一側.適當選擇平(ping)衡(heng)(heng)線(xian)圈(quan)(quan)的(de)(de)(de)(de)匝數,使平(ping)衡(heng)(heng)線(xian)圈(quan)(quan)產(chan)生的(de)(de)(de)(de)磁(ci)勢能完全抵消差(cha)(cha)動(dong)(dong)線(xian)圈(quan)(quan)產(chan)生的(de)(de)(de)(de)磁(ci)勢,則(ze)在二(er)次(ci)線(xian)圈(quan)(quan)里就(jiu)不會感(gan)應電(dian)(dian)勢,因而(er)(er)差(cha)(cha)動(dong)(dong)繼(ji)電(dian)(dian)器(qi)中(zhong)(zhong)也沒有(you)電(dian)(dian)流(liu)(liu)流(liu)(liu)過.采(cai)用具(ju)有(you)磁(ci)力(li)制(zhi)動(dong)(dong)特性的(de)(de)(de)(de)差(cha)(cha)動(dong)(dong)繼(ji)電(dian)(dian)器(qi).變(bian)(bian)壓(ya)器(qi)的(de)(de)(de)(de)差(cha)(cha)動(dong)(dong)繼(ji)電(dian)(dian)器(qi)是在速(su)飽和(he)變(bian)(bian)流(liu)(liu)器(qi)的(de)(de)(de)(de)基礎上(shang),增(zeng)加一組制(zhi)動(dong)(dong)線(xian)圈(quan)(quan),利用外(wai)(wai)部故障時的(de)(de)(de)(de)短路(lu)電(dian)(dian)流(liu)(liu)來實現制(zhi)動(dong)(dong),使繼(ji)電(dian)(dian)器(qi)的(de)(de)(de)(de)起(qi)動(dong)(dong)電(dian)(dian)流(liu)(liu)隨制(zhi)動(dong)(dong)電(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)增(zeng)加而(er)(er)增(zeng)加,它能可靠地躲(duo)開變(bian)(bian)壓(ya)器(qi)外(wai)(wai)部短路(lu)時的(de)(de)(de)(de)不平(ping)衡(heng)(heng)電(dian)(dian)流(liu)(liu),并(bing)提(ti)高(gao)變(bian)(bian)壓(ya)器(qi)內部故障時的(de)(de)(de)(de)靈(ling)敏度.

　　因此(ci),繼(ji)電(dian)(dian)器(qi)的啟動(dong)電(dian)(dian)流隨著(zhu)制動(dong)電(dian)(dian)流的增大(da)(da)(da)而增大(da)(da)(da).通過正確的定值整(zheng)定,可以使繼(ji)電(dian)(dian)器(qi)的實際啟動(dong)電(dian)(dian)流不論在任何大(da)(da)(da)小(xiao)的外部短路電(dian)(dian)流的作用下(xia)均大(da)(da)(da)于(yu)相(xiang)應的不平衡電(dian)(dian)流,變壓(ya)器(qi)縱差保護能可靠躲過變壓(ya)器(qi)外部短路時的不平衡電(dian)(dian)流.

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