一、電力電容器接線方式有哪幾種
1、星形接線方式
在電(dian)力系統中(zhong)(zhong),星形接線(xian)(xian)可分為帶中(zhong)(zhong)性(xing)線(xian)(xian)和不(bu)帶中(zhong)(zhong)性(xing)線(xian)(xian)兩種(zhong)情(qing)況。其中(zhong)(zhong)帶中(zhong)(zhong)性(xing)線(xian)(xian)方式(shi)的(de)優勢(shi)在于可以(yi)進行分相投(tou)切,從而補償電(dian)網負(fu)荷的(de)三相不(bu)平衡。對(dui)于不(bu)帶中(zhong)(zhong)性(xing)線(xian)(xian)方式(shi)來(lai)說,其需(xu)要兩相電(dian)容才能形成回路(lu)(lu)。和星形帶中(zhong)(zhong)性(xing)線(xian)(xian)方式(shi)相同的(de)是,它們的(de)三相基波電(dian)壓(ya)對(dui)稱,所以(yi)三相基波電(dian)流合成值為零;而3次(ci)諧(xie)波電(dian)流則由線(xian)(xian)電(dian)壓(ya)決定,三相電(dian)壓(ya)的(de)3次(ci)諧(xie)波大小相等,方向(xiang)相同,在線(xian)(xian)電(dian)壓(ya)中(zhong)(zhong)相互(hu)抵消(xiao),因此電(dian)容支(zhi)路(lu)(lu)中(zhong)(zhong)沒有(you)3次(ci)諧(xie)波電(dian)流。
2、三角形接線
在電力(li)系統中,三(san)角(jiao)形(xing)(xing)接(jie)法按照星形(xing)(xing)三(san)角(jiao)形(xing)(xing)變換原理(li),可(ke)以轉化為(wei)星形(xing)(xing)接(jie)線。當電力(li)系統中存在三(san)相(xiang)不(bu)平衡的(de)負載(zai)時,可(ke)令各相(xiang)電容(rong)值不(bu)等(deng),根據各相(xiang)負荷進行分相(xiang)補償。在電力(li)補償電容(rong)器總無功(gong)容(rong)量(liang)相(xiang)等(deng)的(de)情況下,三(san)角(jiao)形(xing)(xing)接(jie)線和(he)星形(xing)(xing)無中性(xing)(xing)線方(fang)式度外電路表(biao)示的(de)特性(xing)(xing)相(xiang)同。在實際進行無功(gong)補償時,企業采用(yong)三(san)角(jiao)形(xing)(xing)接(jie)線方(fang)式更多。
星形(xing)接(jie)線和三角(jiao)形(xing)接(jie)線,是電力補償電容(rong)器常見的接(jie)線方式。目前企業常用的接(jie)線方式是三角(jiao)形(xing)接(jie)線,因為它可以實現分相(xiang)(xiang)補償,解(jie)決(jue)三相(xiang)(xiang)不(bu)平衡的問題。
二、電力電容器接線柱怎么接
電(dian)(dian)力(li)電(dian)(dian)容(rong)器(qi)(qi)接線柱(zhu)一般(ban)有三個(ge),分(fen)別標(biao)注為U、V、W,分(fen)別對應電(dian)(dian)容(rong)器(qi)(qi)內(nei)(nei)(nei)部(bu)(bu)(bu)的(de)(de)三個(ge)電(dian)(dian)極。正確的(de)(de)接法是U接在電(dian)(dian)容(rong)器(qi)(qi)內(nei)(nei)(nei)部(bu)(bu)(bu)的(de)(de)U極,V接在內(nei)(nei)(nei)部(bu)(bu)(bu)的(de)(de)V極,W接在內(nei)(nei)(nei)部(bu)(bu)(bu)的(de)(de)W極上。同時,還需要(yao)接地(di)線連接電(dian)(dian)容(rong)器(qi)(qi)本體和接線盒(he)之(zhi)間的(de)(de)金(jin)屬橋。
三、電力電容器組的接線原則
1、必須確保電容能充分放電
電力電容器組停運檢修時必須保證各個電容器完全放電,才可以最大程度的避免觸電事故的發生。而保證電(dian)(dian)(dian)(dian)容(rong)充分放(fang)電(dian)(dian)(dian)(dian)除了(le)需(xu)要電(dian)(dian)(dian)(dian)容(rong)本身設計(ji)有一定的放(fang)電(dian)(dian)(dian)(dian)裝置,使退出運行后的電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)容(rong)殘余電(dian)(dian)(dian)(dian)壓(ya)不超過(guo)65V,還需(xu)要工作人員檢修(xiu)前用(yong)接(jie)地線(xian)再(zai)次(ci)放(fang)電(dian)(dian)(dian)(dian)。此外,當電(dian)力(li)電(dian)容器組超過1000V時可以搭配電(dian)壓互感器使用,通過一次繞組進行再次放電(dian)。
2、可與放電裝置直接相連
電力電容器組可以與放電設備設置直接自動接通的接點,中間不用加裝任何開關或熔斷器設備。因為若電(dian)容(rong)放電(dian)回路安裝有(you)熔斷(duan)(duan)器(qi)(qi)等器(qi)(qi)件,當熔斷(duan)(duan)器(qi)(qi)出現熔斷(duan)(duan)故障需要(yao)斷(duan)(duan)開時會對相關操作人員造成安全危害。
3、電力電容需接地
當電(dian)(dian)容組接入(ru)電(dian)(dian)網(wang)(wang)時,每臺電(dian)(dian)容都(dou)應對地絕(jue)緣且絕(jue)緣水平要高于系統(tong)額定(ding)(ding)電(dian)(dian)壓(ya);當電(dian)(dian)容額定(ding)(ding)電(dian)(dian)壓(ya)與電(dian)(dian)網(wang)(wang)標稱(cheng)電(dian)(dian)壓(ya)相同時則需(xu)將電(dian)(dian)容外殼接地,若額定(ding)(ding)電(dian)(dian)壓(ya)低于供電(dian)(dian)電(dian)(dian)網(wang)(wang)標準電(dian)(dian)壓(ya)則需(xu)加裝絕(jue)緣支架(jia)。
4、電容器組可設單獨的保護裝置
如果想單獨提高某一用電設備的功率因數可以為相關電力電容器組設置單(dan)獨的(de)控制及保護裝置。