分享10KV高壓電容柜的自動化控制系統原理
10KV高壓電容柜稱為10KV高壓無功補償裝置,是用(yong)于提高設備(bei)的(de)供(gong)電(dian)(dian)質量和運行的(de)可靠性,減少電(dian)(dian)網(wang)線路(lu)(lu)損耗。迅速(su)地跟蹤(zong)電(dian)(dian)網(wang)或負荷(he)的(de)波動,通過各回路(lu)(lu)的(de)自(zi)動投切,對變化的(de)無(wu)功功率(lv)進行自(zi)動補(bu)償(chang),提高系統(tong)功率(lv)因數,補(bu)償(chang)后功率(lv)因數在0.95以上。
一、基本原理
其原理(li)把具有(you)容(rong)性(xing)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)負荷的裝(zhuang)置與感(gan)性(xing)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)負荷并聯在(zai)同一線路(lu),當容(rong)性(xing)負荷釋放能(neng)量(liang)(liang)是(shi),感(gan)性(xing)負荷吸(xi)(xi)收(shou)能(neng)量(liang)(liang)。而感(gan)性(xing)負荷釋放時,正(zheng)好(hao)被容(rong)性(xing)負荷吸(xi)(xi)收(shou)。根據系統反饋的參數(shu),自動(dong)計(ji)算出所需(xu)無功(gong)(gong)(gong)(gong)(gong)大小,對各MSC支路(lu)進行自動(dong)投切(qie),從而實(shi)現系統所需(xu)無功(gong)(gong)(gong)(gong)(gong)的自動(dong)調(diao)節,該控制器可(ke)根據用戶需(xu)要可(ke)按(an)無功(gong)(gong)(gong)(gong)(gong)、電壓或(huo)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)因數(shu)進行自動(dong)控制。
二、PLC控制系統
高壓電容柜采用PLC全自動控制系統,通過(guo)PLC實現自動分步投切并(bing)聯在(zai)配電(dian)變壓器母(mu)線的電(dian)容器組,提(ti)供(gong)相(xiang)應的容性無功功率。
三、電容器
電容(rong)器(qi)應(ying)具有(you)不浸(jin)油、不滲漏、不燃燒、不污染(ran)環境以及壽命(ming)長、損耗(hao)低等先進指標,同時(shi)(shi)應(ying)與(yu)配套設備的技術參數相適應(ying)并滿(man)足電壓波動(dong)的允許條件(jian)(jian)。電容(rong)器(qi)被永久擊穿(chuan)時(shi)(shi)僅故(gu)障元件(jian)(jian)退出運(yun)行,其他元件(jian)(jian)仍可正(zheng)常運(yun)行。自動(dong)投切(qie)電容(rong)器(qi)的裝置(zhi)使功率因數保持(chi)在0.95以上,同時(shi)(shi)分組切(qie)投時(shi)(shi),不應(ying)產生諧振。電容(rong)器(qi)前串(chuan)接6%電抗器(qi)。
10KV高壓電容(rong)柜(ju)采用柜(ju)式結構,進線電纜由柜(ju)底部(bu)引入,并具有“五防”措施保(bao)護(hu)。根(gen)據補(bu)(bu)償原理不同,可以分(fen)為集中補(bu)(bu)償裝(zhuang)置(zhi)和就(jiu)地補(bu)(bu)償裝(zhuang)置(zhi)。無功(gong)集中補(bu)(bu)償是通(tong)過(guo)電容(rong)對整(zheng)個電網的補(bu)(bu)償,從而(er)維持整(zheng)個電網的平衡。無功(gong)就(jiu)地補(bu)(bu)償是通(tong)過(guo)對電機的補(bu)(bu)償,從而(er)降低線路損耗(hao)。
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