功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)是(shi)(shi)單位時間內做功(gong)(gong)(gong)(gong)的(de)大(da)小或能(neng)量轉換的(de)大(da)小，視在(zai)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)是(shi)(shi)指發(fa)電(dian)機發(fa)出的(de)總功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)，其(qi)中可以分為有功(gong)(gong)(gong)(gong)部分和(he)無(wu)功(gong)(gong)(gong)(gong)部分。有功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)是(shi)(shi)保持用電(dian)設備(bei)正常運行所需的(de)電(dian)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)，也就(jiu)是(shi)(shi)將電(dian)能(neng)轉換為其(qi)他形式能(neng)量(機械能(neng)、光能(neng)、熱能(neng))的(de)電(dian)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)。

變(bian)壓(ya)器無功補償(chang)設計時(shi)需要注意的事項

QNSVG適(shi)用于負荷快速變化能夠引起無功沖(chong)擊的場(chang)合，如使用大功率水(shui)(shui)泵、龍門吊(diao)、斜井提升機、中頻爐、電焊機等設備的地(di)方。具體到行(xing)業(ye)(ye)(ye)有：電氣(qi)化鐵(tie)道及城市(shi)軌道交(jiao)通行(xing)業(ye)(ye)(ye)、石化和天(tian)然氣(qi)行(xing)業(ye)(ye)(ye)、電力行(xing)業(ye)(ye)(ye)、鋼鐵(tie)行(xing)業(ye)(ye)(ye)、冶金(jin)行(xing)業(ye)(ye)(ye)、水(shui)(shui)處理行(xing)業(ye)(ye)(ye)、水(shui)(shui)泥行(xing)業(ye)(ye)(ye)、汽車行(xing)業(ye)(ye)(ye)、煙草業(ye)(ye)(ye)、造紙業(ye)(ye)(ye)、過程控(kong)制工業(ye)(ye)(ye)、造船業(ye)(ye)(ye)、精密制造業(ye)(ye)(ye)。

以造紙(zhi)(zhi)廠的(de)紙(zhi)(zhi)機(ji)(ji)為例(li)。由于紙(zhi)(zhi)卷(juan)(juan)半徑開始(shi)小，越往后(hou)就越大。卷(juan)(juan)紙(zhi)(zhi)的(de)線速(su)度必(bi)須是固定的(de)，太快會(hui)將紙(zhi)(zhi)扯斷(duan)，太慢又會(hui)堆(dui)積。因此紙(zhi)(zhi)機(ji)(ji)的(de)大功(gong)率電(dian)機(ji)(ji)必(bi)定要采(cai)用(yong)變(bian)頻器(qi)按恒轉(zhuan)矩來調速(su)。由于采(cai)用(yong)了變(bian)頻器(qi)，諧波(bo)(bo)也(ye)就出(chu)現了。存在(zai)大量電(dian)阻爐(lu)的(de)場合(he)，配(pei)電(dian)網(wang)中諧波(bo)(bo)的(de)次數(shu)較高，且存在(zai)分數(shu)次諧波(bo)(bo)。這時，一定要用(yong)電(dian)力儀表測量諧波(bo)(bo)次數(shu)，以便得到合(he)適的(de)補償。