1756-L61RMEN1
1756-L61RMEN1
隨著UPS電源被廣泛應(yīng)用于各行各業(yè),用戶安裝的某些負(fù)載(例如HP小型機(jī)、IBM服務(wù)器等),會(huì)對(duì)UPS電源輸出零地電壓有較高的要求,一般情況下要求<1V。
但在實(shí)際的工程安裝和開(kāi)機(jī)調(diào)試時(shí)發(fā)現(xiàn),UPS電源沒(méi)開(kāi)機(jī)時(shí)測(cè)量輸出零地電壓還滿足要求,開(kāi)機(jī)上電后測(cè)量UPS電源的輸出零地電壓會(huì)上升,有可能出現(xiàn)零地電壓超出了要求的范圍。導(dǎo)致設(shè)備無(wú)法正常工作甚至設(shè)備損壞,其原因大致有以下兩點(diǎn):
1)用戶本身的配電系統(tǒng)達(dá)不到要求,當(dāng)零線排容量偏小時(shí),零線上的電流會(huì)造成零線相對(duì)地線有一定的電壓差,這樣,在UPS的輸入處, 零地電壓就會(huì)升高而達(dá)不到設(shè)備要求;
2)UPS電源是開(kāi)關(guān)電源,其輸入和輸出端都加裝了EMI抑制電路,由于電感和電容的存在,會(huì)造?輸出零線與輸入零線之間存在電壓差,因而造 成了輸出零線與地線之間的電壓差。
☆公司名稱(chēng):廈門(mén)泰尼電氣有限公司
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為有效地降低輸出的零地電壓,保證負(fù)載可以正常上電開(kāi)機(jī),通常的做法是采用加裝隔離變壓器的辦法,來(lái)隔離輸入和輸出之間的電氣連接, 在變壓器副邊零地短接,從而達(dá)到降低零地電壓的目的。對(duì)于中小功率的UPS,一般采用在其輸出端加裝輸出隔離變壓器;對(duì)于三進(jìn)三出的大功率UPS,一般采用在其旁路輸入加裝旁路隔離變壓器。