針(zhen)對(dui)不間(jian)(jian)(jian)斷(duan)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)中(zhong)設(she)置(zhi)隔離(li)(li)干(gan)(gan)式(shi)變(bian)壓(ya)器的問(wen)(wen)題，根據(ju)現行家標準，論述了根據(ju)不間(jian)(jian)(jian)斷(duan)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)輸(shu)(shu)出中(zhong)性(xing)線接地規定設(she)置(zhi)隔離(li)(li)干(gan)(gan)式(shi)變(bian)壓(ya)器的必要(yao)性(xing)和可解決的問(wen)(wen)題，以及(ji)采用隔離(li)(li)干(gan)(gan)式(shi)變(bian)壓(ya)器限(xian)制電(dian)(dian)(dian)源(yuan)(yuan)(yuan)中(zhong)性(xing)線對(dui)地電(dian)(dian)(dian)壓(ya)、設(she)置(zhi)隔離(li)(li)干(gan)(gan)式(shi)變(bian)壓(ya)器抑制諧波(bo)等技(ji)術措施， 提高不間(jian)(jian)(jian)斷(duan)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)系統的抗干(gan)(gan)擾能力，并設(she)置(zhi)一個(ge)隔離(li)(li)干(gan)(gan)式(shi)變(bian)壓(ya)器來(lai)平衡不間(jian)(jian)(jian)斷(duan)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)旁路的旁路電(dian)(dian)(dian)源(yuan)(yuan)(yuan)與三(san)相電(dian)(dian)(dian)源(yuan)(yuan)(yuan)輸(shu)(shu)入/三(san)相輸(shu)(shu)出的負載，并對(dui)如何設(she)置(zhi)及(ji)原理提出個(ge)人看法(fa)，供業內(nei)人士參考1問(wen)(wen)題的由來(lai)

隨(sui)著電(dian)(dian)(dian)力電(dian)(dian)(dian)子晶體管(guan)(guan)技術的(de)(de)發展(zhan)和(he)(he)器(qi)件(jian)性能的(de)(de)提高(gao)，不(bu)間斷電(dian)(dian)(dian)源(yuan)已經從使(shi)用硅整流(liu)(liu)二極(ji)管(guan)(guan)和(he)(he)晶閘管(guan)(guan)的(de)(de)傳統電(dian)(dian)(dian)力器(qi)件(jian)發展(zhan)到使(shi)用IGBT和(he)(he)其他大功(gong)(gong)率晶體管(guan)(guan)的(de)(de)逆(ni)(ni)變(bian)(bian)器(qi)。近年來，其整流(liu)(liu)器(qi)和(he)(he)逆(ni)(ni)變(bian)(bian)器(qi)采用了(le)IGBT大功(gong)(gong)率晶體管(guan)(guan)器(qi)件(jian)。由(you)于DC/DC DC電(dian)(dian)(dian)壓(ya)變(bian)(bian)換器(qi)在不(bu)間斷電(dian)(dian)(dian)源(yuan)中的(de)(de)應用，不(bu)間斷電(dian)(dian)(dian)源(yuan)逆(ni)(ni)變(bian)(bian)器(qi)的(de)(de)輸(shu)入(ru)DC電(dian)(dian)(dian)壓(ya)能夠滿足交流(liu)(liu)輸(shu)出電(dian)(dian)(dian)壓(ya)的(de)(de)要(yao)求，可以替代整流(liu)(liu)干(gan)(gan)式變(bian)(bian)壓(ya)器(qi)和(he)(he)逆(ni)(ni)變(bian)(bian)干(gan)(gan)式變(bian)(bian)壓(ya)器(qi)調節(jie)不(bu)間斷電(dian)(dian)(dian)源(yuan)交流(liu)(liu)輸(shu)出電(dian)(dian)(dian)壓(ya)的(de)(de)方法。所以很多UPS供應商都(dou)把(ba)輸(shu)入(ru)干(gan)(gan)式變(bian)(bian)壓(ya)器(qi)和(he)(he)輸(shu)出干(gan)(gan)式變(bian)(bian)壓(ya)器(qi)列為選項，并不(bu)是(shi)標準(zhun)配置。鑒(jian)于UPS是(shi)否配備干(gan)(gan)式變(bian)(bian)壓(ya)器(qi)與(yu)運行(xing)投資、占地、負荷和(he)(he)損耗等有關。需要(yao)明確設置隔離干(gan)(gan)式變(bian)(bian)壓(ya)器(qi)的(de)(de)意圖，并根據需要(yao)設置相應的(de)(de)隔離干(gan)(gan)式變(bian)(bian)壓(ya)器(qi)。

2三相輸入三相輸出(chu)的(de)UPS輸出(chu)零線需要功能接地

 三(san)相電(dian)源輸入(ru)/三(san)相輸出(chu)的UPS一般容量較大，但當其(qi)供電(dian)對象為(wei)計算(suan)機、DCS、BAS、安防、電(dian)信、控制電(dian)源等系(xi)統(tong)時(shi)(shi)，都是(shi)(shi)單(dan)相負(fu)載(zai)(zai)(zai)。按照目前(qian)的家標準，UPS的三(san)相負(fu)載(zai)(zai)(zai)應該是(shi)(shi)均(jun)衡分布的，這實際上(shang)很難(nan)實現，三(san)相不(bu)(bu)(bu)平(ping)(ping)衡是(shi)(shi)不(bu)(bu)(bu)可避免的。由于三(san)相負(fu)載(zai)(zai)(zai)不(bu)(bu)(bu)平(ping)(ping)衡，負(fu)載(zai)(zai)(zai)不(bu)(bu)(bu)可能一直(zhi)恒定，同時(shi)(shi)負(fu)載(zai)(zai)(zai)運(yun)(yun)行方式不(bu)(bu)(bu)同，UPS電(dian)源中性(xing)點漂(piao)移。雖然有些UPS允(yun)許三(san)相負(fu)載(zai)(zai)(zai)100%不(bu)(bu)(bu)平(ping)(ping)衡運(yun)(yun)行，即一相負(fu)載(zai)(zai)(zai)為(wei)0，其(qi)他(ta)相負(fu)載(zai)(zai)(zai)為(wei)100%時(shi)(shi)正常運(yun)(yun)行，這是(shi)(shi)UPS設備本身的功能，但UPS容量的選擇并不(bu)(bu)(bu)是(shi)(shi)這樣，而(er)是(shi)(shi)UPS較大負(fu)載(zai)(zai)(zai)相的值乘以(yi)3作為(wei)其(qi)所需容量。

資料(liao)來源：Xaar電(dian)能(neng)質量