主(zhu)要(yao)設備選型 ：醫(yi)院(yuan)內(nei)的(de)(de)三(san)相(xiang)大型醫(yi)用儀器，使用時一般不與患(huan)者直接(jie)接(jie)觸(chu)，可采用裝設快速、高(gao)靈敏(min)度漏電(dian)斷路(lu)器的(de)(de)直接(jie)接(jie)地(di)(di)方(fang)式。但三(san)相(xiang)隔(ge)離變壓器要(yao)慎(shen)用，主(zhu)要(yao)原因在于(yu)三(san)相(xiang)隔(ge)離系統(tong)(IT系統(tong))中如出現(xian)單相(xiang)接(jie)地(di)(di)故障，非故障相(xiang)的(de)(de)對(dui)地(di)(di)電(dian)壓將升高(gao)到對(dui)地(di)(di)額定電(dian)壓的(de)(de)倍，因而具(ju)有對(dui)地(di)(di)故障擴大的(de)(de)危險，所以應盡量采用單相(xiang)隔(ge)離電(dian)源(yuan)系統(tong)。

IT系統(tong)(tong)因(yin)(yin)降低了觸(chu)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)壓和電(dian)(dian)(dian)(dian)(dian)(dian)網對(dui)(dui)(dui)(dui)地(di)漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)（有效(xiao)控制對(dui)(dui)(dui)(dui)心(xin)臟的(de)(de)(de)(de)(de)(de)直(zhi)接漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)），故人(ren)身(shen)觸(chu)電(dian)(dian)(dian)(dian)(dian)(dian)危險被降到小程度（避免微(wei)事故）。IT系統(tong)(tong)內部一(yi)旦(dan)出現個對(dui)(dui)(dui)(dui)地(di)漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)故障(zhang)，不(bu)(bu)(bu)會(hui)導致(zhi)系統(tong)(tong)斷路器(qi)或熔斷器(qi)動作，因(yin)(yin)而保證了電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)供電(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)(de)可靠(kao)性（負載(zai)出現漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)(de)情況下不(bu)(bu)(bu)斷電(dian)(dian)(dian)(dian)(dian)(dian)）。隨(sui)著電(dian)(dian)(dian)(dian)(dian)(dian)子(zi)醫院設備(bei)在醫院領域(yu)的(de)(de)(de)(de)(de)(de)廣泛(fan)應(ying)用(yong)，漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)對(dui)(dui)(dui)(dui)患(huan)(huan)(huan)者構成的(de)(de)(de)(de)(de)(de)威脅也(ye)越(yue)來越(yue)大，尤其是(shi)那(nei)些(xie)(xie)生命(ming)攸關(guan)的(de)(de)(de)(de)(de)(de)場(chang)所，患(huan)(huan)(huan)者在手(shou)術中或麻藥狀態下，it系統(tong)(tong)批發，各種傳感器(qi)直(zhi)接插入人(ren)體內，微(wei)小的(de)(de)(de)(de)(de)(de)漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)都(dou)有可能導致(zhi)患(huan)(huan)(huan)者觸(chu)電(dian)(dian)(dian)(dian)(dian)(dian)身(shen)亡。另外(wai)有些(xie)(xie)醫院設備(bei)用(yong)于(yu)維(wei)持患(huan)(huan)(huan)者的(de)(de)(de)(de)(de)(de)生命(ming)，一(yi)旦(dan)設備(bei)停電(dian)(dian)(dian)(dian)(dian)(dian)，也(ye)會(hui)對(dui)(dui)(dui)(dui)患(huan)(huan)(huan)者的(de)(de)(de)(de)(de)(de)生命(ming)構成威脅。因(yin)(yin)此，對(dui)(dui)(dui)(dui)于(yu)醫院這一(yi)特殊場(chang)所的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)氣設計，應(ying)嚴格(ge)(ge)按(an)照和規范要求，采(cai)用(yong)IT系統(tong)(tong)供電(dian)(dian)(dian)(dian)(dian)(dian)。一(yi)般用(yong)于(yu)不(bu)(bu)(bu)允許停電(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)(de)場(chang)所，或者是(shi)要求嚴格(ge)(ge)地(di)連(lian)續供電(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)(de)地(di)方(fang)，醫院的(de)(de)(de)(de)(de)(de)手(shou)術室(shi)和ICU室(shi)等二類場(chang)所要采(cai)用(yong)IT系統(tong)(tong)。采(cai)用(yong)醫用(yong)隔(ge)離電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(IT)系統(tong)(tong)，即(ji)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)中性點(dian)不(bu)(bu)(bu)接地(di)，一(yi)旦(dan)設備(bei)漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)，單(dan)相對(dui)(dui)(dui)(dui)地(di)漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)很小，不(bu)(bu)(bu)會(hui)破(po)壞電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)壓的(de)(de)(de)(de)(de)(de)平衡，所以比(bi)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)中性點(dian)接地(di)的(de)(de)(de)(de)(de)(de)系統(tong)(tong)安(an)全、可靠(kao)。

醫(yi)(yi)用(yong)(yong)(yong)(yong)IT系(xi)(xi)(xi)統(tong)(tong)(tong)在(zai)醫(yi)(yi)用(yong)(yong)(yong)(yong)場所(suo)的應用(yong)(yong)(yong)(yong)醫(yi)(yi)用(yong)(yong)(yong)(yong)IT系(xi)(xi)(xi)統(tong)(tong)(tong)是(shi)IT系(xi)(xi)(xi)統(tong)(tong)(tong)應用(yong)(yong)(yong)(yong)的一(yi)個典型實(shi)例。醫(yi)(yi)院因(yin)其職能的特殊(shu)性，對(dui)其配(pei)(pei)電方式有(you)特殊(shu)的要(yao)求。如手術室、監護室等，都(dou)需要(yao)采用(yong)(yong)(yong)(yong)IT系(xi)(xi)(xi)統(tong)(tong)(tong)，以提供一(yi)個安全、可靠、連續的配(pei)(pei)電系(xi)(xi)(xi)統(tong)(tong)(tong)。醫(yi)(yi)用(yong)(yong)(yong)(yong)IT系(xi)(xi)(xi)統(tong)(tong)(tong)在(zai)醫(yi)(yi)用(yong)(yong)(yong)(yong)場所(suo)應用(yong)(yong)(yong)(yong)時的注意事項由于(yu)醫(yi)(yi)用(yong)(yong)(yong)(yong)場所(suo)具有(you)其特殊(shu)性，因(yin)此(ci)在(zai)進行時候醫(yi)(yi)用(yong)(yong)(yong)(yong)IT系(xi)(xi)(xi)統(tong)(tong)(tong)設(she)計時應特別注意以下幾點(dian)：散熱設(she)計，工業電源模塊(kuai)約(yue)15%的損壞(huai)是(shi)由于(yu)散熱不良(liang)引起(qi)的。