插(cha)(cha)件氧化鋅壓(ya)敏(min)電(dian)(dian)(dian)阻(zu)選型第一步所需要(yao)確認的(de)(de)是(shi)MOV的(de)(de)標稱電(dian)(dian)(dian)壓(ya)，MOV的(de)(de)標稱電(dian)(dian)(dian)壓(ya)指(zhi)的(de)(de)是(shi)在規定溫度和直(zhi)流電(dian)(dian)(dian)流下，壓(ya)敏(min)電(dian)(dian)(dian)阻(zu)兩端(duan)的(de)(de)電(dian)(dian)(dian)壓(ya)值。東沃電(dian)(dian)(dian)子（DOWOSEMI）推出的(de)(de)插(cha)(cha)件壓(ya)敏(min)電(dian)(dian)(dian)阻(zu)MOV標稱電(dian)(dian)(dian)壓(ya)范圍(wei)為18V-1800V，電(dian)(dian)(dian)壓(ya)精度通(tong)常在±10%，能夠滿足低壓(ya)到(dao)高壓(ya)的(de)(de)應(ying)用需求。那么，在實際應(ying)用中，如何(he)確認壓(ya)敏(min)電(dian)(dian)(dian)阻(zu)的(de)(de)標稱電(dian)(dian)(dian)壓(ya)呢？MOV標稱電(dian)(dian)(dian)壓(ya)應(ying)該如何(he)選取(qu)？

一般來(lai)講，插件(jian)氧化鋅(xin)壓(ya)敏電(dian)(dian)(dian)(dian)(dian)阻(zu)MOV常常與被保(bao)護(hu)器(qi)件(jian)或(huo)裝(zhuang)置并聯使用，在正(zheng)常情況(kuang)下，其兩(liang)端的(de)(de)直(zhi)流或(huo)交流電(dian)(dian)(dian)(dian)(dian)壓(ya)應(ying)(ying)低(di)于(yu)標(biao)稱(cheng)電(dian)(dian)(dian)(dian)(dian)壓(ya)，即使在電(dian)(dian)(dian)(dian)(dian)源(yuan)波動(dong)情況(kuang)最壞時，也(ye)不應(ying)(ying)高于(yu)額定值中選(xuan)擇的(de)(de)最大(da)(da)連續工(gong)作電(dian)(dian)(dian)(dian)(dian)壓(ya)，該最大(da)(da)連續工(gong)作電(dian)(dian)(dian)(dian)(dian)壓(ya)值所對應(ying)(ying)的(de)(de)標(biao)稱(cheng)電(dian)(dian)(dian)(dian)(dian)壓(ya)值即為選(xuan)用值。對于(yu)過壓(ya)保(bao)護(hu)方面的(de)(de)應(ying)(ying)用，壓(ya)敏電(dian)(dian)(dian)(dian)(dian)阻(zu)標(biao)稱(cheng)電(dian)(dian)(dian)(dian)(dian)壓(ya)值應(ying)(ying)大(da)(da)于(yu)實際電(dian)(dian)(dian)(dian)(dian)路的(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)值，標(biao)稱(cheng)電(dian)(dian)(dian)(dian)(dian)壓(ya)計(ji)算公式如下圖所示：

另外，插件(jian)氧化鋅壓敏電(dian)阻MOV選用時(shi)還必須注意：

1）必須(xu)保證(zheng)在電(dian)壓波動最大(da)時，連(lian)續工作電(dian)壓也不會超過(guo)最大(da)允許值，否(fou)則將縮短壓敏電(dian)阻的使(shi)用壽命；

2）在電(dian)源線與(yu)(yu)大地(di)間使(shi)用(yong)壓(ya)(ya)(ya)敏(min)電(dian)阻(zu)時，有(you)時由于接地(di)不良而使(shi)線與(yu)(yu)地(di)之間電(dian)壓(ya)(ya)(ya)上(shang)升，所(suo)以通常采(cai)用(yong)比線與(yu)(yu)線間使(shi)用(yong)場(chang)合更高(gao)標稱(cheng)電(dian)壓(ya)(ya)(ya)的壓(ya)(ya)(ya)敏(min)電(dian)阻(zu)器。

確認好壓敏(min)電(dian)(dian)(dian)阻(zu)MOV標稱電(dian)(dian)(dian)壓后，緊接(jie)著還需要(yao)確認MOV的(de)(de)浪涌電(dian)(dian)(dian)流，其值要(yao)大(da)于產品的(de)(de)最大(da)通流量；壓敏(min)電(dian)(dian)(dian)阻(zu)的(de)(de)鉗位電(dian)(dian)(dian)壓要(yao)小于被保護(hu)設備承受的(de)(de)最大(da)電(dian)(dian)(dian)壓；如果是用在高頻傳輸信號的(de)(de)線路中，還要(yao)注意結電(dian)(dian)(dian)容的(de)(de)選(xuan)取……

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