猫咪社区免费资源在线观看_日日摸夜夜添无码无码AV_人人妻人人澡人人爽欧美一区双_国语自产精品视频在线看

貼片保險絲額定電壓和電流如何選擇：貼(tie)片保(bao)險(xian)(xian)絲(si)的(de)(de)(de)額(e)定(ding)電(dian)壓(ya)(ya)取決于(yu)(yu)流過它(ta)的(de)(de)(de)電(dian)流，與電(dian)路的(de)(de)(de)工(gong)作電(dian)壓(ya)(ya)無關。從安全(quan)使用的(de)(de)(de)角度提出了貼(tie)片保(bao)險(xian)(xian)絲(si)的(de)(de)(de)額(e)定(ding)電(dian)壓(ya)(ya)，即貼(tie)片保(bao)險(xian)(xian)絲(si)處于(yu)(yu)安全(quan)工(gong)作狀態時電(dian)路的(de)(de)(de)最高工(gong)作電(dian)壓(ya)(ya)。這(zhe)意味著(zhu)保(bao)險(xian)(xian)絲(si)只能放(fang)置在工(gong)作電(dian)壓(ya)(ya)小于(yu)(yu)或等(deng)于(yu)(yu)保(bao)險(xian)(xian)絲(si)額(e)定(ding)電(dian)壓(ya)(ya)的(de)(de)(de)電(dian)路中。只有這(zhe)樣，保(bao)險(xian)(xian)絲(si)才(cai)能安全(quan)有效(xiao)地工(gong)作。

貼(tie)片(pian)保(bao)(bao)險(xian)(xian)(xian)絲(si)兩(liang)端的電(dian)(dian)壓降(jiang)很小，遠小于貼(tie)片(pian)保(bao)(bao)險(xian)(xian)(xian)絲(si)的額(e)定(ding)(ding)電(dian)(dian)壓。因此，正(zheng)(zheng)常工作時，額(e)定(ding)(ding)電(dian)(dian)壓沒有(you)實際意義(yi)。貼(tie)片(pian)保(bao)(bao)險(xian)(xian)(xian)絲(si)額(e)定(ding)(ding)電(dian)(dian)壓的真正(zheng)(zheng)意義(yi)在(zai)于其(qi)安全性能。貼(tie)片(pian)保(bao)(bao)險(xian)(xian)(xian)絲(si)作為一種安全元件，在(zai)正(zheng)(zheng)常工作、保(bao)(bao)護(hu)動作和熔(rong)化(hua)后(hou)的任何時間段內都必須是相對安全的。在(zai)熔(rong)接過程(cheng)中和熔(rong)接后(hou)，貼(tie)片(pian)保(bao)(bao)險(xian)(xian)(xian)絲(si)的額(e)定(ding)(ding)電(dian)(dian)壓有(you)著重要作用。貼(tie)片保險絲的額定(ding)電(dian)流(liu)(liu)(liu)是(shi)一(yi)個標(biao)(biao)稱規(gui)(gui)(gui)格，在(zai)產品(pin)標(biao)(biao)準中(zhong)規(gui)(gui)(gui)定(ding)了流(liu)(liu)(liu)過(guo)熔(rong)斷(duan)器的電(dian)流(liu)(liu)(liu)大小和熔(rong)斷(duan)時間，不(bu)同(tong)標(biao)(biao)準的規(gui)(gui)(gui)定(ding)也(ye)不(bu)同(tong)。即使(shi)流(liu)(liu)(liu)過(guo)保險絲的電(dian)流(liu)(liu)(liu)大于其額定(ding)電(dian)流(liu)(liu)(liu)且不(bu)超過(guo)常規(gui)(gui)(gui)電(dian)流(liu)(liu)(liu)，保險絲也(ye)不(bu)應熔(rong)斷(duan)。電(dian)壓(ya)(ya)相對(dui)簡(jian)單，大于比較大工作(zuo)電(dian)壓(ya)(ya)。對(dui)于電(dian)流(liu)(liu)(liu)，一(yi)般的選(xuan)擇標(biao)(biao)準是(shi)工作(zuo)電(dian)流(liu)(liu)(liu)的1.5倍左右，而且范圍是(shi)無害的，因(yin)為貼(tie)片保險絲是(shi)短路過(guo)載保護，在(zai)這(zhe)種情況下(xia)起作(zuo)用。

保(bao)(bao)(bao)險絲熔斷(duan)(duan)與否取決于流(liu)過它(ta)的(de)電(dian)(dian)(dian)流(liu)的(de)大小，與電(dian)(dian)(dian)路(lu)的(de)工(gong)(gong)作(zuo)電(dian)(dian)(dian)壓無關。保(bao)(bao)(bao)險絲的(de)額定(ding)電(dian)(dian)(dian)壓是從安(an)全(quan)使用保(bao)(bao)(bao)險絲角度提出(chu)的(de)，它(ta)是保(bao)(bao)(bao)險絲處(chu)于安(an)全(quan)工(gong)(gong)作(zuo)狀態所安(an)置(zhi)的(de)電(dian)(dian)(dian)路(lu)的(de)最(zui)高(gao)工(gong)(gong)作(zuo)電(dian)(dian)(dian)壓。這說明(ming)保(bao)(bao)(bao)險絲只(zhi)能安(an)置(zhi)在(zai)工(gong)(gong)作(zuo)電(dian)(dian)(dian)壓小于等(deng)于保(bao)(bao)(bao)險絲額定(ding)電(dian)(dian)(dian)壓的(de)電(dian)(dian)(dian)路(lu)中。只(zhi)有(you)這樣(yang)保(bao)(bao)(bao)險絲才能安(an)全(quan)有(you)效地(di)工(gong)(gong)作(zuo)，否則，在(zai)保(bao)(bao)(bao)險絲熔斷(duan)(duan)時將會出(chu)現持續飛弧(hu)和被電(dian)(dian)(dian)壓擊穿(chuan)而危害電(dian)(dian)(dian)路(lu)的(de)現

貼片保險絲額定(ding)電(dian)(dian)壓與電(dian)(dian)流的選擇：電(dian)壓比較簡單，大于(yu)工(gong)作(zuo)最高電(dian)壓即(ji)可。電(dian)流(liu)的(de)(de)(de)話，一(yi)般選擇標準是大于(yu)工(gong)作(zuo)電(dian)流(liu)的(de)(de)(de)1.5倍(bei)左(zuo)右(you)，大概范圍就(jiu)這樣大小點(dian)也無妨，因為保(bao)險絲(si)是短路(lu) 過載保(bao)護這種情(qing)況下起(qi)作(zuo)用。另(ling)外如果(guo)是自恢復(fu)保(bao)險絲(si)的(de)(de)(de)話有個(ge)因素得考慮，就(jiu)是工(gong)作(zuo)的(de)(de)(de)環境溫度。自恢復(fu)保(bao)險絲(si)的(de)(de)(de)工(gong)作(zuo)電(dian)流(liu)是指25度環境溫度情(qing)況下，如果(guo)溫度高于(yu)25度的(de)(de)(de)話 余量你又得再加一(yi)些。

1、安規(gui)認證(zheng)：根據(ju)整(zheng)機所(suo)需(xu)的安規(gui)認證(zheng)決定保險絲的安規(gui)認證(zheng)，如UL規(gui)格(ge)或IEC規(gui)格(ge)。

 2、結構尺(chi)寸(cun)：根據電路設計中的空間決(jue)定尺(chi)寸(cun)的大小，如(ru)長度(du)，直徑，是(shi)否帶引線(xian)等。

3、額定電壓：必(bi)須(xu)大于(yu)或等于(yu)實際應(ying)用(yong)電壓，一般有(you)24V、32V、63V、125V、250V等。

4、分斷能力(li)：應大于電路中的比較大故障電流。

5、額定(ding)電(dian)流：參考以下(xia)幾項而(er)定(ding)：

（1）正常工作(zuo)電(dian)(dian)流(liu)(liu)，在(zai)25℃條件(jian)下運(yun)行   UL規格保險(xian)絲的額(e)定電(dian)(dian)流(liu)(liu)≥正常工作(zuo)電(dian)(dian)流(liu)(liu)/0.75；   IEC規格保險(xian)絲的額(e)定電(dian)(dian)流(liu)(liu)≥正常工作(zuo)電(dian)(dian)流(liu)(liu)/0.9。

（2）環境溫度(du)：保(bao)險(xian)絲的電(dian)流承(cheng)載(zai)能力測試(shi)是在環境溫度(du)25℃條件下(xia)進(jin)行的，環境溫度(du)越高(gao)，保(bao)險(xian)絲的壽命越短，承(cheng)載(zai)能力就越低，所以(yi)選(xuan)用(yong)保(bao)險(xian)絲時應考(kao)慮環境溫度(du)。

（3）脈(mo)沖：脈(mo)沖會產生(sheng)熱循環(huan)，并產生(sheng)會影響(xiang)保險(xian)(xian)絲壽(shou)命的機械(xie)疲(pi)勞，在設計時(shi)應使脈(mo)沖I2T在考慮脈(mo)沖因(yin)數的前提下(xia)小(xiao)于保險(xian)(xian)絲的標稱熔化熱能I2T    保險(xian)(xian)絲額定I2T>實際脈(mo)沖I2T/Pf Pf：脈(mo)沖因(yin)數，依可承受脈(mo)沖次數不(bu)同而不(bu)同。