一、熔斷器是什么東西
熔(rong)斷器(qi)(qi)是(shi)一種電(dian)(dian)路的(de)安全保(bao)護裝(zhuang)置,當電(dian)(dian)流(liu)超(chao)過(guo)規定值時,通(tong)過(guo)本身(shen)發熱使熔(rong)體(ti)(ti)熔(rong)斷,從而斷開電(dian)(dian)路,廣泛應(ying)(ying)用(yong)于(yu)高(gao)低壓配(pei)電(dian)(dian)系統和控(kong)制系統以及用(yong)電(dian)(dian)設備中,作為短(duan)路和過(guo)電(dian)(dian)流(liu)的(de)保(bao)護器(qi)(qi),是(shi)應(ying)(ying)用(yong)比(bi)較(jiao)(jiao)普遍的(de)保(bao)護器(qi)(qi)件之(zhi)一,具有價(jia)格便宜、體(ti)(ti)積小、短(duan)路分(fen)斷能力(li)較(jiao)(jiao)強、切斷短(duan)路更為安全等諸多(duo)特點(dian)。熔(rong)斷器(qi)(qi)種類(lei)眾多(duo),常用(yong)的(de)主(zhu)要有插入(ru)式熔(rong)斷器(qi)(qi)、螺(luo)旋式熔(rong)斷器(qi)(qi)、封閉式熔(rong)斷器(qi)(qi)、快(kuai)速(su)熔(rong)斷器(qi)(qi)、自復熔(rong)斷器(qi)(qi)等。
二、熔斷器有什么用
熔(rong)(rong)斷(duan)(duan)器(qi)(qi)俗稱保險絲,是(shi)配電(dian)系(xi)統(tong)、控(kong)制系(xi)統(tong)和(he)用(yong)(yong)電(dian)設備(bei)中常(chang)用(yong)(yong)的(de)保護(hu)器(qi)(qi)件,它(ta)的(de)作用(yong)(yong)主要是(shi)在電(dian)路(lu)發生(sheng)(sheng)故障(zhang)或異常(chang)時,由于線路(lu)內電(dian)流(liu)劇(ju)增,導(dao)線溫(wen)度升高,熔(rong)(rong)斷(duan)(duan)器(qi)(qi)會在高溫(wen)下自身熔(rong)(rong)斷(duan)(duan),從而切(qie)斷(duan)(duan)電(dian)流(liu),起到保護(hu)電(dian)路(lu)安全運行,避免(mian)發生(sheng)(sheng)燒毀電(dian)路(lu)、燒壞(huai)元器(qi)(qi)件、發生(sheng)(sheng)火災等(deng)事故的(de)作用(yong)(yong)。
三、熔斷器的型號含義
熔(rong)(rong)(rong)斷(duan)器(qi)(qi)的(de)(de)(de)型(xing)號(hao)一(yi)般是有固定(ding)規則(ze)的(de)(de)(de),它的(de)(de)(de)型(xing)號(hao)標識(shi)由字母和數字組(zu)成,第(di)一(yi)位(wei)一(yi)般都是R,這是熔(rong)(rong)(rong)斷(duan)器(qi)(qi)的(de)(de)(de)代號(hao);第(di)二位(wei)則(ze)是熔(rong)(rong)(rong)斷(duan)器(qi)(qi)的(de)(de)(de)型(xing)式(shi)(shi)代號(hao),由字母組(zu)成,C表(biao)(biao)示(shi)(shi)(shi)插(cha)入(ru)式(shi)(shi)、L表(biao)(biao)示(shi)(shi)(shi)螺旋(xuan)式(shi)(shi)、M表(biao)(biao)示(shi)(shi)(shi)無(wu)填(tian)料封閉(bi)管式(shi)(shi)、L表(biao)(biao)示(shi)(shi)(shi)有填(tian)料封閉(bi)管式(shi)(shi);S表(biao)(biao)示(shi)(shi)(shi)快(kuai)速式(shi)(shi);第(di)三位(wei)是數字,表(biao)(biao)示(shi)(shi)(shi)熔(rong)(rong)(rong)斷(duan)器(qi)(qi)的(de)(de)(de)設計(ji)代號(hao);第(di)四位(wei)表(biao)(biao)示(shi)(shi)(shi)的(de)(de)(de)是熔(rong)(rong)(rong)斷(duan)器(qi)(qi)的(de)(de)(de)額(e)定(ding)電(dian)流(有的(de)(de)(de)還會標注(zhu)熔(rong)(rong)(rong)體的(de)(de)(de)額(e)定(ding)電(dian)流)。比如RL6-25就(jiu)表(biao)(biao)示(shi)(shi)(shi)熔(rong)(rong)(rong)斷(duan)器(qi)(qi)額(e)定(ding)電(dian)流為25A的(de)(de)(de)螺旋(xuan)式(shi)(shi)熔(rong)(rong)(rong)斷(duan)器(qi)(qi)。
四、熔斷器選型方法
熔斷器型號的選擇一般包括熔斷器類型選擇和熔體額定電流確定兩個方面:1、熔斷器類型的選擇:在選擇熔斷器類型時,應根據負載的保護特性和短路電流大小來選擇。2、熔體與熔斷器額定電流的確定:熔體額定電流大小與負載大小、負載性質有關。除了型號以外,還要注意所選擇的熔斷器品牌,畢竟關系(xi)到電路安全(quan),一定(ding)要選擇正(zheng)規的(de)產品(pin)。
五、熔斷器工作原理介紹
熔斷(duan)(duan)器在(zai)正常工作(zuo)情況下(xia),電流從引(yin)線端子A進入,由出(chu)線端子B引(yin)出(chu),正常工作(zuo),當出(chu)現短路故障時,短路電流通過(guo)熔斷(duan)(duan)器,根據(ju)焦耳定律,通過(guo)的(de)(de)電流越大,產(chan)生的(de)(de)熱量也越大,在(zai)高溫下(xia),熔斷(duan)(duan)器內(nei)部的(de)(de)熔體受熱熔斷(duan)(duan),從而斷(duan)(duan)開(kai)電流,起到保護電路的(de)(de)作(zuo)用。