一、熔斷器是什么東西
熔(rong)(rong)斷器(qi)(qi)(qi)是一種電路的安(an)全(quan)保護裝(zhuang)置,當(dang)電流超(chao)過(guo)規(gui)定值(zhi)時,通過(guo)本(ben)身發熱使熔(rong)(rong)體熔(rong)(rong)斷,從而斷開(kai)電路,廣泛應用于高低(di)壓配電系(xi)統(tong)和控制系(xi)統(tong)以(yi)及用電設備中,作為短路和過(guo)電流的保護器(qi)(qi)(qi),是應用比較(jiao)普遍的保護器(qi)(qi)(qi)件之一,具有價格(ge)便宜、體積(ji)小、短路分斷能(neng)力較(jiao)強、切斷短路更為安(an)全(quan)等(deng)諸多特(te)點(dian)。熔(rong)(rong)斷器(qi)(qi)(qi)種類眾(zhong)多,常(chang)用的主要有插(cha)入式熔(rong)(rong)斷器(qi)(qi)(qi)、螺旋(xuan)式熔(rong)(rong)斷器(qi)(qi)(qi)、封閉式熔(rong)(rong)斷器(qi)(qi)(qi)、快(kuai)速熔(rong)(rong)斷器(qi)(qi)(qi)、自復熔(rong)(rong)斷器(qi)(qi)(qi)等(deng)。
二、熔斷器有什么用
熔(rong)斷(duan)(duan)器(qi)俗(su)稱(cheng)保(bao)險(xian)絲(si),是配(pei)電系統(tong)、控制系統(tong)和用電設備(bei)中常(chang)用的保(bao)護(hu)器(qi)件,它的作用主要是在電路(lu)(lu)發生故障或(huo)異常(chang)時(shi),由于線路(lu)(lu)內電流劇(ju)增,導(dao)線溫(wen)(wen)度升(sheng)高(gao),熔(rong)斷(duan)(duan)器(qi)會在高(gao)溫(wen)(wen)下自身熔(rong)斷(duan)(duan),從而切(qie)斷(duan)(duan)電流,起(qi)到保(bao)護(hu)電路(lu)(lu)安全運行,避免(mian)發生燒毀電路(lu)(lu)、燒壞元器(qi)件、發生火(huo)災等事故的作用。
三、熔斷器的型號含義
熔(rong)斷(duan)(duan)器(qi)的(de)(de)型號一般是(shi)(shi)(shi)有(you)(you)固定(ding)規則的(de)(de),它的(de)(de)型號標識由字(zi)(zi)(zi)母(mu)和(he)數字(zi)(zi)(zi)組成,第(di)一位一般都(dou)是(shi)(shi)(shi)R,這(zhe)是(shi)(shi)(shi)熔(rong)斷(duan)(duan)器(qi)的(de)(de)代(dai)號;第(di)二位則是(shi)(shi)(shi)熔(rong)斷(duan)(duan)器(qi)的(de)(de)型式(shi)(shi)(shi)代(dai)號,由字(zi)(zi)(zi)母(mu)組成,C表(biao)(biao)(biao)示(shi)插入式(shi)(shi)(shi)、L表(biao)(biao)(biao)示(shi)螺旋式(shi)(shi)(shi)、M表(biao)(biao)(biao)示(shi)無填料封(feng)閉管式(shi)(shi)(shi)、L表(biao)(biao)(biao)示(shi)有(you)(you)填料封(feng)閉管式(shi)(shi)(shi);S表(biao)(biao)(biao)示(shi)快速式(shi)(shi)(shi);第(di)三位是(shi)(shi)(shi)數字(zi)(zi)(zi),表(biao)(biao)(biao)示(shi)熔(rong)斷(duan)(duan)器(qi)的(de)(de)設計代(dai)號;第(di)四位表(biao)(biao)(biao)示(shi)的(de)(de)是(shi)(shi)(shi)熔(rong)斷(duan)(duan)器(qi)的(de)(de)額(e)定(ding)電流(liu)(有(you)(you)的(de)(de)還會(hui)標注熔(rong)體的(de)(de)額(e)定(ding)電流(liu))。比(bi)如RL6-25就表(biao)(biao)(biao)示(shi)熔(rong)斷(duan)(duan)器(qi)額(e)定(ding)電流(liu)為25A的(de)(de)螺旋式(shi)(shi)(shi)熔(rong)斷(duan)(duan)器(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,畢竟關系到電路(lu)安全(quan),一定要選(xuan)擇正規的產品。
五、熔斷器工作原理介紹
熔(rong)(rong)斷(duan)器在正常工(gong)作(zuo)情況(kuang)下(xia),電(dian)流從(cong)引線端子A進入,由出(chu)(chu)(chu)線端子B引出(chu)(chu)(chu),正常工(gong)作(zuo),當(dang)出(chu)(chu)(chu)現(xian)短(duan)路故障時(shi),短(duan)路電(dian)流通(tong)過熔(rong)(rong)斷(duan)器,根據焦(jiao)耳定(ding)律,通(tong)過的電(dian)流越大,產生的熱量也越大,在高溫下(xia),熔(rong)(rong)斷(duan)器內部的熔(rong)(rong)體受熱熔(rong)(rong)斷(duan),從(cong)而斷(duan)開電(dian)流,起到(dao)保護電(dian)路的作(zuo)用(yong)。