中頻熔(rong)煉爐：中頻電爐整流(liu)(liu)電路(lu)小電流(liu)(liu)調(diao)試(shi)及大(da)電流(liu)(liu)調(diao)試(shi)兩步(bu)進行(xing)

中頻電(dian)(dian)爐整流(liu)電(dian)(dian)路的帶載調試可(ke)分小(xiao)(xiao)電(dian)(dian)流(liu)調試及大(da)電(dian)(dian)流(liu)調試兩(liang)步(bu)進行(xing)；應在小(xiao)(xiao)電(dian)(dian)流(liu)、滿電(dian)(dian)壓調試的基礎上(shang)，再(zai)進行(xing)大(da)電(dian)(dian)流(liu)調試。

在通電(dian)調(diao)(diao)試(shi)(shi)之前(qian)應斷開(kai)直流平波電(dian)抗器Ld與逆(ni)變(bian)橋的(de)(de)(de)聯接(jie)銅排，斷開(kai)原來接(jie)在Ld后面(mian)的(de)(de)(de)預磁(ci)化對(dui)于380V交流工頻輸入的(de)(de)(de)中(zhong)頻電(dian)爐，可(ke)在Ld后面(mian)接(jie)入約250fl的(de)(de)(de)板(ban)形功率電(dian)阻(zu)RL或三只500w相(xiang)串聯的(de)(de)(de)白熾(chi)燈泡作(zuo)調(diao)(diao)試(shi)(shi)整(zheng)流電(dian)路(lu)用的(de)(de)(de)負載(zai)，同時(shi)，將(jiang)逆(ni)變(bian)控(kong)制電(dian)路(lu)印制板(ban)從電(dian)路(lu)中(zhong)路(lu)調(diao)(diao)試(shi)(shi)時(shi)的(de)(de)(de)聯接(jie)開(kai)現水(shui)泵，調(diao)(diao)節中(zhong)頻電(dian)爐桓的(de)(de)(de)進水(shui)閥門(men)，使冷(leng)卻(que)水(shui)壓(ya)力(li)表讀數為0.06·0.IMPa;調(diao)(diao)整(zheng)冷(leng)卻(que)水(shui)壓(ya)力(li)繼電(dian)器的(de)(de)(de)觸點動作(zuo)調(diao)(diao)節螺釘，使其常開(kai)觸點閉合；檢查(cha)備蔓質(zhi)水(shui)管的(de)(de)(de)出水(shui)情況是否良好。

合上(shang)控制電(dian)(dian)(dian)(dian)源(yuan)開關(guan)，檢查控制部分的表計指示或發(fa)光二(er)極管顯示是(shi)否合乎要求。合上(shang)主接觸器(qi)，調節“功率電(dian)(dian)(dian)(dian)位器(qi)”（一(yi)般是(shi)設在電(dian)(dian)(dian)(dian)柜門上(shang)的），逐(zhu)漸升高直流(liu)(liu)電(dian)(dian)(dian)(dian)壓，直到值。用(yong)示波器(qi)觀(guan)測RL上(shang)的直流(liu)(liu)電(dian)(dian)(dian)(dian)壓波形。正(zheng)常(chang)(chang)工作波形整流(liu)(liu)電(dian)(dian)(dian)(dian)路的正(zheng)常(chang)(chang)輸出直流(liu)(liu)電(dian)(dian)(dian)(dian)壓波形正(zheng)常(chang)(chang)說明各部分電(dian)(dian)(dian)(dian)路關(guan)系正(zheng)常(chang)(chang)。短時間的小電(dian)(dian)(dian)(dian)流(liu)(liu)調試可(ke)利用(yong)原(yuan)有的預磁化(hua)電(dian)(dian)(dian)(dian)阻RH進行，但應注(zhu)意不(bu)應使RH發(fa)熱過甚而損壞。

大電(dian)(dian)(dian)(dian)(dian)流(liu)調(diao)(diao)試(shi)前，能(neng)達到中(zhong)頻電(dian)(dian)(dian)(dian)(dian)源額定(ding)(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)的(de)大功率電(dian)(dian)(dian)(dian)(dian)阻。如100kW的(de)中(zhong)頻電(dian)(dian)(dian)(dian)(dian)源應接人RL一(yi)2.5fl。在(zai)額定(ding)(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)下，整定(ding)(ding)過(guo)電(dian)(dian)(dian)(dian)(dian)流(liu)保護動(dong)(dong)作值(zhi)(zhi)：精細調(diao)(diao)整“過(guo)流(liu)整定(ding)(ding)”電(dian)(dian)(dian)(dian)(dian)位(wei)器(qi)，使過(guo)電(dian)(dian)(dian)(dian)(dian)流(liu)電(dian)(dian)(dian)(dian)(dian)路動(dong)(dong)作，并反復動(dong)(dong)作三(san)次后鎖定(ding)(ding)電(dian)(dian)(dian)(dian)(dian)位(wei)器(qi)值(zhi)(zhi)。此(ci)時(shi)，“過(guo)流(liu)”值(zhi)(zhi)實(shi)際上是額定(ding)(ding)值(zhi)(zhi)，待逆(ni)變(bian)電(dian)(dian)(dian)(dian)(dian)路調(diao)(diao)試(shi)時(shi)再放大其值(zhi)(zhi)（如250A）。

中頻(pin)熔煉(lian)爐爐襯的(de)打(da)結方法

中(zhong)(zhong)頻熔(rong)煉(lian)爐爐襯(chen)的打(da)結方法(fa)(fa)有濕(shi)法(fa)(fa)打(da)結和干法(fa)(fa)打(da)結兩種(zhong)，中(zhong)(zhong)頻熔(rong)煉(lian)爐的兩種(zhong)方法(fa)(fa)均可用(yong)于酸性(xing)爐襯(chen)、中(zhong)(zhong)性(xing)爐襯(chen)、堿性(xing)爐襯(chen)的打(da)結。

濕法(fa)(fa)打(da)結(jie)(jie)(jie)，是指在中(zhong)頻(pin)熔(rong)煉爐(lu)爐(lu)襯打(da)結(jie)(jie)(jie)材(cai)料中(zhong)加入水、水玻(bo)璃、鹵水等膠黏劑(ji)進(jin)行的打(da)結(jie)(jie)(jie)。由于打(da)結(jie)(jie)(jie)材(cai)料中(zhong)含(han)有一定(ding)的水分(fen)，故施工(gong)時粉塵少(shao)，成(cheng)型性好(hao)。但濕法(fa)(fa)打(da)結(jie)(jie)(jie)也存(cun)在一系列的缺(que)點(dian)：打(da)結(jie)(jie)(jie)的中(zhong)頻(pin)熔(rong)煉爐(lu)爐(lu)襯材(cai)料不(bu)夠致密，爐(lu)襯的耐火度有所(suo)(suo)下(xia)(xia)降；爐(lu)襯干燥(zao)所(suo)(suo)消耗(hao)的時間(jian)較長；爐(lu)襯內的水分(fen)氣化(hua)時使感應器的絕緣性能下(xia)(xia)降。處(chu)理(li)不(bu)好(hao)，往(wang)(wang)往(wang)(wang)導(dao)致匝(za)間(jian)大火的擊穿，也可能引起接地短路，因此，對于較大熔(rong)煉爐(lu)應該盡量(liang)避免(mian)采(cai)用濕法(fa)(fa)打(da)結(jie)(jie)(jie)爐(lu)襯。

干(gan)式筑(zhu)爐法(fa)目(mu)前(qian)在(zai)(zai)坩堝(guo)式感應爐，坩堝(guo)爐在(zai)(zai)筑(zhu)爐中(zhong)得(de)到(dao)廣(guang)泛(fan)的應用(yong)。不加膠結(jie)劑的干(gan)式筑(zhu)爐法(fa)可以地發揮爐襯(chen)(chen)材料的耐火性能，使爐襯(chen)(chen)的燒(shao)結(jie)層減(jian)薄，粉狀層加厚，爐襯(chen)(chen)散熱損(sun)失降低，爐襯(chen)(chen)裂紋(wen)的傾向減(jian)小(xiao)，提高爐襯(chen)(chen)的性。

串聯中頻爐用(yong)電條(tiao)件您(nin)須知！

1、中(zhong)頻(pin)感(gan)應熔變壓器容量

目前對于(yu)行業比較(jiao)常(chang)用的(de)SCR全(quan)橋并(bing)聯逆變中(zhong)頻電源，變壓器(qi)(qi)容(rong)量和電源的(de)數(shu)值(zhi)的(de)數(shu)值(zhi)關系式(shi)為：變壓器(qi)(qi)容(rong)量的(de)數(shu)值(zhi) = 電源功率(lv)的(de)數(shu)值(zhi) x 1.2

對于(yu)IGBT半橋串聯逆變(bian)中頻電(dian)源(俗(su)稱一拖二，一臺熔煉一臺保(bao)溫(wen)，兩臺同時(shi)工(gong)作)變(bian)壓器容量和電(dian)源功率的數值關系(xi)式為：變(bian)壓器容量的數值 = 電(dian)源功率的數值 x 1.1

變(bian)壓器(qi)(qi)為整流變(bian)壓器(qi)(qi)為了(le)減(jian)少(shao)諧波的(de)干擾，盡量專機，即一臺(tai)(tai)中頻電(dian)源配置(zhi)一臺(tai)(tai)整流變(bian)壓器(qi)(qi)。

2、中(zhong)頻感應熔(rong)進線電壓

對于(yu)1000KW以下的中(zhong)頻(pin)(pin)電(dian)(dian)(dian)(dian)源(yuan)一般(ban)采用(yong)三相五(wu)線(xian)(xian)制380V，50HZ工(gong)業用(yong)電(dian)(dian)(dian)(dian)，金屬熔(rong)煉爐種(zhong)類，配置(zhi)6脈(mo)沖(chong)單整流(liu)中(zhong)頻(pin)(pin)電(dian)(dian)(dian)(dian)源(yuan);對于(yu)1000KWY以上的中(zhong)頻(pin)(pin)電(dian)(dian)(dian)(dian)源(yuan)則側重于(yu)使(shi)用(yong)660V進(jin)(jin)線(xian)(xian)電(dian)(dian)(dian)(dian)壓(有的廠家使(shi)用(yong)575V或750V，由于(yu)575VZ或750V是(shi)非標準的電(dian)(dian)(dian)(dian)壓等級(ji)，配件不好選購，建議(yi)不要(yao)選擇(ze)使(shi)用(yong))配置(zhi)12脈(mo)沖(chong)的雙整流(liu)中(zhong)頻(pin)(pin)電(dian)(dian)(dian)(dian)源(yuan)，原因有二：一是(shi)通過提高進(jin)(jin)線(xian)(xian)電(dian)(dian)(dian)(dian)壓提高額定工(gong)作電(dian)(dian)(dian)(dian)壓;二是(shi)大功(gong)率產生的諧波(bo)(bo)會干(gan)擾(rao)電(dian)(dian)(dian)(dian)網，通過雙整流(liu)可以獲得較為(wei)平直的直流(liu)電(dian)(dian)(dian)(dian)流(liu)，負載電(dian)(dian)(dian)(dian)流(liu)為(wei)矩形波(bo)(bo)，負載電(dian)(dian)(dian)(dian)壓接(jie)近正弦波(bo)(bo)，減少電(dian)(dian)(dian)(dian)網干(gan)擾(rao)對其他設備(bei)的沖(chong)擊。

有(you)的用戶盲目(mu)的追(zhui)求(qiu)高(gao)電(dian)(dian)壓(有(you)的1000KW使用900V進線電(dian)(dian)壓)，低電(dian)(dian)流以(yi)來(lai)達到節(jie)能(neng)的目(mu)的，豈不知這樣是以(yi)電(dian)(dian)爐(lu)的壽(shou)命(ming)為代價的，得不償失，高(gao)電(dian)(dian)壓容易造成電(dian)(dian)元器件壽(shou)命(ming)縮短，銅排，線纜疲(pi)乏，使電(dian)(dian)爐(lu)壽(shou)命(ming)大打折扣。另外(wai)高(gao)電(dian)(dian)壓對于電(dian)(dian)爐(lu)生產廠(chang)家來(lai)說，在用材(cai)方(fang)面減少了原材(cai)料，節(jie)約了成本。