什么是箔繞電抗器
箔(bo)(bo)繞電(dian)(dian)抗(kang)器(qi)(qi)是(shi)由(you)(you)寬度等于(yu)電(dian)(dian)抗(kang)器(qi)(qi)高度的(de)(de)(de)(de)箔(bo)(bo)紙(zhi)卷繞制而成(cheng)(cheng),在(zai)交流(liu)(liu)(liu)情(qing)況(kuang)下,由(you)(you)于(yu)渦流(liu)(liu)(liu)效(xiao)(xiao)(xiao)應(ying)使流(liu)(liu)(liu)過箔(bo)(bo)紙(zhi)的(de)(de)(de)(de)電(dian)(dian)流(liu)(liu)(liu)趨于(yu)箔(bo)(bo)紙(zhi)邊緣,出現擠(ji)流(liu)(liu)(liu)現象; 擠(ji)流(liu)(liu)(liu)效(xiao)(xiao)(xiao)應(ying)使箔(bo)(bo)片(pian)的(de)(de)(de)(de)交流(liu)(liu)(liu)電(dian)(dian)阻(zu)遠(yuan)大(da)(da)于(yu)直(zhi)流(liu)(liu)(liu)電(dian)(dian)阻(zu),交流(liu)(liu)(liu)功(gong)耗遠(yuan)大(da)(da)于(yu)直(zhi)流(liu)(liu)(liu)功(gong)耗。為減小箔(bo)(bo)式電(dian)(dian)抗(kang)器(qi)(qi)的(de)(de)(de)(de)擠(ji)流(liu)(liu)(liu)效(xiao)(xiao)(xiao)應(ying).實際設計中通(tong)常是(shi)在(zai)電(dian)(dian)抗(kang)器(qi)(qi)高度方(fang)向(xiang)上進(jin)行(xing)分(fen)裂,再進(jin)行(xing)串(chuan)并聯組合。上述措施往往需要特殊(shu)的(de)(de)(de)(de)工藝來完(wan)成(cheng)(cheng)。但(dan)隨(sui)著分(fen)裂段數的(de)(de)(de)(de)增(zeng)(zeng)加,雖然在(zai)一定(ding)程度上減小了擠(ji)流(liu)(liu)(liu)效(xiao)(xiao)(xiao)應(ying),卻使制動電(dian)(dian)阻(zu)成(cheng)(cheng)倍增(zeng)(zeng)大(da)(da)。并沒(mei)有(you)起到降(jiang)低功(gong)耗的(de)(de)(de)(de)作用。以(yi)上原因使箔(bo)(bo)式電(dian)(dian)抗(kang)器(qi)(qi)在(zai)制造及(ji)應(ying)用方(fang)面受到極大(da)(da)的(de)(de)(de)(de)限制。
電抗器的箔繞與線繞性能哪種好,它們有什么區別
線繞(rao)的趨膚(fu)效應高,適用(yong)(yong)于(yu)滯(zhi)留(liu)或(huo)低頻交流電(dian)流,由一根(gen)(gen)線或(huo)多(duo)根(gen)(gen)線并繞(rao)而成(cheng),主要(yao)用(yong)(yong)于(yu)低電(dian)壓、小容量(liang)。線繞(rao)電(dian)抗器用(yong)(yong)于(yu)電(dian)流小于(yu)200A以(yi)下,一般(ban)用(yong)(yong)于(yu)無功補(bu)償系(xi)統與(yu)電(dian)力電(dian)容器串聯使用(yong)(yong)。
  箔(bo)繞(rao)(rao)的趨膚效應低(di),適用于(yu)高頻交流電流。一般用于(yu)與(yu)變(bian)頻器(qi)輸入與(yu)輸出(chu),箔(bo)繞(rao)(rao)采用高導(dao)(dao)電率的銅箔(bo)或(huo)鋁(lv)箔(bo)作為導(dao)(dao)電材料,銅箔(bo)或(huo)鋁(lv)箔(bo)的厚度(du)為0.1-2.5mm左右,電氣強度(du)好(hao),沖擊梯(ti)度(du)電壓(ya)分布均(jun)勻,便于(yu)繞(rao)(rao)制(zhi)。
所謂趨膚效(xiao)應(ying)(ying):對于(yu)導(dao)(dao)(dao)(dao)體(ti)中的交流(liu)(liu)電(dian)流(liu)(liu),靠近導(dao)(dao)(dao)(dao)體(ti)表面處的電(dian)流(liu)(liu)密(mi)度大于(yu)導(dao)(dao)(dao)(dao)體(ti)內(nei)部(bu)電(dian)流(liu)(liu)密(mi)度的現(xian)象,隨著電(dian)流(liu)(liu)頻率的提高,趨膚效(xiao)應(ying)(ying)使導(dao)(dao)(dao)(dao)體(ti)的電(dian)阻(zu)增(zeng)大,電(dian)感減小(xiao)。而導(dao)(dao)(dao)(dao)線(xian)內(nei)部(bu)實際(ji)上電(dian)流(liu)(liu)很(hen)小(xiao),電(dian)流(liu)(liu)集中在臨近導(dao)(dao)(dao)(dao)線(xian)外表的一薄層,結果(guo)使它的電(dian)阻(zu)增(zeng)加(jia),導(dao)(dao)(dao)(dao)線(xian)電(dian)阻(zu)的增(zeng)加(jia)使它的損耗功率也增(zeng)加(jia),這現(xian)象稱趨膚效(xiao)應(ying)(ying)。頻率越高,趨膚效(xiao)應(ying)(ying)越顯著。
導體(ti)(ti)材(cai)質主要有鋁線(xian)(xian)?銅(tong)線(xian)(xian),鋁箔(bo),銅(tong)箔(bo);鋁線(xian)(xian)成本最(zui)低,銅(tong)箔(bo)成本最(zui)高,從材(cai)質區(qu)別:銅(tong)繞(rao)比箔(bo)繞(rao)的(de)性能(neng)好(hao)很多;從趨膚效(xiao)應(ying):箔(bo)的(de)電(dian)子導體(ti)(ti)表面,過電(dian)流能(neng)力強;從價值(zhi):線(xian)(xian)繞(rao)比線(xian)(xian)箔(bo)繞(rao)穩定(ding)性更(geng)高;從溫升:線(xian)(xian)繞(rao)的(de)溫度梯度低,熱穩定(ding)性好(hao)。從外觀(guan):大電(dian)流箔(bo)繞(rao)美(mei)觀(guan),小電(dian)流線(xian)(xian)繞(rao)平(ping)整(zheng)度好(hao),外觀(guan)一致(zhi)。