由于介質需要維持的溫度不一樣,所以電伴熱帶的型號也是不一樣的,如自限溫電伴熱帶和恒功率電伴熱帶,其中并聯恒功率電伴熱帶又分為單相和三相,那么單相并聯恒功率和三相并聯恒功率電伴熱帶有什么區別呢?
并(bing)聯恒功率電(dian)(dian)(dian)伴熱帶(dai)電(dian)(dian)(dian)源母(mu)線(xian)(xian)(xian)為二根/三根平行絕緣(yuan)銅線(xian)(xian)(xian),在內絕緣(yuan)層上纏繞電(dian)(dian)(dian)熱絲,并(bing)將電(dian)(dian)(dian)熱絲每隔一定距離(既“發(fa)熱節長”)與母(mu)線(xian)(xian)(xian)連接(jie),形(xing)成連續并(bing)聯電(dian)(dian)(dian)阻。母(mu)線(xian)(xian)(xian)通電(dian)(dian)(dian)后(hou),各并(bing)聯電(dian)(dian)(dian)阻發(fa)熱,因(yin)而形(xing)成一條連續的加熱電(dian)(dian)(dian)纜(lan)。
單(dan)相(xiang)恒功率與三(san)相(xiang)恒功率電伴熱帶的原理基(ji)本(ben)相(xiang)同(tong),不同(tong)的地方在(zai)于:
1.單相(xiang)(xiang)采(cai)用(yong)單相(xiang)(xiang)供電,三(san)相(xiang)(xiang)采(cai)用(yong)三(san)相(xiang)(xiang)三(san)角形(xing)供電。
2.三相除有(you)單(dan)相電(dian)(dian)伴熱帶的特點外,它的較大允許使用長(chang)度是(shi)單(dan)相的3倍,在大規模應用電(dian)(dian)伴熱帶的場(chang)合(he),能均(jun)衡(heng)電(dian)(dian)網負載。
3.三相恒(heng)功率電(dian)伴(ban)熱(re)帶采用3根芯線(xian)(xian),使得電(dian)伴(ban)熱(re)帶更(geng)趨扁平,降(jiang)低了(le)(le)表面發(fa)熱(re)負荷,增加(jia)了(le)(le)對管(guan)線(xian)(xian)的熱(re)傳導(dao)面積,提(ti)高了(le)(le)熱(re)傳輸效率。