一、屏蔽線是什么

屏(ping)蔽線是使(shi)用(yong)網狀(zhuang)編(bian)(bian)織導(dao)線把信號線包裹(guo)起來的傳(chuan)輸(shu)線。導(dao)線外部有導(dao)體包裹(guo)的導(dao)線叫屏(ping)蔽線，包裹(guo)的導(dao)體叫屏(ping)蔽層，一般為編(bian)(bian)織銅網或（鋁），屏(ping)蔽層需要接地，外來的干(gan)擾(rao)信號可(ke)被(bei)該(gai)層導(dao)入大地，避免干(gan)擾(rao)信號進入內(nei)層導(dao)體干(gan)攏同時降低傳(chuan)輸(shu)信號的損耗。

屏(ping)蔽(bi)電(dian)纜的(de)(de)(de)(de)屏(ping)蔽(bi)層主要(yao)由(you)(you)(you)銅、鋁等非(fei)磁(ci)性(xing)材料制(zhi)成，并且厚度(du)很薄，遠小于使用頻率上金屬材料的(de)(de)(de)(de)集膚(fu)深(shen)度(du)（所謂趨膚(fu)效(xiao)應是指電(dian)流在導體截面的(de)(de)(de)(de)分布(bu)隨頻率的(de)(de)(de)(de)升高而趨于導體表面分布(bu)，頻率越高，趨膚(fu)深(shen)度(du)越小，即頻率越高，電(dian)磁(ci)波的(de)(de)(de)(de)穿透能力越弱），屏(ping)蔽(bi)層的(de)(de)(de)(de)效(xiao)果(guo)主要(yao)不是由(you)(you)(you)于金屬體本身對電(dian)場(chang)、磁(ci)場(chang)的(de)(de)(de)(de)反射、吸收而產生的(de)(de)(de)(de)，而是由(you)(you)(you)于屏(ping)蔽(bi)層的(de)(de)(de)(de)接(jie)地產生的(de)(de)(de)(de)，接(jie)地的(de)(de)(de)(de)形式(shi)不同將直接(jie)影響屏(ping)蔽(bi)效(xiao)果(guo)。

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二、屏蔽線分類

主要包括裸線、電磁線及電機電器用絕緣電線、電力電纜、通信電纜與光纜。電線電纜是指用于電力、通信及相關傳輸用途的材料。“電線”和“電纜”并沒有嚴格的界限。通常將芯數少、產品直徑小、結構簡單的產品稱為電線，沒有絕緣的稱為裸電線，其他的稱為電纜；導體截面積較大的（大于6平(ping)方毫米(mi)）稱為大電線，較小的（小于或等于6平方(fang)毫(hao)米(mi)）稱為小電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)，絕(jue)緣(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)又(you)稱為布電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)主要包括裸線(xian)(xian)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)線(xian)(xian)及電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器用絕(jue)緣(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、通信(xin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)與光纜(lan)(lan)(lan)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)有(you)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、控制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、補(bu)償電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、屏(ping)蔽電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、高(gao)溫(wen)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、計(ji)算(suan)機(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、信(xin)號電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、同軸電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、耐(nai)火電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、船用電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)等等。它(ta)們都是(shi)由多(duo)股導線(xian)(xian)組(zu)成，用來連接(jie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器等。

普通：絕緣層+屏(ping)蔽(bi)層+導線。高級：絕緣層+屏蔽層+信(xin)號導線+屏蔽層(ceng)接地導線。

三、屏蔽線型號

AVSSBS是日系的單芯、AVSSBS2*是雙芯、N901 906。02是(shi)德系的三芯。

四、屏蔽線的作用

屏蔽(bi)層一般需(xu)要(yao)接地。屏蔽(bi)線的作用是將電磁場噪聲(sheng)源與(yu)敏感(gan)設備隔離，切斷噪聲(sheng)源的傳播路(lu)徑。

屏(ping)(ping)(ping)蔽(bi)(bi)分為(wei)主動(dong)屏(ping)(ping)(ping)蔽(bi)(bi)和(he)被(bei)(bei)動(dong)屏(ping)(ping)(ping)蔽(bi)(bi)，主動(dong)屏(ping)(ping)(ping)蔽(bi)(bi)目的是(shi)(shi)為(wei)了防止噪(zao)聲源向外輻射(she)，是(shi)(shi)對(dui)噪(zao)聲源的屏(ping)(ping)(ping)蔽(bi)(bi)；被(bei)(bei)動(dong)屏(ping)(ping)(ping)蔽(bi)(bi)目的是(shi)(shi)為(wei)了防止敏(min)感(gan)設備遭(zao)到噪(zao)聲源的干擾，是(shi)(shi)對(dui)敏(min)感(gan)設備的屏(ping)(ping)(ping)蔽(bi)(bi)。

屏蔽線的(de)(de)屏蔽層(ceng)不(bu)允許多點(dian)接地(di)，因為不(bu)同的(de)(de)接地(di)點(dian)總是不(bu)一樣的(de)(de)，各點(dian)存在(zai)電位差。如多點(dian)接地(di)，在(zai)屏蔽層(ceng)形(xing)成(cheng)(cheng)電流(liu)，感(gan)(gan)應到(dao)導線上形(xing)成(cheng)(cheng)電流(liu)，感(gan)(gan)應到(dao)信號線上形(xing)成(cheng)(cheng)干(gan)擾(rao)，不(bu)但起不(bu)到(dao)屏蔽作用，反(fan)而引進干(gan)擾(rao)，尤其(qi)在(zai)變頻器用的(de)(de)多的(de)(de)場合里，干(gan)擾(rao)中含有各種高(gao)次諧波分量(liang)，造成(cheng)(cheng)影響更大，應特別(bie)注意。