一、屏蔽線是什么

屏(ping)蔽(bi)(bi)線(xian)(xian)(xian)(xian)是使用網狀編織導(dao)(dao)線(xian)(xian)(xian)(xian)把信(xin)號(hao)(hao)線(xian)(xian)(xian)(xian)包(bao)裹起來(lai)的(de)(de)傳輸線(xian)(xian)(xian)(xian)。導(dao)(dao)線(xian)(xian)(xian)(xian)外(wai)部有導(dao)(dao)體(ti)包(bao)裹的(de)(de)導(dao)(dao)線(xian)(xian)(xian)(xian)叫(jiao)屏(ping)蔽(bi)(bi)線(xian)(xian)(xian)(xian)，包(bao)裹的(de)(de)導(dao)(dao)體(ti)叫(jiao)屏(ping)蔽(bi)(bi)層，一般(ban)為編織銅網或（鋁(lv)），屏(ping)蔽(bi)(bi)層需要(yao)接地，外(wai)來(lai)的(de)(de)干擾信(xin)號(hao)(hao)可被該層導(dao)(dao)入大地，避免干擾信(xin)號(hao)(hao)進(jin)入內層導(dao)(dao)體(ti)干攏同時降低傳輸信(xin)號(hao)(hao)的(de)(de)損耗。

屏(ping)(ping)(ping)蔽電纜的(de)(de)屏(ping)(ping)(ping)蔽層(ceng)主(zhu)要由(you)銅(tong)、鋁等非磁性材(cai)料制成，并且(qie)厚(hou)度(du)很薄，遠小(xiao)(xiao)于使用頻(pin)率(lv)上(shang)金屬材(cai)料的(de)(de)集膚深度(du)（所謂趨(qu)膚效(xiao)應是(shi)指電流在導體(ti)截面(mian)的(de)(de)分布隨頻(pin)率(lv)的(de)(de)升高(gao)而(er)趨(qu)于導體(ti)表面(mian)分布，頻(pin)率(lv)越(yue)(yue)高(gao)，趨(qu)膚深度(du)越(yue)(yue)小(xiao)(xiao)，即頻(pin)率(lv)越(yue)(yue)高(gao)，電磁波的(de)(de)穿(chuan)透能力越(yue)(yue)弱），屏(ping)(ping)(ping)蔽層(ceng)的(de)(de)效(xiao)果主(zhu)要不是(shi)由(you)于金屬體(ti)本身(shen)對電場、磁場的(de)(de)反(fan)射、吸收而(er)產(chan)生(sheng)的(de)(de)，而(er)是(shi)由(you)于屏(ping)(ping)(ping)蔽層(ceng)的(de)(de)接(jie)地產(chan)生(sheng)的(de)(de)，接(jie)地的(de)(de)形(xing)式(shi)不同(tong)將直(zhi)接(jie)影響屏(ping)(ping)(ping)蔽效(xiao)果。

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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平方毫米）稱為大電線，較小的（小于(yu)或(huo)等于(yu)6平方毫米）稱為小電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)(xian)(xian)，絕緣電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)(xian)(xian)又稱為布(bu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)(xian)(xian)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)(xian)(xian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)主要(yao)包括裸線(xian)(xian)(xian)(xian)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁線(xian)(xian)(xian)(xian)及電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)用絕緣電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)(xian)(xian)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(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)纜(lan)(lan)(lan)與光纜(lan)(lan)(lan)。電(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)力(li)電(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)纜(lan)(lan)(lan)、補償(chang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、屏蔽電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、高溫電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、計(ji)算機(ji)電(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)纜(lan)(lan)(lan)、同軸電(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)纜(lan)(lan)(lan)、船(chuan)用電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)等(deng)等(deng)。它們都是由多股導(dao)線(xian)(xian)(xian)(xian)組成(cheng)，用來(lai)連接電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)等(deng)。

普通：絕緣層+屏蔽層+導線。高級：絕緣(yuan)層+屏蔽(bi)層+信號導(dao)線+屏(ping)蔽層接(jie)地導線。

三、屏蔽線型號

AVSSBS是日系(xi)的(de)單芯、AVSSBS2*是雙芯、N901 906。02是德(de)系的三芯。

四、屏蔽線的作用

屏蔽層一般需要接地。屏蔽線的(de)作(zuo)用是將電磁場(chang)噪聲源(yuan)與(yu)敏(min)感(gan)設備隔離，切(qie)斷(duan)噪聲源(yuan)的(de)傳播路徑。

屏(ping)蔽(bi)(bi)分為(wei)(wei)主(zhu)動(dong)(dong)屏(ping)蔽(bi)(bi)和被動(dong)(dong)屏(ping)蔽(bi)(bi)，主(zhu)動(dong)(dong)屏(ping)蔽(bi)(bi)目(mu)的(de)是為(wei)(wei)了防(fang)止(zhi)噪聲源向外輻射，是對(dui)噪聲源的(de)屏(ping)蔽(bi)(bi)；被動(dong)(dong)屏(ping)蔽(bi)(bi)目(mu)的(de)是為(wei)(wei)了防(fang)止(zhi)敏感(gan)設(she)備遭到噪聲源的(de)干擾，是對(dui)敏感(gan)設(she)備的(de)屏(ping)蔽(bi)(bi)。

屏(ping)蔽線(xian)的(de)屏(ping)蔽層不(bu)允許(xu)多(duo)點(dian)接(jie)地(di)，因為不(bu)同的(de)接(jie)地(di)點(dian)總是(shi)不(bu)一樣的(de)，各(ge)點(dian)存在電位差。如多(duo)點(dian)接(jie)地(di)，在屏(ping)蔽層形成電流，感(gan)應到(dao)導線(xian)上形成電流，感(gan)應到(dao)信號線(xian)上形成干(gan)擾，不(bu)但起不(bu)到(dao)屏(ping)蔽作用，反而引進干(gan)擾，尤其在變頻器用的(de)多(duo)的(de)場(chang)合(he)里，干(gan)擾中含有各(ge)種高次(ci)諧波分量(liang)，造(zao)成影響更大(da)，應特別注意。