一、屏蔽線是什么

屏(ping)蔽線是使(shi)用網狀編(bian)織(zhi)導線把信(xin)號(hao)線包(bao)裹(guo)起來的傳(chuan)輸線。導線外部有導體(ti)(ti)(ti)包(bao)裹(guo)的導線叫(jiao)屏(ping)蔽線，包(bao)裹(guo)的導體(ti)(ti)(ti)叫(jiao)屏(ping)蔽層(ceng)(ceng)，一般為編(bian)織(zhi)銅(tong)網或(huo)（鋁(lv)），屏(ping)蔽層(ceng)(ceng)需(xu)要接地，外來的干(gan)擾信(xin)號(hao)可被(bei)該層(ceng)(ceng)導入大地，避(bi)免(mian)干(gan)擾信(xin)號(hao)進入內層(ceng)(ceng)導體(ti)(ti)(ti)干(gan)攏同時降低(di)傳(chuan)輸信(xin)號(hao)的損(sun)耗(hao)。

屏(ping)(ping)蔽(bi)電(dian)纜的屏(ping)(ping)蔽(bi)層主(zhu)要由銅(tong)、鋁等非磁性材料制(zhi)成，并(bing)且厚度(du)很薄(bo)，遠小于(yu)使(shi)用頻率(lv)上(shang)金屬材料的集膚(fu)深度(du)（所謂趨(qu)(qu)膚(fu)效(xiao)(xiao)應(ying)是(shi)(shi)指電(dian)流(liu)在導體(ti)截面的分布隨(sui)頻率(lv)的升高(gao)而趨(qu)(qu)于(yu)導體(ti)表面分布，頻率(lv)越高(gao)，趨(qu)(qu)膚(fu)深度(du)越小，即頻率(lv)越高(gao)，電(dian)磁波的穿透(tou)能力越弱），屏(ping)(ping)蔽(bi)層的效(xiao)(xiao)果(guo)主(zhu)要不是(shi)(shi)由于(yu)金屬體(ti)本身對電(dian)場、磁場的反射、吸(xi)收而產生(sheng)的，而是(shi)(shi)由于(yu)屏(ping)(ping)蔽(bi)層的接(jie)地產生(sheng)的，接(jie)地的形式不同將(jiang)直接(jie)影(ying)響屏(ping)(ping)蔽(bi)效(xiao)(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平方(fang)毫米(mi)）稱為大電線，較小的（小于(yu)或等于(yu)6平方毫米）稱(cheng)(cheng)為小電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)，絕緣電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)又稱(cheng)(cheng)為布電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)主要包(bao)括裸線(xian)(xian)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)線(xian)(xian)及電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器用絕緣電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)線(xian)(xian)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)、通信(xin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)與(yu)光纜(lan)(lan)(lan)(lan)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)有電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)、控制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)、補償電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)、屏(ping)蔽電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)、高溫電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)、計算機電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)、信(xin)號(hao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)、同軸電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)、耐火電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)、船用電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)等(deng)等(deng)。它們都是(shi)由多股導(dao)線(xian)(xian)組成，用來連(lian)接(jie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器等(deng)。

普(pu)通：絕緣(yuan)層+屏蔽(bi)層(ceng)+導線(xian)。高級：絕緣層+屏(ping)蔽層+信(xin)號導線+屏蔽層接地(di)導線。

三、屏蔽線型號

AVSSBS是(shi)日系的(de)單芯、AVSSBS2*是雙芯、N901 906。02是德系的(de)三芯。

四、屏蔽線的作用

屏(ping)蔽層(ceng)一般(ban)需要接地(di)。屏(ping)蔽線的作用是(shi)將電磁場(chang)噪(zao)聲源與(yu)敏感(gan)設備隔(ge)離(li)，切斷(duan)噪(zao)聲源的傳播路徑(jing)。

屏蔽(bi)(bi)(bi)分為主(zhu)動(dong)(dong)屏蔽(bi)(bi)(bi)和被(bei)動(dong)(dong)屏蔽(bi)(bi)(bi)，主(zhu)動(dong)(dong)屏蔽(bi)(bi)(bi)目(mu)(mu)的(de)是(shi)為了防(fang)止(zhi)噪(zao)聲源向外(wai)輻射，是(shi)對噪(zao)聲源的(de)屏蔽(bi)(bi)(bi)；被(bei)動(dong)(dong)屏蔽(bi)(bi)(bi)目(mu)(mu)的(de)是(shi)為了防(fang)止(zhi)敏感設備遭到噪(zao)聲源的(de)干擾(rao)，是(shi)對敏感設備的(de)屏蔽(bi)(bi)(bi)。

屏蔽(bi)線(xian)的屏蔽(bi)層(ceng)不(bu)(bu)允(yun)許多(duo)(duo)(duo)點(dian)(dian)接地(di)，因為不(bu)(bu)同的接地(di)點(dian)(dian)總是不(bu)(bu)一樣(yang)的，各點(dian)(dian)存(cun)在(zai)電(dian)位差。如多(duo)(duo)(duo)點(dian)(dian)接地(di)，在(zai)屏蔽(bi)層(ceng)形成(cheng)電(dian)流，感(gan)應到導線(xian)上形成(cheng)電(dian)流，感(gan)應到信號線(xian)上形成(cheng)干擾(rao)，不(bu)(bu)但起不(bu)(bu)到屏蔽(bi)作用，反(fan)而引(yin)進干擾(rao)，尤其在(zai)變頻(pin)器用的多(duo)(duo)(duo)的場合里(li)，干擾(rao)中含有各種高次諧波分量，造成(cheng)影響更大，應特別注意。