珠海屏蔽線-延慶PVC屏蔽線-上海PVC屏蔽線

珠海屏蔽線-延慶PVC屏蔽線-上海PVC屏蔽線。

當采(cai)用屏(ping)蔽(bi)電(dian)纜時其屏(ping)蔽(bi)層(ceng)(ceng)應至少在(zai)兩端等(deng)電(dian)位(wei)連(lian)接，當系統要(yao)求只在(zai)一端做(zuo)等(deng)電(dian)位(wei)連(lian)接時，應采(cai)用兩層(ceng)(ceng)屏(ping)蔽(bi)，外層(ceng)(ceng)屏(ping)蔽(bi)按前述要(yao)求處(chu)理。

其原理是：

1. 單層屏蔽一(yi)端(duan)接地，不形(xing)成電位差，一(yi)般用于(yu)防靜電感應(ying)。

2.雙層(ceng)(ceng)屏(ping)(ping)(ping)(ping)蔽，外(wai)層(ceng)(ceng)屏(ping)(ping)(ping)(ping)蔽兩端(duan)(duan)接(jie)(jie)地(di)，內層(ceng)(ceng)屏(ping)(ping)(ping)(ping)蔽一端(duan)(duan)等電(dian)(dian)位接(jie)(jie)地(di)。此時，外(wai)層(ceng)(ceng)屏(ping)(ping)(ping)(ping)蔽由于電(dian)(dian)位差而感應出電(dian)(dian)流，因此產生降低源磁場強(qiang)度的(de)磁通，從而基(ji)本上(shang)抵消掉(diao)沒有(you)外(wai)屏(ping)(ping)(ping)(ping)蔽層(ceng)(ceng)時所感應的(de)電(dian)(dian)壓。如果是(shi)(shi)防止靜(jing)電(dian)(dian)干擾，***單(dan)點接(jie)(jie)地(di)，不論是(shi)(shi)一層(ceng)(ceng)還(huan)是(shi)(shi)二(er)層(ceng)(ceng)屏(ping)(ping)(ping)(ping)蔽。因為單(dan)點接(jie)(jie)地(di)的(de)靜(jing)電(dian)(dian)放(fang)電(dian)(dian)速(su)度是(shi)(shi)快的(de)。

但是(shi)(shi)，以下(xia)兩種(zhong)情況(kuang)除(chu)外(wai)(wai)：外(wai)(wai)部(bu)(bu)有(you)強電(dian)(dian)流(liu)干(gan)擾，單(dan)點(dian)(dian)接(jie)(jie)地(di)無法滿足靜電(dian)(dian)的(de)快放電(dian)(dian)。如果接(jie)(jie)地(di)線(xian)截面(mian)積很大，能(neng)夠保證靜電(dian)(dian)快放電(dian)(dian)的(de)話，同(tong)樣也(ye)要(yao)單(dan)點(dian)(dian)接(jie)(jie)地(di)。當然了，真是(shi)(shi)那樣，也(ye)沒有(you)必要(yao)選擇(ze)兩層(ceng)(ceng)(ceng)屏(ping)(ping)(ping)蔽。否則，***兩層(ceng)(ceng)(ceng)屏(ping)(ping)(ping)蔽，外(wai)(wai)層(ceng)(ceng)(ceng)屏(ping)(ping)(ping)蔽主(zhu)要(yao)是(shi)(shi)減(jian)少干(gan)擾強度，不是(shi)(shi)消除(chu)干(gan)擾，這時***多(duo)點(dian)(dian)接(jie)(jie)地(di)，雖然放不完，但***盡快減(jian)弱(ruo)，要(yao)減(jian)弱(ruo)，多(duo)點(dian)(dian)接(jie)(jie)地(di)是(shi)(shi)佳選擇(ze)。比如，企(qi)業(ye)中的(de)電(dian)(dian)纜(lan)橋架(jia)其(qi)實就是(shi)(shi)外(wai)(wai)屏(ping)(ping)(ping)蔽層(ceng)(ceng)(ceng)，它(ta)是(shi)(shi)***多(duo)點(dian)(dian)接(jie)(jie)地(di)的(de)，***道防(fang)線(xian)，減(jian)小(xiao)干(gan)擾源(yuan)的(de)強度。內層(ceng)(ceng)(ceng)屏(ping)(ping)(ping)蔽層(ceng)(ceng)(ceng)（其(qi)實，大家不會買雙層(ceng)(ceng)(ceng)的(de)電(dian)(dian)纜(lan)，一般(ban)是(shi)(shi)外(wai)(wai)層(ceng)(ceng)(ceng)就是(shi)(shi)電(dian)(dian)纜(lan)橋架(jia)，內層(ceng)(ceng)(ceng)才是(shi)(shi)屏(ping)(ping)(ping)蔽電(dian)(dian)纜(lan)的(de)屏(ping)(ping)(ping)蔽層(ceng)(ceng)(ceng)）***單(dan)點(dian)(dian)接(jie)(jie)地(di)，因為外(wai)(wai)部(bu)(bu)強度已經減(jian)少，盡快放電(dian)(dian)，消除(chu)干(gan)擾才是(shi)(shi)內層(ceng)(ceng)(ceng)的(de)目(mu)的(de)。外(wai)(wai)部(bu)(bu)電(dian)(dian)擊和(he)防(fang)雷等***要(yao)求。這種(zhong)情況(kuang)***要(yao)兩層(ceng)(ceng)(ceng)防(fang)護(hu)，外(wai)(wai)層(ceng)(ceng)(ceng)不是(shi)(shi)用來消除(chu)干(gan)擾的(de)，是(shi)(shi)出于***考慮的(de)，保證人(ren)身(shen)和(he)設備(bei)***，***多(duo)點(dian)(dian)接(jie)(jie)地(di)。內層(ceng)(ceng)(ceng)才是(shi)(shi)防(fang)止干(gan)擾的(de)，所以***單(dan)點(dian)(dian)接(jie)(jie)地(di)。

屏(ping)蔽(bi)(bi)(bi)(bi)線(xian)(xian)是(shi)使用金屬網狀編織層(ceng)(ceng)(ceng)(ceng)把信(xin)(xin)號(hao)線(xian)(xian)包(bao)裹起(qi)來的(de)傳輸線(xian)(xian)，編織層(ceng)(ceng)(ceng)(ceng)一(yi)般是(shi)紅銅(tong)或者鍍錫銅(tong)。屏(ping)蔽(bi)(bi)(bi)(bi)線(xian)(xian)是(shi)為減少外(wai)電(dian)(dian)磁(ci)場(chang)對電(dian)(dian)源或通(tong)信(xin)(xin)線(xian)(xian)路的(de)影(ying)響，而(er)專門采用的(de)一(yi)種帶金屬編織物外(wai)殼的(de)導(dao)線(xian)(xian)。這(zhe)種屏(ping)蔽(bi)(bi)(bi)(bi)線(xian)(xian)也有防止線(xian)(xian)路向外(wai)輻射(she)電(dian)(dian)磁(ci)能的(de)作用。屏(ping)蔽(bi)(bi)(bi)(bi)層(ceng)(ceng)(ceng)(ceng)需要(yao)(yao)接(jie)(jie)地(di)(di)(di)，外(wai)來的(de)干擾信(xin)(xin)號(hao)可(ke)被該層(ceng)(ceng)(ceng)(ceng)導(dao)入大地(di)(di)(di)。屏(ping)蔽(bi)(bi)(bi)(bi)電(dian)(dian)纜(lan)的(de)屏(ping)蔽(bi)(bi)(bi)(bi)層(ceng)(ceng)(ceng)(ceng)主要(yao)(yao)由(you)銅(tong)、鋁(lv)等非磁(ci)性(xing)材料制成，并且厚度很薄，遠小于(yu)使用頻率上金屬材料的(de)集膚深度（所(suo)謂趨膚效(xiao)應是(shi)指(zhi)電(dian)(dian)流(liu)在導(dao)體(ti)(ti)截面的(de)分布隨頻率的(de)升(sheng)高(gao)(gao)而(er)趨于(yu)導(dao)體(ti)(ti)表面分布，頻率越高(gao)(gao)，趨膚深度越小，即頻率越高(gao)(gao)，電(dian)(dian)磁(ci)波的(de)穿透(tou)能力越弱），屏(ping)蔽(bi)(bi)(bi)(bi)層(ceng)(ceng)(ceng)(ceng)的(de)效(xiao)果(guo)主要(yao)(yao)不(bu)是(shi)由(you)于(yu)金屬體(ti)(ti)本身對電(dian)(dian)場(chang)、磁(ci)場(chang)的(de)反射(she)、吸收而(er)產生(sheng)的(de)，而(er)是(shi)由(you)于(yu)屏(ping)蔽(bi)(bi)(bi)(bi)層(ceng)(ceng)(ceng)(ceng)的(de)接(jie)(jie)地(di)(di)(di)產生(sheng)的(de)，接(jie)(jie)地(di)(di)(di)的(de)形(xing)式不(bu)同將(jiang)直(zhi)接(jie)(jie)影(ying)響屏(ping)蔽(bi)(bi)(bi)(bi)效(xiao)果(guo)結構(gou)包(bao)裹的(de)導(dao)體(ti)(ti)叫屏(ping)蔽(bi)(bi)(bi)(bi)層(ceng)(ceng)(ceng)(ceng)，一(yi)般為導(dao)電(dian)(dian)布，編織銅(tong)網或銅(tong)（鋁(lv)）鉑。普通(tong)：絕緣層(ceng)(ceng)(ceng)(ceng)+屏(ping)蔽(bi)(bi)(bi)(bi)層(ceng)(ceng)(ceng)(ceng)+導(dao)線(xian)(xian)。

：絕(jue)緣(yuan)層(ceng)(ceng)(ceng)+屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)(ceng)+信(xin)號導(dao)線(xian)(xian)+屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)(ceng)接地(di)導(dao)線(xian)(xian)。屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)(ceng)一般需(xu)要接地(di)。屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)線(xian)(xian)的(de)(de)(de)(de)作(zuo)(zuo)用(yong)(yong)是(shi)將電磁場噪(zao)(zao)(zao)聲源(yuan)與(yu)敏(min)感(gan)設(she)(she)備(bei)隔離，切斷(duan)噪(zao)(zao)(zao)聲源(yuan)的(de)(de)(de)(de)傳播路(lu)徑(jing)。屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)分為(wei)主動(dong)屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)和被動(dong)屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)，主動(dong)屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)目的(de)(de)(de)(de)是(shi)為(wei)了防止(zhi)噪(zao)(zao)(zao)聲源(yuan)向外輻射，是(shi)對(dui)噪(zao)(zao)(zao)聲源(yuan)的(de)(de)(de)(de)屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)；被動(dong)屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)目的(de)(de)(de)(de)是(shi)為(wei)了防止(zhi)敏(min)感(gan)設(she)(she)備(bei)遭到噪(zao)(zao)(zao)聲源(yuan)的(de)(de)(de)(de)干(gan)擾，是(shi)對(dui)敏(min)感(gan)設(she)(she)備(bei)的(de)(de)(de)(de)屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)。屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)線(xian)(xian)的(de)(de)(de)(de)屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)(ceng)不(bu)允許多點接地(di)，因為(wei)不(bu)同(tong)的(de)(de)(de)(de)接地(di)點總是(shi)不(bu)一樣的(de)(de)(de)(de)，各點存在(zai)電位差。如多點接地(di)，在(zai)屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)(ceng)形成電流(liu)，不(bu)但起不(bu)到屏(ping)(ping)(ping)(ping)蔽(bi)(bi)(bi)作(zuo)(zuo)用(yong)(yong)，反而引進干(gan)擾，尤其(qi)在(zai)變頻(pin)器用(yong)(yong)的(de)(de)(de)(de)多的(de)(de)(de)(de)場合里，干(gan)擾中含有各種高次(ci)諧波分量，造成影響(xiang)更大，應特別注意。

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