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       在(zai)(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)結構上的(de)(de)(de)(de)(de)(de)(de)(de)(de)所謂(wei)“屏(ping)(ping)(ping)蔽(bi)(bi)(bi)”，實質上是一種改(gai)善電(dian)(dian)(dian)(dian)(dian)(dian)場分布的(de)(de)(de)(de)(de)(de)(de)(de)(de)措施。電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)導(dao)體(ti)由多根導(dao)線絞合而(er)成，它與(yu)絕(jue)(jue)緣(yuan)(yuan)層(ceng)(ceng)之(zhi)間易形成氣隙，導(dao)體(ti)表面(mian)不光滑(hua)，會造(zao)成電(dian)(dian)(dian)(dian)(dian)(dian)場集 中。在(zai)(zai)(zai)導(dao)體(ti)表面(mian)加一層(ceng)(ceng)半導(dao)電(dian)(dian)(dian)(dian)(dian)(dian)材料的(de)(de)(de)(de)(de)(de)(de)(de)(de)屏(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)，它與(yu)被屏(ping)(ping)(ping)蔽(bi)(bi)(bi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)導(dao)體(ti)等電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)并與(yu)絕(jue)(jue)緣(yuan)(yuan)層(ceng)(ceng)良好接(jie)觸，從(cong)而(er)避免(mian)在(zai)(zai)(zai)導(dao)體(ti)與(yu)絕(jue)(jue)緣(yuan)(yuan)層(ceng)(ceng)之(zhi)間發(fa)生(sheng)局(ju)部(bu)放電(dian)(dian)(dian)(dian)(dian)(dian)，這(zhe)一層(ceng)(ceng)屏(ping)(ping)(ping)蔽(bi)(bi)(bi)為內屏(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)； 同樣(yang)在(zai)(zai)(zai)絕(jue)(jue)緣(yuan)(yuan)表面(mian)和護套接(jie)觸處也(ye)可能存(cun)在(zai)(zai)(zai)間隙，是引起(qi)(qi)局(ju)部(bu)放電(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)因素，故在(zai)(zai)(zai)絕(jue)(jue)緣(yuan)(yuan)層(ceng)(ceng)表面(mian)加一層(ceng)(ceng)半導(dao)電(dian)(dian)(dian)(dian)(dian)(dian)材料的(de)(de)(de)(de)(de)(de)(de)(de)(de)屏(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)，它與(yu)被屏(ping)(ping)(ping)蔽(bi)(bi)(bi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)絕(jue)(jue)緣(yuan)(yuan)層(ceng)(ceng)有良好接(jie)觸，與(yu)金(jin)屬(shu)護套 等電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)，從(cong)而(er)避免(mian)在(zai)(zai)(zai)絕(jue)(jue)緣(yuan)(yuan)層(ceng)(ceng)與(yu)護套之(zhi)間發(fa)生(sheng)局(ju)部(bu)放電(dian)(dian)(dian)(dian)(dian)(dian)，這(zhe)一層(ceng)(ceng)屏(ping)(ping)(ping)蔽(bi)(bi)(bi)為外(wai)屏(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)；沒有金(jin)屬(shu)護套的(de)(de)(de)(de)(de)(de)(de)(de)(de)擠(ji)包(bao)絕(jue)(jue)緣(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)，除半導(dao)電(dian)(dian)(dian)(dian)(dian)(dian)屏(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)外(wai)，還要增加用(yong)銅(tong)帶(dai)或(huo)銅(tong)絲繞包(bao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)金(jin) 屬(shu)屏(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)，這(zhe)個(ge)金(jin)屬(shu)屏(ping)(ping)(ping)蔽(bi)(bi)(bi)層(ceng)(ceng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)作(zuo)(zuo)用(yong)，在(zai)(zai)(zai)正常運行時(shi)通(tong)過電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)電(dian)(dian)(dian)(dian)(dian)(dian)流；當系統發(fa)生(sheng)短(duan)路時(shi)，作(zuo)(zuo)為短(duan)路電(dian)(dian)(dian)(dian)(dian)(dian)流的(de)(de)(de)(de)(de)(de)(de)(de)(de)通(tong)道(dao)，同時(shi)也(ye)起(qi)(qi)到(dao)屏(ping)(ping)(ping)蔽(bi)(bi)(bi)電(dian)(dian)(dian)(dian)(dian)(dian)場的(de)(de)(de)(de)(de)(de)(de)(de)(de)作(zuo)(zuo)用(yong)。可見，如(ru)果電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)中這(zhe)層(ceng)(ceng)外(wai) 半導(dao)體(ti)層(ceng)(ceng)和銅(tong)屏(ping)(ping)(ping)蔽(bi)(bi)(bi)不存(cun)在(zai)(zai)(zai)，三芯(xin)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)中芯(xin)與(yu)芯(xin)之(zhi)間發(fa)生(sheng)絕(jue)(jue)緣(yuan)(yuan)擊穿的(de)(de)(de)(de)(de)(de)(de)(de)(de)可能性非常大。