電力電纜的屏蔽層的作用介紹

 屏蔽層為了均勻導電線芯和絕緣電場，6kV及以上的中高壓電力電纜一般都有導體屏蔽層和絕緣屏蔽層
，部分低壓電纜不設置屏蔽層。屏蔽層有半導電屏蔽和金屬屏蔽兩種。
 

（1）半導電屏蔽   半(ban)導(dao)電(dian)屏(ping)蔽(bi)層(ceng)通(tong)常(chang)設(she)置(zhi)在(zai)導(dao)電(dian)線(xian)芯(xin)的(de)外(wai)表(biao)麵(mian)和(he)絕(jue)緣(yuan)層(ceng)的(de)外(wai)表(biao)麵(mian)，分(fen)別(bie)稱(cheng)為(wei)內(nei)半(ban)導(dao)電(dian)屏(ping)蔽(bi)層(ceng)和(he)外(wai)半(ban)導(dao)電(dian)屏(ping)蔽(bi)層(ceng)。半(ban)導(dao)電(dian)屏(ping)蔽(bi)層(ceng)是(shi)由(you)電(dian)阻(zu)率(lv)很(hen)低(di)且(qie)厚(hou)度(du)較(jiao)薄(bo)的(de)半(ban)導(dao)電(dian)材(cai)料(liao)構(gou)成(cheng)。內(nei)半(ban)導(dao)電(dian)屏(ping)蔽(bi)層(ceng)是(shi)為(wei)了(le)均(jun)勻(yun)線(xian)芯(xin)外(wai)表(biao)麵(mian)電(dian)場(chang)，避(bi)免(mian)因(yin)導(dao)體(ti)表(biao)麵(mian)不(bu)光(guang)滑(hua)以(yi)及(ji)線(xian)芯(xin)絞(jiao)合(he)產(chan)生(sheng)的(de)氣(qi)隙(xi)而(er)造(zao)成(cheng)導(dao)體(ti)和(he)絕(jue)緣(yuan)發(fa)生(sheng)局(ju)部(bu)放(fang)電(dian)。外(wai)半(ban)導(dao)電(dian)屏(ping)蔽(bi)層(ceng)與(yu)絕(jue)緣(yuan)層(ceng)外(wai)表(biao)麵(mian)接(jie)觸(chu)很(hen)好(hao)，且(qie)與(yu)金(jin)屬(shu)護(hu)套(tao)等(deng)電(dian)位(wei)
，避(bi)免(mian)因(yin)電(dian)纜(lan)絕(jue)緣(yuan)表(biao)麵(mian)裂(lie)紋(wen)等(deng)缺(que)陷(xian)而(er)與(yu)金(jin)屬(shu)護(hu)套(tao)發(fa)生(sheng)局(ju)部(bu)放(fang)電(dian)。
 

（2）金屬屏蔽   duiyumeiyoujinshuhutaodezhongdiyadianlidianlan，chuleshezhiyoubandaodianpingbicengwai，haiyaozengjiajinshupingbiceng。jinshupingbicengtongchangyoutongdaihuotongsiraobaoercheng，zhuyaoqidaopingbidianchangdezuoyong。