一、絕緣子串的作用是什么
絕(jue)緣(yuan)子(zi)串(chuan)(chuan)指兩(liang)個或多個絕(jue)緣(yuan)子(zi)元件組合在一起,柔性懸掛導(dao)(dao)線的組件。絕(jue)緣(yuan)子(zi)串(chuan)(chuan)是(shi)(shi)帶(dai)有固定和(he)運(yun)行(xing)需要的保護裝置,用(yong)于懸掛導(dao)(dao)線并使導(dao)(dao)線與桿塔和(he)大地絕(jue)緣(yuan),那么絕(jue)緣(yuan)子(zi)串(chuan)(chuan)的作用(yong)是(shi)(shi)什么呢?
絕緣子串起著隔(ge)離作用(yong),其實不(bu)是(shi)有(you)絕緣(yuan)的(de)作用(yong),主(zhu)要是(shi)防止(zhi)接地不(bu)合格的(de)情況下感應電傷人。
二、絕緣子串和電壓的關系是什么
在交流(liu)電(dian)(dian)(dian)壓(ya)作用下的(de)(de)絕(jue)緣子(zi)串,無論其(qi)片數多少,其(qi)分(fen)(fen)布(bu)電(dian)(dian)(dian)壓(ya)(絕(jue)緣子(zi)串在系統運(yun)行相電(dian)(dian)(dian)壓(ya)下,每一片絕(jue)緣子(zi)所承受到的(de)(de)電(dian)(dian)(dian)壓(ya))曲線(xian)都具相同的(de)(de)特征:電(dian)(dian)(dian)壓(ya)分(fen)(fen)布(bu)曲線(xian)呈兩端(duan)高、中(zhong)(zhong)間低的(de)(de)馬鞍形(xing)。這是由于絕(jue)緣子(zi)的(de)(de)自身電(dian)(dian)(dian)容(rong)C以及(ji)對(dui)導線(xian)雜散電(dian)(dian)(dian)容(rong)C1、對(dui)地的(de)(de)雜散電(dian)(dian)(dian)容(rong)Ce所致(zhi)。從(cong)分(fen)(fen)布(bu)電(dian)(dian)(dian)壓(ya)值中(zhong)(zhong)可以看出,靠近(jin)導線(xian)側的(de)(de)數片絕(jue)緣子(zi)所承受的(de)(de)電(dian)(dian)(dian)壓(ya)較(jiao)高,電(dian)(dian)(dian)場(chang)強度較(jiao)大。
絕緣(yuan)(yuan)(yuan)(yuan)(yuan)子(zi)(zi)串電壓(ya)(ya)(ya)分(fen)布(bu)規(gui)律:由(you)于每個絕緣(yuan)(yuan)(yuan)(yuan)(yuan)子(zi)(zi)的(de)金屬部分(fen)與桿(gan)塔(ta)(地)間、導線(xian)間均存在雜散(san)電容,絕緣(yuan)(yuan)(yuan)(yuan)(yuan)子(zi)(zi)串中每個絕緣(yuan)(yuan)(yuan)(yuan)(yuan)子(zi)(zi)實(shi)際所(suo)分(fen)擔(dan)的(de)電壓(ya)(ya)(ya)并不(bu)相同。沿絕緣(yuan)(yuan)(yuan)(yuan)(yuan)子(zi)(zi)串的(de)電壓(ya)(ya)(ya)分(fen)布(bu)是極不(bu)均勻的(de),靠近導線(xian)的(de)絕緣(yuan)(yuan)(yuan)(yuan)(yuan)子(zi)(zi)電壓(ya)(ya)(ya)降最大(da),離導線(xian)愈(yu)(yu)遠的(de)絕緣(yuan)(yuan)(yuan)(yuan)(yuan)子(zi)(zi)兩(liang)端壓(ya)(ya)(ya)降愈(yu)(yu)小(xiao),當絕緣(yuan)(yuan)(yuan)(yuan)(yuan)子(zi)(zi)靠近桿(gan)塔(ta)橫擔(dan)時(shi),絕緣(yuan)(yuan)(yuan)(yuan)(yuan)子(zi)(zi)電壓(ya)(ya)(ya)降又(you)升高。絕緣(yuan)(yuan)(yuan)(yuan)(yuan)子(zi)(zi)串愈(yu)(yu)長,電壓(ya)(ya)(ya)分(fen)布(bu)愈(yu)(yu)不(bu)均勻,愈(yu)(yu)容易(yi)導致某些部位(wei)的(de)絕緣(yuan)(yuan)(yuan)(yuan)(yuan)損壞。