利用(yong)供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)安裝(zhuang)(zhuang)高(gao)(gao)度形成的(de)(de)(de)(de)(de)(de)(de)(de)自然(ran)壓(ya)力(li)(li)來維(wei)持充油(you)(you)(you)(you)(you)(you)(you)(you)電(dian)(dian)(dian)(dian)(dian)纜(lan)油(you)(you)(you)(you)(you)(you)(you)(you)壓(ya)的(de)(de)(de)(de)(de)(de)(de)(de)供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)裝(zhuang)(zhuang)置為重(zhong)力(li)(li)供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)。它的(de)(de)(de)(de)(de)(de)(de)(de)特點(dian)是供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)壓(ya)力(li)(li)與(yu)(yu)供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)吞吐量(liang)的(de)(de)(de)(de)(de)(de)(de)(de)大小和環境溫(wen)(wen)度無關(guan)，電(dian)(dian)(dian)(dian)(dian)纜(lan)內部(bu)(bu)各處(chu)(chu)的(de)(de)(de)(de)(de)(de)(de)(de)油(you)(you)(you)(you)(you)(you)(you)(you)壓(ya)僅與(yu)(yu)供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)中(zhong)的(de)(de)(de)(de)(de)(de)(de)(de)油(you)(you)(you)(you)(you)(you)(you)(you)位與(yu)(yu)該處(chu)(chu)高(gao)(gao)差有關(guan)。重(zhong)力(li)(li)供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)結(jie)構(gou)如圖2- 10所示。油(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)內的(de)(de)(de)(de)(de)(de)(de)(de)主要部(bu)(bu)件(jian)(jian)是一(yi)組具有彈(dan)(dan)性(xing)(xing)的(de)(de)(de)(de)(de)(de)(de)(de)元(yuan)(yuan)件(jian)(jian)，彈(dan)(dan)性(xing)(xing)元(yuan)(yuan)件(jian)(jian)2由兩片金屬波(bo)紋薄板焊接而(er)成，通過分支油(you)(you)(you)(you)(you)(you)(you)(you)管(guan)6與(yu)(yu)總油(you)(you)(you)(you)(you)(you)(you)(you)管(guan)5相連。彈(dan)(dan)性(xing)(xing)元(yuan)(yuan)件(jian)(jian)2內充滿與(yu)(yu)電(dian)(dian)(dian)(dian)(dian)纜(lan)油(you)(you)(you)(you)(you)(you)(you)(you)道(dao)(dao)相通的(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)纜(lan)油(you)(you)(you)(you)(you)(you)(you)(you)7，彈(dan)(dan)性(xing)(xing)元(yuan)(yuan)件(jian)(jian)外(wai)(wai)面(mian)的(de)(de)(de)(de)(de)(de)(de)(de)保護(hu)油(you)(you)(you)(you)(you)(you)(you)(you)與(yu)(yu)電(dian)(dian)(dian)(dian)(dian)纜(lan)油(you)(you)(you)(you)(you)(you)(you)(you)道(dao)(dao)隔絕而(er)與(yu)(yu)大氣(qi)相通。當電(dian)(dian)(dian)(dian)(dian)纜(lan)溫(wen)(wen)度升(sheng)高(gao)(gao)，電(dian)(dian)(dian)(dian)(dian)纜(lan)內浸(jin)漬(zi)劑(ji)體積(ji)(ji)膨脹，多余的(de)(de)(de)(de)(de)(de)(de)(de)浸(jin)漬(zi)劑(ji)經電(dian)(dian)(dian)(dian)(dian)纜(lan)油(you)(you)(you)(you)(you)(you)(you)(you)道(dao)(dao)被壓(ya)送(song)到彈(dan)(dan)性(xing)(xing)元(yuan)(yuan)件(jian)(jian)內，使得彈(dan)(dan)性(xing)(xing)元(yuan)(yuan)件(jian)(jian)的(de)(de)(de)(de)(de)(de)(de)(de)體積(ji)(ji)增大，彈(dan)(dan)性(xing)(xing)元(yuan)(yuan)件(jian)(jian)外(wai)(wai)部(bu)(bu)的(de)(de)(de)(de)(de)(de)(de)(de)油(you)(you)(you)(you)(you)(you)(you)(you)(保護(hu)油(you)(you)(you)(you)(you)(you)(you)(you)1)面(mian)隨之升(sheng)高(gao)(gao)。反之，電(dian)(dian)(dian)(dian)(dian)纜(lan)溫(wen)(wen)度下(xia)降，浸(jin)漬(zi)劑(ji)體積(ji)(ji)收縮，彈(dan)(dan)性(xing)(xing)元(yuan)(yuan)件(jian)(jian)中(zhong)的(de)(de)(de)(de)(de)(de)(de)(de)油(you)(you)(you)(you)(you)(you)(you)(you)在(zai)重(zhong)力(li)(li)作用(yong)下(xia)流回到電(dian)(dian)(dian)(dian)(dian)纜(lan)絕緣層內，使浸(jin)漬(zi)劑(ji)得到補(bu)充，從而(er)消除(chu)了氣(qi)隙(xi)的(de)(de)(de)(de)(de)(de)(de)(de)形成。這種供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)的(de)(de)(de)(de)(de)(de)(de)(de)優點(dian)是壓(ya)力(li)(li)變(bian)化平坦、結(jie)構(gou)簡(jian)單、維(wei)護(hu)方便;缺(que)點(dian)是體積(ji)(ji)較大，需要安裝(zhuang)(zhuang)在(zai)一(yi)定的(de)(de)(de)(de)(de)(de)(de)(de)高(gao)(gao)度(線路(lu)的(de)(de)(de)(de)(de)(de)(de)(de)*高(gao)(gao)處(chu)(chu)的(de)(de)(de)(de)(de)(de)(de)(de)終端)及有可利用(yong)的(de)(de)(de)(de)(de)(de)(de)(de)高(gao)(gao)建筑構(gou)架放置重(zhong)力(li)(li)箱(xiang)(xiang)(xiang)才(cai)能保持電(dian)(dian)(dian)(dian)(dian)纜(lan)所需要的(de)(de)(de)(de)(de)(de)(de)(de)油(you)(you)(you)(you)(you)(you)(you)(you)壓(ya)范圍，需油(you)(you)(you)(you)(you)(you)(you)(you)量(liang)大(彈(dan)(dan)性(xing)(xing)元(yuan)(yuan)件(jian)(jian)外(wai)(wai)的(de)(de)(de)(de)(de)(de)(de)(de)油(you)(you)(you)(you)(you)(you)(you)(you)量(liang)要比伸(shen)縮元(yuan)(yuan)件(jian)(jian)內的(de)(de)(de)(de)(de)(de)(de)(de)油(you)(you)(you)(you)(you)(you)(you)(you)量(liang)多一(yi)倍以上)，線路(lu)較短(通常為1000~ 2000m)。重(zhong)力(li)(li)箱(xiang)(xiang)(xiang)一(yi)端供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)的(de)(de)(de)(de)(de)(de)(de)(de)特點(dian)如下(xia):(1)供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)段的(de)(de)(de)(de)(de)(de)(de)(de)長(chang)度較長(chang);(2)油(you)(you)(you)(you)(you)(you)(you)(you)壓(ya)穩定，壓(ya)力(li)(li)變(bian)化比較平坦;(3)即使電(dian)(dian)(dian)(dian)(dian)纜(lan)線路(lu)有落差，重(zhong)力(li)(li)箱(xiang)(xiang)(xiang)供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)容(rong)量(liang)也不變(bian)化;(4)對傾斜(xie)的(de)(de)(de)(de)(de)(de)(de)(de)線路(lu)供(gong)(gong)(gong)(gong)(gong)油(you)(you)(you)(you)(you)(you)(you)(you)段可延長(chang)。