變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)可用(yong)(yong)(yong)汽車吊直接甩(shuai)進變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)室內，或用(yong)(yong)(yong)道(dao)(dao)木搭設臨(lin)時軌道(dao)(dao)，用(yong)(yong)(yong)三步搭、吊鏈吊至臨(lin)時軌道(dao)(dao)上(shang)，然后用(yong)(yong)(yong)吊鏈拉入室內合適位置。變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)應注意其方位和距(ju)墻尺寸與圖紙(zhi)相符，允許誤差為(wei)±25mm，圖紙(zhi)無標注時，橫向(xiang)距(ju)墻不(bu)(bu)得(de)小于(yu)800mm，距(ju)門(men)不(bu)(bu)得(de)小于(yu)1000mm。變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)臺架的安裝(zhuang)：雙桿柱上(shang)安裝(zhuang)變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)，兩(liang)桿的根開為(wei)2m。埋深2m。配(pei)電變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)臺架用(yong)(yong)(yong)兩(liang)條或四(si)條槽鋼固定于(yu)兩(liang)電桿上(shang)，臺架距(ju)地面(mian)高度不(bu)(bu)低于(yu)2.5m，臺架的平面(mian)坡度不(bu)(bu)大于(yu)1/100。腰欄應采用(yong)(yong)(yong)直徑(jing)不(bu)(bu)小于(yu)4mm的鐵線(xian)纏繞兩(liang)圈以上(shang)，纏繞應緊牢，腰欄距(ju)帶電部分不(bu)(bu)少(shao)于(yu)0.2m。同時變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)高壓(ya)(ya)(ya)柱頭加裝(zhuang)防塵罩，變(bian)壓(ya)(ya)(ya)器(qi)(qi)(qi)懸掛警告牌。

　　跌落式熔斷器的安裝

　　變(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)(de)高(gao)(gao)、低(di)壓(ya)(ya)(ya)(ya)側(ce)(ce)(ce)應分別(bie)裝設(she)熔(rong)(rong)斷(duan)器(qi)(qi)(qi)。高(gao)(gao)壓(ya)(ya)(ya)(ya)側(ce)(ce)(ce)熔(rong)(rong)斷(duan)器(qi)(qi)(qi)的(de)(de)(de)底(di)部(bu)對地(di)面的(de)(de)(de)垂直(zhi)高(gao)(gao)度不低(di)于(yu)(yu)(yu)4.5m，各相熔(rong)(rong)斷(duan)器(qi)(qi)(qi)的(de)(de)(de)水平(ping)距離(li)不應小于(yu)(yu)(yu)0.5m，為了(le)便于(yu)(yu)(yu)操作和熔(rong)(rong)絲(si)(si)(si)熔(rong)(rong)斷(duan)后熔(rong)(rong)絲(si)(si)(si)管(guan)(guan)能順利地(di)跌(die)(die)(die)落(luo)下來(lai)，跌(die)(die)(die)落(luo)式熔(rong)(rong)斷(duan)器(qi)(qi)(qi)的(de)(de)(de)軸線(xian)應與垂直(zhi)線(xian)成15°～30°傾(qing)角。低(di)壓(ya)(ya)(ya)(ya)側(ce)(ce)(ce)熔(rong)(rong)斷(duan)器(qi)(qi)(qi)的(de)(de)(de)底(di)部(bu)對地(di)面的(de)(de)(de)垂直(zhi)距離(li)不低(di)于(yu)(yu)(yu)5m，各相熔(rong)(rong)斷(duan)器(qi)(qi)(qi)的(de)(de)(de)水平(ping)距離(li)不少于(yu)(yu)(yu)0.2m。跌(die)(die)(die)落(luo)式熔(rong)(rong)斷(duan)器(qi)(qi)(qi)熔(rong)(rong)絲(si)(si)(si)的(de)(de)(de)選擇(ze)(ze)按(an)“保證配電(dian)變(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)內部(bu)或高(gao)(gao)、低(di)壓(ya)(ya)(ya)(ya)出線(xian)套(tao)管(guan)(guan)發(fa)生短(duan)路(lu)時迅速熔(rong)(rong)斷(duan)”的(de)(de)(de)原則(ze)來(lai)選擇(ze)(ze)，熔(rong)(rong)絲(si)(si)(si)的(de)(de)(de)熔(rong)(rong)斷(duan)時間小于(yu)(yu)(yu)或等(deng)于(yu)(yu)(yu)0.1s。按(an)規程規定(ding)：容量在100kVA及(ji)以下者，高(gao)(gao)壓(ya)(ya)(ya)(ya)側(ce)(ce)(ce)熔(rong)(rong)絲(si)(si)(si)額定(ding)電(dian)流(liu)(liu)按(an)變(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)容量額定(ding)電(dian)流(liu)(liu)的(de)(de)(de)2～3倍選擇(ze)(ze)；容量在100kVA以上者，高(gao)(gao)壓(ya)(ya)(ya)(ya)側(ce)(ce)(ce)熔(rong)(rong)絲(si)(si)(si)額定(ding)電(dian)流(liu)(liu)按(an)變(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)容量額定(ding)電(dian)流(liu)(liu)的(de)(de)(de)1.5～2倍選擇(ze)(ze)。變(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)低(di)壓(ya)(ya)(ya)(ya)側(ce)(ce)(ce)熔(rong)(rong)絲(si)(si)(si)按(an)低(di)壓(ya)(ya)(ya)(ya)側(ce)(ce)(ce)額定(ding)電(dian)流(liu)(liu)選擇(ze)(ze)。

　　避雷器的安裝

　　選用(yong)無間隙合成絕(jue)緣外(wai)套金(jin)屬氧(yang)化物避(bi)雷器(qi)。避(bi)雷器(qi)應裝設在熔斷器(qi)與變壓(ya)(ya)(ya)器(qi)之間，并盡量(liang)靠近變壓(ya)(ya)(ya)器(qi)。另外(wai)，為了(le)防止反(fan)變換波和(he)低壓(ya)(ya)(ya)側雷電波侵入(ru)，在低壓(ya)(ya)(ya)側也應裝設低壓(ya)(ya)(ya)避(bi)雷器(qi)。為避(bi)免(mian)雷電流在接(jie)地(di)電阻(zu)上的(de)壓(ya)(ya)(ya)降與避(bi)雷器(qi)的(de)殘(can)壓(ya)(ya)(ya)疊加在一起(qi)，作用(yong)在變壓(ya)(ya)(ya)器(qi)絕(jue)緣上，應將避(bi)雷器(qi)的(de)接(jie)地(di)端(duan)、變壓(ya)(ya)(ya)器(qi)的(de)外(wai)殼及低壓(ya)(ya)(ya)側中性點用(yong)截面不小(xiao)于25mm2的(de)多股銅芯(xin)塑料線(xian)(xian)連(lian)接(jie)在一起(qi)，再與接(jie)地(di)裝置(zhi)引上線(xian)(xian)相連(lian)接(jie)。

　　接地裝置

　　對(dui)10kV配電(dian)變(bian)壓(ya)(ya)器(qi)：容量在(zai)(zai)(zai)100kVA以(yi)(yi)(yi)下，其接(jie)地(di)(di)(di)(di)(di)(di)電(dian)阻(zu)不應大于10Ω；容量在(zai)(zai)(zai)100kVA以(yi)(yi)(yi)上(shang)，其接(jie)地(di)(di)(di)(di)(di)(di)電(dian)阻(zu)不應大于4Ω。接(jie)地(di)(di)(di)(di)(di)(di)裝置(zhi)施(shi)工完畢應進行接(jie)地(di)(di)(di)(di)(di)(di)電(dian)阻(zu)測試，合格后(hou)方可回填土。同時，變(bian)壓(ya)(ya)器(qi)外(wai)殼良(liang)好接(jie)地(di)(di)(di)(di)(di)(di)，外(wai)殼接(jie)地(di)(di)(di)(di)(di)(di)應用(yong)(yong)螺栓擰緊，不可用(yong)(yong)焊(han)接(jie)直(zhi)接(jie)焊(han)牢，以(yi)(yi)(yi)便檢修。接(jie)地(di)(di)(di)(di)(di)(di)裝置(zhi)的地(di)(di)(di)(di)(di)(di)下部分由水平接(jie)地(di)(di)(di)(di)(di)(di)體(ti)和(he)垂(chui)直(zhi)接(jie)地(di)(di)(di)(di)(di)(di)體(ti)組成，水平接(jie)地(di)(di)(di)(di)(di)(di)體(ti)采(cai)用(yong)(yong)6根(gen)(gen)長度為(wei)(wei)6m的40×4mm的扁(bian)鋼(gang)，垂(chui)直(zhi)接(jie)地(di)(di)(di)(di)(di)(di)體(ti)則(ze)采(cai)用(yong)(yong)10-6根(gen)(gen)長度為(wei)(wei)2m的L50×50×5mm的角(jiao)鋼(gang)分別與水平接(jie)地(di)(di)(di)(di)(di)(di)體(ti)焊(han)接(jie)。水平接(jie)地(di)(di)(di)(di)(di)(di)體(ti)在(zai)(zai)(zai)土壤中埋設深(shen)為(wei)(wei)0.6～0.8m，垂(chui)直(zhi)接(jie)地(di)(di)(di)(di)(di)(di)體(ti)則(ze)是(shi)在(zai)(zai)(zai)水平接(jie)地(di)(di)(di)(di)(di)(di)體(ti)基礎上(shang)打入地(di)(di)(di)(di)(di)(di)里的。接(jie)地(di)(di)(di)(di)(di)(di)引(yin)上(shang)線(xian)采(cai)用(yong)(yong)40×4mm扁(bian)鋼(gang)，為(wei)(wei)了檢測方便和(he)用(yong)(yong)電(dian)，對(dui)于柱上(shang)式安裝的變(bian)壓(ya)(ya)器(qi)，引(yin)上(shang)線(xian)連接(jie)點應設在(zai)(zai)(zai)變(bian)壓(ya)(ya)器(qi)底下的槽鋼(gang)位置(zhi)。

　　變臺引落線

　　新建(jian)和改造的變(bian)臺(tai)的引落線(xian)均(jun)應(ying)(ying)采用(yong)多股(gu)絕(jue)(jue)緣線(xian)，其(qi)截(jie)面(mian)應(ying)(ying)按變(bian)壓器的額定(ding)容量選擇，但(dan)高壓側引落線(xian)銅芯不應(ying)(ying)小于16mm2，鋁芯不應(ying)(ying)小于25mm2，杜(du)絕(jue)(jue)使用(yong)單(dan)股(gu)導線(xian)及不合格導線(xian)。同時應(ying)(ying)考慮引落線(xian)對周圍建(jian)筑物的距離。