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不(bu)(bu)(bu)同的(de)環(huan)境條件(jian)場合下(xia)，應(ying)考(kao)慮選擇不(bu)(bu)(bu)同類型和材(cai)料的(de)母(mu)線(xian)(xian)槽(cao)(cao), 此外(wai)，對各種母(mu)線(xian)(xian)槽(cao)(cao)，通(tong)常應(ying)按(an)*大長(chang)(chang)(chang)期工(gong)作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)選擇母(mu)線(xian)(xian)槽(cao)(cao)截(jie)面(mian)。并按(an)通(tong)過*大短(duan)路電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)條件(jian)下(xia)，校驗母(mu)線(xian)(xian)槽(cao)(cao)的(de)短(duan)時(shi)熱(re)(re)(re)穩(wen)(wen)定性和動穩(wen)(wen)定性。由(you)于(yu)導體(ti)存在電(dian)(dian)(dian)(dian)(dian)(dian)阻和多 導體(ti)接近時(shi)交流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)趨表效應(ying)等(deng)因素影響，母(mu)線(xian)(xian)槽(cao)(cao)通(tong)過電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)時(shi)會引起發熱(re)(re)(re)。銅、鋁質(zhi)裸母(mu)線(xian)(xian)槽(cao)(cao)長(chang)(chang)(chang)期工(gong)作(zuo)時(shi)的(de)發熱(re)(re)(re)允許(xu)溫度均(jun)為70 ℃，但當其接觸面(mian)處(chu)具有(you)錫的(de)可靠覆蓋居時(shi)(如超聲波搪(tang)錫等(deng))，則(ze)允許(xu)溫度提高(gao)到(dao)85℃。受此持續發熱(re)(re)(re)允許(xu)溫度的(de)限制，不(bu)(bu)(bu)同材(cai)料、截(jie)面(mian)的(de)母(mu)線(xian)(xian)槽(cao)(cao)給(gei)出(chu)了相(xiang)應(ying)的(de) 長(chang)(chang)(chang)期允許(xu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)值，選擇母(mu)線(xian)(xian)槽(cao)(cao)截(jie)面(mian)時(shi)，應(ying)使母(mu)線(xian)(xian)槽(cao)(cao)實(shi)際(ji)的(de)*大長(chang)(chang)(chang)期工(gong)作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(計及半小(xiao)(xiao)時(shi)以(yi)上的(de)過負(fu)菏)小(xiao)(xiao)于(yu)所選截(jie)面(mian)母(mu)線(xian)(xian)槽(cao)(cao)的(de)長(chang)(chang)(chang)期允許(xu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)值。在年均(jun)負(fu)荷(he)較大、 導體(ti)和母(mu)線(xian)(xian)槽(cao)(cao)校長(chang)(chang)(chang)的(de)情況下(xia)(如屋外(wai)配(pei)電(dian)(dian)(dian)(dian)(dian)(dian)裝置母(mu)線(xian)(xian)槽(cao)(cao))，通(tong)常按(an)經(jing)濟(ji)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)密(mi)度法選擇母(mu)線(xian)(xian)槽(cao)(cao)。經(jing)濟(ji)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)密(mi)度是綜合考(kao)慮母(mu)線(xian)(xian)槽(cao)(cao)損耗、母(mu)線(xian)(xian)槽(cao)(cao)和附屬設備的(de)年維修費(fei)與 折舊(jiu)費(fei)為*低情況下(xia)，此時(shi)母(mu)線(xian)(xian)槽(cao)(cao)單(dan)位截(jie)面(mian)積流(liu)過的(de)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)。用經(jing)濟(ji)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)密(mi)度除以(yi)不(bu)(bu)(bu)計入過負(fu)荷(he)的(de)長(chang)(chang)(chang)期工(gong)作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)即得母(mu)線(xian)(xian)槽(cao)(cao)截(jie)面(mian)。由(you)經(jing)濟(ji)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)密(mi)度法選擇的(de)母(mu)線(xian)(xian)槽(cao)(cao)截(jie) 面(mian)，一般比按(an)*大長(chang)(chang)(chang)期工(gong)作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)選撐的(de)母(mu)線(xian)(xian)槽(cao)(cao)截(jie)面(mian)要大些(xie)。母(mu)線(xian)(xian)槽(cao)(cao)要求要更高(gao)一些(xie)。
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