封(feng)閉母(mu)線(xian)槽(cao)具有(you)散(san)熱(re)好、阻(zu)抗低(di)及載(zai)流(liu)量(liang)大等(deng)等(deng)優(you)勢，與電(dian)纜相(xiang)比，在(zai)載(zai)流(liu)量(liang)相(xiang)同(tong)的情(qing)況(kuang)下(xia)，能節(jie)省(sheng)銅材(cai)10-35%，能減(jian)少(shao)電(dian)能損耗(hao)15%以上(shang)。封(feng)閉母(mu)線(xian)槽(cao)很(hen)適(shi)宜(yi)交(jiao)流(liu)電(dian)源，在(zai)給定的(de)電(dian)壓(ya)數值(zhi)下(xia)能維(wei)持(chi)住(zhu)長(chang)時段(duan)的運(yun)轉。壹分(fen)鐘(zhong)以內的交(jiao)流(liu)電(dian)狀態下(xia)，母線槽(cao)不(bu)會被(bei)擊(ji)穿且(qie)不(bu)會帶有(you)閃(shan)絡(luo)的狀態。它能承(cheng)載(zai)著的耐受電(dian)流(liu)、較短(duan)時(shi)段(duan)的峰(feng)值(zhi)電(dian)流(liu)，都會符合(he)規(gui)格。

Closed bus duct has advantages such as good heat dissipation, low impedance, and high current carrying capacity. Compared with cables, it can save copper materials by 10-35% and reduce electrical energy loss by more than 15% under the same current carrying capacity. Closed bus ducts are suitable for AC power sources and can maintain long-term operation at a given voltage value. Under the condition of alternating current within one minute, the bus duct will not be broken down and there will be no flashover. The withstand current it can carry and the peak current for a shorter period of time will meet the specifications.

1、封(feng)閉母(mu)線(xian)槽(cao)的使用(yong)壽(shou)命(ming)大約是(shi)電(dian)纜和分(fen)支電(dian)纜的(de)2～3倍左右(you)。我國(guo)香港、澳門及(ji)歐(ou)洲(zhou)有(you)些明確規(gui)定電(dian)纜使用(yong)壽(shou)命(ming)為12～15年。實(shi)際上(shang)母(mu)線(xian)槽(cao)的使用(yong)壽(shou)命(ming)則長(chang)達(da)30～50年。母線槽(cao)可分(fen)成空(kong)氣(qi)絕(jue)緣(yuan)類(lei)別(bie)、密(mi)集絕(jue)緣(yuan)類(lei)別(bie)。通(tong)常狀態下(xia)，空(kong)氣(qi)絕(jue)緣(yuan)這(zhe)樣的母(mu)線(xian)槽(cao)固(gu)有(you)的構(gou)架很(hen)簡易(yi)，密(mi)集絕(jue)緣(yuan)母(mu)線(xian)槽(cao)帶有(you)的散(san)熱(re)特性，電(dian)流(liu)等(deng)級(ji)很(hen)高(gao)。

1. The service life of enclosed bus ducts is approximately 2-3 times that of cables and branch cables. Hong Kong, Macau, and some European countries in China clearly stipulate that the service life of cables is 12-15 years. In fact, the service life of the bus duct is as long as 30-50 years. The bus duct can be divided into air insulation category and dense insulation category. Under normal conditions, the inherent structure of bus ducts with air insulation is very simple, and densely insulated bus ducts have high-quality heat dissipation characteristics and high current levels.

2、高(gao)層建築(zhu)布設(she)的電(dian)氣(qi)豎(shu)井，封(feng)閉母(mu)線(xian)槽(cao)都配有(you)某壹插接(jie)口(kou)徑，布設(she)這(zhe)類(lei)接頭(tou)應(ying)考量(liang)多重的(de)人(ren)為幹(gan)擾。然(ran)而(er)，母線(xian)槽初(chu)始的(de)容(rong)量(liang)很(hen)大，同(tong)時構(gou)架緊湊，在(zai)偏大負(fu)荷(he)的(de)態勢下(xia)也帶有(you)優(you)勢。

2. The electrical shafts and enclosed bus ducts installed in high-rise buildings are equipped with a certain socket diameter, and the installation of such joints should consider multiple human interference factors. However, the initial capacity of the bus duct is large, and the structure is compact, which also has advantages in situations of heavy loads.

3、采用(yong)封(feng)閉母(mu)線(xian)槽(cao)載(zai)流(liu)能力穩定，避(bi)免了不(bu)必要的電(dian)能損耗(hao)。母線(xian)槽(cao)標(biao)準滿足(zu)規(gui)範規(gui)定的(de)極(ji)限(xian)溫(wen)升值(zhi)的(de)電(dian)流(liu)(即是母(mu)線槽(cao)的(de)額定電(dian)流(liu))是很(hen)重要的。該電(dian)流(liu)能控(kong)制(zhi)母線(xian)槽的載(zai)流(liu)能力。電(dian)纜的(de)額定電(dian)流(liu)是以截(jie)面積來(lai)確定的(de)。計(ji)算負荷(he)不(bu)同(tong)，橋架內電(dian)纜根(gen)數(shu)不(bu)同(tong)，使用(yong)不(bu)同(tong)的電(dian)纜橋架，橋架內的溫(wen)度隨著上(shang)述(shu)這(zhe)些因(yin)數的(de)不(bu)同(tong)而(er)變化，電(dian)纜的(de)載(zai)流(liu)能力亦(yi)隨之(zhi)變化。

3. The use of enclosed bus ducts ensures stable current carrying capacity and avoids unnecessary energy loss. It is important for the bus duct standard to meet the maximum temperature rise current specified in the specifications (i.e. the rated current of the bus duct). This current can control the current carrying capacity of the bus duct. The rated current of a cable is determined by its cross-sectional area. The calculation load varies, and the number of cables inside the cable tray varies. When using different cable trays, the temperature inside the cable tray changes with the above factors, and the current carrying capacity of the cable also changes accordingly.

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