單芯電纜實際并聯使用過程中可能會由于敷設方式的影響

    金聯宇電纜實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)使(shi)用(yong)過(guo)(guo)程(cheng)(cheng)中(zhong)(zhong)以(yi)單(dan)芯(xin)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)較多，單(dan)芯(xin)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)使(shi)用(yong)過(guo)(guo)程(cheng)(cheng)中(zhong)(zhong)可(ke)能(neng)(neng)會(hui)由于(yu)(yu)敷(fu)(fu)設(she)(she)方式的(de)(de)(de)(de)(de)影響，其(qi)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)的(de)(de)(de)(de)(de)載(zai)(zai)(zai)流(liu)(liu)量(liang)(liang)(liang)不一(yi)(yi)定(ding)(ding)能(neng)(neng)夠滿足(zu)(zu)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)負(fu)(fu)荷(he)的(de)(de)(de)(de)(de)需(xu)要，實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)使(shi)用(yong)中(zhong)(zhong)可(ke)能(neng)(neng)會(hui)出現(xian)過(guo)(guo)載(zai)(zai)(zai)現(xian)象(xiang)(xiang)。實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)上(shang)(shang)(shang)，當6根(gen)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)毫無間隙的(de)(de)(de)(de)(de)并(bing)(bing)列碼(ma)放在(zai)空(kong)(kong)氣中(zhong)(zhong)敷(fu)(fu)設(she)(she)后其(qi)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)再流(liu)(liu)量(liang)(liang)(liang)只能(neng)(neng)達到理(li)(li)(li)論(lun)(lun)載(zai)(zai)(zai)流(liu)(liu)量(liang)(liang)(liang)的(de)(de)(de)(de)(de)60%左(zuo)(zuo)右，如果再加上(shang)(shang)(shang)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)(de)(de)(de)(de)負(fu)(fu)荷(he)按理(li)(li)(li)論(lun)(lun)上(shang)(shang)(shang)進(jin)行選擇，沒有(you)按照實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)敷(fu)(fu)設(she)(she)情況進(jin)行校正。很(hen)可(ke)能(neng)(neng)造(zao)成(cheng)(cheng)(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)在(zai)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)通電(dian)(dian)(dian)(dian)(dian)(dian)過(guo)(guo)程(cheng)(cheng)中(zhong)(zhong)上(shang)(shang)(shang)處于(yu)(yu)滿負(fu)(fu)荷(he)運(yun)(yun)(yun)行狀態，造(zao)成(cheng)(cheng)(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)通電(dian)(dian)(dian)(dian)(dian)(dian)運(yun)(yun)(yun)行產(chan)生發熱(re)現(xian)象(xiang)(xiang)。因此在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)(de)(de)(de)(de)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)敷(fu)(fu)設(she)(she)過(guo)(guo)程(cheng)(cheng)中(zhong)(zhong)其(qi)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)載(zai)(zai)(zai)流(liu)(liu)量(liang)(liang)(liang)不是簡單(dan)的(de)(de)(de)(de)(de)存在(zai)"1+1=2"的(de)(de)(de)(de)(de)關系，很(hen)可(ke)能(neng)(neng)出現(xian)"1+1=1.5"甚至出現(xian)"1+1=1"的(de)(de)(de)(de)(de)現(xian)象(xiang)(xiang),造(zao)成(cheng)(cheng)(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)運(yun)(yun)(yun)行過(guo)(guo)程(cheng)(cheng)中(zhong)(zhong)出現(xian)嚴重發熱(re)現(xian)象(xiang)(xiang)。現(xian)在(zai)我(wo)們舉一(yi)(yi)個簡單(dan)的(de)(de)(de)(de)(de)例子,比如容量(liang)(liang)(liang)為(wei)570KW,額定(ding)(ding)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)為(wei)1140A左(zuo)(zuo)右的(de)(de)(de)(de)(de)三(san)相(xiang)異步電(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)負(fu)(fu)載(zai)(zai)(zai),采用(yong)兩根(gen)YJV-0.6/1KV-1金(jin)聯(lian)(lian)(lian)(lian)(lian)宇(yu)300的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)進(jin)行供(gong)電(dian)(dian)(dian)(dian)(dian)(dian),按理(li)(li)(li)論(lun)(lun)設(she)(she)計(ji)計(ji)算(suan)給(gei)定(ding)(ding)值, YJV-0.6/1KV-1金(jin)聯(lian)(lian)(lian)(lian)(lian)宇(yu)300單(dan)根(gen)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)在(zai)空(kong)(kong)氣中(zhong)(zhong)敷(fu)(fu)設(she)(she)起理(li)(li)(li)論(lun)(lun)計(ji)算(suan)載(zai)(zai)(zai)流(liu)(liu)量(liang)(liang)(liang)約為(wei)750A,兩根(gen)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)(de)(de)(de)(de)理(li)(li)(li)論(lun)(lun)并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)載(zai)(zai)(zai)流(liu)(liu)量(liang)(liang)(liang)可(ke)達1500A左(zuo)(zuo)右,完全可(ke)以(yi)滿足(zu)(zu)設(she)(she)備的(de)(de)(de)(de)(de)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)使(shi)用(yong)需(xu)要。我(wo)們現(xian)在(zai)假設(she)(she)有(you)32根(gen)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)全部集(ji)中(zhong)(zhong)在(zai)一(yi)(yi)個在(zai)橋架(jia)上(shang)(shang)(shang)并(bing)(bing)排堆積隨意碼(ma)放敷(fu)(fu)設(she)(she),而(er)上(shang)(shang)(shang)述并(bing)(bing)聯(lian)(lian)(lian)(lian)(lian)供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)兩根(gen)YJV-0.6/1KV-1金(jin)聯(lian)(lian)(lian)(lian)(lian)宇(yu)300也位于(yu)(yu)其(qi)中(zhong)(zhong) 。查(cha)閱相(xiang)關材(cai)料發現(xian),當電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)在(zai)空(kong)(kong)氣中(zhong)(zhong)6根(gen)毫無間隙堆積碼(ma)放后電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)(de)(de)(de)(de)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)載(zai)(zai)(zai)流(liu)(liu)量(liang)(liang)(liang)將下降到理(li)(li)(li)論(lun)(lun)計(ji)算(suan)給(gei)定(ding)(ding)值的(de)(de)(de)(de)(de)60%。那么原(yuan)來的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)(de)(de)(de)(de)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)載(zai)(zai)(zai)流(liu)(liu)量(liang)(liang)(liang)為(wei)1500×60%=900A,每根(gen)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)分配到的(de)(de)(de)(de)(de)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)載(zai)(zai)(zai)流(liu)(liu)量(liang)(liang)(liang)為(wei)450A左(zuo)(zuo)右, 與(yu)理(li)(li)(li)論(lun)(lun)計(ji)算(suan)載(zai)(zai)(zai)流(liu)(liu)量(liang)(liang)(liang)750A相(xiang)差近300A，這樣電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)在(zai)實(shi)(shi)際(ji)(ji)(ji)(ji)(ji)使(shi)用(yong)過(guo)(guo)程(cheng)(cheng)就存在(zai)嚴重過(guo)(guo)載(zai)(zai)(zai)發熱(re)現(xian)象(xiang)(xiang)。

　　而(er)且(qie)實(shi)(shi)際(ji)(ji)(ji)敷設(she)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)的(de)(de)(de)(de)(de)(de)根(gen)(gen)數又(you)遠遠多(duo)于(yu)6根(gen)(gen),那么實(shi)(shi)際(ji)(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)的(de)(de)(de)(de)(de)(de)再流(liu)(liu)量(liang)可(ke)能(neng)(neng)(neng)可(ke)能(neng)(neng)(neng)比(bi)900A還要(yao)(yao)小(xiao)。如(ru)何(he)解決這個問(wen)題,有些人提出再并(bing)聯(lian)(lian)一根(gen)(gen)YJV-0.6/1KV-1金(jin)(jin)聯(lian)(lian)宇(yu)120電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)以(yi)減少其(qi)余(yu)兩根(gen)(gen)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)的(de)(de)(de)(de)(de)(de)分(fen)(fen)(fen)配(pei)(pei)的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu),現(xian)(xian)(xian)在(zai)我(wo)們(men)從理論上(shang)(shang)(shang)先(xian)假(jia)設(she)計算一下,三根(gen)(gen)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)并(bing)聯(lian)(lian)后(hou),負荷(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)(de)(de)實(shi)(shi)際(ji)(ji)(ji)分(fen)(fen)(fen)配(pei)(pei)情(qing)(qing)況(kuang)(kuang)，假(jia)設(she)3根(gen)(gen)并(bing)聯(lian)(lian)使用的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)長(chang)度都為(wei)(wei)(wei)(wei)(wei)1公(gong)(gong)里，敷設(she)溫度全部按20℃計算。而(er)且(qie)假(jia)定并(bing)聯(lian)(lian)的(de)(de)(de)(de)(de)(de)1公(gong)(gong)里兩根(gen)(gen)YJV-0.6/1KV-1金(jin)(jin)聯(lian)(lian)宇(yu)300電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)導(dao)(dao)(dao)體(ti)(ti)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)完(wan)全一致(zhi)。實(shi)(shi)際(ji)(ji)(ji)上(shang)(shang)(shang)由(you)于(yu)制造工(gong)(gong)藝上(shang)(shang)(shang)的(de)(de)(de)(de)(de)(de)問(wen)題不(bu)(bu)可(ke)能(neng)(neng)(neng)達到完(wan)全的(de)(de)(de)(de)(de)(de)一致(zhi)，導(dao)(dao)(dao)體(ti)(ti)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)還是有微(wei)小(xiao)的(de)(de)(de)(de)(de)(de)差別。在(zai)實(shi)(shi)際(ji)(ji)(ji)計算過程我(wo)們(men)忽略上(shang)(shang)(shang)述影響。20℃銅導(dao)(dao)(dao)體(ti)(ti)大(da)直流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)銅芯(xin)300mm2為(wei)(wei)(wei)(wei)(wei)0.0601Ω/km,120 mm2為(wei)(wei)(wei)(wei)(wei)0.153Ω/km, 1140A的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)(de)(de)實(shi)(shi)際(ji)(ji)(ji)分(fen)(fen)(fen)配(pei)(pei)計算120 mm2截面分(fen)(fen)(fen)配(pei)(pei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)為(wei)(wei)(wei)(wei)(wei)(0.0601金(jin)(jin)聯(lian)(lian)宇(yu)0.0601/0.153金(jin)(jin)聯(lian)(lian)宇(yu)0.0601+0.153金(jin)(jin)聯(lian)(lian)宇(yu)0.0601+0.0601金(jin)(jin)聯(lian)(lian)宇(yu)0.0601)=187A,剩余(yu)300 mm2截面的(de)(de)(de)(de)(de)(de)上(shang)(shang)(shang)分(fen)(fen)(fen)配(pei)(pei)的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)為(wei)(wei)(wei)(wei)(wei)953A,而(er)每一根(gen)(gen)300 mm2的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)上(shang)(shang)(shang)實(shi)(shi)際(ji)(ji)(ji)流(liu)(liu)過的(de)(de)(de)(de)(de)(de)負荷(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)為(wei)(wei)(wei)(wei)(wei)477A左右,這樣的(de)(de)(de)(de)(de)(de)情(qing)(qing)況(kuang)(kuang)下電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)的(de)(de)(de)(de)(de)(de)實(shi)(shi)際(ji)(ji)(ji)通電(dian)(dian)(dian)(dian)(dian)(dian)(dian)依然(ran)存在(zai)過載現(xian)(xian)(xian)象。而(er)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)120的(de)(de)(de)(de)(de)(de)實(shi)(shi)際(ji)(ji)(ji)災流(liu)(liu)量(liang)在(zai)這種情(qing)(qing)況(kuang)(kuang)下的(de)(de)(de)(de)(de)(de)載流(liu)(liu)量(liang)為(wei)(wei)(wei)(wei)(wei)435金(jin)(jin)聯(lian)(lian)宇(yu)60%=261A，仍(reng)然(ran)有很(hen)大(da)的(de)(de)(de)(de)(de)(de)余(yu)量(liang)但電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)(de)(de)分(fen)(fen)(fen)配(pei)(pei)規律卻(que)不(bu)(bu)會(hui)將(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)分(fen)(fen)(fen)配(pei)(pei)到120截面的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)上(shang)(shang)(shang)去，實(shi)(shi)際(ji)(ji)(ji)上(shang)(shang)(shang)原來的(de)(de)(de)(de)(de)(de)問(wen)題依然(ran)沒有得到解決。而(er)且(qie)我(wo)們(men)的(de)(de)(de)(de)(de)(de)假(jia)設(she)只有電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)為(wei)(wei)(wei)(wei)(wei)6根(gen)(gen)的(de)(de)(de)(de)(de)(de)情(qing)(qing)況(kuang)(kuang)，也不(bu)(bu)符(fu)合我(wo)們(men)的(de)(de)(de)(de)(de)(de)既(ji)定的(de)(de)(de)(de)(de)(de)要(yao)(yao)求。設(she)想再加一根(gen)(gen)300 mm2截面的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)，其(qi)實(shi)(shi)際(ji)(ji)(ji)載流(liu)(liu)量(liang)的(de)(de)(de)(de)(de)(de)分(fen)(fen)(fen)配(pei)(pei)規律為(wei)(wei)(wei)(wei)(wei)1140金(jin)(jin)聯(lian)(lian)宇(yu)1/3=380A，因此在(zai)實(shi)(shi)際(ji)(ji)(ji)的(de)(de)(de)(de)(de)(de)并(bing)聯(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)過程中(zhong)要(yao)(yao)對所家電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)的(de)(de)(de)(de)(de)(de)截面必(bi)須進行計算嚴正(zheng)后(hou)，才(cai)能(neng)(neng)(neng)進行并(bing)聯(lian)(lian)使用，否則及(ji)時加了電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)可(ke)能(neng)(neng)(neng)也不(bu)(bu)能(neng)(neng)(neng)解決問(wen)題，好的(de)(de)(de)(de)(de)(de)情(qing)(qing)況(kuang)(kuang)是采用加相同規格的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)，而(er)且(qie)保(bao)(bao)證長(chang)度相同，這樣保(bao)(bao)證電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)(de)(de)分(fen)(fen)(fen)配(pei)(pei)基(ji)本均勻。實(shi)(shi)際(ji)(ji)(ji)上(shang)(shang)(shang)在(zai)現(xian)(xian)(xian)場(chang)安(an)裝全部完(wan)成以(yi)后(hou)再進行一次現(xian)(xian)(xian)場(chang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)的(de)(de)(de)(de)(de)(de)重(zhong)新安(an)裝和返工(gong)(gong)，在(zai)一般情(qing)(qing)況(kuang)(kuang)下是很(hen)難(nan)實(shi)(shi)現(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)。因此電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)(lan)先(xian)期的(de)(de)(de)(de)(de)(de)正(zheng)規設(she)計和敷設(she)安(an)裝工(gong)(gong)作(zuo)至關重(zhong)要(yao)(yao)，后(hou)期所采取的(de)(de)(de)(de)(de)(de)方式往往只是一種補(bu)救措施，很(hen)難(nan)從根(gen)(gen)本上(shang)(shang)(shang) 解決問(wen)題。

　　而且在(zai)(zai)(zai)多芯(xin)電(dian)(dian)纜(lan)的(de)(de)并聯(lian)(lian)使用過程中也(ye)存在(zai)(zai)(zai)一(yi)(yi)些問(wen)(wen)題，鎧(kai)(kai)(kai)狀(zhuang)電(dian)(dian)纜(lan)并聯(lian)(lian)要(yao)將每(mei)根電(dian)(dian)纜(lan)的(de)(de)的(de)(de)主(zhu)線芯(xin)A，B，C三(san)相錯開對應(ying)并聯(lian)(lian)使用，不能(neng)(neng)將鎧(kai)(kai)(kai)狀(zhuang)多芯(xin)電(dian)(dian)纜(lan)的(de)(de)所(suo)有(you)線新(xin)并接在(zai)(zai)(zai)一(yi)(yi)相上當單芯(xin)電(dian)(dian)纜(lan)使用，如果(guo)這樣做(zuo)，會(hui)在(zai)(zai)(zai)電(dian)(dian)纜(lan)的(de)(de)鎧(kai)(kai)(kai)狀(zhuang)鋼(gang)(gang)帶(dai)中產生(sheng)渦流效應(ying)，造(zao)成電(dian)(dian)纜(lan)的(de)(de)發熱(re)(re)，產生(sheng)熱(re)(re)擊穿故障(zhang)。這雖(sui)然是一(yi)(yi)個很簡單的(de)(de)電(dian)(dian)學原理，但在(zai)(zai)(zai)筆者多次走訪用戶的(de)(de)過程中有(you)時還是有(you)用戶提出類似的(de)(de)問(wen)(wen)題和做(zuo)法(fa)。在(zai)(zai)(zai)三(san)相四(si)線制不平衡(heng)(heng)照明負(fu)載中，我(wo)們負(fu)載的(de)(de)接線和分(fen)配方(fang)式(shi)要(yao)盡(jin)可能(neng)(neng)保證(zheng)負(fu)載的(de)(de)分(fen)配均勻，盡(jin)可能(neng)(neng)保證(zheng)三(san)相電(dian)(dian)流平衡(heng)(heng)，否則可能(neng)(neng)會(hui)由于三(san)相電(dian)(dian)流的(de)(de)嚴重不平衡(heng)(heng)造(zao)成在(zai)(zai)(zai)鎧(kai)(kai)(kai)狀(zhuang)鋼(gang)(gang)帶(dai)中產生(sheng)交變感應(ying)電(dian)(dian)流，造(zao)成電(dian)(dian)纜(lan)的(de)(de)發熱(re)(re)。

　　金聯宇電(dian)(dian)纜(lan)的(de)(de)并聯使(shi)(shi)用對于各線(xian)(xian)路(lu)端部接線(xian)(xian)鼻子的(de)(de)松(song)緊(jin)程度(du)也要引起注意，因(yin)為使(shi)(shi)用并聯電(dian)(dian)纜(lan)的(de)(de)負載的(de)(de)容量一般都(dou)比較(jiao)大，其每公里的(de)(de)導(dao)體(ti)電(dian)(dian)阻都(dou)在(zai)0以(yi)下，如果在(zai)線(xian)(xian)路(lu)的(de)(de)任何一端一旦出現(xian)線(xian)(xian)鼻子松(song)動和接觸不良現(xian)象(xiang)，都(dou)會(hui)成(cheng)(cheng)倍增加線(xian)(xian)路(lu)的(de)(de)導(dao)體(ti)電(dian)(dian)阻，造(zao)成(cheng)(cheng)電(dian)(dian)流(liu)分(fen)配不均甚至(zhi)旁路(lu)現(xian)象(xiang)，這樣就會(hui)造(zao)成(cheng)(cheng)并聯的(de)(de)個(ge)別電(dian)(dian)纜(lan)產(chan)生發熱現(xian)象(xiang)，引發故(gu)障(zhang)。

　　同(tong)時可(ke)能(neng)電纜(lan)的(de)(de)實際線路的(de)(de)導體(ti)電阻并不可(ke)能(neng)完(wan)全(quan)一致，因此相同(tong)型號規格的(de)(de)電纜(lan)在對電流的(de)(de)分(fen)配也不可(ke)能(neng)是平(ping)均分(fen)配，可(ke)能(neng)在電流的(de)(de)實際分(fen)配過程中可(ke)能(neng)還存(cun)在一定的(de)(de)差異(yi)。

　　因此在多根單(dan)芯電(dian)纜(lan)的(de)實際并聯(lian)使(shi)(shi)用過程中要根據其實際敷設情況進行校正(zheng)，否則可能造(zao)成電(dian)纜(lan)并聯(lian)使(shi)(shi)用過程產(chan)生發熱現象，影響電(dian)纜(lan)的(de)正(zheng)常(chang)使(shi)(shi)用。