380三相4线(xian)(xian)电(dian)表接线(xian)(xian)图-三相4线(xian)(xian)电(dian)表接线(xian)(xian)方法(fa)图解(jie)-KIA MOS管
信(xin)息来源：本站 日期：2018-10-31
380三相(xiang)(xiang)4线(xian)电(dian)表接(jie)线(xian)图(tu)，翻过(guo)接(jie)线(xian)端子(zi)盖,就(jiu)可以(yi)看到三相(xiang)(xiang)四线(xian)电(dian)表接(jie)线(xian)图(tu)。其中1、4、7接(jie)电(dian)流互(hu)感器(qi)二次(ci)侧(ce)S1端，即(ji)电(dian)流进线(xian)端；3、6、9接(jie)电(dian)流互(hu)感器(qi)二次(ci)侧(ce)S2端，即(ji)电(dian)流出线(xian)端；2、5、8分别接(jie)三相(xiang)(xiang)电(dian)源；10、11是接(jie)零端。为了安全，应将电(dian)流互(hu)感器(qi)S2端连接(jie)后(hou)接(jie)地。 注(zhu)意的是各电(dian)流互(hu)感器(qi)的电(dian)流测(ce)量取(qu)样(yang)必须与其电(dian)压(ya)取(qu)样(yang)保持同相(xiang)(xiang)，即(ji)1、2、3为一(yi)组(zu)；4、5、6 为一(yi)组(zu)；7、8、9 为一(yi)组(zu)。
三相(xiang)四线(xian)(xian)制(zhi)，在(zai)(zai)低(di)压配电(dian)(dian)(dian)(dian)网(wang)中(zhong)(zhong)(zhong)，输电(dian)(dian)(dian)(dian)线(xian)(xian)路一(yi)般采用(yong)三相(xiang)四线(xian)(xian)制(zhi)，其(qi)中(zhong)(zhong)(zhong)三条(tiao)线(xian)(xian)路分别代表A,B,C三相(xiang)，另一(yi)条(tiao)是中(zhong)(zhong)(zhong)性(xing)(xing)线(xian)(xian)N或PEN（如果该回路电(dian)(dian)(dian)(dian)源侧(ce)的中(zhong)(zhong)(zhong)性(xing)(xing)点接地(di)，则中(zhong)(zhong)(zhong)性(xing)(xing)线(xian)(xian)也(ye)(ye)称(cheng)为(wei)零(ling)线(xian)(xian)(老式叫法，应(ying)逐渐(jian)避免，改称(cheng)PEN，如果不接地(di)，则从(cong)严(yan)格意(yi)义(yi)上来说，中(zhong)(zhong)(zhong)性(xing)(xing)线(xian)(xian)不能称(cheng)为(wei)零(ling)线(xian)(xian)）。在(zai)(zai)进入(ru)用(yong)户的单相(xiang)输电(dian)(dian)(dian)(dian)线(xian)(xian)路中(zhong)(zhong)(zhong)，有(you)两条(tiao)线(xian)(xian)，一(yi)条(tiao)我们称(cheng)为(wei)相(xiang)线(xian)(xian)L，另一(yi)条(tiao)我们称(cheng)为(wei)中(zhong)(zhong)(zhong)线(xian)(xian)N，中(zhong)(zhong)(zhong)线(xian)(xian)正常情况下(xia)要通过(guo)电(dian)(dian)(dian)(dian)流以构成(cheng)单相(xiang)线(xian)(xian)路中(zhong)(zhong)(zhong)电(dian)(dian)(dian)(dian)流的回路。而三相(xiang)系统(tong)中(zhong)(zhong)(zhong)，三相(xiang)平衡时，中(zhong)(zhong)(zhong)性(xing)(xing)线(xian)(xian)（零(ling)线(xian)(xian)）是无电(dian)(dian)(dian)(dian)流的，故称(cheng)三相(xiang)四线(xian)(xian)制(zhi)；在(zai)(zai)380V低(di)压配电(dian)(dian)(dian)(dian)网(wang)中(zhong)(zhong)(zhong)为(wei)了从(cong)380V线(xian)(xian)电(dian)(dian)(dian)(dian)压中(zhong)(zhong)(zhong)获得220V相(xiang)电(dian)(dian)(dian)(dian)压而设N线(xian)(xian)，有(you)的场合也(ye)(ye)可(ke)以用(yong)来进行(xing)零(ling)序电(dian)(dian)(dian)(dian)流检测，以便进行(xing)三相(xiang)供电(dian)(dian)(dian)(dian)平衡的监控(kong)。
PE线（保护接(jie)地(di)(di)线），在用(yong)户侧需(xu)要重(zhong)复(fu)接(jie)地(di)(di)，以(yi)(yi)提高可(ke)靠性。但是(shi)，重(zhong)复(fu)接(jie)地(di)(di)只(zhi)是(shi)重(zhong)复(fu)接(jie)地(di)(di)，它只(zhi)能在接(jie)地(di)(di)点(dian)或靠近接(jie)地(di)(di)的(de)位置接(jie)到(dao)一起，但绝不表明可(ke)以(yi)(yi)在任意位置特(te)别是(shi)户内(nei)可(ke)以(yi)(yi)接(jie)到(dao)一起。
注意(yi)“三(san)(san)相四线(xian)(xian)”制是带电(dian)导(dao)体(ti)系(xi)(xi)统(tong)(tong)(tong)(tong)分(fen)类中的(de)(de)一(yi)种， [1] 和(he)接(jie)(jie)(jie)地系(xi)(xi)统(tong)(tong)(tong)(tong)分(fen)类无(wu)任何关系(xi)(xi)，应注意(yi)避(bi)免“三(san)(san)相五(wu)(wu)线(xian)(xian)制”这种错误的(de)(de)叫法。 [2] TN-S系(xi)(xi)统(tong)(tong)(tong)(tong)也不是“三(san)(san)相五(wu)(wu)线(xian)(xian)制”。任一(yi)带电(dian)导(dao)体(ti)系(xi)(xi)统(tong)(tong)(tong)(tong)都可(ke)(ke)采(cai)(cai)(cai)用(yong)任一(yi)接(jie)(jie)(jie)地系(xi)(xi)统(tong)(tong)(tong)(tong)。例如(ru)三(san)(san)相四线(xian)(xian)带电(dian)导(dao)体(ti)系(xi)(xi)统(tong)(tong)(tong)(tong)，可(ke)(ke)采(cai)(cai)(cai)用(yong)TN-S接(jie)(jie)(jie)地系(xi)(xi)统(tong)(tong)(tong)(tong)，也可(ke)(ke)采(cai)(cai)(cai)用(yong)TN-C-S或TT接(jie)(jie)(jie)地系(xi)(xi)统(tong)(tong)(tong)(tong)。这三(san)(san)种接(jie)(jie)(jie)地系(xi)(xi)统(tong)(tong)(tong)(tong)的(de)(de)末(mo)端(duan)都是五(wu)(wu)根线(xian)(xian)，都可(ke)(ke)称作“三(san)(san)相五(wu)(wu)线(xian)(xian)制”，那又(you)如(ru)何将他们加以区(qu)分(fen)呢？因此“三(san)(san)相五(wu)(wu)线(xian)(xian)制”是一(yi)个混淆接(jie)(jie)(jie)地系(xi)(xi)统(tong)(tong)(tong)(tong)和(he)带电(dian)导(dao)体(ti)系(xi)(xi)统(tong)(tong)(tong)(tong)两个互(hu)不关联的(de)(de)系(xi)(xi)统(tong)(tong)(tong)(tong)的(de)(de)错误名(ming)词，在编制电(dian)气(qi)规范(fan)和(he)设计文件时应注意(yi)避(bi)免采(cai)(cai)(cai)用(yong)。GB16895.1-2008里没有(you)“三(san)(san)相五(wu)(wu)线(xian)(xian)制”的(de)(de)提法，只有(you)“三(san)(san)相四线(xian)(xian)制”。“三(san)(san)相四线(xian)(xian)制”属于带电(dian)导(dao)体(ti)系(xi)(xi)统(tong)(tong)(tong)(tong)分(fen)类中的(de)(de)一(yi)种，TN-S系(xi)(xi)统(tong)(tong)(tong)(tong)属于接(jie)(jie)(jie)地系(xi)(xi)统(tong)(tong)(tong)(tong)分(fen)类中的(de)(de)一(yi)种。
以下(xia)图(tu)为(wei)例，下(xia)图(tu)中有3根(gen)(gen)相线(xian)，1根(gen)(gen)N线(xian)，1根(gen)(gen)PE线(xian)，但显然不是TN-S系统(tong)，而是TT系统(tong)。下(xia)图(tu)的(de)带(dai)电导(dao)体系统(tong)分(fen)类(lei)属于“三相四线(xian)制”，接地系统(tong)分(fen)类(lei)属于“TT系统(tong)”。
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