根据以下资料，回(hui)(hui)(hui)答(da)下题(ti)某220kV变(bian)电站(zhan)位于Ⅲ级污(wu)秽区，海拔高度600m，220kV2回(hui)(hui)(hui)电源进线(xian)(xian)，2回(hui)(hui)(hui)负荷出线(xian)(xian)，每(mei)回(hui)(hui)(hui)出线(xian)(xian)各带负荷120MVA，采用(yong)(yong)单母(mu)(mu)线(xian)(xian)分段接线(xian)(xian)，2台电压(ya)等级为(wei)220/110/10kV，容量为(wei)240MVA主(zhu)变(bian)，负载率为(wei)65％，母(mu)(mu)线(xian)(xian)采用(yong)(yong)管(guan)形铝镁合金，户外布置。220kV电源进线(xian)(xian)配(pei)置了(le)变(bian)比为(wei)2000/5A电流(liu)互感器(qi)(qi)(qi)，其主(zhu)保(bao)(bao)(bao)护动作(zuo)时(shi)间(jian)为(wei)，后备(bei)保(bao)(bao)(bao)护动作(zuo)时(shi)间(jian)为(wei)2s，断(duan)路器(qi)(qi)(qi)全分闸时(shi)间(jian)为(wei)40ms，比较大运(yun)行方式(shi)时(shi)，220kV母(mu)(mu)线(xian)(xian)三相短路电流(liu)为(wei)30kA，站(zhan)用(yong)(yong)变(bian)压(ya)器(qi)(qi)(qi)容量为(wei)2台400kVA。请回(hui)(hui)(hui)答(da)下列问题(ti)。304、请计算该站(zhan)用(yong)(yong)于站(zhan)用(yong)(yong)变(bian)压(ya)器(qi)(qi)(qi)保(bao)(bao)(bao)护的高压(ya)熔(rong)(rong)(rong)断(duan)器(qi)(qi)(qi)熔(rong)(rong)(rong)体(ti)(ti)(ti)的额定(ding)电流(liu)，判断(duan)下列哪项是(shi)正确(que)的，并说明(ming)理(li)由。(系(xi)数取(qu))（）A．熔(rong)(rong)(rong)管(guan)25A，熔(rong)(rong)(rong)体(ti)(ti)(ti)30AB．熔(rong)(rong)(rong)管(guan)50A，熔(rong)(rong)(rong)体(ti)(ti)(ti)30AC．熔(rong)(rong)(rong)管(guan)30A，熔(rong)(rong)(rong)体(ti)(ti)(ti)32AD．熔(rong)(rong)(rong)管(guan)50A，熔(rong)(rong)(rong)体(ti)(ti)(ti)32A解答(da)：根据《电力工程电气设计手册》电气一(yi)次部分246页(ye)，公式(shi)6-6及232页(ye)表6-3InR=K*Ibgm=**（400/√3*10）=熔(rong)(rong)(rong)体(ti)(ti)(ti)额定(ding)电流(liu)选32A熔(rong)(rong)(rong)管(guan)额定(ding)电流(liu)要大于熔(rong)(rong)(rong)体(ti)(ti)(ti)额定(ding)电流(liu)。熔(rong)(rong)(rong)断(duan)器(qi)(qi)(qi)的动作(zuo)是(shi)靠熔(rong)(rong)(rong)体(ti)(ti)(ti)的熔(rong)(rong)(rong)断(duan)来实现的，熔(rong)(rong)(rong)断(duan)器(qi)(qi)(qi)有个非(fei)常明(ming)显的特性，就是(shi)安秒特性。辽宁(ning)熔(rong)(rong)(rong)断(duan)器(qi)(qi)(qi)的保(bao)(bao)(bao)护

二、熔(rong)断(duan)器(qi)(qi)(qi)的(de)(de)(de)(de)选(xuan)用(yong)(yong)(yong)1.熔(rong)断(duan)器(qi)(qi)(qi)类型的(de)(de)(de)(de)选(xuan)用(yong)(yong)(yong)根据(ju)使(shi)用(yong)(yong)(yong)环境、负载(zai)性质和(he)(he)短(duan)路(lu)(lu)电(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)大(da)小(xiao)选(xuan)用(yong)(yong)(yong)适当类型的(de)(de)(de)(de)熔(rong)断(duan)器(qi)(qi)(qi)。2.熔(rong)断(duan)器(qi)(qi)(qi)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)压(ya)(ya)(ya)和(he)(he)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)选(xuan)用(yong)(yong)(yong)熔(rong)断(duan)器(qi)(qi)(qi)的(de)(de)(de)(de)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)压(ya)(ya)(ya)必(bi)(bi)须(xu)(xu)等于(yu)(yu)或大(da)于(yu)(yu)线路(lu)(lu)的(de)(de)(de)(de)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)压(ya)(ya)(ya)。熔(rong)断(duan)器(qi)(qi)(qi)的(de)(de)(de)(de)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)必(bi)(bi)须(xu)(xu)等于(yu)(yu)或大(da)于(yu)(yu)所(suo)装(zhuang)熔(rong)体(ti)(ti)的(de)(de)(de)(de)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)。3.熔(rong)体(ti)(ti)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)选(xuan)用(yong)(yong)(yong)（1）对(dui)照(zhao)明和(he)(he)电(dian)(dian)(dian)热(re)等的(de)(de)(de)(de)短(duan)路(lu)(lu)保护(hu)，熔(rong)体(ti)(ti)的(de)(de)(de)(de)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)应(ying)(ying)等于(yu)(yu)或稍大(da)于(yu)(yu)负载(zai)的(de)(de)(de)(de)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)。（2）对(dui)一(yi)台(tai)不经常启动(dong)(dong)且启动(dong)(dong)时间不长(zhang)的(de)(de)(de)(de)电(dian)(dian)(dian)动(dong)(dong)机(ji)的(de)(de)(de)(de)短(duan)路(lu)(lu)保护(hu)，应(ying)(ying)有(you)：IRN≥(～)IN（3)对(dui)多台(tai)电(dian)(dian)(dian)动(dong)(dong)机(ji)的(de)(de)(de)(de)短(duan)路(lu)(lu)保护(hu)，应(ying)(ying)有(you)：IRN≥(～)INmax+∑IN例1－1某(mou)机(ji)床电(dian)(dian)(dian)动(dong)(dong)机(ji)的(de)(de)(de)(de)型号(hao)为(wei)(wei)Y112M－4，额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)功率(lv)为(wei)(wei)4kW，额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)压(ya)(ya)(ya)为(wei)(wei)380V，额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)为(wei)(wei)，该(gai)电(dian)(dian)(dian)动(dong)(dong)机(ji)正(zheng)常工作时不需(xu)要频繁(fan)启动(dong)(dong)。若用(yong)(yong)(yong)熔(rong)断(duan)器(qi)(qi)(qi)为(wei)(wei)该(gai)电(dian)(dian)(dian)动(dong)(dong)机(ji)提(ti)供短(duan)路(lu)(lu)保护(hu)，试确(que)定(ding)(ding)(ding)(ding)(ding)(ding)熔(rong)断(duan)器(qi)(qi)(qi)的(de)(de)(de)(de)型号(hao)规格(ge)。解：（1）选(xuan)择熔(rong)断(duan)器(qi)(qi)(qi)的(de)(de)(de)(de)类型：用(yong)(yong)(yong)RL1系列螺旋式熔(rong)断(duan)器(qi)(qi)(qi)。（2）选(xuan)择熔(rong)体(ti)(ti)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)：IRN=(～)×≈～22A查表1－5得熔(rong)体(ti)(ti)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)为(wei)(wei)：IRN=20A（3）选(xuan)择熔(rong)断(duan)器(qi)(qi)(qi)的(de)(de)(de)(de)额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)和(he)(he)电(dian)(dian)(dian)压(ya)(ya)(ya)：查表1－5，可选(xuan)取RL1－60/20型熔(rong)断(duan)器(qi)(qi)(qi)，其额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)流(liu)(liu)为(wei)(wei)60A，额(e)(e)(e)(e)(e)定(ding)(ding)(ding)(ding)(ding)(ding)电(dian)(dian)(dian)压(ya)(ya)(ya)为(wei)(wei)500V。三、熔(rong)断(duan)器(qi)(qi)(qi)的(de)(de)(de)(de)安(an)装(zhuang)与使(shi)用(yong)(yong)(yong)1.用(yong)(yong)(yong)于(yu)(yu)安(an)装(zhuang)使(shi)用(yong)(yong)(yong)的(de)(de)(de)(de)熔(rong)断(duan)器(qi)(qi)(qi)应(ying)(ying)完(wan)整无损。2.熔(rong)断(duan)器(qi)(qi)(qi)安(an)装(zhuang)时应(ying)(ying)保证熔(rong)体(ti)(ti)与夹头、夹头与夹座接触良好。3.熔(rong)断(duan)器(qi)(qi)(qi)内要安(an)装(zhuang)合格(ge)的(de)(de)(de)(de)熔(rong)体(ti)(ti)。4.更换熔(rong)体(ti)(ti)或熔(rong)管时。辽宁熔(rong)断(duan)器(qi)(qi)(qi)的(de)(de)(de)(de)保护(hu)更换新(xin)熔(rong)体(ti)(ti)时，要检查熔(rong)断(duan)管内部烧(shao)伤情况，如有(you)严重烧(shao)伤，应(ying)(ying)同时更换熔(rong)管。

操(cao)(cao)(cao)作(zuo)前应(ying)(ying)考虑(lv)合(he)(he)(he)环(huan)(huan)(huan)点(dian)(dian)两侧(ce)的(de)(de)相(xiang)角差和电压(ya)(ya)差，并估算(suan)合(he)(he)(he)环(huan)(huan)(huan)潮流(liu)保(bao)证(zheng)不(bu)超过(guo)环(huan)(huan)(huan)流(liu)限额。2）解(jie)环(huan)(huan)(huan)操(cao)(cao)(cao)作(zuo)应(ying)(ying)先(xian)检查解(jie)环(huan)(huan)(huan)点(dian)(dian)的(de)(de)有功(gong)、无(wu)功(gong)潮流(liu)，以确保(bao)解(jie)环(huan)(huan)(huan)后系(xi)统各(ge)部分电压(ya)(ya)在规定(ding)范围内，各(ge)环(huan)(huan)(huan)潮流(liu)的(de)(de)变化不(bu)超过(guo)继电保(bao)护(hu)，系(xi)统稳定(ding)和设备容(rong)量等方面的(de)(de)限额。（9）冲(chong)击(ji)(ji)(ji)合(he)(he)(he)闸(zha)(zha)(zha)、零(ling)(ling)起(qi)(qi)(qi)升(sheng)压(ya)(ya)操(cao)(cao)(cao)作(zuo)：变压(ya)(ya)器(qi)(qi)、母线等设备在新(xin)安装投(tou)入(ru)运行前、大修(xiu)后和故障跳闸(zha)(zha)(zha)后均应(ying)(ying)按有关规定(ding)进(jin)(jin)行全电压(ya)(ya)冲(chong)击(ji)(ji)(ji)操(cao)(cao)(cao)作(zuo)或(huo)(huo)零(ling)(ling)起(qi)(qi)(qi)升(sheng)压(ya)(ya)操(cao)(cao)(cao)作(zuo)。1）冲(chong)击(ji)(ji)(ji)合(he)(he)(he)闸(zha)(zha)(zha)操(cao)(cao)(cao)作(zuo)：①冲(chong)击(ji)(ji)(ji)合(he)(he)(he)闸(zha)(zha)(zha)断(duan)路(lu)器(qi)(qi)要(yao)有足够的(de)(de)遮断(duan)容(rong)量，且断(duan)路(lu)器(qi)(qi)故障跳闸(zha)(zha)(zha)次(ci)数应(ying)(ying)在规定(ding)的(de)(de)次(ci)数内；②冲(chong)击(ji)(ji)(ji)合(he)(he)(he)闸(zha)(zha)(zha)的(de)(de)断(duan)路(lu)器(qi)(qi)其保(bao)护(hu)装置应(ying)(ying)完整(zheng)并投(tou)入(ru)，自动(dong)(dong)重(zhong)合(he)(he)(he)闸(zha)(zha)(zha)应(ying)(ying)停用，必要(yao)时(shi)应(ying)(ying)降低保(bao)护(hu)的(de)(de)整(zheng)定(ding)值；③尽可(ke)(ke)能选择对系(xi)统稳定(ding)性(xing)影响较(jiao)小的(de)(de)电源做(zuo)冲(chong)击(ji)(ji)(ji)合(he)(he)(he)闸(zha)(zha)(zha)电源；④对中(zhong)性(xing)点(dian)(dian)接地(di)系(xi)统中(zhong)的(de)(de)变压(ya)(ya)器(qi)(qi)冲(chong)击(ji)(ji)(ji)时(shi)，其中(zhong)性(xing)点(dian)(dian)应(ying)(ying)接地(di)。2）零(ling)(ling)起(qi)(qi)(qi)升(sheng)压(ya)(ya)操(cao)(cao)(cao)作(zuo)：①被升(sheng)压(ya)(ya)的(de)(de)设备应(ying)(ying)有完善的(de)(de)保(bao)护(hu)装置；②对发电机(ji)一变压(ya)(ya)器(qi)(qi)组升(sheng)压(ya)(ya)时(shi)，应(ying)(ying)采(cai)用手动(dong)(dong)升(sheng)压(ya)(ya)方式(shi)，不(bu)采(cai)用自动(dong)(dong)升(sheng)压(ya)(ya)方式(shi)，且发电机(ji)强(qiang)励装置应(ying)(ying)停用；③中(zhong)性(xing)点(dian)(dian)接地(di)变压(ya)(ya)器(qi)(qi)进(jin)(jin)行零(ling)(ling)起(qi)(qi)(qi)升(sheng)压(ya)(ya)时(shi)，其中(zhong)性(xing)点(dian)(dian)必须接地(di)。（10）系(xi)统并、解(jie)列操(cao)(cao)(cao)作(zuo)：1）系(xi)统在正常情况下的(de)(de)并列操(cao)(cao)(cao)作(zuo)，一般(ban)采(cai)用准同(tong)(tong)(tong)期(qi)法(fa)进(jin)(jin)行（手动(dong)(dong)或(huo)(huo)自动(dong)(dong)）并列。并列条件(jian)为：①相(xiang)序相(xiang)同(tong)(tong)(tong)；②相(xiang)位相(xiang)同(tong)(tong)(tong)；③频率相(xiang)同(tong)(tong)(tong)（事故时(shi)可(ke)(ke)不(bu)超过(guo)）。

可(ke)分(fen)(fen)(fen)为(wei)(wei)：高(gao)压保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、低压保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)和安全电(dian)压保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)。按(an)(an)分(fen)(fen)(fen)断(duan)(duan)能力(li)分(fen)(fen)(fen)，可(ke)分(fen)(fen)(fen)为(wei)(wei)：高(gao)、低分(fen)(fen)(fen)断(duan)(duan)能力(li)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)。按(an)(an)形状分(fen)(fen)(fen)，可(ke)分(fen)(fen)(fen)为(wei)(wei)：平头管(guan)状保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)（又(you)可(ke)分(fen)(fen)(fen)为(wei)(wei)内(nei)焊保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)与外焊保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)）、尖头管(guan)状保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、铡刀(dao)式(shi)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、螺旋(xuan)式(shi)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、插(cha)片式(shi)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、平板式(shi)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、裹(guo)敷式(shi)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、贴(tie)(tie)(tie)片式(shi)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)。按(an)(an)熔断(duan)(duan)速(su)(su)度(du)分(fen)(fen)(fen)，可(ke)分(fen)(fen)(fen)为(wei)(wei)：特慢(man)速(su)(su)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)（一(yi)般用TT表示(shi)）、慢(man)速(su)(su)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)（一(yi)般用T表示(shi)）、中速(su)(su)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)（一(yi)般用M表示(shi)）、快(kuai)速(su)(su)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)（一(yi)般用F表示(shi)）、特快(kuai)速(su)(su)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)（一(yi)般用FF表示(shi)）。按(an)(an)标准分(fen)(fen)(fen)，可(ke)分(fen)(fen)(fen)为(wei)(wei)：欧(ou)规(gui)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、美规(gui)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、日规(gui)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)。按(an)(an)类型分(fen)(fen)(fen)，可(ke)分(fen)(fen)(fen)为(wei)(wei)：电(dian)流保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)（贴(tie)(tie)(tie)片保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、微(wei)型保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、插(cha)片保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)、管(guan)状保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)），温度(du)保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)（RH[方块型]、RP[电(dian)阻型]、RY[金(jin)属壳]），自(zi)恢(hui)复保(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)(bao)险(xian)(xian)(xian)(xian)(xian)丝(si)(si)(si)(si)（插(cha)件、叠片、贴(tie)(tie)(tie)片）。安装新熔体(ti)前，要找出熔体(ti)熔断(duan)(duan)原(yuan)因，未确定熔断(duan)(duan)原(yuan)因，不要拆换熔体(ti)试送。

摘要：纯电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)动(dong)(dong)汽车的(de)驱动(dong)(dong)部(bu)分及(ji)(ji)高(gao)压(ya)附件(jian)系(xi)统(tong)的(de)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源均(jun)为动(dong)(dong)力(li)(li)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源，为保护(hu)车辆及(ji)(ji)乘员安全(quan)，相关动(dong)(dong)力(li)(li)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源回路(lu)均(jun)选(xuan)用(yong)(yong)相应熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)作(zuo)为短路(lu)保护(hu)的(de)措施。本文主要从熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)寿命校核，冲击电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流对熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)影响，熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)分断能(neng)力(li)(li)等方面(mian)(mian)，阐述纯电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)动(dong)(dong)汽车直(zhi)(zhi)流高(gao)压(ya)熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)的(de)选(xuan)型(xing)原(yuan)则及(ji)(ji)验证(zheng)方法。纯电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)动(dong)(dong)汽车的(de)动(dong)(dong)力(li)(li)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)多在(zai)(zai)200~400V，除动(dong)(dong)力(li)(li)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)总熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)外，还(hai)存在(zai)(zai)汽车空调系(xi)统(tong)，暖(nuan)风(feng)系(xi)统(tong)，DC／DC系(xi)统(tong)（将(jiang)动(dong)(dong)力(li)(li)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)转(zhuan)换为14V，提供整车低压(ya)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源，作(zuo)用(yong)(yong)类同(tong)(tong)发电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)机）等其(qi)他附件(jian)高(gao)压(ya)回路(lu)，各回路(lu)均(jun)需串接直(zhi)(zhi)流高(gao)压(ya)熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)做(zuo)回路(lu)保护(hu)。现阶段，陆(lu)续有(you)(you)EV专用(yong)(yong)汽车级(ji)熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)推出，但选(xuan)择面(mian)(mian)还(hai)是比较狭窄。国产直(zhi)(zhi)流熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)的(de)分断能(neng)力(li)(li)及(ji)(ji)保护(hu)特性(xing)均(jun)能(neng)够满足IEC（国际电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)工标准(zhun)化机构）或其(qi)他通用(yong)(yong)标准(zhun)，与相同(tong)(tong)用(yong)(yong)途(tu)的(de)进口产品差别不(bu)大(da)。但在(zai)(zai)相关ROHS（电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)设备(bei)中限制(zhi)使用(yong)(yong)某些有(you)(you)害(hai)(hai)成分的(de)指令）认证(zheng)、极端条件(jian)测(ce)试、系(xi)列产品的(de)自动(dong)(dong)化生产方面(mian)(mian)，仍(reng)略(lve)有(you)(you)差距。直(zhi)(zhi)流高(gao)压(ya)熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)价格稍高(gao)，需在(zai)(zai)能(neng)够有(you)(you)效保护(hu)各系(xi)统(tong)回路(lu)的(de)同(tong)(tong)时(shi)，禁止熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)非正(zheng)常熔(rong)(rong)断现象发生。本文将(jiang)对直(zhi)(zhi)流高(gao)压(ya)熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)的(de)选(xuan)型(xing)原(yuan)则及(ji)(ji)验证(zheng)方法做(zuo)系(xi)统(tong)介绍。保险丝保护(hu)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)设备(bei)不(bu)受过电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流过热的(de)伤害(hai)(hai)，避免电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子设备(bei)因内部(bu)故(gu)障所引起的(de)严重(zhong)伤害(hai)(hai)。辽宁熔(rong)(rong)断器(qi)(qi)(qi)(qi)(qi)的(de)保护(hu)

熔断(duan)(duan)器(qi)的(de)选择主要依(yi)据(ju)负载(zai)的(de)保护特性和(he)短路电流的(de)大小选择熔断(duan)(duan)器(qi)的(de)类型。辽(liao)宁熔断(duan)(duan)器(qi)的(de)保护

熔(rong)(rong)(rong)(rong)(rong)管5起(qi)(qi)绝缘、灭(mie)弧(hu)作(zuo)(zuo)(zuo)用，外(wai)...高压(ya)(ya)跌(die)开式(shi)熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)的(de)(de)(de)操(cao)(cao)作(zuo)(zuo)(zuo)要(yao)求来(lai)(lai)源：电(dian)(dian)(dian)子元(yuan)器(qi)(qi)件(jian)论坛查看：1507回复(fu)(fu)：0高压(ya)(ya)跌(die)开式(shi)熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)具(ju)有熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)保护(hu)(hu)和隔离(li)电(dian)(dian)(dian)源的(de)(de)(de)作(zuo)(zuo)(zuo)用，它(ta)(ta)简单(dan)、经济、实用。在农村配电(dian)(dian)(dian)线路(lu)及(ji)户外(wai)的(de)(de)(de)中小(xiao)型变压(ya)(ya)器(qi)(qi)上得到的(de)(de)(de)使用。在实践中，通过(guo)对高压(ya)(ya)跌(die)开式(shi)熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)操(cao)(cao)作(zuo)(zuo)(zuo)的(de)(de)(de)不断(duan)(duan)总结，人们发现(xian)：三(san)相(xiang)(xiang)负荷在开断(duan)(duan)相(xiang)(xiang)时，断(duan)(duan)口电(dian)(dian)(dian)压(ya)(ya)较(jiao)低(约为(wei))，产生(sheng)(sheng)电(dian)(dian)(dian)弧(hu)小(xiao)；开断(duan)(duan)第(di)二(er)相(xiang)(xiang)时，断(duan)(duan)口电(dian)(dian)(dian)压(ya)(ya)较(jiao)高(为(wei)UP=UL)，切断(duan)(duan)电(dian)(dian)(dian)路(lu)后(hou)往(wang)(wang)往(wang)(wang)出现(xian)强烈电(dian)(dian)(dian)弧(hu)，易使邻(lin)相(xiang)(xiang)短(duan)(duan)路(lu)；拉(la)第(di)三(san)相(xiang)(xiang)时，因电(dian)(dian)(dian)路(lu)已无(wu)电(dian)(dian)(dian)流(liu)(liu)，也(ye)就不会产生(sheng)(sheng)电(dian)(dian)(dian)唬由此看来(lai)(lai)拉(la)第(di)二(er)相(xiang)(xiang)是(shi)(shi)确保安全(quan)(quan)的(de)(de)(de)关键(jian)。另外(wai)，气流(liu)(liu)(刮风、风向)对操(cao)(cao)作(zuo)(zuo)(zuo)的(de)(de)(de)安全(quan)(quan)影响也(ye)是(shi)(shi)明显的(de)(de)(de)。当气流(liu)(liu)将电(dian)(dian)(dian)弧(hu)拉(la)长后(hou)，有可能引起(qi)(qi)相(xiang)(xiang)间短(duan)(duan)路(lu)。...熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)的(de)(de)(de)工作(zuo)(zuo)(zuo)原(yuan)理(li)和选择来(lai)(lai)源：测试测量技术查看：1462回复(fu)(fu)：0熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)是(shi)(shi)保护(hu)(hu)电(dian)(dian)(dian)器(qi)(qi)，常在低压(ya)(ya)电(dian)(dian)(dian)路(lu)如照(zhao)明电(dian)(dian)(dian)路(lu)中起(qi)(qi)过(guo)载保护(hu)(hu)和短(duan)(duan)路(lu)保护(hu)(hu)作(zuo)(zuo)(zuo)用；而在电(dian)(dian)(dian)动(dong)机(ji)控制(zhi)电(dian)(dian)(dian)路(lu)中只起(qi)(qi)短(duan)(duan)路(lu)保护(hu)(hu)作(zuo)(zuo)(zuo)用。它(ta)(ta)串联在电(dian)(dian)(dian)路(lu)中，当通过(guo)的(de)(de)(de)电(dian)(dian)(dian)流(liu)(liu)大于规定值时，熔(rong)(rong)(rong)(rong)(rong)体(ti)熔(rong)(rong)(rong)(rong)(rong)化而自动(dong)分断(duan)(duan)电(dian)(dian)(dian)路(lu)。熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)有管式(shi)、插入式(shi)、螺旋式(shi)、卡式(shi)等(deng)几种(zhong)形式(shi)，其中部分熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)的(de)(de)(de)外(wai)形和符号如图所示(shi)。一、熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)的(de)(de)(de)工作(zuo)(zuo)(zuo)原(yuan)理(li)熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)的(de)(de)(de)主要(yao)元(yuan)件(jian)是(shi)(shi)熔(rong)(rong)(rong)(rong)(rong)体(ti)，它(ta)(ta)是(shi)(shi)熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)的(de)(de)(de)**部分，常做成(cheng)片状或丝(si)状。在小(xiao)电(dian)(dian)(dian)流(liu)(liu)电(dian)(dian)(dian)路(lu)中。辽宁(ning)熔(rong)(rong)(rong)(rong)(rong)断(duan)(duan)器(qi)(qi)的(de)(de)(de)保护(hu)(hu)

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