浅论电气线路的短路起火和线路过载的防范

():,,,,:,,30%,,40%,,,,11(b)(),,1(a),,IEC364(Earthfault),2TT(),,IdRARBRA108,RB48,Id=U0ö(RA+RB)=220ö(10+4)=15.7A(),,,3TN(),,(ab)(PE)(cd),,,,,,,,12TT31©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.410kV3TNPE2,,,PE,(),,,,,,IEC364-4-482IEC364-5-53,1995,()4,,012In(In),1600A320A,,,3,(10kV),,10kV,,TT,410kV,10kV10kV,Id,RBUf=IdRB,Id,600A,RB=48,Uf=2400V015s1s,10kV,TT,Us=Uf+U02180V2620VIEC364-4-442,5s,Uo+1200V,220V+1200V=1420V,,IEC364-4-442,,5,Uf,TT4,IEC364-4-43;(41©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.),,,,,,,,55IEC364-4-43:IBINIZ(1)I21145IZ(2):IBINIZI2,,:511,,,IEC364-5-523,,,,,,215mm2,IEC364-5-523,26A,,32A,23%,,512,,,,,,,,1,:1,kW241163779,A10406040,A20636350(),mm26101614141819221,,,,,6,1,,,,,,50Hz,3915,,(NEC),1999NEC51©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2,,,,,,,,,,,,,:,,,,(IEC),82217,100088:010-6203907162038836()():,,:,,,,,,90,,,,,,19988,80m,,,,,,,1,,,,,,,,,(LEL)(m)111,:K1,K2,,61©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.