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X:2006-12-11:(1978-),,,,.PIC16F877AX1,2,1(1.,400035;2.,400037):,PIC16F877A,,,.,,.:;;;PIC16F877A:TD611:A:1671-0924(2007)02-0117-03OnthePrinciplesandApplicationsofSelectiveLeakage2protectionofLowVoltageDistributionNetworksforMinesBasedonPIC16F877ALIUMei2hua1,WANGDong2,YANGYan2qiu2(1.ChongqingCommunicationCollege,Chongqing400035,China;2.GasInstitute,ChongqingCoalScienceAcademy,Chongqing400037,China)Abstract:Basedontheanalysisofthepresentleakage2protectionsystemforundergroundlowvoltagedistri2butionnetworks,thispaperputsforwardanewselectiveleakage2protectionschemebasedonadditionalDCpowersupplyanddirectionofzerosequencepowerwithPIC16F877Aasthecore,whichsimplifiesthede2signofconventionalprotectiondevicesandcanenhancelevelsofsafetyforundergroundlowvoltagedistri2butionnetworks.Thispaperemphaticallyanalyzesprinciplesofprotectivesystems,introducestherealiza2tionofprotectiondevicebriefly.Thissystemcanimprovesecurityoflowvoltagedistributionnetworks.Keywords:selectivity;leakage2protection;minelowvoltagedistributionnetworks;PIC16F877A0,,,,,,,212Vol.21No.2JournalofChongqingInstituteofTechnology20072Feb.2007[1].,1.13,Q1Q2Q33,T.,,.,,,[2-3].1.,,:..1.1,,2.IRsU,r.LNmR[4].I(1):I=UR(L)/3+R+RS+RE+r=UR+r(1)(1):R(L);RE;r,r=r/3.,r,I.Us:Us=IRs=UR+rRs(2)(3):r=UUsRs-R(3),(3);,r,.,,,.[5]..,.21.231K2.L1,L2,L3,;Rf,A.U0,.3L1,L2:3I01=U03r01+j3C01=Ir01+IC01(4)3I02=U03r02+j3C02=Ir02+IC02(5)3I03=U03r03+j3C03=Ir03+IC03(6)L3:3I03=-U03r01+3r02+3r03+j3(C0-C03)=811-Ir-(IC01+IC02+IC03)(7)(7):C0;C0=C1+C2+C3+C4;Ir=Ir1+Ir2+Ir4.(4)(7)3,L32:-Ir,180;-(IC01+IC02+IC04),90.2:;,90.,.32,,,.,.I0,U0I,U,:I=arctanI0II0R,U=arctanU0IU0R=U-I,:sin=1(I20I+I20R)+(U20I+U20R)(I0RU0I-I01U0R)(8)(8):U0I,U0R,I0I,I0RU0,I0.I090,U0,I0U0,:Pr=U01I01cos(+90)(9)(9)U01,I01U0,I0,:U01=U20R+U20I,I01=I20R+I20I(8)(9):Pr=I0IU0R-I0RU0I(10)(4)(7),L3:Pr=U0ICL1():Pr=-U0IC1:ICIC01+IC02+IC04;IC1IC01.,Pr0,Pr0,Pr.(10)[5-6].3,,,,,4.4CPUPIC16F877A,10A/D,,.,,[7].,,,.(128)911,:PIC16F877A;,,.,.,,.3.5,.,,,.,,,,,,.4,,.,.,,.:[1].[J].,2003(6):82-83.[2].[M].:.2003:110-112.[3].[J].:,2002(3):275-276.[4].[J].,2006,20(9):190-191.()(119),.RS485,,PIC16F877A,.4PIC16F877A,,,.:[1],,,.[J].,1998,22(9):53-56.[2],,,.[J].,1999,2:37-38.[3].[M].:,1999.[4],,.[J].,2003,18(1):82-86.[5],,,.[J].,1995,23(1):51-53.[6],.[J].,2004,2:7-10.[7],,,.[J].,1999,237-38.()821