(300450):。:;;;;:TM406:B:1001-8425(2010)09-0051-04MeasurementofCapacitanceandDielectricLossofCapacitorBushinginTransformerTIANCheng-feng(TianjinBinhaiPowerSupplyCompany,Tianjin300450,China)Abstract:Theconnectionandresultsofcapacitanceanddielectriclossmeasurementofcapacitorbushingintransformeraremodified.Keywords:Transformer;Bushing;Capacitance;Dielectricloss;Measurement120089,,6-5%-8%,《》“±5%”,610kV245/3姨kV,-5%,tanδ。,。,,。1。22.1、、,C1C2,C1,,R1();C2()(),R2,1。2.2,,C1,C2,,TRANSFORMER47920109Vol.47SeptemberNo.920101Table1Dataofcapacitances/kV10731091491414———2502917237.0(-5.2%)———21022232.0(-7.2%)229.2(-8.3%)229.2(-8.3%)29.3(-8.2%)11030246.0(-1.6%)———pF:。47C1。2.32.3.1C1,,[1,2]。(,),,(C2),,,,,C2,2(1)。2.3.2,,,,C2,R3,3(2)。33.111,:C1=CN·R4R3·11+tan2δ1tanδ1C1,,,1,C1≈CN·R4R3。:tanδ1=1ωC1R1=ωC4R4ω———,ω=2πfR4———R3,C4。3.2212,,,R3C2R2,,,2R321R31,R32//R2//C2=R31,R32R31,R3,21。,2R3C2R2,,,,准(C1//R1)+准(C4//R4)=准(CN)+准(C2//R2//R3),R3,0°~90°,1R30°0°~90°,准(C1//R1),tan准(C1//R1),tanδ(C1//R1)。,21,,[3]~[5]。4C1C2R1R21Fig.1BushingcapacitancestructureC1CNC4R1R4R321Fig.2Connectionmode1C1C2C4CNR1R3R2R432Fig.3Connectionmode25294.121,2,:,,:11R1+jωC1·11R4+jωC4=1jωCN·11R2+1R3+jωC2、,:1R1·1R4-ω2C1C4=-ω2C2CNωC4R1+ωC4R4=ωCNR2+ωCNR3R1:C1=CN·R4R3·11+ω2C24R24+CNR4R2·1+ω2C4R4C2R21+ω2C24R24,ω2C24R24,1,:C1≈CNR4R3+CNR4R2+CNC2C4·ω2C24R24≈CNR4R3+CNR4R2C1=CNR4R3,CNR4R2,CNR4,R2(2),,=(C1-C1)/C1=-CNR4R2/(CNR4R3+CNR4R2)=-R3R3+R2。R3C1=-CNR4C1R2。,CNR4,C1R2,C1CN,R2(,)R4,R2,。,2,CNR4R2,。4.22:,,准(C1//R1)+准(C4//R4)=准(CN)+准(C2//R2//R3),tanδ1=ωC4R4-ωC2R3R2R3+R2。R2R3,tanδ1≈ωC4R4-ωC2R3,ωC4R4,ωC2R3,ωC2R3≈ωCNR4·C2C1,C2C1,=(tanδ1-tanδ1)/tanδ1=C2R3C4R4-C2R3=1C4R4C2R3-1≈1C1C4CNC2-1=1C1tanδ1ωR4CNC2-1,C2C1,C2/C1,,,。2,ωC2R3≈ωCNR4·C2C1。4.324.3.122,。,,,,,2CNR4R2;2ωC2R3(≈ωCNR4·C2C1)。4.3.2,2,CNR4R2,-CNR4C1R2,CNR4,C1R2,C1CN,R2(,)R4,5347R2,,(1)-5%;2。2ωC2R3(≈ωCNR4·C2C1),,,[3]~[5]。5(1),C1,C2,。C1。(2)2,,,CNR4R2,;,ωC2R3≈ωCNR4·C2C1,C2C1,C2/C1,,,。(3)1,C2,。(2),5%。2。(4)1,2,2。:[1].[M].:,1991.[2].[M].:,1998.[3],.500kV[J].,2000,26(5):74-75.[4].110kV[J].,2003,40(2):41-42.[5].500kVtanδ[J].,1994,16(2):95-98.:2009-06-02:(1972-),,,,。≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈:2010-03-17:(1962-),,,,、、。(36),,,,,,,。,、、,,、,。:[1].[J].,2003,(9):25-29.[2].[J].,2008,36(11):79-83.[3],,.[J].,2006,30(15):97-10.54