电气测量辅助技术探讨

:2005-07-01:1007-290X(2005)09-0015-05(,528400):、、、。、、,。:;;;:TM930.1:BOnauxiliarytechniquesforelectricmeasurementYEHua-yi(ZhongshanPowerSupplyBureau,GuangdongPowerGridCorp.,Zhongshan,Guangdong528400,China)Abstract:Thispapermakesadiscussiononthesignalconnection,powersupply,protection,grounding,etc.ofprecisionelectricmeasuringsystem,analyzingatlengththeeffectsofearthwire,electricfieldnoiseandmagneticfieldnoiseonthemeasuringresults.Relevantsolutionandprotectivemeasuresareputforthaswell.Keywords:electricmeasurement;auxiliarytechnique;earthwire;noise11.1,,,,。1,,RE1=0,U1=E1R2R1+R2.(1):R1---R1;R2---R2。RE1,ⅡI2U1,U1=E1R2R1+R2+RE1.(2)ⅡI2,U1=(E1-I2RE1)R2R1+R2+RE1.(3)11.2(2),RE1Ⅰ,;(3),ⅡI2RE1,U1,E1I2,U1。,R1+R2》RE1;,,,,2。22.1,189Vol.18No.920059GUANGDONGELECTRICPOWERSep.200523,220V。N;E,。L1C1,C2,……,Cn。E。Rd1,Rd2,……,Rdn-1,E。,。34,i2,iL,iR,,。,。42.2,:a),。b)。c),。,,。d)、,,ii,。T(5),。5T,。,,ig,T,。5e)220V,,。3、、、,。,,。:,;,,;,,,。3.13.1.16,,CsH。Cs,、,。3.1.2,,。7$(186,C12,,C23。C13,C13Cs1～2。7,,i12。,,。,。,。,,。3.23.2.1、、,。、,,,。3.2.2,。:a),。b)。:1000A,0.5m,0.25m2,10mV;,0mV。,,70%。,,。,。,。,,。,(),。44.1。。(),,。8,,。Z1,10-10F;Z2,。,,。,L,。84.2(),,L,。9%(9:,1,,;L,,L,。,,,L,。,。94.38HL,,,L,,。,,H,L,。,,。4.4,。H,,,。4.5,。5,,、、。、、、,,,。,,,,。:[1].[M].:,1991.[2],.[M].:,1989.:(1972-),,,,,=================================================。(2)1,Haar,,,。3Haar,,,、。、、,,。:[1],.[M].:,1998.[2].[D].:,1997.[3].[M]..:,1995.[4].“”[Z].:,2002.:(1960-),,,,,、。*(18