Angle differenceSis an important part ofStransformer accuracy and one of the mainSfactors influencing theSpower measurement accuracy.SBut in theSpower measurement ofS inverter motors,S,Sinverters and voltage,Scurrent sensors,Sthe angle error of sensorSis often ignored because the nominalSangle error of Holzer voltage and current sensorsSwidely usedS are notSgiven in general,S.SThrough a large number of testsSbased onSLEMS’s LV100-4000 typeSof Holzer voltage sensor,StheSphase error is analyzed and calculated. The result is basically consistent with the angle difference derived fromSthe nominalSrise timeSof sensors.SOn the base of thisSthe formula of HolzerSvoltage sensorSangle difference is presentedSand according to whichSangleSdifference referenceSvalues of Holzer voltage sensors commonly used are presented.