电测与仪表
電測與儀錶
전측여의표
Electrical Measurement & Instrumentation
2015年
18期
36-40
,共5页
电子式电能表%工频外磁场试验%附加误差
電子式電能錶%工頻外磁場試驗%附加誤差
전자식전능표%공빈외자장시험%부가오차
electronic energy meter%power frequency magnetic fields test%additional error
分析了电子式电能表工频外磁场试验引入的附加误差与试验条件的关系。针对国标规定的电能表工频外磁场试验方法不能保证锰铜分流器变换式电能表在其全电流量程内的抗工频外磁场能力,提出在电能表电流测量范围的下限,即10%Ib(直接式)、5%In(互感式)进行该项试验的改进型试验方法。经计算,电能表若满足文章建议的试验要求,其在该工频磁场下的感应电流必小于起动电流,不会出现空载走字。对国网新增工频磁场潜动性能试验的测试时间合理性进行分析,提出应以不大于1/0.6倍理论起动时间的看法。测量统计了我国近5年内锰铜分流器变换式电能表的抗工频外磁场能力,总体看该性能逐年提升,在2014年有较大提高(附加误差<0.2%)。
分析瞭電子式電能錶工頻外磁場試驗引入的附加誤差與試驗條件的關繫。針對國標規定的電能錶工頻外磁場試驗方法不能保證錳銅分流器變換式電能錶在其全電流量程內的抗工頻外磁場能力,提齣在電能錶電流測量範圍的下限,即10%Ib(直接式)、5%In(互感式)進行該項試驗的改進型試驗方法。經計算,電能錶若滿足文章建議的試驗要求,其在該工頻磁場下的感應電流必小于起動電流,不會齣現空載走字。對國網新增工頻磁場潛動性能試驗的測試時間閤理性進行分析,提齣應以不大于1/0.6倍理論起動時間的看法。測量統計瞭我國近5年內錳銅分流器變換式電能錶的抗工頻外磁場能力,總體看該性能逐年提升,在2014年有較大提高(附加誤差<0.2%)。
분석료전자식전능표공빈외자장시험인입적부가오차여시험조건적관계。침대국표규정적전능표공빈외자장시험방법불능보증맹동분류기변환식전능표재기전전류량정내적항공빈외자장능력,제출재전능표전류측량범위적하한,즉10%Ib(직접식)、5%In(호감식)진행해항시험적개진형시험방법。경계산,전능표약만족문장건의적시험요구,기재해공빈자장하적감응전류필소우기동전류,불회출현공재주자。대국망신증공빈자장잠동성능시험적측시시간합이성진행분석,제출응이불대우1/0.6배이론기동시간적간법。측량통계료아국근5년내맹동분류기변환식전능표적항공빈외자장능력,총체간해성능축년제승,재2014년유교대제고(부가오차<0.2%)。
The relationship between test conditions for power frequency magnetic fields of external origin and the measurement additional error of energy meter was analyzed .According to international regulation that external power frequency magnetic field test method of electric energy meter can not ensure the anti power frequency magnetic field as using copper-manganese shunt energy meter , so it presents the lower bound of energy meter current range , that is 10%Ib (direct type) and 5%In (mutual inductance) to carry out the improved test.Simulation indicates, if meter meet the test requirements of 0 .5 mT power frequency magnetic field at the load point suggested in article , it can en-sure the induced current is less than the starting current .To the test method of no load test in the power frequency magnetic field , it discusses its rationality of test time , and the view that the theorotical starting time should be no more than 1/0.6 times is presented.Statistical measuring additional errors of different types of energy meter using copper-manganese shunt in the past 5 years,we find that the anti power frequency magnetic field capacity of energy meter in-creased year by year , and it has a breakthrough improvement (<0.2%) in 2014.