|
|
|
| Experiment and Analysis of the Measuring Current Transformer with DC Bias and Remnant Flux |
| SHENLu,ZHAOShu-tao,ZHANGPei,TIANXiao-qian |
| DepartmentofElectricalandElectronicEngineering,NorthChinaElectricPowerUniversity,Baoding,Hebei 071003,China |
|
|
|
|
Abstract DC bias and remnant flux will change the measuring current transformer working point in the core magnetization curve and have a direct impact on the accuracy of electric energy measurement.An error measurement method based on the algorithm for three-parameter least squares fit to sine wave is put forward and the influence of DC bias and remnant flux on error characteristics of current transformer is also investigated through experiments.The experimental data shows that DC bias and remnant flux will increase the ratio error and phase displacement in opposite directions and the ratio and phase displacement will be far more than the limit value when they are exist in same direction at the same time .This will seriously affect the transmission accuracy of current transformer.
|
|
|
|
|
|
［1］陈黎来.电流互感器对电能计量的影响［J］.电力自动化设备,2011,31(1):138-141.
［2］赵畹君.高压直流输电工程技术［M］.北京:中国电力出版社,2005.
［3］崔迎宾,谭震宇,李庆民,等.电流互感器剩磁影响因素和发生规律的仿真分析［J］.电力系统自动化,2010,34(23):87-91.
［4］梁仕斌,文华,曹敏,等.铁心剩磁对电流互感器性能的影响［J］.继电器,2007,35(22):27-32.
［5］李长云,李庆民,李贞,等.直流偏磁下电流互感器的传变特性［J］.中国电机工程学报,2010,30(19):127-132.
［6］MeiselJ.Currentinstrumenttransformererrorcalculations［J］.IEEETrans.onPowerApparatusandSystems,1963,82(69):1082-1085.
［7］KappenmanJG,AlbertsonVD,MohanN.CurrentTransformerandrelayperformanceinthepresenceofgeomagnetically-inducedcurrents［J］.IEEETrans.onPowerApparatusandSystems,1981,100(3):1078-1088.
［8］国家质量监督检验检疫总局.JJG313-2010测量用电流互感器［S］.2010.
［9］IEEEStd1057-2007.IEEEstandardfordigitizingwaveformrecorders［S］.2007.
［10］张燕乘,刘连光,张清明,等.基于PSCAD/EMTDC的电网GIC影响仿真分析［J］.华北电力技术,2004,(6):10-13.
［11］国家质量监督检验检疫总局.GB1208-2006电流互感器［S］.2006. |
|
|
|
2014, Vol. 35 
