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.
SHENLu,ZHAOShu-tao,ZHANGPei, et al. Experiment and Analysis of the Measuring Current Transformer with DC Bias and Remnant Flux[J]. Acta Metrologica Sinica, 2014, 35(6): 545-549.
2014, Vol. 35 
