Parametric Model Of An Air-Core Measuring Transformer

D. Herceg
Faculty of Technical Science, Novi Sad, Serbia

Power grid voltages and currents may be distorted due to presence of harmonics. Measurements of such voltage with harmonics may be performed using newly developed instrument with a small air-core transformer based probe as the input unit. The probe must be shielded against unknown external electromagnetic fields. At the same time, the probe must remain linear throughout the range of frequencies. An air-core transformer based probe was designed with a erromagnetic shield. A parametric model of the shielded transformer is analyzed. Results obtained from a FEM simulations of the model in COMSOL Multiphysics, as well as options for optimization of the shield are presented.