Printed Circuit Board Rogowski Coil with Symmetric Foils

We design a new type of printed circuit board(PCB) Rogowski coil with symmetric foils.Straight copper foils with polymers in both ends are uniformly and densely covered through radius in the double-printed board.Each coil unit is formed from the symmetric foils connected by the polymers with bit arc in double-face.So each coil unit is vertical to the coil plane and direct to the axis.Meanwhile,the returning turn which is reverse to the winding direction is set up to the output end in order to suppress the stray magnetic interference vertical to the PCB plane,and the electromagnetic parameters of the coil are calculated.The mutual-inductance characteristic between the coil and the primary conductor is investigated when the conductor offsets axis and interference current exists beyond the coil.Also the value of mutual-inductance is measured under the disturbed conditions.The measurement results accord with the calculation ones.The new Rogowski coil performs well on uniformity and anti-interference property,and is suitable as the sensing head on the complex condition of stray magnetic field.