Research Of The Rogowski Coil Applied In Pulsed High Magnetic Field

The accuracy of current transformer is affected by pulsed high magnetic field, especially when the magnetic flux density is higher and higher with the development of pulsed power technology. After comparing the common pulsed current measurement methods, the Rogowski coil is chosen as the current sensor. Research and design of the structure of the coil has been studied to weaken the magnetic interference.To meet the requirement of uniformity, Rogowski coil with the structure of the printed circuit board is chosen as the research subject. On the basis of predecessors' research work, the principle of the measurement of pulsed current with Rogowski coil is analyzed, and the work status of the coil is determined. Then, combined with the simulation and experiment, the parameters which influence the dynamic characteristics of Rogowski coil and the position error are investigated. And refering to the characteristics of the pulsed current, the principle that how to design the parameters of the coil is determined. The paper is mainly focused on how to weaken the influence of magnetic field on the accuracy of Rogowski coil. The interference magnetic field in the vertical or horizontal direction will cause measurement error to the coil. To find out the relationship between the error and the structure parameters of different coil, a series of analysis simulation are finished. At the same time, the anti-magnetic interference mechanism of different types is studied. Combined with the advantages of even-layer coil and planar PCB coil, the paper puts forward a new type of coil and names it as bi-direction PCB coil. Finally, summarizing theoretical study and simulation analysis, this two types of PCB Rogowski coil are designed with similar parameters, then their performance such as linearity and anti-magnetic interference capability are tested comprehensively. The structure of planar PCB coil is improved and the parameters of both coils are optimized on the basis of experimental results. The experimental results meet the pulsed current measurement standard.Theoretical analysis and experimental tests shows that, the analysis method proposed in this paper is effective. Two types of Rogowski coil perform well in high magnetic field environment, which are in principle value.