Study On Several Problems Of Rogowski Coil

As a new type of current transducer, Rogowski coil has the advantage of electrical insulation, wide frequency width, fast response, small size and high precision measurement. And it is widely used in electrical measurement. According to the problems raised by a Rogowski coil manufacture enterprise, this thesis studied several problems which affect the precision.This thesis introduced a variety of current transducers which include Rogowski coil, analyzed and introduced the measurement principles and characteristics. This thesis also introduced the development status at home and abroad. This thesis theoretically analyzed the operating characteristics of Rogowski coil, equivalent circuit, work status, and frequency characteristics in emphasis. This thesis detailed analyzed of the new Rogowski coil:PCB Rogowski coil, and studied its principles, design and manufacturing technique.This thesis mainly analyzed the factors that caused the error Rogowski coil: electromagnetic interference, temperature changes, and the conduct wire misalignment. This thesis has done some theoretical analysis of electromagnetic interference on the Rogowski coil and electromagnetic shielding. And made analysis of temperature changes and positional deviation and simulated them by using Ansoft software. The Rogowski coil mutual inductance which affected by these two factors has been calculated. Compared simulation results to theory, a method is given to reduce the error. We should select skeleton material of low temperature expansion efficient, because temperature changes are proportional to the mutual inductance. For wire position deviation, with deviation from the center of the coil, the mutual inductance decreases, we should make the wire in the center of the coil to reduce errors.At the end of this thesis, a summary and prospect was made, and the shortcomings of this thesis and the direction of further study are given.