Developing of power frequency leakage current sensor for high voltage equipment based on Rogowski coil

Three different current sensors used in the leakage current measurement of high voltage electrical equipments are studied.The Rogowski coil is selected to measure the power frequency leakage current.Based on the behaviors of Rogowski coil external integration circuit,a Rogowski coil sensor to measure the micro-power frequency leakage current is made.The behaviors of the designed Rogowski coil sensor are tested.The actual leakage current is measured.The results show that the coil is effective.