Design of a Self-powered Current Measuring Sensor
Changfu Xu, Shuo Zhang, Tao Tao, Chengbo Hu, Jiayuan Xu, Xin Zhou, Hong Yu · 2017
Current measurement is one of the most important work in online monitoring of the electric system.Self-powered and intelligence are key areas of the current measuring sensor.In this paper, a self-powered current measuring sensor was designed, which realizes synchronous measurement and power supply by one current transformer (CT).The mathematical relationship between the primary side current, secondary side voltage and current of the CT were deduced.The model for line current measurement based on voltage and current signals was constructed, and the overall design of the current measuring equipment was given.Finally, the accuracy of measuring models was verified by experiments.