Design of a newfashioned high precision electronic current transducer

The electric current transducer plays a significant role in electric power system. In order to measure small current accurately, a newfashioned high precision electronic current transducer was designed. A novel high mutual inductance, high precision Rogowski coil was adopted as sensor head, and a novel analog signal process system, including magnifying, filtering, phase compensating was designed to improve precision and reduce power dissipation. Besides, the application of CPLD technique harmonized the system. High precision components improved the precision of transducer. By experimentation we drew a conclusion that this system worked steadily at the range of -40~70°C, and it´s precision could meet 0.2 level of international criterion.