Studies of Rogowski coil current transducer for low amplitude current (100A) measurement

Measuring current of less than 1000 A is usually called low amplitude current measurement in the world when we use a Rogowski coil for the measurement of current. The voltage induced in the coil is very small and easily disturbed when measured current is less than 100 A. This paper introduces a method to measure current of less than 100 A with circuit dispose, offering its basic theory, realization and frequency response. A test result of Rogowski current transducer whose rated current is 100 A is given in the end. It proves that the precision reaches 0.2 grades. This method is valid when measured current is less than 100 A even in the situation of only several amperes.