Solving sensor’s phase difference is essential for improving the precision of electronic current transformer.In order to reduce the sensor’s phase difference

according to the characteristic of Rogowski coil and subsequent disposal circuit

this paper analyzed and calculated the phase difference of sensor.Then

reasonable circuit compensating the phase difference was designed.At last the test result was presented.The result indicates that the phase compensation circuit could compensate entirely the phase difference induced by sensor.So as to

the precision of current transformer could be improved to 0.2 level.