Due to the limitation of the manufacturing process

the measuring precision of the coil is easily affected by the external magnetic field.A new Rogowski coil magnetic shielding box is designed based on Rogowski coil working principle and analysis of magnetic interference.Under the laboratory environment

using full-shielding box and semi-shielding box normal signal decay test

simulation of inter phase power line interference test and core vibration interference test.At the same time

add a shielding box has significantly enhanced the ability of anti-magnetic interference.Designing the magnetic shielding box modeling in Ansys Maxwell finite element simulation

analyzing the effect which considering material of shielding box

semi-shielding

full-shielding box of normal signal acquisition and anti-magnetic interference.The results showed that:in normal signal acquisition

input and output ratio of nonshielding box is higher in low frequency current operating conditions

and whether add shielding box has little influence in the condition of high frequency current.The simulation results show that full-shielding box has better performance

magnetic shielding box using silicon steel material will further enhance the ability to obtain the normal signal.The magnetic shielding box designed in this paper can be used in the measurement of high frequency current

and can choose the full and half shielding box according to the external magnetic interference

and effectively improve the measurement accuracy of the Roche coil.