During on-line live measurement of MOA

it is difficult to measure the resistive current accurately because of the interphase interference. In this paper

the three-phase MOA on a 220 kV transmission line in different phase sequence is analyzed to investigate the interphase interference. The self-capacitance and mutual capacitance of the MOA are obtained by establishing and calculating an elaborate 3D model based on the finite element method

and both capacitance values are substituted into the resistance-capacitance network established in EMTPATP to complete simulation and calculation. Then the total current

resistive current and difference of phase angle with or without the interphase interference can be obtained. Through comparison

the interphase interference can be effectively filtered

thus improving the accuracy of resistive current monitoring. Comparative analysis shows that the effect of the interphase interference on resistive current relates to the MOA phase sequence

and asymmetry of three-phase arrangement will result in instability of interphase interference effect.