With the evolution of smart grids towards high-proportion renewable energy integration

wide-frequency-band current accurate detection in overhead transmission lines has become a critical technological requirement for situational awareness in new power systems.Aiming at the technical bottleneck of traditional electromagnetic current transformers being limited by the frequency response characteristics of iron core materials

which makes it difficult to achieve accurate transformation of high-frequency currents at the kHz level

this study focuses on the accuracy improvement of non-contact measurement methods. Although existing current sensors based on the tunneling magnetoresistance(TMR) effect exhibit advantages in wideband measurement

their decoupling calculations for three-phase current detection in overhead lines are significantly affected by spatial displacement disturbances caused by overhead line galloping.A multi-physical quantity fusion measurement method is proposed to address these challenges. First

a TMR current sensor array is employed to perform decoupled measurements of three-phase current in overhead lines under ideal static conditions

followed by an analysis of measurement errors induced by conductor displacement.Subsequently

an improved three-phase current measurement method for overhead lines using micro electro mechanical systems(MEMS)acceleration sensors is proposed.By fusing TMR current sensors with MEMS acceleration sensors

this approach simultaneously measures three-phase current while utilizing MEMS acceleration sensors to monitor real-time conductor motion postures and synchronously correcting the three-phase current decoupling equations

ultimately achieving precise three-phase current measurement of overhead lines in complex environments.