Existing sensing technologies for low-voltage distribution terminal loads suffer from shortcomings such as narrow measurement frequency band

low accuracy of split-core type

and poor anti-interference ability.To address these issues

a high-precision split-core current sensor for real-time and accurate sensing of terminal load current is developed.A tunneling magnetoresistance(TMR)effect magnetic sensor is employed as the basic element.An anti-interference design method for a flux-concentrating core based on a dual-gap structure is investigated

and a low-power consumption design scheme using unilateral winding is proposed.The developed sensor is applied in smart power supply terminal monitoring scenarios during the Chengdu World Games.The results show that 1)the dual-gap structure significantly suppresses external magnetic interference

reducing a 5Oe interference magnetic field to 0.064Oe in the sensitive axis;2)the basic error of the sensor is better than within ±0.5% and the linearity error is better than 0.1%;3)it enables real-time monitoring and alarm for current overload

helping timely eliminate potential defects and hidden dangers in key power protection circuits.This study holds great significance for realizing real-time state perception and fault early warning in low-voltage distribution networks

and for empowering smart operation and maintenance.