Design of Overhead Line Electromagnetic Measurement Sensor Based on Reverse String Air-core Coil
Power grid staffs often work in live facilities with electric shock accidents occurring frequently,and appropriate electric field measurement and safety warning devices are urgently needed.According to such requirements,a new sensor based on air-core coil is designed to provide a new solution for electric field measurement under actual complex working conditions.In this paper,the law of current on transmission wire and magnetic field intensity near it and the measurement principle of reverse series structure are first studied,and optimal design of the sensor under differential working state is obtained by combining the appropriate integration circuit.Then according to the inversion law of electric field measure-ment,an air-core coil type high-frequency current sensor is designed.Finally by analyzing steady-state and dynamic re-sponse performance of the air core coil sensor,it is successfully verified that the designed air-core coil sensor has a wide frequency band and a large measurement range,can effectively tolerate interference of external magnetic field,and achieve transient and steady-state response performance that satisfies actual needs.