Electronic current transformer used for small current measurement problems

With the power system transmission capacity and voltage level continues to increase, traditional electromagnetic current transformer weaknesses exposed more and more difficult to meet the power to automate and digitize the direction of development needs. In recent years, electronic current transformers study researchers got  mcb circuit breaker  attention at home and abroad, has become a revolutionary research direction. Focus on the current sensor head, electronic current transformer is used to solve a small current measurement problem. First, an overview of  air circuit breaker  current transformers study the significance of electronic current transformers at home and abroad research situation; various currents of the current sensor head were studied, analyzed the respective deficiencies; According to the electromagnetic theory the hollow coil made ​​improvements and innovations made ​​hollow spiral coil as electronic current transformer sensor head, the two structures are given spiral hollow coil - hand around long straight hollow spiral coil and PCB planar spiral hollow coil;