Analysis on incomplete current differential microcomputer protection for medium and low voltage busbar

Aiming at the features of medium and low voltage busbar system,the difficulties in implementation of busbar protection for this system were analyzed.The differences between the complete current differential protection scheme and the incomplete current differential protection scheme were analyzed and compared.Based on data acquisition and transformation through the analog channel of each protection device,the protection configuration,algorism selection and setting calculation were carried out respectively;and a complete solution for incomplete current differential protection was put forward.