This paper analyzes the present applications of low voltage bus protection

and presents a new solution of simplified bus protection. Based on the characteristics of low voltage bus topology

the bus unit module is abstracted. Each bus unit module calculates the overcurrent condition of its incoming line and bus section by using the overcurrent of the other bus unit modules. By referring to the blocking signals from the outgoing line protection

selective tripping of weak power

incoming line or bus section is realized and fast fault clearing achieved.