Reasearch on the adaptive backup power switchover unit

Aiming at the problem of backup power switchover unit currently used,the method of judging exist of interconnecting breaker and properly using the external protection closedown is put forward by analyzing the characteristics of the main buses in the grid.Two action logic of power switchover unit are designed,which are devided into power breaker and interconnecting breaker.The new logic resolves all kinds of problems of previous unit in use. In the end,the user’s notice of new backup power switchover unit is also introduced.