Substation automation with redundant protection

The invention claims a transformer substation automation sar in the interval of the protection backup redundancy concept it can prevent sa system of single faults intelligent electronic device ied damage of transformer substation interval operation. Form on the assigned to the electric power system of transformer substation by the local or the master control the interval between the protection of ied performs the assignment the protection ied the distance between the function of protecting p20 and its adjacent interval during at least one of the protection function of the p10. So each compartment can be composed of two different protection ied to manage the redundancy in a software level and it is not realize the hardware level there is no need to each interval the invention claims special for redundant protection ied. When the need of such as when the protection ied from the sensor received from the adjacent intervals of a process of state or relevant to value information represents adjacent interval calculating or operating such as over current the voltage or ground fault and protective function and send out the aiming at the adjacent interval executing mechanism of the command.