load interactive power flow management in a remote substation

A transformer supplying power is the main transformer and an auxiliary transformer is connected for load sharing. Transformers are operated in parallel to share excessive load on one transformer. In this work a design is proposed to use one transformer as main transformer and the other one as auxiliary transformer.
The first stage of this project, if the main transformer, which is in operation, is overloaded for a period specified by standards, then the auxiliary transformer will be automatically switched on to share the load on main transformer. Whenever the load is reduced within the capacity of main transformer then only the main transformer will be operated and the auxiliary transformer will go to standby mode.
The second stage of this project, the loads are distinguished as critical and non critical loads. The critical loads are further classified as critical and most critical loads. When there is a sudden shut down of auxiliary transformer due to fault or maintenance during peak load condition, there will be supply of power only to the most critical loads.

all these are to be done using a micro-controller. can anyone help me out, regarding logic and coding of micro-controller please?