Methods and systems for monitoring a grid control system

A detection device (160) for monitoring at least one message transmitted between components included within a grid control system (100) is provided. The detection device includes a memory device (310) configured to store a rationality database (350) that includes at least one rule (352), and a processor (315) coupled to the memory device and configured to receive the at least one message and to compare the at least one message with the at least one rule to determine a rationality of the at least one message.