a Abstract:Today's power systems have become so complex that it is not easy for the system dispatcher to realistically predict the results of outages. The situation is compounded whenever the power grid is not in its "normal" configuration due to that will help them train their dispatcher to:"planning studies" almost useless since they were based on a specific configuration of the power system, generators and the grid equipment.As a result of the reasons mentioned above, utilities need tools maintenance switching or equipment failure. The authors feel that the DTS is an excellent tool that can be used to teach the dispatcher how to react under these conditions. * Perform their normal tasks better. This can be accomplished through:Hands-on repetitive practice + Re-enforcement of operational procedures Know how their system would react if some emergency occurs on the power system. Some of the objectives here are: + In this paper, the authors present an on-line implementation of the DTS which allows the user to 0 initialize the DTS to an EMS disturbance using data that was captured at the time of the disturbance; and place the DTS in a playback mode and go back to specific times in the scenario. 0 How to detect if an emergency has occurredHow t o get the power system out of the emergency situation How to prevent an emergency from occurringThe former feature allows the analyst to investigate EMS disturbances and then train the various dispatchers to be able to recognize such disturbances and to recover from them when ---they occur. The latter feature allows the instructor (with the trainee) to review and re-experience desired portions of the scenario.The authors feel that the DTS is an excellent training tool to help the dispatcher achieve these objectives.It is the authors' feeling that these two features will help the EMS operational staff understand their power system better and help their dispatchers in dealing with operational problems associated with the proper running of the system.