Recent blackouts of major power systems (PSs) clearly demonstrate the topicality of the blackout problem. Detailed analysis of blackouts allows to conclude that there is a long list of dangerous incidents that under unfavourable conditions lead to rapid shutdown of significant number of vital power system elements: power plants, power lines, transformers and consumers. Power supply of vast geographical regions can be broken. To prevent such situations special types of automation are employed. In particular, for prevention and elimination of generators asynchronous operation mode automatic devices controlling the angles between two simulated voltages can be applied. Dangerous mode of operation can be eliminated using the short-term splitting of power system, followed by automatic restoration to normal operating conditions. To restore normal operation under-frequency load shedding automation widely is used. The use of these types of automation transform severe emergency into a short transient process. To implement named automation GPS and fiber optic communication channels can be used. The main problems of devices realization, application and testing are discussed.