FIELD: electric power industry.
SUBSTANCE: invention is used in the electric power industry in emergency control devices to determine the asynchronous mode before its actual start. According to the method, according to the values of the angle between the voltage vectors along the boundaries of the protected area, its derivative and the derivative of active power, the possibility of starting an asynchronous run with a time delay is determined, which is determined based on the estimated time before the start of the asynchronous mode and is limited from below by the value determined from the conditions of the transient process.
EFFECT: elimination of asynchronous mode, termination of the development of an emergency process.
1 cl, 3 dwg
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