FIELD: electrical engineering: automatic emergency control facilities of power systems. SUBSTANCE: active power of synchronous load is measured, pre-accident value of active power is stored, its maximum value during accident is recorded, permissible slip of synchronous machine rotor is determined by current parameters, current slip is measured, and if it equals or exceeds permissible value, emergency condition of synchronous load is recorded as unsteady condition, and signal is shaped for reducing its power. EFFECT: improved reliability of accident control. 3 dwg, 1 tbl
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