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Yuan Jixiu North China Electric Power Design Institute Beijing, 100011 China  
The emergency control for preventing widespread blackout, i.e., the third line of defence, under extremely severe disturbance of power system is discussed in this paper. The necessity of the third line of defence is emphasized although the probability of extremely severe disturbance is very low. It would not be adopted measures against certain specific severe disturbances in stead of the third line of defence. The third line of defence cannot be directed against all severe disturbances one by one whereas would be directed against the emergency state and abnormal parameters resulted by any severe disturbance. The principle and feature of the main functions of the third line of defence (i.e., breaking off out of step state, preventing voltage and frequency collapse, preventing cascade tripping) are briefly presented.
【CateGory Index】: TM712
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