The disconnection from power network of power plants under emergency conditions may cause serious frequency drop and then large area outage, even power network collapse.

在突然恶性事故情况下，由于发电厂的退出，电力系统有可能产生严重的频率下降，导致系统崩溃和大面积停电事故。

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However, the danger of frequency collapse always exists, and has a great impact for power system running.

但是，频率崩溃的危险是始终存在的，并对电力系统的安全稳定运行造成了很大的影响。

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Under malignant emergency conditions, the frequency of power system seriously and consequently drops down which lead, system to collapse and a large area outage.

在突然恶性事故情况下，电力系统产生严重的频率下降，导致系统崩溃和大面积停电。

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The minister said the exact reason for the collapse had not yet been pinpointed but, in the summer, "states try to take more power from the grid" and at the time of the collapse, the grid frequency was "above normal".

BBC: Power cut causes major disruption in northern India