Several blackout catastrophes of large power network occurred abroad in recent years, which increased the extent of im-portance attached to the safe and reliable operation of power network.
由于世界范围内发生的几起大电网停电事故，增加了对电网安全可靠运行的重视。
The blackout frequency can be effectively reduced by strengthening the construction of transmission lines, and then risk of system operation can also be reduced.
加强传输线路的建设可以有效减少停电频率，进而降低系统的运行风险；
As an example, the operation frequency of TT&C and data transmission(TTC&DT) and the attenuation constant of electromagnetic wave through the blackout zone are estimated.
作为一次练习，估算了测控通信系统的工作频率、电波穿过“黑障”区的衰减常数；
As an example, the operation frequency of TT&C and data transmission(TTC&DT) and the attenuation constant of electromagnetic wave through the blackout zone are estimated.
作为一次练习，估算了测控通信系统的工作频率、电波穿过“黑障”区的衰减常数；
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