Measures, such as the floating of threshold, braking by positive sequence current, driving up the threshold during power swing, etc are suggested to prevent th.

采用浮动门槛、正序电流制动和静稳破坏后提高动作门槛值的方法，来防止系统振荡时误启动。

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These disadvantages could be eliminated in three-phase systems if the energy account based on the integral of the active power of the positive sequence component with the fundamental harmonic.

在三相系统中，以正序基波功率的积分作为计量标准，同样可以消除这两方面的不利影响。

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