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An efficient method to include the effect of radial feeders on optimal coordination of directional overcurrent protections

机译:一种有效的方法,包括径向馈线对方向过电流保护的最佳协调的影响

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摘要

This short article shows an efficient way to include the effect of coordination with radial feeders on the optimal coordination of directional overcurrent protections. This effect can be important, but it has been seldom considered. The proposed method is based on the inclusion of constraints related to coordination with radial feeders as simple increments of lower limits of the time multiplier settings of upstream directional protections. Although the overcurrent protections of radial feeders usually have inverse-type curves, the fault currents for the coordination are known and, consequently, their operation times can be directly computed. Therefore, these known operation times can be simply summed to the time margin required for selectivity, in order to compute the lower limits of time multiplier settings of upstream directional protections. The main advantage of the proposed method is the avoiding of increments in the number of constraints of the optimization problem.
机译:本简短的文章显示了一种有效的方法,包括与径向馈线的协调效果,以在方向过电流保护的最佳协调上。这种效力可能很重要,但它很少考虑。所提出的方法基于包含与径向馈线的协调相关的约束,作为上游定向保护的时间乘数设置的下限的简单增量。尽管径向馈线的过电流保护通常具有逆型曲线,但是为协调的故障电流是已知的并且因此,可以直接计算它们的操作时间。因此,可以简单地将这些已知的操作时间汇总到选择性所需的时间裕度,以计算上游方向保护的时间乘数设置的较低限制。所提出的方法的主要优点是避免在优化问题的约束数量中的增量。

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