positive-phase-sequence component ammeter

Based on the phase variation of positive-sequence component of current in distribution network,a directional over-current protection scheme is proposed.

文章基于配电网电流正序分量相位的变化,提出一种方向过流保护方案,该方案首先利用故障前一周期和故障后一周期的电流正序分量相角差判定故障方向,然后通过比较三相电流绝对值间隔0。