underfrequency relay 低频继电器
underfrequency pc card 低于额定频率百分数卡
underfrequency card 频率过低卡
underfrequency rela 欠频继电器
Underfrequency Load Shedding (UFLS), which is the third defensive line of power system, is one of effective methods to mitigate the frequency collapses.
低频减负荷（UFLS）作为电力系统的第三道防线，是一种防止系统频率崩溃的有效手段。
Underfrequency load shedding (UFLS) is a widely accepted effective measure to repress further frequency drop. Most of UFLS schemes use pre specified steps based on measured frequency to shed load.
低频减载(UFLS)无疑是一种抑制频率下降的有效方法，它依据测量到的频率值，按轮次分步骤地减掉负荷。
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