Nearly 90% of all power quality problems are voltage sags and momentary outages.

在所有的电力质量问题中，几乎90%为电压降落与瞬间停电。

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Harmonic frequencies in the power grid are a frequent cause of power quality problems.

谐波频率在电网中是造成电能质量问题的常见原因。

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In various power quality problems voltage sags are the worst dynamic power quality problems.

在各种电能质量问题中，电压跌落是危害最严重的动态电能质量问题。

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More than one third of all business downtime results from power quality problems, according to Electric Light and Power magazine.

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Toughness--a combination of quality, durability and all-around staying power--is increasingly important to consumers anxious about credit problems and potential job loss, says Raffi Festekjian, senior manager of product research and analysis at J.

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