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voltage sag
A voltage sag (U.S. English) or voltage dip (British English) is a short duration reduction in rms voltage which can be caused by a short circuit, overload or starting of electric motors.
A voltage sag happens when the rms voltage decreases between 10 and 90 percent of nominal voltage for one-half cycle to one minute.〔〔(【引用サイトリンク】url=http://www.ustpower.com/Support/SupportKnowledgeBase/KnowledgeBasePowerQualityProblems/Sag_Dip.aspx )〕 Some references defines the duration of a sag for a period of 0.5 cycle to a few seconds,〔 and longer duration of low voltage would be called a "sustained sag".
==Related notions==
The term "sag" should not be confused with brownout which is the reduction of voltage for minutes or hours.
The term "transient" as used in power quality is an umbrella term and can refer to sags, but also to swells, dropouts etc.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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