| 词条 | Voltage sag |
| 释义 |
A voltage sag (U.S. English) or voltage dip[1] (British English) is a short duration reduction in rms voltage which can be caused by a short circuit, overload or starting of electric motors.[2] A voltage sag happens when the rms voltage decreases between 10 and 90 percent of nominal voltage for one-half cycle to one minute.[2][3] Some references defines the duration of a sag for a period of 0.5 cycle to a few seconds,[5][4] and longer duration of low voltage would be called a "sustained sag".[5] Related notionsThe term "sag" should not be confused with brownout which is the reduction of voltage for minutes or hours.[6] The term "transient" as used in power quality is an umbrella term and can refer to sags, but also to swells, dropouts, etc.[7] SwellVoltage swell is the opposite of voltage sag. Voltage swell, which is a momentary increase in voltage, happens when a heavy load turns off in a power system.[8]See also
CausesThere are several factors which cause a voltage sag to happen:
References1. ^{{cite web | title=IEEE 493-2007 - IEEE Recommended Practice for the Design of Reliable Industrial and Commercial Power Systems | website=The IEEE Standards Association | date=2007-02-12 | url=https://standards.ieee.org/findstds/standard/493-2007.html | access-date=2018-01-09}} 2. ^1 2 3 {{cite book|last=Bollen|first=Math H.J.|title=Solving power quality problems : voltage sags and interruptions|year=1999|publisher=IEEE Press|location=New York|isbn=978-0-7803-4713-7|page=139}} 3. ^{{cite web|title=Industrial Voltage Regulator Power Conditioner|url=http://www.ustpower.com/Support/SupportKnowledgeBase/KnowledgeBasePowerQualityProblems/Sag_Dip.aspx|publisher=Utility Systems Technologies|accessdate=25 September 2013}} 4. ^1 {{cite book|title=Grid Converters for Photovoltaic and Wind Power Systems|year=2011|publisher=Wiley-IEEE Press|isbn=978-1-119-95720-1|author1=Remus Teodorescu |author2=Marco Liserre |author3=Pedro Rodríguez }} 5. ^1 {{cite book|title=Practical grounding, bonding, shielding and surge protection.|year=2004|publisher=Newnes|location=Oxford|isbn=978-0-08-048018-3|page=134|author=Vijayaraghavan, G, Mark Brown and Malcolm Barnes}} 6. ^{{cite book|last=Standler|first=Ronald B.|title=Protection of electronic circuits from overvoltages|year=1989|publisher=Wiley|location=New York|isbn=9780471611219|page=40}} 7. ^{{cite book|author1=R. Sastry Vedam|author2=Mulukutla S. Sarma|title=Power Quality: VAR Compensation in Power Systems|year=2008|publisher=CRC Press|isbn=978-1-4200-6482-7|pages=4–5 and 23}} 8. ^1 2 3 4 {{cite book|last=Kazibwe|first=Wilson E.|title=Electric power quality control techniques|year=1993|publisher=Van Nostrand Reinhold|location=New York|isbn=978-0-442-01093-5|page=11|author2=Sendaula, Musoke H. }} 2 : Voltage stability|Power engineering |
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