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JEET, Vol. 12, No. 4, July 2017
Estimation of Voltage Swell Frequency Caused by Asymmetrical Faults
Chang-Hyun Park
Area A - Electric Power Engineering
Abstract This paper proposes a method for estimating the expected frequency of voltage swells caused by asymmetrical faults in a power system. Although voltage swell is less common than voltage sag, repeated swells can have severe destructive impact on sensitive equipment. It is essential to understand system performance related to voltage swells for finding optimal countermeasures. An expected swell frequency at a sensitive load terminal can be estimated based on the concept of an area of vulnerability (AOV) and long-term system fault data. This paper describes an effective method for calculating an AOV to voltage swells. Interval estimation for an expected swell frequency is also presented for effective understanding of system performance. The proposed method provides longterm performance evaluation of the frequency and degree of voltage swell occurrences.
Keyword Asymmetrical faults,Interval estimation,Power quality,Single line to ground fault,Voltage swells
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