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Quantitative Evaluation of the Impact of Low-Voltage Loads due to Repetitive Voltage Sags  

Yun Sang-Yun (Electrotechnology R&D Center, LS Industrial Systems)
Kim Jae-Chul (Dept. of Electrical Engineering, Soongsil University)
Moon Jong-Fil (Power System Research Division, KESRI)
Kang Bong-Seok (Dept. of New & Renewable Energy, KEMCO)
Publication Information
KIEE International Transactions on Power Engineering / v.5A, no.3, 2005 , pp. 293-299 More about this Journal
Abstract
Automatic reclosing is a typical protection method in power distribution systems for the clearing of temporary faults. However, it has a fatal weakness in regards to voltage sags because it produces repetitive voltage sags. In this paper, we explored the repetitive impact of voltage sag due to the automatic reclosing of power distribution systems. The actual tests of low voltage loads were carried out for obtaining the susceptibility of voltage sags. The final results of the tests yielded power acceptability curves of voltage sag, and the curves transformed the 3-dimensional CBEMA (Computer Business Equipment Manufacturer Association) format. For the quantitative evaluation of the impact of repetitive voltage sags, an assessment formulation using the voltage sag contour was proposed. The proposed formulation was tested by using the voltage sag contour data of IEEE standard and the results of the test. Through the case studies, we verified that the proposed method can be effectively used to evaluate the actual impact of repetitive voltage sags.
Keywords
Automatic reclosing; power acceptability curve; power quality; repetitive voltage sags; voltage sag contour;
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