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Energies 2017, 10(3), 401; doi:10.3390/en10030401

Methodology for Determination of the Number of Equipment Malfunctions Due to Voltage Sags

Faculty of Electrical Engineering, Department of Power Electrical Systems, University of Zilina, Univerzitna 1, 010 26 Zilina, Slovakia
The Electricity Distribution Company, Pri Rajcianke 2927/8, 010 47 Zilina, Slovakia
Author to whom correspondence should be addressed.
Academic Editor: Rodolfo Araneo
Received: 15 February 2017 / Revised: 14 March 2017 / Accepted: 15 March 2017 / Published: 20 March 2017


This article deals with the assessment of the reliability of sensitive equipment due to voltage sags. The most frequent problems of power quality are voltage sags. Equipment that cannot withstand short-term voltage sag is defined as sensitive device. Sensitivity of such equipment can be described by the voltage–tolerance curves. A device (generator) to generate voltage sags (also interruptions) with duration at least 1 ms has been designed and developed for this purpose. Equipment sensitive to voltage sags was tested using this generator. Overall, five types of sensitive equipment were tested: personal computers, fluorescent lamps, drives with speed control, programmable logic controllers, and contactors. The measured sensitivity curves of these devices have been used to determine the number of trips (failures) due to voltage sags. Two probabilistic methods (general probability method and cumulative probability method) to determine probability of equipment failure occurrence are used. These methods were applied to real node in the distribution system with its actual performance of voltage sags/swells. The calculations also contain different levels of sensitivity of the sensitive equipment. View Full-Text
Keywords: power quality; voltage sag; sensitivity of equipment; probability of equipment trip power quality; voltage sag; sensitivity of equipment; probability of equipment trip

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Otcenasova, A.; Bodnar, R.; Regula, M.; Hoger, M.; Repak, M. Methodology for Determination of the Number of Equipment Malfunctions Due to Voltage Sags. Energies 2017, 10, 401.

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